VMware vSphere Integrated Containers provider (#206)

* Add Virtual Kubelet provider for VIC

Initial virtual kubelet provider for VMware VIC.  This provider currently
handles creating and starting of a pod VM via the VIC portlayer and persona
server.  Image store handling via the VIC persona server.  This provider
currently requires the feature/wolfpack branch of VIC.

* Added pod stop and delete.  Also added node capacity.

Added the ability to stop and delete pod VMs via VIC.  Also retrieve
node capacity information from the VCH.

* Cleanup and readme file

Some file clean up and added a Readme.md markdown file for the VIC
provider.

* Cleaned up errors, added function comments, moved operation code

1. Cleaned up error handling.  Set standard for creating errors.
2. Added method prototype comments for all interface functions.
3. Moved PodCreator, PodStarter, PodStopper, and PodDeleter to a new folder.

* Add mocking code and unit tests for podcache, podcreator, and podstarter

Used the unit test framework used in VIC to handle assertions in the provider's
unit test.  Mocking code generated using OSS project mockery, which is compatible
with the testify assertion framework.

* Vendored packages for the VIC provider

Requires feature/wolfpack branch of VIC and a few specific commit sha of
projects used within VIC.

* Implementation of POD Stopper and Deleter unit tests (#4)

* Updated files for initial PR

vendor/github.com/godbus/dbus/.travis.yml

@@ -0,0 +1,40 @@
+dist: precise
+language: go
+go_import_path: github.com/godbus/dbus
+sudo: true
+
+go:
+  - 1.6.3
+  - 1.7.3
+  - tip
+
+env:
+  global:
+  matrix:
+   - TARGET=amd64
+   - TARGET=arm64
+   - TARGET=arm
+   - TARGET=386
+   - TARGET=ppc64le
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
+  exclude:
+  - go: tip
+    env: TARGET=arm
+  - go: tip
+    env: TARGET=arm64
+  - go: tip
+    env: TARGET=386
+  - go: tip
+    env: TARGET=ppc64le
+
+addons:
+  apt:
+    packages:
+    - dbus
+    - dbus-x11
+
+before_install:

vendor/github.com/godbus/dbus/CONTRIBUTING.md

@@ -0,0 +1,50 @@
+# How to Contribute
+
+## Getting Started
+
+- Fork the repository on GitHub
+- Read the [README](README.markdown) for build and test instructions
+- Play with the project, submit bugs, submit patches!
+
+## Contribution Flow
+
+This is a rough outline of what a contributor's workflow looks like:
+
+- Create a topic branch from where you want to base your work (usually master).
+- Make commits of logical units.
+- Make sure your commit messages are in the proper format (see below).
+- Push your changes to a topic branch in your fork of the repository.
+- Make sure the tests pass, and add any new tests as appropriate.
+- Submit a pull request to the original repository.
+
+Thanks for your contributions!
+
+### Format of the Commit Message
+
+We follow a rough convention for commit messages that is designed to answer two
+questions: what changed and why. The subject line should feature the what and
+the body of the commit should describe the why.
+
+```
+scripts: add the test-cluster command
+
+this uses tmux to setup a test cluster that you can easily kill and
+start for debugging.
+
+Fixes #38
+```
+
+The format can be described more formally as follows:
+
+```
+<subsystem>: <what changed>
+<BLANK LINE>
+<why this change was made>
+<BLANK LINE>
+<footer>
+```
+
+The first line is the subject and should be no longer than 70 characters, the
+second line is always blank, and other lines should be wrapped at 80 characters.
+This allows the message to be easier to read on GitHub as well as in various
+git tools.

vendor/github.com/godbus/dbus/LICENSE

@@ -0,0 +1,25 @@
+Copyright (c) 2013, Georg Reinke (<guelfey at gmail dot com>), Google
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/godbus/dbus/MAINTAINERS

@@ -0,0 +1,3 @@
+Brandon Philips <brandon@ifup.org> (@philips)
+Brian Waldon <brian@waldon.cc> (@bcwaldon)
+John Southworth <jsouthwo@brocade.com> (@jsouthworth)

vendor/github.com/godbus/dbus/README.markdown

@@ -0,0 +1,44 @@
+[![Build Status](https://travis-ci.org/godbus/dbus.svg?branch=master)](https://travis-ci.org/godbus/dbus)
+
+dbus
+----
+
+dbus is a simple library that implements native Go client bindings for the
+D-Bus message bus system.
+
+### Features
+
+* Complete native implementation of the D-Bus message protocol
+* Go-like API (channels for signals / asynchronous method calls, Goroutine-safe connections)
+* Subpackages that help with the introspection / property interfaces
+
+### Installation
+
+This packages requires Go 1.1. If you installed it and set up your GOPATH, just run:
+
+```
+go get github.com/godbus/dbus
+```
+
+If you want to use the subpackages, you can install them the same way.
+
+### Usage
+
+The complete package documentation and some simple examples are available at
+[godoc.org](http://godoc.org/github.com/godbus/dbus). Also, the
+[_examples](https://github.com/godbus/dbus/tree/master/_examples) directory
+gives a short overview over the basic usage. 
+
+#### Projects using godbus
+- [notify](https://github.com/esiqveland/notify) provides desktop notifications over dbus into a library.
+- [go-bluetooth](https://github.com/muka/go-bluetooth) provides a bluetooth client over bluez dbus API.
+
+Please note that the API is considered unstable for now and may change without
+further notice.
+
+### License
+
+go.dbus is available under the Simplified BSD License; see LICENSE for the full
+text.
+
+Nearly all of the credit for this library goes to github.com/guelfey/go.dbus.

vendor/github.com/godbus/dbus/_examples/bluetooth_introspect.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/godbus/dbus"
+)
+
+func main() {
+	conn, err := dbus.SystemBus()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to connect to SystemBus bus:", err)
+		os.Exit(1)
+	}
+
+	var s string
+	err = conn.Object("org.bluez", "/").Call("org.freedesktop.DBus.Introspectable.Introspect", 0).Store(&s)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to introspect bluez", err)
+		os.Exit(1)
+	}
+
+	fmt.Println(s)
+}

vendor/github.com/godbus/dbus/_examples/eavesdrop.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"github.com/godbus/dbus"
+	"os"
+)
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to connect to session bus:", err)
+		os.Exit(1)
+	}
+
+	for _, v := range []string{"method_call", "method_return", "error", "signal"} {
+		call := conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
+			"eavesdrop='true',type='"+v+"'")
+		if call.Err != nil {
+			fmt.Fprintln(os.Stderr, "Failed to add match:", call.Err)
+			os.Exit(1)
+		}
+	}
+	c := make(chan *dbus.Message, 10)
+	conn.Eavesdrop(c)
+	fmt.Println("Listening for everything")
+	for v := range c {
+		fmt.Println(v)
+	}
+}

vendor/github.com/godbus/dbus/_examples/introspect.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"encoding/json"
+	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/introspect"
+	"os"
+)
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		panic(err)
+	}
+	node, err := introspect.Call(conn.Object("org.freedesktop.DBus", "/org/freedesktop/DBus"))
+	if err != nil {
+		panic(err)
+	}
+	data, _ := json.MarshalIndent(node, "", "    ")
+	os.Stdout.Write(data)
+}

vendor/github.com/godbus/dbus/_examples/list-names.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"github.com/godbus/dbus"
+	"os"
+)
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to connect to session bus:", err)
+		os.Exit(1)
+	}
+
+	var s []string
+	err = conn.BusObject().Call("org.freedesktop.DBus.ListNames", 0).Store(&s)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to get list of owned names:", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Currently owned names on the session bus:")
+	for _, v := range s {
+		fmt.Println(v)
+	}
+}

vendor/github.com/godbus/dbus/_examples/notification.go

@@ -0,0 +1,17 @@
+package main
+
+import "github.com/godbus/dbus"
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		panic(err)
+	}
+	obj := conn.Object("org.freedesktop.Notifications", "/org/freedesktop/Notifications")
+	call := obj.Call("org.freedesktop.Notifications.Notify", 0, "", uint32(0),
+		"", "Test", "This is a test of the DBus bindings for go.", []string{},
+		map[string]dbus.Variant{}, int32(5000))
+	if call.Err != nil {
+		panic(call.Err)
+	}
+}

vendor/github.com/godbus/dbus/_examples/prop.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"fmt"
+	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/introspect"
+	"github.com/godbus/dbus/prop"
+	"os"
+)
+
+type foo string
+
+func (f foo) Foo() (string, *dbus.Error) {
+	fmt.Println(f)
+	return string(f), nil
+}
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		panic(err)
+	}
+	reply, err := conn.RequestName("com.github.guelfey.Demo",
+		dbus.NameFlagDoNotQueue)
+	if err != nil {
+		panic(err)
+	}
+	if reply != dbus.RequestNameReplyPrimaryOwner {
+		fmt.Fprintln(os.Stderr, "name already taken")
+		os.Exit(1)
+	}
+	propsSpec := map[string]map[string]*prop.Prop{
+		"com.github.guelfey.Demo": {
+			"SomeInt": {
+				int32(0),
+				true,
+				prop.EmitTrue,
+				func(c *prop.Change) *dbus.Error {
+					fmt.Println(c.Name, "changed to", c.Value)
+					return nil
+				},
+			},
+		},
+	}
+	f := foo("Bar")
+	conn.Export(f, "/com/github/guelfey/Demo", "com.github.guelfey.Demo")
+	props := prop.New(conn, "/com/github/guelfey/Demo", propsSpec)
+	n := &introspect.Node{
+		Name: "/com/github/guelfey/Demo",
+		Interfaces: []introspect.Interface{
+			introspect.IntrospectData,
+			prop.IntrospectData,
+			{
+				Name:       "com.github.guelfey.Demo",
+				Methods:    introspect.Methods(f),
+				Properties: props.Introspection("com.github.guelfey.Demo"),
+			},
+		},
+	}
+	conn.Export(introspect.NewIntrospectable(n), "/com/github/guelfey/Demo",
+		"org.freedesktop.DBus.Introspectable")
+	fmt.Println("Listening on com.github.guelfey.Demo / /com/github/guelfey/Demo ...")
+
+	c := make(chan *dbus.Signal)
+	conn.Signal(c)
+	for _ = range c {
+	}
+}

vendor/github.com/godbus/dbus/_examples/server.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/introspect"
+	"os"
+)
+
+const intro = `
+<node>
+	<interface name="com.github.guelfey.Demo">
+		<method name="Foo">
+			<arg direction="out" type="s"/>
+		</method>
+	</interface>` + introspect.IntrospectDataString + `</node> `
+
+type foo string
+
+func (f foo) Foo() (string, *dbus.Error) {
+	fmt.Println(f)
+	return string(f), nil
+}
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		panic(err)
+	}
+	reply, err := conn.RequestName("com.github.guelfey.Demo",
+		dbus.NameFlagDoNotQueue)
+	if err != nil {
+		panic(err)
+	}
+	if reply != dbus.RequestNameReplyPrimaryOwner {
+		fmt.Fprintln(os.Stderr, "name already taken")
+		os.Exit(1)
+	}
+	f := foo("Bar!")
+	conn.Export(f, "/com/github/guelfey/Demo", "com.github.guelfey.Demo")
+	conn.Export(introspect.Introspectable(intro), "/com/github/guelfey/Demo",
+		"org.freedesktop.DBus.Introspectable")
+	fmt.Println("Listening on com.github.guelfey.Demo / /com/github/guelfey/Demo ...")
+	select {}
+}

vendor/github.com/godbus/dbus/_examples/signal.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"github.com/godbus/dbus"
+	"os"
+)
+
+func main() {
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Failed to connect to session bus:", err)
+		os.Exit(1)
+	}
+
+	conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
+		"type='signal',path='/org/freedesktop/DBus',interface='org.freedesktop.DBus',sender='org.freedesktop.DBus'")
+
+	c := make(chan *dbus.Signal, 10)
+	conn.Signal(c)
+	for v := range c {
+		fmt.Println(v)
+	}
+}

vendor/github.com/godbus/dbus/auth.go

@@ -0,0 +1,253 @@
+package dbus
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"io"
+	"os"
+	"strconv"
+)
+
+// AuthStatus represents the Status of an authentication mechanism.
+type AuthStatus byte
+
+const (
+	// AuthOk signals that authentication is finished; the next command
+	// from the server should be an OK.
+	AuthOk AuthStatus = iota
+
+	// AuthContinue signals that additional data is needed; the next command
+	// from the server should be a DATA.
+	AuthContinue
+
+	// AuthError signals an error; the server sent invalid data or some
+	// other unexpected thing happened and the current authentication
+	// process should be aborted.
+	AuthError
+)
+
+type authState byte
+
+const (
+	waitingForData authState = iota
+	waitingForOk
+	waitingForReject
+)
+
+// Auth defines the behaviour of an authentication mechanism.
+type Auth interface {
+	// Return the name of the mechnism, the argument to the first AUTH command
+	// and the next status.
+	FirstData() (name, resp []byte, status AuthStatus)
+
+	// Process the given DATA command, and return the argument to the DATA
+	// command and the next status. If len(resp) == 0, no DATA command is sent.
+	HandleData(data []byte) (resp []byte, status AuthStatus)
+}
+
+// Auth authenticates the connection, trying the given list of authentication
+// mechanisms (in that order). If nil is passed, the EXTERNAL and
+// DBUS_COOKIE_SHA1 mechanisms are tried for the current user. For private
+// connections, this method must be called before sending any messages to the
+// bus. Auth must not be called on shared connections.
+func (conn *Conn) Auth(methods []Auth) error {
+	if methods == nil {
+		uid := strconv.Itoa(os.Getuid())
+		methods = []Auth{AuthExternal(uid), AuthCookieSha1(uid, getHomeDir())}
+	}
+	in := bufio.NewReader(conn.transport)
+	err := conn.transport.SendNullByte()
+	if err != nil {
+		return err
+	}
+	err = authWriteLine(conn.transport, []byte("AUTH"))
+	if err != nil {
+		return err
+	}
+	s, err := authReadLine(in)
+	if err != nil {
+		return err
+	}
+	if len(s) < 2 || !bytes.Equal(s[0], []byte("REJECTED")) {
+		return errors.New("dbus: authentication protocol error")
+	}
+	s = s[1:]
+	for _, v := range s {
+		for _, m := range methods {
+			if name, data, status := m.FirstData(); bytes.Equal(v, name) {
+				var ok bool
+				err = authWriteLine(conn.transport, []byte("AUTH"), []byte(v), data)
+				if err != nil {
+					return err
+				}
+				switch status {
+				case AuthOk:
+					err, ok = conn.tryAuth(m, waitingForOk, in)
+				case AuthContinue:
+					err, ok = conn.tryAuth(m, waitingForData, in)
+				default:
+					panic("dbus: invalid authentication status")
+				}
+				if err != nil {
+					return err
+				}
+				if ok {
+					if conn.transport.SupportsUnixFDs() {
+						err = authWriteLine(conn, []byte("NEGOTIATE_UNIX_FD"))
+						if err != nil {
+							return err
+						}
+						line, err := authReadLine(in)
+						if err != nil {
+							return err
+						}
+						switch {
+						case bytes.Equal(line[0], []byte("AGREE_UNIX_FD")):
+							conn.EnableUnixFDs()
+							conn.unixFD = true
+						case bytes.Equal(line[0], []byte("ERROR")):
+						default:
+							return errors.New("dbus: authentication protocol error")
+						}
+					}
+					err = authWriteLine(conn.transport, []byte("BEGIN"))
+					if err != nil {
+						return err
+					}
+					go conn.inWorker()
+					go conn.outWorker()
+					return nil
+				}
+			}
+		}
+	}
+	return errors.New("dbus: authentication failed")
+}
+
+// tryAuth tries to authenticate with m as the mechanism, using state as the
+// initial authState and in for reading input. It returns (nil, true) on
+// success, (nil, false) on a REJECTED and (someErr, false) if some other
+// error occured.
+func (conn *Conn) tryAuth(m Auth, state authState, in *bufio.Reader) (error, bool) {
+	for {
+		s, err := authReadLine(in)
+		if err != nil {
+			return err, false
+		}
+		switch {
+		case state == waitingForData && string(s[0]) == "DATA":
+			if len(s) != 2 {
+				err = authWriteLine(conn.transport, []byte("ERROR"))
+				if err != nil {
+					return err, false
+				}
+				continue
+			}
+			data, status := m.HandleData(s[1])
+			switch status {
+			case AuthOk, AuthContinue:
+				if len(data) != 0 {
+					err = authWriteLine(conn.transport, []byte("DATA"), data)
+					if err != nil {
+						return err, false
+					}
+				}
+				if status == AuthOk {
+					state = waitingForOk
+				}
+			case AuthError:
+				err = authWriteLine(conn.transport, []byte("ERROR"))
+				if err != nil {
+					return err, false
+				}
+			}
+		case state == waitingForData && string(s[0]) == "REJECTED":
+			return nil, false
+		case state == waitingForData && string(s[0]) == "ERROR":
+			err = authWriteLine(conn.transport, []byte("CANCEL"))
+			if err != nil {
+				return err, false
+			}
+			state = waitingForReject
+		case state == waitingForData && string(s[0]) == "OK":
+			if len(s) != 2 {
+				err = authWriteLine(conn.transport, []byte("CANCEL"))
+				if err != nil {
+					return err, false
+				}
+				state = waitingForReject
+			}
+			conn.uuid = string(s[1])
+			return nil, true
+		case state == waitingForData:
+			err = authWriteLine(conn.transport, []byte("ERROR"))
+			if err != nil {
+				return err, false
+			}
+		case state == waitingForOk && string(s[0]) == "OK":
+			if len(s) != 2 {
+				err = authWriteLine(conn.transport, []byte("CANCEL"))
+				if err != nil {
+					return err, false
+				}
+				state = waitingForReject
+			}
+			conn.uuid = string(s[1])
+			return nil, true
+		case state == waitingForOk && string(s[0]) == "REJECTED":
+			return nil, false
+		case state == waitingForOk && (string(s[0]) == "DATA" ||
+			string(s[0]) == "ERROR"):
+
+			err = authWriteLine(conn.transport, []byte("CANCEL"))
+			if err != nil {
+				return err, false
+			}
+			state = waitingForReject
+		case state == waitingForOk:
+			err = authWriteLine(conn.transport, []byte("ERROR"))
+			if err != nil {
+				return err, false
+			}
+		case state == waitingForReject && string(s[0]) == "REJECTED":
+			return nil, false
+		case state == waitingForReject:
+			return errors.New("dbus: authentication protocol error"), false
+		default:
+			panic("dbus: invalid auth state")
+		}
+	}
+}
+
+// authReadLine reads a line and separates it into its fields.
+func authReadLine(in *bufio.Reader) ([][]byte, error) {
+	data, err := in.ReadBytes('\n')
+	if err != nil {
+		return nil, err
+	}
+	data = bytes.TrimSuffix(data, []byte("\r\n"))
+	return bytes.Split(data, []byte{' '}), nil
+}
+
+// authWriteLine writes the given line in the authentication protocol format
+// (elements of data separated by a " " and terminated by "\r\n").
+func authWriteLine(out io.Writer, data ...[]byte) error {
+	buf := make([]byte, 0)
+	for i, v := range data {
+		buf = append(buf, v...)
+		if i != len(data)-1 {
+			buf = append(buf, ' ')
+		}
+	}
+	buf = append(buf, '\r')
+	buf = append(buf, '\n')
+	n, err := out.Write(buf)
+	if err != nil {
+		return err
+	}
+	if n != len(buf) {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}

vendor/github.com/godbus/dbus/auth_external.go

@@ -0,0 +1,26 @@
+package dbus
+
+import (
+	"encoding/hex"
+)
+
+// AuthExternal returns an Auth that authenticates as the given user with the
+// EXTERNAL mechanism.
+func AuthExternal(user string) Auth {
+	return authExternal{user}
+}
+
+// AuthExternal implements the EXTERNAL authentication mechanism.
+type authExternal struct {
+	user string
+}
+
+func (a authExternal) FirstData() ([]byte, []byte, AuthStatus) {
+	b := make([]byte, 2*len(a.user))
+	hex.Encode(b, []byte(a.user))
+	return []byte("EXTERNAL"), b, AuthOk
+}
+
+func (a authExternal) HandleData(b []byte) ([]byte, AuthStatus) {
+	return nil, AuthError
+}

vendor/github.com/godbus/dbus/auth_sha1.go

@@ -0,0 +1,102 @@
+package dbus
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/rand"
+	"crypto/sha1"
+	"encoding/hex"
+	"os"
+)
+
+// AuthCookieSha1 returns an Auth that authenticates as the given user with the
+// DBUS_COOKIE_SHA1 mechanism. The home parameter should specify the home
+// directory of the user.
+func AuthCookieSha1(user, home string) Auth {
+	return authCookieSha1{user, home}
+}
+
+type authCookieSha1 struct {
+	user, home string
+}
+
+func (a authCookieSha1) FirstData() ([]byte, []byte, AuthStatus) {
+	b := make([]byte, 2*len(a.user))
+	hex.Encode(b, []byte(a.user))
+	return []byte("DBUS_COOKIE_SHA1"), b, AuthContinue
+}
+
+func (a authCookieSha1) HandleData(data []byte) ([]byte, AuthStatus) {
+	challenge := make([]byte, len(data)/2)
+	_, err := hex.Decode(challenge, data)
+	if err != nil {
+		return nil, AuthError
+	}
+	b := bytes.Split(challenge, []byte{' '})
+	if len(b) != 3 {
+		return nil, AuthError
+	}
+	context := b[0]
+	id := b[1]
+	svchallenge := b[2]
+	cookie := a.getCookie(context, id)
+	if cookie == nil {
+		return nil, AuthError
+	}
+	clchallenge := a.generateChallenge()
+	if clchallenge == nil {
+		return nil, AuthError
+	}
+	hash := sha1.New()
+	hash.Write(bytes.Join([][]byte{svchallenge, clchallenge, cookie}, []byte{':'}))
+	hexhash := make([]byte, 2*hash.Size())
+	hex.Encode(hexhash, hash.Sum(nil))
+	data = append(clchallenge, ' ')
+	data = append(data, hexhash...)
+	resp := make([]byte, 2*len(data))
+	hex.Encode(resp, data)
+	return resp, AuthOk
+}
+
+// getCookie searches for the cookie identified by id in context and returns
+// the cookie content or nil. (Since HandleData can't return a specific error,
+// but only whether an error occured, this function also doesn't bother to
+// return an error.)
+func (a authCookieSha1) getCookie(context, id []byte) []byte {
+	file, err := os.Open(a.home + "/.dbus-keyrings/" + string(context))
+	if err != nil {
+		return nil
+	}
+	defer file.Close()
+	rd := bufio.NewReader(file)
+	for {
+		line, err := rd.ReadBytes('\n')
+		if err != nil {
+			return nil
+		}
+		line = line[:len(line)-1]
+		b := bytes.Split(line, []byte{' '})
+		if len(b) != 3 {
+			return nil
+		}
+		if bytes.Equal(b[0], id) {
+			return b[2]
+		}
+	}
+}
+
+// generateChallenge returns a random, hex-encoded challenge, or nil on error
+// (see above).
+func (a authCookieSha1) generateChallenge() []byte {
+	b := make([]byte, 16)
+	n, err := rand.Read(b)
+	if err != nil {
+		return nil
+	}
+	if n != 16 {
+		return nil
+	}
+	enc := make([]byte, 32)
+	hex.Encode(enc, b)
+	return enc
+}

vendor/github.com/godbus/dbus/call.go

@@ -0,0 +1,36 @@
+package dbus
+
+import (
+	"errors"
+)
+
+// Call represents a pending or completed method call.
+type Call struct {
+	Destination string
+	Path        ObjectPath
+	Method      string
+	Args        []interface{}
+
+	// Strobes when the call is complete.
+	Done chan *Call
+
+	// After completion, the error status. If this is non-nil, it may be an
+	// error message from the peer (with Error as its type) or some other error.
+	Err error
+
+	// Holds the response once the call is done.
+	Body []interface{}
+}
+
+var errSignature = errors.New("dbus: mismatched signature")
+
+// Store stores the body of the reply into the provided pointers. It returns
+// an error if the signatures of the body and retvalues don't match, or if
+// the error status is not nil.
+func (c *Call) Store(retvalues ...interface{}) error {
+	if c.Err != nil {
+		return c.Err
+	}
+
+	return Store(c.Body, retvalues...)
+}

vendor/github.com/godbus/dbus/conn.go

@@ -0,0 +1,683 @@
+package dbus
+
+import (
+	"errors"
+	"io"
+	"os"
+	"reflect"
+	"strings"
+	"sync"
+)
+
+var (
+	systemBus     *Conn
+	systemBusLck  sync.Mutex
+	sessionBus    *Conn
+	sessionBusLck sync.Mutex
+	sessionEnvLck sync.Mutex
+)
+
+// ErrClosed is the error returned by calls on a closed connection.
+var ErrClosed = errors.New("dbus: connection closed by user")
+
+// Conn represents a connection to a message bus (usually, the system or
+// session bus).
+//
+// Connections are either shared or private. Shared connections
+// are shared between calls to the functions that return them. As a result,
+// the methods Close, Auth and Hello must not be called on them.
+//
+// Multiple goroutines may invoke methods on a connection simultaneously.
+type Conn struct {
+	transport
+
+	busObj BusObject
+	unixFD bool
+	uuid   string
+
+	names    []string
+	namesLck sync.RWMutex
+
+	serialLck  sync.Mutex
+	nextSerial uint32
+	serialUsed map[uint32]bool
+
+	calls    map[uint32]*Call
+	callsLck sync.RWMutex
+
+	handler Handler
+
+	out    chan *Message
+	closed bool
+	outLck sync.RWMutex
+
+	signalHandler SignalHandler
+
+	eavesdropped    chan<- *Message
+	eavesdroppedLck sync.Mutex
+}
+
+// SessionBus returns a shared connection to the session bus, connecting to it
+// if not already done.
+func SessionBus() (conn *Conn, err error) {
+	sessionBusLck.Lock()
+	defer sessionBusLck.Unlock()
+	if sessionBus != nil {
+		return sessionBus, nil
+	}
+	defer func() {
+		if conn != nil {
+			sessionBus = conn
+		}
+	}()
+	conn, err = SessionBusPrivate()
+	if err != nil {
+		return
+	}
+	if err = conn.Auth(nil); err != nil {
+		conn.Close()
+		conn = nil
+		return
+	}
+	if err = conn.Hello(); err != nil {
+		conn.Close()
+		conn = nil
+	}
+	return
+}
+
+func getSessionBusAddress() (string, error) {
+	sessionEnvLck.Lock()
+	defer sessionEnvLck.Unlock()
+	address := os.Getenv("DBUS_SESSION_BUS_ADDRESS")
+	if address != "" && address != "autolaunch:" {
+		return address, nil
+	}
+	return getSessionBusPlatformAddress()
+}
+
+// SessionBusPrivate returns a new private connection to the session bus.
+func SessionBusPrivate() (*Conn, error) {
+	address, err := getSessionBusAddress()
+	if err != nil {
+		return nil, err
+	}
+
+	return Dial(address)
+}
+
+// SessionBusPrivate returns a new private connection to the session bus.
+func SessionBusPrivateHandler(handler Handler, signalHandler SignalHandler) (*Conn, error) {
+	address, err := getSessionBusAddress()
+	if err != nil {
+		return nil, err
+	}
+	return DialHandler(address, handler, signalHandler)
+}
+
+// SystemBus returns a shared connection to the system bus, connecting to it if
+// not already done.
+func SystemBus() (conn *Conn, err error) {
+	systemBusLck.Lock()
+	defer systemBusLck.Unlock()
+	if systemBus != nil {
+		return systemBus, nil
+	}
+	defer func() {
+		if conn != nil {
+			systemBus = conn
+		}
+	}()
+	conn, err = SystemBusPrivate()
+	if err != nil {
+		return
+	}
+	if err = conn.Auth(nil); err != nil {
+		conn.Close()
+		conn = nil
+		return
+	}
+	if err = conn.Hello(); err != nil {
+		conn.Close()
+		conn = nil
+	}
+	return
+}
+
+// SystemBusPrivate returns a new private connection to the system bus.
+func SystemBusPrivate() (*Conn, error) {
+	return Dial(getSystemBusPlatformAddress())
+}
+
+// SystemBusPrivateHandler returns a new private connection to the system bus, using the provided handlers.
+func SystemBusPrivateHandler(handler Handler, signalHandler SignalHandler) (*Conn, error) {
+	return DialHandler(getSystemBusPlatformAddress(), handler, signalHandler)
+}
+
+// Dial establishes a new private connection to the message bus specified by address.
+func Dial(address string) (*Conn, error) {
+	tr, err := getTransport(address)
+	if err != nil {
+		return nil, err
+	}
+	return newConn(tr, NewDefaultHandler(), NewDefaultSignalHandler())
+}
+
+// DialHandler establishes a new private connection to the message bus specified by address, using the supplied handlers.
+func DialHandler(address string, handler Handler, signalHandler SignalHandler) (*Conn, error) {
+	tr, err := getTransport(address)
+	if err != nil {
+		return nil, err
+	}
+	return newConn(tr, handler, signalHandler)
+}
+
+// NewConn creates a new private *Conn from an already established connection.
+func NewConn(conn io.ReadWriteCloser) (*Conn, error) {
+	return NewConnHandler(conn, NewDefaultHandler(), NewDefaultSignalHandler())
+}
+
+// NewConnHandler creates a new private *Conn from an already established connection, using the supplied handlers.
+func NewConnHandler(conn io.ReadWriteCloser, handler Handler, signalHandler SignalHandler) (*Conn, error) {
+	return newConn(genericTransport{conn}, handler, signalHandler)
+}
+
+// newConn creates a new *Conn from a transport.
+func newConn(tr transport, handler Handler, signalHandler SignalHandler) (*Conn, error) {
+	conn := new(Conn)
+	conn.transport = tr
+	conn.calls = make(map[uint32]*Call)
+	conn.out = make(chan *Message, 10)
+	conn.handler = handler
+	conn.signalHandler = signalHandler
+	conn.nextSerial = 1
+	conn.serialUsed = map[uint32]bool{0: true}
+	conn.busObj = conn.Object("org.freedesktop.DBus", "/org/freedesktop/DBus")
+	return conn, nil
+}
+
+// BusObject returns the object owned by the bus daemon which handles
+// administrative requests.
+func (conn *Conn) BusObject() BusObject {
+	return conn.busObj
+}
+
+// Close closes the connection. Any blocked operations will return with errors
+// and the channels passed to Eavesdrop and Signal are closed. This method must
+// not be called on shared connections.
+func (conn *Conn) Close() error {
+	conn.outLck.Lock()
+	if conn.closed {
+		// inWorker calls Close on read error, the read error may
+		// be caused by another caller calling Close to shutdown the
+		// dbus connection, a double-close scenario we prevent here.
+		conn.outLck.Unlock()
+		return nil
+	}
+	close(conn.out)
+	conn.closed = true
+	conn.outLck.Unlock()
+
+	if term, ok := conn.signalHandler.(Terminator); ok {
+		term.Terminate()
+	}
+
+	if term, ok := conn.handler.(Terminator); ok {
+		term.Terminate()
+	}
+
+	conn.eavesdroppedLck.Lock()
+	if conn.eavesdropped != nil {
+		close(conn.eavesdropped)
+	}
+	conn.eavesdroppedLck.Unlock()
+
+	return conn.transport.Close()
+}
+
+// Eavesdrop causes conn to send all incoming messages to the given channel
+// without further processing. Method replies, errors and signals will not be
+// sent to the appropiate channels and method calls will not be handled. If nil
+// is passed, the normal behaviour is restored.
+//
+// The caller has to make sure that ch is sufficiently buffered;
+// if a message arrives when a write to ch is not possible, the message is
+// discarded.
+func (conn *Conn) Eavesdrop(ch chan<- *Message) {
+	conn.eavesdroppedLck.Lock()
+	conn.eavesdropped = ch
+	conn.eavesdroppedLck.Unlock()
+}
+
+// getSerial returns an unused serial.
+func (conn *Conn) getSerial() uint32 {
+	conn.serialLck.Lock()
+	defer conn.serialLck.Unlock()
+	n := conn.nextSerial
+	for conn.serialUsed[n] {
+		n++
+	}
+	conn.serialUsed[n] = true
+	conn.nextSerial = n + 1
+	return n
+}
+
+// Hello sends the initial org.freedesktop.DBus.Hello call. This method must be
+// called after authentication, but before sending any other messages to the
+// bus. Hello must not be called for shared connections.
+func (conn *Conn) Hello() error {
+	var s string
+	err := conn.busObj.Call("org.freedesktop.DBus.Hello", 0).Store(&s)
+	if err != nil {
+		return err
+	}
+	conn.namesLck.Lock()
+	conn.names = make([]string, 1)
+	conn.names[0] = s
+	conn.namesLck.Unlock()
+	return nil
+}
+
+// inWorker runs in an own goroutine, reading incoming messages from the
+// transport and dispatching them appropiately.
+func (conn *Conn) inWorker() {
+	for {
+		msg, err := conn.ReadMessage()
+		if err == nil {
+			conn.eavesdroppedLck.Lock()
+			if conn.eavesdropped != nil {
+				select {
+				case conn.eavesdropped <- msg:
+				default:
+				}
+				conn.eavesdroppedLck.Unlock()
+				continue
+			}
+			conn.eavesdroppedLck.Unlock()
+			dest, _ := msg.Headers[FieldDestination].value.(string)
+			found := false
+			if dest == "" {
+				found = true
+			} else {
+				conn.namesLck.RLock()
+				if len(conn.names) == 0 {
+					found = true
+				}
+				for _, v := range conn.names {
+					if dest == v {
+						found = true
+						break
+					}
+				}
+				conn.namesLck.RUnlock()
+			}
+			if !found {
+				// Eavesdropped a message, but no channel for it is registered.
+				// Ignore it.
+				continue
+			}
+			switch msg.Type {
+			case TypeMethodReply, TypeError:
+				serial := msg.Headers[FieldReplySerial].value.(uint32)
+				conn.callsLck.Lock()
+				if c, ok := conn.calls[serial]; ok {
+					if msg.Type == TypeError {
+						name, _ := msg.Headers[FieldErrorName].value.(string)
+						c.Err = Error{name, msg.Body}
+					} else {
+						c.Body = msg.Body
+					}
+					c.Done <- c
+					conn.serialLck.Lock()
+					delete(conn.serialUsed, serial)
+					conn.serialLck.Unlock()
+					delete(conn.calls, serial)
+				}
+				conn.callsLck.Unlock()
+			case TypeSignal:
+				iface := msg.Headers[FieldInterface].value.(string)
+				member := msg.Headers[FieldMember].value.(string)
+				// as per http://dbus.freedesktop.org/doc/dbus-specification.html ,
+				// sender is optional for signals.
+				sender, _ := msg.Headers[FieldSender].value.(string)
+				if iface == "org.freedesktop.DBus" && sender == "org.freedesktop.DBus" {
+					if member == "NameLost" {
+						// If we lost the name on the bus, remove it from our
+						// tracking list.
+						name, ok := msg.Body[0].(string)
+						if !ok {
+							panic("Unable to read the lost name")
+						}
+						conn.namesLck.Lock()
+						for i, v := range conn.names {
+							if v == name {
+								conn.names = append(conn.names[:i],
+									conn.names[i+1:]...)
+							}
+						}
+						conn.namesLck.Unlock()
+					} else if member == "NameAcquired" {
+						// If we acquired the name on the bus, add it to our
+						// tracking list.
+						name, ok := msg.Body[0].(string)
+						if !ok {
+							panic("Unable to read the acquired name")
+						}
+						conn.namesLck.Lock()
+						conn.names = append(conn.names, name)
+						conn.namesLck.Unlock()
+					}
+				}
+				conn.handleSignal(msg)
+			case TypeMethodCall:
+				go conn.handleCall(msg)
+			}
+		} else if _, ok := err.(InvalidMessageError); !ok {
+			// Some read error occured (usually EOF); we can't really do
+			// anything but to shut down all stuff and returns errors to all
+			// pending replies.
+			conn.Close()
+			conn.callsLck.RLock()
+			for _, v := range conn.calls {
+				v.Err = err
+				v.Done <- v
+			}
+			conn.callsLck.RUnlock()
+			return
+		}
+		// invalid messages are ignored
+	}
+}
+
+func (conn *Conn) handleSignal(msg *Message) {
+	iface := msg.Headers[FieldInterface].value.(string)
+	member := msg.Headers[FieldMember].value.(string)
+	// as per http://dbus.freedesktop.org/doc/dbus-specification.html ,
+	// sender is optional for signals.
+	sender, _ := msg.Headers[FieldSender].value.(string)
+	signal := &Signal{
+		Sender: sender,
+		Path:   msg.Headers[FieldPath].value.(ObjectPath),
+		Name:   iface + "." + member,
+		Body:   msg.Body,
+	}
+	conn.signalHandler.DeliverSignal(iface, member, signal)
+}
+
+// Names returns the list of all names that are currently owned by this
+// connection. The slice is always at least one element long, the first element
+// being the unique name of the connection.
+func (conn *Conn) Names() []string {
+	conn.namesLck.RLock()
+	// copy the slice so it can't be modified
+	s := make([]string, len(conn.names))
+	copy(s, conn.names)
+	conn.namesLck.RUnlock()
+	return s
+}
+
+// Object returns the object identified by the given destination name and path.
+func (conn *Conn) Object(dest string, path ObjectPath) BusObject {
+	return &Object{conn, dest, path}
+}
+
+// outWorker runs in an own goroutine, encoding and sending messages that are
+// sent to conn.out.
+func (conn *Conn) outWorker() {
+	for msg := range conn.out {
+		err := conn.SendMessage(msg)
+		conn.callsLck.RLock()
+		if err != nil {
+			if c := conn.calls[msg.serial]; c != nil {
+				c.Err = err
+				c.Done <- c
+			}
+			conn.serialLck.Lock()
+			delete(conn.serialUsed, msg.serial)
+			conn.serialLck.Unlock()
+		} else if msg.Type != TypeMethodCall {
+			conn.serialLck.Lock()
+			delete(conn.serialUsed, msg.serial)
+			conn.serialLck.Unlock()
+		}
+		conn.callsLck.RUnlock()
+	}
+}
+
+// Send sends the given message to the message bus. You usually don't need to
+// use this; use the higher-level equivalents (Call / Go, Emit and Export)
+// instead. If msg is a method call and NoReplyExpected is not set, a non-nil
+// call is returned and the same value is sent to ch (which must be buffered)
+// once the call is complete. Otherwise, ch is ignored and a Call structure is
+// returned of which only the Err member is valid.
+func (conn *Conn) Send(msg *Message, ch chan *Call) *Call {
+	var call *Call
+
+	msg.serial = conn.getSerial()
+	if msg.Type == TypeMethodCall && msg.Flags&FlagNoReplyExpected == 0 {
+		if ch == nil {
+			ch = make(chan *Call, 5)
+		} else if cap(ch) == 0 {
+			panic("dbus: unbuffered channel passed to (*Conn).Send")
+		}
+		call = new(Call)
+		call.Destination, _ = msg.Headers[FieldDestination].value.(string)
+		call.Path, _ = msg.Headers[FieldPath].value.(ObjectPath)
+		iface, _ := msg.Headers[FieldInterface].value.(string)
+		member, _ := msg.Headers[FieldMember].value.(string)
+		call.Method = iface + "." + member
+		call.Args = msg.Body
+		call.Done = ch
+		conn.callsLck.Lock()
+		conn.calls[msg.serial] = call
+		conn.callsLck.Unlock()
+		conn.outLck.RLock()
+		if conn.closed {
+			call.Err = ErrClosed
+			call.Done <- call
+		} else {
+			conn.out <- msg
+		}
+		conn.outLck.RUnlock()
+	} else {
+		conn.outLck.RLock()
+		if conn.closed {
+			call = &Call{Err: ErrClosed}
+		} else {
+			conn.out <- msg
+			call = &Call{Err: nil}
+		}
+		conn.outLck.RUnlock()
+	}
+	return call
+}
+
+// sendError creates an error message corresponding to the parameters and sends
+// it to conn.out.
+func (conn *Conn) sendError(err error, dest string, serial uint32) {
+	var e *Error
+	switch em := err.(type) {
+	case Error:
+		e = &em
+	case *Error:
+		e = em
+	case DBusError:
+		name, body := em.DBusError()
+		e = NewError(name, body)
+	default:
+		e = MakeFailedError(err)
+	}
+	msg := new(Message)
+	msg.Type = TypeError
+	msg.serial = conn.getSerial()
+	msg.Headers = make(map[HeaderField]Variant)
+	if dest != "" {
+		msg.Headers[FieldDestination] = MakeVariant(dest)
+	}
+	msg.Headers[FieldErrorName] = MakeVariant(e.Name)
+	msg.Headers[FieldReplySerial] = MakeVariant(serial)
+	msg.Body = e.Body
+	if len(e.Body) > 0 {
+		msg.Headers[FieldSignature] = MakeVariant(SignatureOf(e.Body...))
+	}
+	conn.outLck.RLock()
+	if !conn.closed {
+		conn.out <- msg
+	}
+	conn.outLck.RUnlock()
+}
+
+// sendReply creates a method reply message corresponding to the parameters and
+// sends it to conn.out.
+func (conn *Conn) sendReply(dest string, serial uint32, values ...interface{}) {
+	msg := new(Message)
+	msg.Type = TypeMethodReply
+	msg.serial = conn.getSerial()
+	msg.Headers = make(map[HeaderField]Variant)
+	if dest != "" {
+		msg.Headers[FieldDestination] = MakeVariant(dest)
+	}
+	msg.Headers[FieldReplySerial] = MakeVariant(serial)
+	msg.Body = values
+	if len(values) > 0 {
+		msg.Headers[FieldSignature] = MakeVariant(SignatureOf(values...))
+	}
+	conn.outLck.RLock()
+	if !conn.closed {
+		conn.out <- msg
+	}
+	conn.outLck.RUnlock()
+}
+
+func (conn *Conn) defaultSignalAction(fn func(h *defaultSignalHandler, ch chan<- *Signal), ch chan<- *Signal) {
+	if !isDefaultSignalHandler(conn.signalHandler) {
+		return
+	}
+	handler := conn.signalHandler.(*defaultSignalHandler)
+	fn(handler, ch)
+}
+
+// Signal registers the given channel to be passed all received signal messages.
+// The caller has to make sure that ch is sufficiently buffered; if a message
+// arrives when a write to c is not possible, it is discarded.
+//
+// Multiple of these channels can be registered at the same time.
+//
+// These channels are "overwritten" by Eavesdrop; i.e., if there currently is a
+// channel for eavesdropped messages, this channel receives all signals, and
+// none of the channels passed to Signal will receive any signals.
+func (conn *Conn) Signal(ch chan<- *Signal) {
+	conn.defaultSignalAction((*defaultSignalHandler).addSignal, ch)
+}
+
+// RemoveSignal removes the given channel from the list of the registered channels.
+func (conn *Conn) RemoveSignal(ch chan<- *Signal) {
+	conn.defaultSignalAction((*defaultSignalHandler).removeSignal, ch)
+}
+
+// SupportsUnixFDs returns whether the underlying transport supports passing of
+// unix file descriptors. If this is false, method calls containing unix file
+// descriptors will return an error and emitted signals containing them will
+// not be sent.
+func (conn *Conn) SupportsUnixFDs() bool {
+	return conn.unixFD
+}
+
+// Error represents a D-Bus message of type Error.
+type Error struct {
+	Name string
+	Body []interface{}
+}
+
+func NewError(name string, body []interface{}) *Error {
+	return &Error{name, body}
+}
+
+func (e Error) Error() string {
+	if len(e.Body) >= 1 {
+		s, ok := e.Body[0].(string)
+		if ok {
+			return s
+		}
+	}
+	return e.Name
+}
+
+// Signal represents a D-Bus message of type Signal. The name member is given in
+// "interface.member" notation, e.g. org.freedesktop.D-Bus.NameLost.
+type Signal struct {
+	Sender string
+	Path   ObjectPath
+	Name   string
+	Body   []interface{}
+}
+
+// transport is a D-Bus transport.
+type transport interface {
+	// Read and Write raw data (for example, for the authentication protocol).
+	io.ReadWriteCloser
+
+	// Send the initial null byte used for the EXTERNAL mechanism.
+	SendNullByte() error
+
+	// Returns whether this transport supports passing Unix FDs.
+	SupportsUnixFDs() bool
+
+	// Signal the transport that Unix FD passing is enabled for this connection.
+	EnableUnixFDs()
+
+	// Read / send a message, handling things like Unix FDs.
+	ReadMessage() (*Message, error)
+	SendMessage(*Message) error
+}
+
+var (
+	transports = make(map[string]func(string) (transport, error))
+)
+
+func getTransport(address string) (transport, error) {
+	var err error
+	var t transport
+
+	addresses := strings.Split(address, ";")
+	for _, v := range addresses {
+		i := strings.IndexRune(v, ':')
+		if i == -1 {
+			err = errors.New("dbus: invalid bus address (no transport)")
+			continue
+		}
+		f := transports[v[:i]]
+		if f == nil {
+			err = errors.New("dbus: invalid bus address (invalid or unsupported transport)")
+			continue
+		}
+		t, err = f(v[i+1:])
+		if err == nil {
+			return t, nil
+		}
+	}
+	return nil, err
+}
+
+// dereferenceAll returns a slice that, assuming that vs is a slice of pointers
+// of arbitrary types, containes the values that are obtained from dereferencing
+// all elements in vs.
+func dereferenceAll(vs []interface{}) []interface{} {
+	for i := range vs {
+		v := reflect.ValueOf(vs[i])
+		v = v.Elem()
+		vs[i] = v.Interface()
+	}
+	return vs
+}
+
+// getKey gets a key from a the list of keys. Returns "" on error / not found...
+func getKey(s, key string) string {
+	for _, keyEqualsValue := range strings.Split(s, ",") {
+		keyValue := strings.SplitN(keyEqualsValue, "=", 2)
+		if len(keyValue) == 2 && keyValue[0] == key {
+			return keyValue[1]
+		}
+	}
+	return ""
+}

vendor/github.com/godbus/dbus/conn_darwin.go

@@ -0,0 +1,33 @@
+package dbus
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+const defaultSystemBusAddress = "unix:path=/opt/local/var/run/dbus/system_bus_socket"
+
+func getSessionBusPlatformAddress() (string, error) {
+	cmd := exec.Command("launchctl", "getenv", "DBUS_LAUNCHD_SESSION_BUS_SOCKET")
+	b, err := cmd.CombinedOutput()
+
+	if err != nil {
+		return "", err
+	}
+
+	if len(b) == 0 {
+		return "", errors.New("dbus: couldn't determine address of session bus")
+	}
+
+	return "unix:path=" + string(b[:len(b)-1]), nil
+}
+
+func getSystemBusPlatformAddress() string {
+	address := os.Getenv("DBUS_LAUNCHD_SESSION_BUS_SOCKET")
+	if address != "" {
+		return fmt.Sprintf("unix:path=%s", address)
+	}
+	return defaultSystemBusAddress
+}

vendor/github.com/godbus/dbus/conn_other.go

@@ -0,0 +1,42 @@
+// +build !darwin
+
+package dbus
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+const defaultSystemBusAddress = "unix:path=/var/run/dbus/system_bus_socket"
+
+func getSessionBusPlatformAddress() (string, error) {
+	cmd := exec.Command("dbus-launch")
+	b, err := cmd.CombinedOutput()
+
+	if err != nil {
+		return "", err
+	}
+
+	i := bytes.IndexByte(b, '=')
+	j := bytes.IndexByte(b, '\n')
+
+	if i == -1 || j == -1 {
+		return "", errors.New("dbus: couldn't determine address of session bus")
+	}
+
+	env, addr := string(b[0:i]), string(b[i+1:j])
+	os.Setenv(env, addr)
+
+	return addr, nil
+}
+
+func getSystemBusPlatformAddress() string {
+	address := os.Getenv("DBUS_SYSTEM_BUS_ADDRESS")
+	if address != "" {
+		return fmt.Sprintf("unix:path=%s", address)
+	}
+	return defaultSystemBusAddress
+}

vendor/github.com/godbus/dbus/conn_test.go

@@ -0,0 +1,325 @@
+package dbus
+
+import (
+	"encoding/binary"
+	"io"
+	"io/ioutil"
+	"testing"
+	"time"
+)
+
+func TestSessionBus(t *testing.T) {
+	_, err := SessionBus()
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestSystemBus(t *testing.T) {
+	_, err := SystemBus()
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestSend(t *testing.T) {
+	bus, err := SessionBus()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ch := make(chan *Call, 1)
+	msg := &Message{
+		Type:  TypeMethodCall,
+		Flags: 0,
+		Headers: map[HeaderField]Variant{
+			FieldDestination: MakeVariant(bus.Names()[0]),
+			FieldPath:        MakeVariant(ObjectPath("/org/freedesktop/DBus")),
+			FieldInterface:   MakeVariant("org.freedesktop.DBus.Peer"),
+			FieldMember:      MakeVariant("Ping"),
+		},
+	}
+	call := bus.Send(msg, ch)
+	<-ch
+	if call.Err != nil {
+		t.Error(call.Err)
+	}
+}
+
+func TestFlagNoReplyExpectedSend(t *testing.T) {
+	bus, err := SessionBus()
+	if err != nil {
+		t.Fatal(err)
+	}
+	done := make(chan struct{})
+	go func() {
+		bus.BusObject().Call("org.freedesktop.DBus.ListNames", FlagNoReplyExpected)
+		close(done)
+	}()
+	select {
+	case <-done:
+	case <-time.After(1 * time.Second):
+		t.Error("Failed to announce that the call was done")
+	}
+}
+
+func TestRemoveSignal(t *testing.T) {
+	bus, err := NewConn(nil)
+	if err != nil {
+		t.Error(err)
+	}
+	signals := bus.signalHandler.(*defaultSignalHandler).signals
+	ch := make(chan *Signal)
+	ch2 := make(chan *Signal)
+	for _, ch := range []chan *Signal{ch, ch2, ch, ch2, ch2, ch} {
+		bus.Signal(ch)
+	}
+	signals = bus.signalHandler.(*defaultSignalHandler).signals
+	if len(signals) != 6 {
+		t.Errorf("remove signal: signals length not equal: got '%d', want '6'", len(signals))
+	}
+	bus.RemoveSignal(ch)
+	signals = bus.signalHandler.(*defaultSignalHandler).signals
+	if len(signals) != 3 {
+		t.Errorf("remove signal: signals length not equal: got '%d', want '3'", len(signals))
+	}
+	signals = bus.signalHandler.(*defaultSignalHandler).signals
+	for _, bch := range signals {
+		if bch != ch2 {
+			t.Errorf("remove signal: removed signal present: got '%v', want '%v'", bch, ch2)
+		}
+	}
+}
+
+type rwc struct {
+	io.Reader
+	io.Writer
+}
+
+func (rwc) Close() error { return nil }
+
+type fakeAuth struct {
+}
+
+func (fakeAuth) FirstData() (name, resp []byte, status AuthStatus) {
+	return []byte("name"), []byte("resp"), AuthOk
+}
+
+func (fakeAuth) HandleData(data []byte) (resp []byte, status AuthStatus) {
+	return nil, AuthOk
+}
+
+func TestCloseBeforeSignal(t *testing.T) {
+	reader, pipewriter := io.Pipe()
+	defer pipewriter.Close()
+	defer reader.Close()
+
+	bus, err := NewConn(rwc{Reader: reader, Writer: ioutil.Discard})
+	if err != nil {
+		t.Fatal(err)
+	}
+	// give ch a buffer so sends won't block
+	ch := make(chan *Signal, 1)
+	bus.Signal(ch)
+
+	go func() {
+		_, err := pipewriter.Write([]byte("REJECTED name\r\nOK myuuid\r\n"))
+		if err != nil {
+			t.Errorf("error writing to pipe: %v", err)
+		}
+	}()
+
+	err = bus.Auth([]Auth{fakeAuth{}})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = bus.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	msg := &Message{
+		Type: TypeSignal,
+		Headers: map[HeaderField]Variant{
+			FieldInterface: MakeVariant("foo.bar"),
+			FieldMember:    MakeVariant("bar"),
+			FieldPath:      MakeVariant(ObjectPath("/baz")),
+		},
+	}
+	err = msg.EncodeTo(pipewriter, binary.LittleEndian)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+type server struct{}
+
+func (server) Double(i int64) (int64, *Error) {
+	return 2 * i, nil
+}
+
+func BenchmarkCall(b *testing.B) {
+	b.StopTimer()
+	var s string
+	bus, err := SessionBus()
+	if err != nil {
+		b.Fatal(err)
+	}
+	name := bus.Names()[0]
+	obj := bus.BusObject()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		err := obj.Call("org.freedesktop.DBus.GetNameOwner", 0, name).Store(&s)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if s != name {
+			b.Errorf("got %s, wanted %s", s, name)
+		}
+	}
+}
+
+func BenchmarkCallAsync(b *testing.B) {
+	b.StopTimer()
+	bus, err := SessionBus()
+	if err != nil {
+		b.Fatal(err)
+	}
+	name := bus.Names()[0]
+	obj := bus.BusObject()
+	c := make(chan *Call, 50)
+	done := make(chan struct{})
+	go func() {
+		for i := 0; i < b.N; i++ {
+			v := <-c
+			if v.Err != nil {
+				b.Error(v.Err)
+			}
+			s := v.Body[0].(string)
+			if s != name {
+				b.Errorf("got %s, wanted %s", s, name)
+			}
+		}
+		close(done)
+	}()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		obj.Go("org.freedesktop.DBus.GetNameOwner", 0, c, name)
+	}
+	<-done
+}
+
+func BenchmarkServe(b *testing.B) {
+	b.StopTimer()
+	srv, err := SessionBus()
+	if err != nil {
+		b.Fatal(err)
+	}
+	cli, err := SessionBusPrivate()
+	if err != nil {
+		b.Fatal(err)
+	}
+	if err = cli.Auth(nil); err != nil {
+		b.Fatal(err)
+	}
+	if err = cli.Hello(); err != nil {
+		b.Fatal(err)
+	}
+	benchmarkServe(b, srv, cli)
+}
+
+func BenchmarkServeAsync(b *testing.B) {
+	b.StopTimer()
+	srv, err := SessionBus()
+	if err != nil {
+		b.Fatal(err)
+	}
+	cli, err := SessionBusPrivate()
+	if err != nil {
+		b.Fatal(err)
+	}
+	if err = cli.Auth(nil); err != nil {
+		b.Fatal(err)
+	}
+	if err = cli.Hello(); err != nil {
+		b.Fatal(err)
+	}
+	benchmarkServeAsync(b, srv, cli)
+}
+
+func BenchmarkServeSameConn(b *testing.B) {
+	b.StopTimer()
+	bus, err := SessionBus()
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	benchmarkServe(b, bus, bus)
+}
+
+func BenchmarkServeSameConnAsync(b *testing.B) {
+	b.StopTimer()
+	bus, err := SessionBus()
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	benchmarkServeAsync(b, bus, bus)
+}
+
+func benchmarkServe(b *testing.B, srv, cli *Conn) {
+	var r int64
+	var err error
+	dest := srv.Names()[0]
+	srv.Export(server{}, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	obj := cli.Object(dest, "/org/guelfey/DBus/Test")
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		err = obj.Call("org.guelfey.DBus.Test.Double", 0, int64(i)).Store(&r)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if r != 2*int64(i) {
+			b.Errorf("got %d, wanted %d", r, 2*int64(i))
+		}
+	}
+}
+
+func benchmarkServeAsync(b *testing.B, srv, cli *Conn) {
+	dest := srv.Names()[0]
+	srv.Export(server{}, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	obj := cli.Object(dest, "/org/guelfey/DBus/Test")
+	c := make(chan *Call, 50)
+	done := make(chan struct{})
+	go func() {
+		for i := 0; i < b.N; i++ {
+			v := <-c
+			if v.Err != nil {
+				b.Fatal(v.Err)
+			}
+			i, r := v.Args[0].(int64), v.Body[0].(int64)
+			if 2*i != r {
+				b.Errorf("got %d, wanted %d", r, 2*i)
+			}
+		}
+		close(done)
+	}()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		obj.Go("org.guelfey.DBus.Test.Double", 0, c, int64(i))
+	}
+	<-done
+}
+
+func TestGetKey(t *testing.T) {
+	keys := "host=1.2.3.4,port=5678,family=ipv4"
+	if host := getKey(keys, "host"); host != "1.2.3.4" {
+		t.Error(`Expected "1.2.3.4", got`, host)
+	}
+	if port := getKey(keys, "port"); port != "5678" {
+		t.Error(`Expected "5678", got`, port)
+	}
+	if family := getKey(keys, "family"); family != "ipv4" {
+		t.Error(`Expected "ipv4", got`, family)
+	}
+}

vendor/github.com/godbus/dbus/dbus.go

@@ -0,0 +1,427 @@
+package dbus
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+var (
+	byteType        = reflect.TypeOf(byte(0))
+	boolType        = reflect.TypeOf(false)
+	uint8Type       = reflect.TypeOf(uint8(0))
+	int16Type       = reflect.TypeOf(int16(0))
+	uint16Type      = reflect.TypeOf(uint16(0))
+	intType         = reflect.TypeOf(int(0))
+	uintType        = reflect.TypeOf(uint(0))
+	int32Type       = reflect.TypeOf(int32(0))
+	uint32Type      = reflect.TypeOf(uint32(0))
+	int64Type       = reflect.TypeOf(int64(0))
+	uint64Type      = reflect.TypeOf(uint64(0))
+	float64Type     = reflect.TypeOf(float64(0))
+	stringType      = reflect.TypeOf("")
+	signatureType   = reflect.TypeOf(Signature{""})
+	objectPathType  = reflect.TypeOf(ObjectPath(""))
+	variantType     = reflect.TypeOf(Variant{Signature{""}, nil})
+	interfacesType  = reflect.TypeOf([]interface{}{})
+	interfaceType   = reflect.TypeOf((*interface{})(nil)).Elem()
+	unixFDType      = reflect.TypeOf(UnixFD(0))
+	unixFDIndexType = reflect.TypeOf(UnixFDIndex(0))
+)
+
+// An InvalidTypeError signals that a value which cannot be represented in the
+// D-Bus wire format was passed to a function.
+type InvalidTypeError struct {
+	Type reflect.Type
+}
+
+func (e InvalidTypeError) Error() string {
+	return "dbus: invalid type " + e.Type.String()
+}
+
+// Store copies the values contained in src to dest, which must be a slice of
+// pointers. It converts slices of interfaces from src to corresponding structs
+// in dest. An error is returned if the lengths of src and dest or the types of
+// their elements don't match.
+func Store(src []interface{}, dest ...interface{}) error {
+	if len(src) != len(dest) {
+		return errors.New("dbus.Store: length mismatch")
+	}
+
+	for i := range src {
+		if err := storeInterfaces(src[i], dest[i]); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func storeInterfaces(src, dest interface{}) error {
+	return store(reflect.ValueOf(dest), reflect.ValueOf(src))
+}
+
+func store(dest, src reflect.Value) error {
+	if dest.Kind() == reflect.Ptr {
+		return store(dest.Elem(), src)
+	}
+	switch src.Kind() {
+	case reflect.Slice:
+		return storeSlice(dest, src)
+	case reflect.Map:
+		return storeMap(dest, src)
+	default:
+		return storeBase(dest, src)
+	}
+}
+
+func storeBase(dest, src reflect.Value) error {
+	return setDest(dest, src)
+}
+
+func setDest(dest, src reflect.Value) error {
+	if !isVariant(src.Type()) && isVariant(dest.Type()) {
+		//special conversion for dbus.Variant
+		dest.Set(reflect.ValueOf(MakeVariant(src.Interface())))
+		return nil
+	}
+	if isVariant(src.Type()) && !isVariant(dest.Type()) {
+		src = getVariantValue(src)
+	}
+	if !src.Type().ConvertibleTo(dest.Type()) {
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: cannot convert %s to %s",
+			src.Type(), dest.Type())
+	}
+	dest.Set(src.Convert(dest.Type()))
+	return nil
+}
+
+func kindsAreCompatible(dest, src reflect.Type) bool {
+	switch {
+	case isVariant(dest):
+		return true
+	case dest.Kind() == reflect.Interface:
+		return true
+	default:
+		return dest.Kind() == src.Kind()
+	}
+}
+
+func isConvertibleTo(dest, src reflect.Type) bool {
+	switch {
+	case isVariant(dest):
+		return true
+	case dest.Kind() == reflect.Interface:
+		return true
+	case dest.Kind() == reflect.Slice:
+		return src.Kind() == reflect.Slice &&
+			isConvertibleTo(dest.Elem(), src.Elem())
+	case dest.Kind() == reflect.Struct:
+		return src == interfacesType
+	default:
+		return src.ConvertibleTo(dest)
+	}
+}
+
+func storeMap(dest, src reflect.Value) error {
+	switch {
+	case !kindsAreCompatible(dest.Type(), src.Type()):
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: "+
+				"map: cannot store a value of %s into %s",
+			src.Type(), dest.Type())
+	case isVariant(dest.Type()):
+		return storeMapIntoVariant(dest, src)
+	case dest.Kind() == reflect.Interface:
+		return storeMapIntoInterface(dest, src)
+	case isConvertibleTo(dest.Type().Key(), src.Type().Key()) &&
+		isConvertibleTo(dest.Type().Elem(), src.Type().Elem()):
+		return storeMapIntoMap(dest, src)
+	default:
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: "+
+				"map: cannot convert a value of %s into %s",
+			src.Type(), dest.Type())
+	}
+}
+
+func storeMapIntoVariant(dest, src reflect.Value) error {
+	dv := reflect.MakeMap(src.Type())
+	err := store(dv, src)
+	if err != nil {
+		return err
+	}
+	return storeBase(dest, dv)
+}
+
+func storeMapIntoInterface(dest, src reflect.Value) error {
+	var dv reflect.Value
+	if isVariant(src.Type().Elem()) {
+		//Convert variants to interface{} recursively when converting
+		//to interface{}
+		dv = reflect.MakeMap(
+			reflect.MapOf(src.Type().Key(), interfaceType))
+	} else {
+		dv = reflect.MakeMap(src.Type())
+	}
+	err := store(dv, src)
+	if err != nil {
+		return err
+	}
+	return storeBase(dest, dv)
+}
+
+func storeMapIntoMap(dest, src reflect.Value) error {
+	if dest.IsNil() {
+		dest.Set(reflect.MakeMap(dest.Type()))
+	}
+	keys := src.MapKeys()
+	for _, key := range keys {
+		dkey := key.Convert(dest.Type().Key())
+		dval := reflect.New(dest.Type().Elem()).Elem()
+		err := store(dval, getVariantValue(src.MapIndex(key)))
+		if err != nil {
+			return err
+		}
+		dest.SetMapIndex(dkey, dval)
+	}
+	return nil
+}
+
+func storeSlice(dest, src reflect.Value) error {
+	switch {
+	case src.Type() == interfacesType && dest.Kind() == reflect.Struct:
+		//The decoder always decodes structs as slices of interface{}
+		return storeStruct(dest, src)
+	case !kindsAreCompatible(dest.Type(), src.Type()):
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: "+
+				"slice: cannot store a value of %s into %s",
+			src.Type(), dest.Type())
+	case isVariant(dest.Type()):
+		return storeSliceIntoVariant(dest, src)
+	case dest.Kind() == reflect.Interface:
+		return storeSliceIntoInterface(dest, src)
+	case isConvertibleTo(dest.Type().Elem(), src.Type().Elem()):
+		return storeSliceIntoSlice(dest, src)
+	default:
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: "+
+				"slice: cannot convert a value of %s into %s",
+			src.Type(), dest.Type())
+	}
+}
+
+func storeStruct(dest, src reflect.Value) error {
+	if isVariant(dest.Type()) {
+		return storeBase(dest, src)
+	}
+	dval := make([]interface{}, 0, dest.NumField())
+	dtype := dest.Type()
+	for i := 0; i < dest.NumField(); i++ {
+		field := dest.Field(i)
+		ftype := dtype.Field(i)
+		if ftype.PkgPath != "" {
+			continue
+		}
+		if ftype.Tag.Get("dbus") == "-" {
+			continue
+		}
+		dval = append(dval, field.Addr().Interface())
+	}
+	if src.Len() != len(dval) {
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: "+
+				"destination struct does not have "+
+				"enough fields need: %d have: %d",
+			src.Len(), len(dval))
+	}
+	return Store(src.Interface().([]interface{}), dval...)
+}
+
+func storeSliceIntoVariant(dest, src reflect.Value) error {
+	dv := reflect.MakeSlice(src.Type(), src.Len(), src.Cap())
+	err := store(dv, src)
+	if err != nil {
+		return err
+	}
+	return storeBase(dest, dv)
+}
+
+func storeSliceIntoInterface(dest, src reflect.Value) error {
+	var dv reflect.Value
+	if isVariant(src.Type().Elem()) {
+		//Convert variants to interface{} recursively when converting
+		//to interface{}
+		dv = reflect.MakeSlice(reflect.SliceOf(interfaceType),
+			src.Len(), src.Cap())
+	} else {
+		dv = reflect.MakeSlice(src.Type(), src.Len(), src.Cap())
+	}
+	err := store(dv, src)
+	if err != nil {
+		return err
+	}
+	return storeBase(dest, dv)
+}
+
+func storeSliceIntoSlice(dest, src reflect.Value) error {
+	if dest.IsNil() || dest.Len() < src.Len() {
+		dest.Set(reflect.MakeSlice(dest.Type(), src.Len(), src.Cap()))
+	}
+	if dest.Len() != src.Len() {
+		return fmt.Errorf(
+			"dbus.Store: type mismatch: "+
+				"slices are different lengths "+
+				"need: %d have: %d",
+			src.Len(), dest.Len())
+	}
+	for i := 0; i < src.Len(); i++ {
+		err := store(dest.Index(i), getVariantValue(src.Index(i)))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func getVariantValue(in reflect.Value) reflect.Value {
+	if isVariant(in.Type()) {
+		return reflect.ValueOf(in.Interface().(Variant).Value())
+	}
+	return in
+}
+
+func isVariant(t reflect.Type) bool {
+	return t == variantType
+}
+
+// An ObjectPath is an object path as defined by the D-Bus spec.
+type ObjectPath string
+
+// IsValid returns whether the object path is valid.
+func (o ObjectPath) IsValid() bool {
+	s := string(o)
+	if len(s) == 0 {
+		return false
+	}
+	if s[0] != '/' {
+		return false
+	}
+	if s[len(s)-1] == '/' && len(s) != 1 {
+		return false
+	}
+	// probably not used, but technically possible
+	if s == "/" {
+		return true
+	}
+	split := strings.Split(s[1:], "/")
+	for _, v := range split {
+		if len(v) == 0 {
+			return false
+		}
+		for _, c := range v {
+			if !isMemberChar(c) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+// A UnixFD is a Unix file descriptor sent over the wire. See the package-level
+// documentation for more information about Unix file descriptor passsing.
+type UnixFD int32
+
+// A UnixFDIndex is the representation of a Unix file descriptor in a message.
+type UnixFDIndex uint32
+
+// alignment returns the alignment of values of type t.
+func alignment(t reflect.Type) int {
+	switch t {
+	case variantType:
+		return 1
+	case objectPathType:
+		return 4
+	case signatureType:
+		return 1
+	case interfacesType:
+		return 4
+	}
+	switch t.Kind() {
+	case reflect.Uint8:
+		return 1
+	case reflect.Uint16, reflect.Int16:
+		return 2
+	case reflect.Uint, reflect.Int, reflect.Uint32, reflect.Int32, reflect.String, reflect.Array, reflect.Slice, reflect.Map:
+		return 4
+	case reflect.Uint64, reflect.Int64, reflect.Float64, reflect.Struct:
+		return 8
+	case reflect.Ptr:
+		return alignment(t.Elem())
+	}
+	return 1
+}
+
+// isKeyType returns whether t is a valid type for a D-Bus dict.
+func isKeyType(t reflect.Type) bool {
+	switch t.Kind() {
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+		reflect.Int16, reflect.Int32, reflect.Int64, reflect.Float64,
+		reflect.String, reflect.Uint, reflect.Int:
+
+		return true
+	}
+	return false
+}
+
+// isValidInterface returns whether s is a valid name for an interface.
+func isValidInterface(s string) bool {
+	if len(s) == 0 || len(s) > 255 || s[0] == '.' {
+		return false
+	}
+	elem := strings.Split(s, ".")
+	if len(elem) < 2 {
+		return false
+	}
+	for _, v := range elem {
+		if len(v) == 0 {
+			return false
+		}
+		if v[0] >= '0' && v[0] <= '9' {
+			return false
+		}
+		for _, c := range v {
+			if !isMemberChar(c) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+// isValidMember returns whether s is a valid name for a member.
+func isValidMember(s string) bool {
+	if len(s) == 0 || len(s) > 255 {
+		return false
+	}
+	i := strings.Index(s, ".")
+	if i != -1 {
+		return false
+	}
+	if s[0] >= '0' && s[0] <= '9' {
+		return false
+	}
+	for _, c := range s {
+		if !isMemberChar(c) {
+			return false
+		}
+	}
+	return true
+}
+
+func isMemberChar(c rune) bool {
+	return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') ||
+		(c >= 'a' && c <= 'z') || c == '_'
+}

vendor/github.com/godbus/dbus/decoder.go

@@ -0,0 +1,228 @@
+package dbus
+
+import (
+	"encoding/binary"
+	"io"
+	"reflect"
+)
+
+type decoder struct {
+	in    io.Reader
+	order binary.ByteOrder
+	pos   int
+}
+
+// newDecoder returns a new decoder that reads values from in. The input is
+// expected to be in the given byte order.
+func newDecoder(in io.Reader, order binary.ByteOrder) *decoder {
+	dec := new(decoder)
+	dec.in = in
+	dec.order = order
+	return dec
+}
+
+// align aligns the input to the given boundary and panics on error.
+func (dec *decoder) align(n int) {
+	if dec.pos%n != 0 {
+		newpos := (dec.pos + n - 1) & ^(n - 1)
+		empty := make([]byte, newpos-dec.pos)
+		if _, err := io.ReadFull(dec.in, empty); err != nil {
+			panic(err)
+		}
+		dec.pos = newpos
+	}
+}
+
+// Calls binary.Read(dec.in, dec.order, v) and panics on read errors.
+func (dec *decoder) binread(v interface{}) {
+	if err := binary.Read(dec.in, dec.order, v); err != nil {
+		panic(err)
+	}
+}
+
+func (dec *decoder) Decode(sig Signature) (vs []interface{}, err error) {
+	defer func() {
+		var ok bool
+		v := recover()
+		if err, ok = v.(error); ok {
+			if err == io.EOF || err == io.ErrUnexpectedEOF {
+				err = FormatError("unexpected EOF")
+			}
+		}
+	}()
+	vs = make([]interface{}, 0)
+	s := sig.str
+	for s != "" {
+		err, rem := validSingle(s, 0)
+		if err != nil {
+			return nil, err
+		}
+		v := dec.decode(s[:len(s)-len(rem)], 0)
+		vs = append(vs, v)
+		s = rem
+	}
+	return vs, nil
+}
+
+func (dec *decoder) decode(s string, depth int) interface{} {
+	dec.align(alignment(typeFor(s)))
+	switch s[0] {
+	case 'y':
+		var b [1]byte
+		if _, err := dec.in.Read(b[:]); err != nil {
+			panic(err)
+		}
+		dec.pos++
+		return b[0]
+	case 'b':
+		i := dec.decode("u", depth).(uint32)
+		switch {
+		case i == 0:
+			return false
+		case i == 1:
+			return true
+		default:
+			panic(FormatError("invalid value for boolean"))
+		}
+	case 'n':
+		var i int16
+		dec.binread(&i)
+		dec.pos += 2
+		return i
+	case 'i':
+		var i int32
+		dec.binread(&i)
+		dec.pos += 4
+		return i
+	case 'x':
+		var i int64
+		dec.binread(&i)
+		dec.pos += 8
+		return i
+	case 'q':
+		var i uint16
+		dec.binread(&i)
+		dec.pos += 2
+		return i
+	case 'u':
+		var i uint32
+		dec.binread(&i)
+		dec.pos += 4
+		return i
+	case 't':
+		var i uint64
+		dec.binread(&i)
+		dec.pos += 8
+		return i
+	case 'd':
+		var f float64
+		dec.binread(&f)
+		dec.pos += 8
+		return f
+	case 's':
+		length := dec.decode("u", depth).(uint32)
+		b := make([]byte, int(length)+1)
+		if _, err := io.ReadFull(dec.in, b); err != nil {
+			panic(err)
+		}
+		dec.pos += int(length) + 1
+		return string(b[:len(b)-1])
+	case 'o':
+		return ObjectPath(dec.decode("s", depth).(string))
+	case 'g':
+		length := dec.decode("y", depth).(byte)
+		b := make([]byte, int(length)+1)
+		if _, err := io.ReadFull(dec.in, b); err != nil {
+			panic(err)
+		}
+		dec.pos += int(length) + 1
+		sig, err := ParseSignature(string(b[:len(b)-1]))
+		if err != nil {
+			panic(err)
+		}
+		return sig
+	case 'v':
+		if depth >= 64 {
+			panic(FormatError("input exceeds container depth limit"))
+		}
+		var variant Variant
+		sig := dec.decode("g", depth).(Signature)
+		if len(sig.str) == 0 {
+			panic(FormatError("variant signature is empty"))
+		}
+		err, rem := validSingle(sig.str, 0)
+		if err != nil {
+			panic(err)
+		}
+		if rem != "" {
+			panic(FormatError("variant signature has multiple types"))
+		}
+		variant.sig = sig
+		variant.value = dec.decode(sig.str, depth+1)
+		return variant
+	case 'h':
+		return UnixFDIndex(dec.decode("u", depth).(uint32))
+	case 'a':
+		if len(s) > 1 && s[1] == '{' {
+			ksig := s[2:3]
+			vsig := s[3 : len(s)-1]
+			v := reflect.MakeMap(reflect.MapOf(typeFor(ksig), typeFor(vsig)))
+			if depth >= 63 {
+				panic(FormatError("input exceeds container depth limit"))
+			}
+			length := dec.decode("u", depth).(uint32)
+			// Even for empty maps, the correct padding must be included
+			dec.align(8)
+			spos := dec.pos
+			for dec.pos < spos+int(length) {
+				dec.align(8)
+				if !isKeyType(v.Type().Key()) {
+					panic(InvalidTypeError{v.Type()})
+				}
+				kv := dec.decode(ksig, depth+2)
+				vv := dec.decode(vsig, depth+2)
+				v.SetMapIndex(reflect.ValueOf(kv), reflect.ValueOf(vv))
+			}
+			return v.Interface()
+		}
+		if depth >= 64 {
+			panic(FormatError("input exceeds container depth limit"))
+		}
+		length := dec.decode("u", depth).(uint32)
+		v := reflect.MakeSlice(reflect.SliceOf(typeFor(s[1:])), 0, int(length))
+		// Even for empty arrays, the correct padding must be included
+		dec.align(alignment(typeFor(s[1:])))
+		spos := dec.pos
+		for dec.pos < spos+int(length) {
+			ev := dec.decode(s[1:], depth+1)
+			v = reflect.Append(v, reflect.ValueOf(ev))
+		}
+		return v.Interface()
+	case '(':
+		if depth >= 64 {
+			panic(FormatError("input exceeds container depth limit"))
+		}
+		dec.align(8)
+		v := make([]interface{}, 0)
+		s = s[1 : len(s)-1]
+		for s != "" {
+			err, rem := validSingle(s, 0)
+			if err != nil {
+				panic(err)
+			}
+			ev := dec.decode(s[:len(s)-len(rem)], depth+1)
+			v = append(v, ev)
+			s = rem
+		}
+		return v
+	default:
+		panic(SignatureError{Sig: s})
+	}
+}
+
+// A FormatError is an error in the wire format.
+type FormatError string
+
+func (e FormatError) Error() string {
+	return "dbus: wire format error: " + string(e)
+}

vendor/github.com/godbus/dbus/default_handler.go

@@ -0,0 +1,291 @@
+package dbus
+
+import (
+	"bytes"
+	"reflect"
+	"strings"
+	"sync"
+)
+
+func newIntrospectIntf(h *defaultHandler) *exportedIntf {
+	methods := make(map[string]Method)
+	methods["Introspect"] = exportedMethod{
+		reflect.ValueOf(func(msg Message) (string, *Error) {
+			path := msg.Headers[FieldPath].value.(ObjectPath)
+			return h.introspectPath(path), nil
+		}),
+	}
+	return newExportedIntf(methods, true)
+}
+
+//NewDefaultHandler returns an instance of the default
+//call handler. This is useful if you want to implement only
+//one of the two handlers but not both.
+func NewDefaultHandler() *defaultHandler {
+	h := &defaultHandler{
+		objects:     make(map[ObjectPath]*exportedObj),
+		defaultIntf: make(map[string]*exportedIntf),
+	}
+	h.defaultIntf["org.freedesktop.DBus.Introspectable"] = newIntrospectIntf(h)
+	return h
+}
+
+type defaultHandler struct {
+	sync.RWMutex
+	objects     map[ObjectPath]*exportedObj
+	defaultIntf map[string]*exportedIntf
+}
+
+func (h *defaultHandler) PathExists(path ObjectPath) bool {
+	_, ok := h.objects[path]
+	return ok
+}
+
+func (h *defaultHandler) introspectPath(path ObjectPath) string {
+	subpath := make(map[string]struct{})
+	var xml bytes.Buffer
+	xml.WriteString("<node>")
+	for obj, _ := range h.objects {
+		p := string(path)
+		if p != "/" {
+			p += "/"
+		}
+		if strings.HasPrefix(string(obj), p) {
+			node_name := strings.Split(string(obj[len(p):]), "/")[0]
+			subpath[node_name] = struct{}{}
+		}
+	}
+	for s, _ := range subpath {
+		xml.WriteString("\n\t<node name=\"" + s + "\"/>")
+	}
+	xml.WriteString("\n</node>")
+	return xml.String()
+}
+
+func (h *defaultHandler) LookupObject(path ObjectPath) (ServerObject, bool) {
+	h.RLock()
+	defer h.RUnlock()
+	object, ok := h.objects[path]
+	if ok {
+		return object, ok
+	}
+
+	// If an object wasn't found for this exact path,
+	// look for a matching subtree registration
+	subtreeObject := newExportedObject()
+	path = path[:strings.LastIndex(string(path), "/")]
+	for len(path) > 0 {
+		object, ok = h.objects[path]
+		if ok {
+			for name, iface := range object.interfaces {
+				// Only include this handler if it registered for the subtree
+				if iface.isFallbackInterface() {
+					subtreeObject.interfaces[name] = iface
+				}
+			}
+			break
+		}
+
+		path = path[:strings.LastIndex(string(path), "/")]
+	}
+
+	for name, intf := range h.defaultIntf {
+		if _, exists := subtreeObject.interfaces[name]; exists {
+			continue
+		}
+		subtreeObject.interfaces[name] = intf
+	}
+
+	return subtreeObject, true
+}
+
+func (h *defaultHandler) AddObject(path ObjectPath, object *exportedObj) {
+	h.Lock()
+	h.objects[path] = object
+	h.Unlock()
+}
+
+func (h *defaultHandler) DeleteObject(path ObjectPath) {
+	h.Lock()
+	delete(h.objects, path)
+	h.Unlock()
+}
+
+type exportedMethod struct {
+	reflect.Value
+}
+
+func (m exportedMethod) Call(args ...interface{}) ([]interface{}, error) {
+	t := m.Type()
+
+	params := make([]reflect.Value, len(args))
+	for i := 0; i < len(args); i++ {
+		params[i] = reflect.ValueOf(args[i]).Elem()
+	}
+
+	ret := m.Value.Call(params)
+
+	err := ret[t.NumOut()-1].Interface().(*Error)
+	ret = ret[:t.NumOut()-1]
+	out := make([]interface{}, len(ret))
+	for i, val := range ret {
+		out[i] = val.Interface()
+	}
+	if err == nil {
+		//concrete type to interface nil is a special case
+		return out, nil
+	}
+	return out, err
+}
+
+func (m exportedMethod) NumArguments() int {
+	return m.Value.Type().NumIn()
+}
+
+func (m exportedMethod) ArgumentValue(i int) interface{} {
+	return reflect.Zero(m.Type().In(i)).Interface()
+}
+
+func (m exportedMethod) NumReturns() int {
+	return m.Value.Type().NumOut()
+}
+
+func (m exportedMethod) ReturnValue(i int) interface{} {
+	return reflect.Zero(m.Type().Out(i)).Interface()
+}
+
+func newExportedObject() *exportedObj {
+	return &exportedObj{
+		interfaces: make(map[string]*exportedIntf),
+	}
+}
+
+type exportedObj struct {
+	interfaces map[string]*exportedIntf
+}
+
+func (obj *exportedObj) LookupInterface(name string) (Interface, bool) {
+	if name == "" {
+		return obj, true
+	}
+	intf, exists := obj.interfaces[name]
+	return intf, exists
+}
+
+func (obj *exportedObj) AddInterface(name string, iface *exportedIntf) {
+	obj.interfaces[name] = iface
+}
+
+func (obj *exportedObj) DeleteInterface(name string) {
+	delete(obj.interfaces, name)
+}
+
+func (obj *exportedObj) LookupMethod(name string) (Method, bool) {
+	for _, intf := range obj.interfaces {
+		method, exists := intf.LookupMethod(name)
+		if exists {
+			return method, exists
+		}
+	}
+	return nil, false
+}
+
+func (obj *exportedObj) isFallbackInterface() bool {
+	return false
+}
+
+func newExportedIntf(methods map[string]Method, includeSubtree bool) *exportedIntf {
+	return &exportedIntf{
+		methods:        methods,
+		includeSubtree: includeSubtree,
+	}
+}
+
+type exportedIntf struct {
+	methods map[string]Method
+
+	// Whether or not this export is for the entire subtree
+	includeSubtree bool
+}
+
+func (obj *exportedIntf) LookupMethod(name string) (Method, bool) {
+	out, exists := obj.methods[name]
+	return out, exists
+}
+
+func (obj *exportedIntf) isFallbackInterface() bool {
+	return obj.includeSubtree
+}
+
+//NewDefaultSignalHandler returns an instance of the default
+//signal handler. This is useful if you want to implement only
+//one of the two handlers but not both.
+func NewDefaultSignalHandler() *defaultSignalHandler {
+	return &defaultSignalHandler{}
+}
+
+func isDefaultSignalHandler(handler SignalHandler) bool {
+	_, ok := handler.(*defaultSignalHandler)
+	return ok
+}
+
+type defaultSignalHandler struct {
+	sync.RWMutex
+	closed  bool
+	signals []chan<- *Signal
+}
+
+func (sh *defaultSignalHandler) DeliverSignal(intf, name string, signal *Signal) {
+	go func() {
+		sh.RLock()
+		defer sh.RUnlock()
+		if sh.closed {
+			return
+		}
+		for _, ch := range sh.signals {
+			ch <- signal
+		}
+	}()
+}
+
+func (sh *defaultSignalHandler) Init() error {
+	sh.Lock()
+	sh.signals = make([]chan<- *Signal, 0)
+	sh.Unlock()
+	return nil
+}
+
+func (sh *defaultSignalHandler) Terminate() {
+	sh.Lock()
+	sh.closed = true
+	for _, ch := range sh.signals {
+		close(ch)
+	}
+	sh.signals = nil
+	sh.Unlock()
+}
+
+func (sh *defaultSignalHandler) addSignal(ch chan<- *Signal) {
+	sh.Lock()
+	defer sh.Unlock()
+	if sh.closed {
+		return
+	}
+	sh.signals = append(sh.signals, ch)
+
+}
+
+func (sh *defaultSignalHandler) removeSignal(ch chan<- *Signal) {
+	sh.Lock()
+	defer sh.Unlock()
+	if sh.closed {
+		return
+	}
+	for i := len(sh.signals) - 1; i >= 0; i-- {
+		if ch == sh.signals[i] {
+			copy(sh.signals[i:], sh.signals[i+1:])
+			sh.signals[len(sh.signals)-1] = nil
+			sh.signals = sh.signals[:len(sh.signals)-1]
+		}
+	}
+}

vendor/github.com/godbus/dbus/doc.go

@@ -0,0 +1,69 @@
+/*
+Package dbus implements bindings to the D-Bus message bus system.
+
+To use the message bus API, you first need to connect to a bus (usually the
+session or system bus). The acquired connection then can be used to call methods
+on remote objects and emit or receive signals. Using the Export method, you can
+arrange D-Bus methods calls to be directly translated to method calls on a Go
+value.
+
+Conversion Rules
+
+For outgoing messages, Go types are automatically converted to the
+corresponding D-Bus types. The following types are directly encoded as their
+respective D-Bus equivalents:
+
+     Go type     | D-Bus type
+     ------------+-----------
+     byte        | BYTE
+     bool        | BOOLEAN
+     int16       | INT16
+     uint16      | UINT16
+     int         | INT32
+     uint        | UINT32
+     int32       | INT32
+     uint32      | UINT32
+     int64       | INT64
+     uint64      | UINT64
+     float64     | DOUBLE
+     string      | STRING
+     ObjectPath  | OBJECT_PATH
+     Signature   | SIGNATURE
+     Variant     | VARIANT
+     interface{} | VARIANT
+     UnixFDIndex | UNIX_FD
+
+Slices and arrays encode as ARRAYs of their element type.
+
+Maps encode as DICTs, provided that their key type can be used as a key for
+a DICT.
+
+Structs other than Variant and Signature encode as a STRUCT containing their
+exported fields. Fields whose tags contain `dbus:"-"` and unexported fields will
+be skipped.
+
+Pointers encode as the value they're pointed to.
+
+Types convertible to one of the base types above will be mapped as the
+base type.
+
+Trying to encode any other type or a slice, map or struct containing an
+unsupported type will result in an InvalidTypeError.
+
+For incoming messages, the inverse of these rules are used, with the exception
+of STRUCTs. Incoming STRUCTS are represented as a slice of empty interfaces
+containing the struct fields in the correct order. The Store function can be
+used to convert such values to Go structs.
+
+Unix FD passing
+
+Handling Unix file descriptors deserves special mention. To use them, you should
+first check that they are supported on a connection by calling SupportsUnixFDs.
+If it returns true, all method of Connection will translate messages containing
+UnixFD's to messages that are accompanied by the given file descriptors with the
+UnixFD values being substituted by the correct indices. Similarily, the indices
+of incoming messages are automatically resolved. It shouldn't be necessary to use
+UnixFDIndex.
+
+*/
+package dbus

vendor/github.com/godbus/dbus/encoder.go

@@ -0,0 +1,210 @@
+package dbus
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"reflect"
+)
+
+// An encoder encodes values to the D-Bus wire format.
+type encoder struct {
+	out   io.Writer
+	order binary.ByteOrder
+	pos   int
+}
+
+// NewEncoder returns a new encoder that writes to out in the given byte order.
+func newEncoder(out io.Writer, order binary.ByteOrder) *encoder {
+	return newEncoderAtOffset(out, 0, order)
+}
+
+// newEncoderAtOffset returns a new encoder that writes to out in the given
+// byte order. Specify the offset to initialize pos for proper alignment
+// computation.
+func newEncoderAtOffset(out io.Writer, offset int, order binary.ByteOrder) *encoder {
+	enc := new(encoder)
+	enc.out = out
+	enc.order = order
+	enc.pos = offset
+	return enc
+}
+
+// Aligns the next output to be on a multiple of n. Panics on write errors.
+func (enc *encoder) align(n int) {
+	pad := enc.padding(0, n)
+	if pad > 0 {
+		empty := make([]byte, pad)
+		if _, err := enc.out.Write(empty); err != nil {
+			panic(err)
+		}
+		enc.pos += pad
+	}
+}
+
+// pad returns the number of bytes of padding, based on current position and additional offset.
+// and alignment.
+func (enc *encoder) padding(offset, algn int) int {
+	abs := enc.pos + offset
+	if abs%algn != 0 {
+		newabs := (abs + algn - 1) & ^(algn - 1)
+		return newabs - abs
+	}
+	return 0
+}
+
+// Calls binary.Write(enc.out, enc.order, v) and panics on write errors.
+func (enc *encoder) binwrite(v interface{}) {
+	if err := binary.Write(enc.out, enc.order, v); err != nil {
+		panic(err)
+	}
+}
+
+// Encode encodes the given values to the underyling reader. All written values
+// are aligned properly as required by the D-Bus spec.
+func (enc *encoder) Encode(vs ...interface{}) (err error) {
+	defer func() {
+		err, _ = recover().(error)
+	}()
+	for _, v := range vs {
+		enc.encode(reflect.ValueOf(v), 0)
+	}
+	return nil
+}
+
+// encode encodes the given value to the writer and panics on error. depth holds
+// the depth of the container nesting.
+func (enc *encoder) encode(v reflect.Value, depth int) {
+	enc.align(alignment(v.Type()))
+	switch v.Kind() {
+	case reflect.Uint8:
+		var b [1]byte
+		b[0] = byte(v.Uint())
+		if _, err := enc.out.Write(b[:]); err != nil {
+			panic(err)
+		}
+		enc.pos++
+	case reflect.Bool:
+		if v.Bool() {
+			enc.encode(reflect.ValueOf(uint32(1)), depth)
+		} else {
+			enc.encode(reflect.ValueOf(uint32(0)), depth)
+		}
+	case reflect.Int16:
+		enc.binwrite(int16(v.Int()))
+		enc.pos += 2
+	case reflect.Uint16:
+		enc.binwrite(uint16(v.Uint()))
+		enc.pos += 2
+	case reflect.Int, reflect.Int32:
+		enc.binwrite(int32(v.Int()))
+		enc.pos += 4
+	case reflect.Uint, reflect.Uint32:
+		enc.binwrite(uint32(v.Uint()))
+		enc.pos += 4
+	case reflect.Int64:
+		enc.binwrite(v.Int())
+		enc.pos += 8
+	case reflect.Uint64:
+		enc.binwrite(v.Uint())
+		enc.pos += 8
+	case reflect.Float64:
+		enc.binwrite(v.Float())
+		enc.pos += 8
+	case reflect.String:
+		enc.encode(reflect.ValueOf(uint32(len(v.String()))), depth)
+		b := make([]byte, v.Len()+1)
+		copy(b, v.String())
+		b[len(b)-1] = 0
+		n, err := enc.out.Write(b)
+		if err != nil {
+			panic(err)
+		}
+		enc.pos += n
+	case reflect.Ptr:
+		enc.encode(v.Elem(), depth)
+	case reflect.Slice, reflect.Array:
+		if depth >= 64 {
+			panic(FormatError("input exceeds container depth limit"))
+		}
+		// Lookahead offset: 4 bytes for uint32 length (with alignment),
+		// plus alignment for elements.
+		n := enc.padding(0, 4) + 4
+		offset := enc.pos + n + enc.padding(n, alignment(v.Type().Elem()))
+
+		var buf bytes.Buffer
+		bufenc := newEncoderAtOffset(&buf, offset, enc.order)
+
+		for i := 0; i < v.Len(); i++ {
+			bufenc.encode(v.Index(i), depth+1)
+		}
+		enc.encode(reflect.ValueOf(uint32(buf.Len())), depth)
+		length := buf.Len()
+		enc.align(alignment(v.Type().Elem()))
+		if _, err := buf.WriteTo(enc.out); err != nil {
+			panic(err)
+		}
+		enc.pos += length
+	case reflect.Struct:
+		if depth >= 64 && v.Type() != signatureType {
+			panic(FormatError("input exceeds container depth limit"))
+		}
+		switch t := v.Type(); t {
+		case signatureType:
+			str := v.Field(0)
+			enc.encode(reflect.ValueOf(byte(str.Len())), depth+1)
+			b := make([]byte, str.Len()+1)
+			copy(b, str.String())
+			b[len(b)-1] = 0
+			n, err := enc.out.Write(b)
+			if err != nil {
+				panic(err)
+			}
+			enc.pos += n
+		case variantType:
+			variant := v.Interface().(Variant)
+			enc.encode(reflect.ValueOf(variant.sig), depth+1)
+			enc.encode(reflect.ValueOf(variant.value), depth+1)
+		default:
+			for i := 0; i < v.Type().NumField(); i++ {
+				field := t.Field(i)
+				if field.PkgPath == "" && field.Tag.Get("dbus") != "-" {
+					enc.encode(v.Field(i), depth+1)
+				}
+			}
+		}
+	case reflect.Map:
+		// Maps are arrays of structures, so they actually increase the depth by
+		// 2.
+		if depth >= 63 {
+			panic(FormatError("input exceeds container depth limit"))
+		}
+		if !isKeyType(v.Type().Key()) {
+			panic(InvalidTypeError{v.Type()})
+		}
+		keys := v.MapKeys()
+		// Lookahead offset: 4 bytes for uint32 length (with alignment),
+		// plus 8-byte alignment
+		n := enc.padding(0, 4) + 4
+		offset := enc.pos + n + enc.padding(n, 8)
+
+		var buf bytes.Buffer
+		bufenc := newEncoderAtOffset(&buf, offset, enc.order)
+		for _, k := range keys {
+			bufenc.align(8)
+			bufenc.encode(k, depth+2)
+			bufenc.encode(v.MapIndex(k), depth+2)
+		}
+		enc.encode(reflect.ValueOf(uint32(buf.Len())), depth)
+		length := buf.Len()
+		enc.align(8)
+		if _, err := buf.WriteTo(enc.out); err != nil {
+			panic(err)
+		}
+		enc.pos += length
+	case reflect.Interface:
+		enc.encode(reflect.ValueOf(MakeVariant(v.Interface())), depth)
+	default:
+		panic(InvalidTypeError{v.Type()})
+	}
+}

vendor/github.com/godbus/dbus/encoder_test.go

@@ -0,0 +1,414 @@
+package dbus
+
+import (
+	"bytes"
+	"encoding/binary"
+	"reflect"
+	"testing"
+)
+
+func TestEncodeArrayOfMaps(t *testing.T) {
+	tests := []struct {
+		name string
+		vs   []interface{}
+	}{
+		{
+			"aligned at 8 at start of array",
+			[]interface{}{
+				"12345",
+				[]map[string]Variant{
+					{
+						"abcdefg": MakeVariant("foo"),
+						"cdef":    MakeVariant(uint32(2)),
+					},
+				},
+			},
+		},
+		{
+			"not aligned at 8 for start of array",
+			[]interface{}{
+				"1234567890",
+				[]map[string]Variant{
+					{
+						"abcdefg": MakeVariant("foo"),
+						"cdef":    MakeVariant(uint32(2)),
+					},
+				},
+			},
+		},
+	}
+	for _, order := range []binary.ByteOrder{binary.LittleEndian, binary.BigEndian} {
+		for _, tt := range tests {
+			buf := new(bytes.Buffer)
+			enc := newEncoder(buf, order)
+			enc.Encode(tt.vs...)
+
+			dec := newDecoder(buf, order)
+			v, err := dec.Decode(SignatureOf(tt.vs...))
+			if err != nil {
+				t.Errorf("%q: decode (%v) failed: %v", tt.name, order, err)
+				continue
+			}
+			if !reflect.DeepEqual(v, tt.vs) {
+				t.Errorf("%q: (%v) not equal: got '%v', want '%v'", tt.name, order, v, tt.vs)
+				continue
+			}
+		}
+	}
+}
+
+func TestEncodeMapStringInterface(t *testing.T) {
+	val := map[string]interface{}{"foo": "bar"}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := map[string]interface{}{}
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+type empty interface{}
+
+func TestEncodeMapStringNamedInterface(t *testing.T) {
+	val := map[string]empty{"foo": "bar"}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := map[string]empty{}
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+type fooer interface {
+	Foo()
+}
+
+type fooimpl string
+
+func (fooimpl) Foo() {}
+
+func TestEncodeMapStringNonEmptyInterface(t *testing.T) {
+	val := map[string]fooer{"foo": fooimpl("bar")}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := map[string]fooer{}
+	err = Store(v, &out)
+	if err == nil {
+		t.Fatal("Shouldn't be able to convert to non empty interfaces")
+	}
+}
+
+func TestEncodeSliceInterface(t *testing.T) {
+	val := []interface{}{"foo", "bar"}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := []interface{}{}
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+func TestEncodeSliceNamedInterface(t *testing.T) {
+	val := []empty{"foo", "bar"}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := []empty{}
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+func TestEncodeNestedInterface(t *testing.T) {
+	val := map[string]interface{}{
+		"foo": []interface{}{"1", "2", "3", "5",
+			map[string]interface{}{
+				"bar": "baz",
+			},
+		},
+		"bar": map[string]interface{}{
+			"baz":  "quux",
+			"quux": "quuz",
+		},
+	}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := map[string]interface{}{}
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%#v', want '%#v'",
+			out, val)
+	}
+}
+
+func TestEncodeInt(t *testing.T) {
+	val := 10
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var out int
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+func TestEncodeIntToNonCovertible(t *testing.T) {
+	val := 150
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var out bool
+	err = Store(v, &out)
+	if err == nil {
+		t.Logf("%q\n", out)
+		t.Fatal("Type mismatch should have occured")
+	}
+}
+
+func TestEncodeUint(t *testing.T) {
+	val := uint(10)
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var out uint
+	Store(v, &out)
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+func TestEncodeUintToNonCovertible(t *testing.T) {
+	val := uint(10)
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var out bool
+	err = Store(v, &out)
+	if err == nil {
+		t.Fatal("Type mismatch should have occured")
+	}
+}
+
+type boolean bool
+
+func TestEncodeOfAssignableType(t *testing.T) {
+	val := boolean(true)
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(val)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(val))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var out boolean
+	err = Store(v, &out)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(out, val) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			out, val)
+	}
+}
+
+func TestEncodeVariant(t *testing.T) {
+	var res map[ObjectPath]map[string]map[string]Variant
+	var src = map[ObjectPath]map[string]map[string]Variant{
+		ObjectPath("/foo/bar"): {
+			"foo": {
+				"bar": MakeVariant(10),
+				"baz": MakeVariant("20"),
+			},
+		},
+	}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(src))
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = Store(v, &res)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = res[ObjectPath("/foo/bar")]["foo"]["baz"].Value().(string)
+}
+
+func TestEncodeVariantToList(t *testing.T) {
+	var res map[string]Variant
+	var src = map[string]interface{}{
+		"foo": []interface{}{"a", "b", "c"},
+	}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(src))
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = Store(v, &res)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = res["foo"].Value().([]Variant)
+}
+
+func TestEncodeVariantToUint64(t *testing.T) {
+	var res map[string]Variant
+	var src = map[string]interface{}{
+		"foo": uint64(10),
+	}
+	buf := new(bytes.Buffer)
+	order := binary.LittleEndian
+	enc := newEncoder(buf, binary.LittleEndian)
+	err := enc.Encode(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dec := newDecoder(buf, order)
+	v, err := dec.Decode(SignatureOf(src))
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = Store(v, &res)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = res["foo"].Value().(uint64)
+}

vendor/github.com/godbus/dbus/examples_test.go

@@ -0,0 +1,50 @@
+package dbus
+
+import "fmt"
+
+func ExampleConn_Emit() {
+	conn, err := SessionBus()
+	if err != nil {
+		panic(err)
+	}
+
+	conn.Emit("/foo/bar", "foo.bar.Baz", uint32(0xDAEDBEEF))
+}
+
+func ExampleObject_Call() {
+	var list []string
+
+	conn, err := SessionBus()
+	if err != nil {
+		panic(err)
+	}
+
+	err = conn.BusObject().Call("org.freedesktop.DBus.ListNames", 0).Store(&list)
+	if err != nil {
+		panic(err)
+	}
+	for _, v := range list {
+		fmt.Println(v)
+	}
+}
+
+func ExampleObject_Go() {
+	conn, err := SessionBus()
+	if err != nil {
+		panic(err)
+	}
+
+	ch := make(chan *Call, 10)
+	conn.BusObject().Go("org.freedesktop.DBus.ListActivatableNames", 0, ch)
+	select {
+	case call := <-ch:
+		if call.Err != nil {
+			panic(err)
+		}
+		list := call.Body[0].([]string)
+		for _, v := range list {
+			fmt.Println(v)
+		}
+		// put some other cases here
+	}
+}

vendor/github.com/godbus/dbus/export.go

@@ -0,0 +1,413 @@
+package dbus
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+var (
+	ErrMsgInvalidArg = Error{
+		"org.freedesktop.DBus.Error.InvalidArgs",
+		[]interface{}{"Invalid type / number of args"},
+	}
+	ErrMsgNoObject = Error{
+		"org.freedesktop.DBus.Error.NoSuchObject",
+		[]interface{}{"No such object"},
+	}
+	ErrMsgUnknownMethod = Error{
+		"org.freedesktop.DBus.Error.UnknownMethod",
+		[]interface{}{"Unknown / invalid method"},
+	}
+	ErrMsgUnknownInterface = Error{
+		"org.freedesktop.DBus.Error.UnknownInterface",
+		[]interface{}{"Object does not implement the interface"},
+	}
+)
+
+func MakeFailedError(err error) *Error {
+	return &Error{
+		"org.freedesktop.DBus.Error.Failed",
+		[]interface{}{err.Error()},
+	}
+}
+
+// Sender is a type which can be used in exported methods to receive the message
+// sender.
+type Sender string
+
+func computeMethodName(name string, mapping map[string]string) string {
+	newname, ok := mapping[name]
+	if ok {
+		name = newname
+	}
+	return name
+}
+
+func getMethods(in interface{}, mapping map[string]string) map[string]reflect.Value {
+	if in == nil {
+		return nil
+	}
+	methods := make(map[string]reflect.Value)
+	val := reflect.ValueOf(in)
+	typ := val.Type()
+	for i := 0; i < typ.NumMethod(); i++ {
+		methtype := typ.Method(i)
+		method := val.Method(i)
+		t := method.Type()
+		// only track valid methods must return *Error as last arg
+		// and must be exported
+		if t.NumOut() == 0 ||
+			t.Out(t.NumOut()-1) != reflect.TypeOf(&ErrMsgInvalidArg) ||
+			methtype.PkgPath != "" {
+			continue
+		}
+		// map names while building table
+		methods[computeMethodName(methtype.Name, mapping)] = method
+	}
+	return methods
+}
+
+func standardMethodArgumentDecode(m Method, sender string, msg *Message, body []interface{}) ([]interface{}, error) {
+	pointers := make([]interface{}, m.NumArguments())
+	decode := make([]interface{}, 0, len(body))
+
+	for i := 0; i < m.NumArguments(); i++ {
+		tp := reflect.TypeOf(m.ArgumentValue(i))
+		val := reflect.New(tp)
+		pointers[i] = val.Interface()
+		if tp == reflect.TypeOf((*Sender)(nil)).Elem() {
+			val.Elem().SetString(sender)
+		} else if tp == reflect.TypeOf((*Message)(nil)).Elem() {
+			val.Elem().Set(reflect.ValueOf(*msg))
+		} else {
+			decode = append(decode, pointers[i])
+		}
+	}
+
+	if len(decode) != len(body) {
+		return nil, ErrMsgInvalidArg
+	}
+
+	if err := Store(body, decode...); err != nil {
+		return nil, ErrMsgInvalidArg
+	}
+
+	return pointers, nil
+}
+
+func (conn *Conn) decodeArguments(m Method, sender string, msg *Message) ([]interface{}, error) {
+	if decoder, ok := m.(ArgumentDecoder); ok {
+		return decoder.DecodeArguments(conn, sender, msg, msg.Body)
+	}
+	return standardMethodArgumentDecode(m, sender, msg, msg.Body)
+}
+
+// handleCall handles the given method call (i.e. looks if it's one of the
+// pre-implemented ones and searches for a corresponding handler if not).
+func (conn *Conn) handleCall(msg *Message) {
+	name := msg.Headers[FieldMember].value.(string)
+	path := msg.Headers[FieldPath].value.(ObjectPath)
+	ifaceName, _ := msg.Headers[FieldInterface].value.(string)
+	sender, hasSender := msg.Headers[FieldSender].value.(string)
+	serial := msg.serial
+	if ifaceName == "org.freedesktop.DBus.Peer" {
+		switch name {
+		case "Ping":
+			conn.sendReply(sender, serial)
+		case "GetMachineId":
+			conn.sendReply(sender, serial, conn.uuid)
+		default:
+			conn.sendError(ErrMsgUnknownMethod, sender, serial)
+		}
+		return
+	}
+	if len(name) == 0 {
+		conn.sendError(ErrMsgUnknownMethod, sender, serial)
+	}
+
+	object, ok := conn.handler.LookupObject(path)
+	if !ok {
+		conn.sendError(ErrMsgNoObject, sender, serial)
+		return
+	}
+
+	iface, exists := object.LookupInterface(ifaceName)
+	if !exists {
+		conn.sendError(ErrMsgUnknownInterface, sender, serial)
+		return
+	}
+
+	m, exists := iface.LookupMethod(name)
+	if !exists {
+		conn.sendError(ErrMsgUnknownMethod, sender, serial)
+		return
+	}
+	args, err := conn.decodeArguments(m, sender, msg)
+	if err != nil {
+		conn.sendError(err, sender, serial)
+		return
+	}
+
+	ret, err := m.Call(args...)
+	if err != nil {
+		conn.sendError(err, sender, serial)
+		return
+	}
+
+	if msg.Flags&FlagNoReplyExpected == 0 {
+		reply := new(Message)
+		reply.Type = TypeMethodReply
+		reply.serial = conn.getSerial()
+		reply.Headers = make(map[HeaderField]Variant)
+		if hasSender {
+			reply.Headers[FieldDestination] = msg.Headers[FieldSender]
+		}
+		reply.Headers[FieldReplySerial] = MakeVariant(msg.serial)
+		reply.Body = make([]interface{}, len(ret))
+		for i := 0; i < len(ret); i++ {
+			reply.Body[i] = ret[i]
+		}
+		reply.Headers[FieldSignature] = MakeVariant(SignatureOf(reply.Body...))
+		conn.outLck.RLock()
+		if !conn.closed {
+			conn.out <- reply
+		}
+		conn.outLck.RUnlock()
+	}
+}
+
+// Emit emits the given signal on the message bus. The name parameter must be
+// formatted as "interface.member", e.g., "org.freedesktop.DBus.NameLost".
+func (conn *Conn) Emit(path ObjectPath, name string, values ...interface{}) error {
+	if !path.IsValid() {
+		return errors.New("dbus: invalid object path")
+	}
+	i := strings.LastIndex(name, ".")
+	if i == -1 {
+		return errors.New("dbus: invalid method name")
+	}
+	iface := name[:i]
+	member := name[i+1:]
+	if !isValidMember(member) {
+		return errors.New("dbus: invalid method name")
+	}
+	if !isValidInterface(iface) {
+		return errors.New("dbus: invalid interface name")
+	}
+	msg := new(Message)
+	msg.Type = TypeSignal
+	msg.serial = conn.getSerial()
+	msg.Headers = make(map[HeaderField]Variant)
+	msg.Headers[FieldInterface] = MakeVariant(iface)
+	msg.Headers[FieldMember] = MakeVariant(member)
+	msg.Headers[FieldPath] = MakeVariant(path)
+	msg.Body = values
+	if len(values) > 0 {
+		msg.Headers[FieldSignature] = MakeVariant(SignatureOf(values...))
+	}
+	conn.outLck.RLock()
+	defer conn.outLck.RUnlock()
+	if conn.closed {
+		return ErrClosed
+	}
+	conn.out <- msg
+	return nil
+}
+
+// Export registers the given value to be exported as an object on the
+// message bus.
+//
+// If a method call on the given path and interface is received, an exported
+// method with the same name is called with v as the receiver if the
+// parameters match and the last return value is of type *Error. If this
+// *Error is not nil, it is sent back to the caller as an error.
+// Otherwise, a method reply is sent with the other return values as its body.
+//
+// Any parameters with the special type Sender are set to the sender of the
+// dbus message when the method is called. Parameters of this type do not
+// contribute to the dbus signature of the method (i.e. the method is exposed
+// as if the parameters of type Sender were not there).
+//
+// Similarly, any parameters with the type Message are set to the raw message
+// received on the bus. Again, parameters of this type do not contribute to the
+// dbus signature of the method.
+//
+// Every method call is executed in a new goroutine, so the method may be called
+// in multiple goroutines at once.
+//
+// Method calls on the interface org.freedesktop.DBus.Peer will be automatically
+// handled for every object.
+//
+// Passing nil as the first parameter will cause conn to cease handling calls on
+// the given combination of path and interface.
+//
+// Export returns an error if path is not a valid path name.
+func (conn *Conn) Export(v interface{}, path ObjectPath, iface string) error {
+	return conn.ExportWithMap(v, nil, path, iface)
+}
+
+// ExportWithMap works exactly like Export but provides the ability to remap
+// method names (e.g. export a lower-case method).
+//
+// The keys in the map are the real method names (exported on the struct), and
+// the values are the method names to be exported on DBus.
+func (conn *Conn) ExportWithMap(v interface{}, mapping map[string]string, path ObjectPath, iface string) error {
+	return conn.export(getMethods(v, mapping), path, iface, false)
+}
+
+// ExportSubtree works exactly like Export but registers the given value for
+// an entire subtree rather under the root path provided.
+//
+// In order to make this useful, one parameter in each of the value's exported
+// methods should be a Message, in which case it will contain the raw message
+// (allowing one to get access to the path that caused the method to be called).
+//
+// Note that more specific export paths take precedence over less specific. For
+// example, a method call using the ObjectPath /foo/bar/baz will call a method
+// exported on /foo/bar before a method exported on /foo.
+func (conn *Conn) ExportSubtree(v interface{}, path ObjectPath, iface string) error {
+	return conn.ExportSubtreeWithMap(v, nil, path, iface)
+}
+
+// ExportSubtreeWithMap works exactly like ExportSubtree but provides the
+// ability to remap method names (e.g. export a lower-case method).
+//
+// The keys in the map are the real method names (exported on the struct), and
+// the values are the method names to be exported on DBus.
+func (conn *Conn) ExportSubtreeWithMap(v interface{}, mapping map[string]string, path ObjectPath, iface string) error {
+	return conn.export(getMethods(v, mapping), path, iface, true)
+}
+
+// ExportMethodTable like Export registers the given methods as an object
+// on the message bus. Unlike Export the it uses a method table to define
+// the object instead of a native go object.
+//
+// The method table is a map from method name to function closure
+// representing the method. This allows an object exported on the bus to not
+// necessarily be a native go object. It can be useful for generating exposed
+// methods on the fly.
+//
+// Any non-function objects in the method table are ignored.
+func (conn *Conn) ExportMethodTable(methods map[string]interface{}, path ObjectPath, iface string) error {
+	return conn.exportMethodTable(methods, path, iface, false)
+}
+
+// Like ExportSubtree, but with the same caveats as ExportMethodTable.
+func (conn *Conn) ExportSubtreeMethodTable(methods map[string]interface{}, path ObjectPath, iface string) error {
+	return conn.exportMethodTable(methods, path, iface, true)
+}
+
+func (conn *Conn) exportMethodTable(methods map[string]interface{}, path ObjectPath, iface string, includeSubtree bool) error {
+	out := make(map[string]reflect.Value)
+	for name, method := range methods {
+		rval := reflect.ValueOf(method)
+		if rval.Kind() != reflect.Func {
+			continue
+		}
+		t := rval.Type()
+		// only track valid methods must return *Error as last arg
+		if t.NumOut() == 0 ||
+			t.Out(t.NumOut()-1) != reflect.TypeOf(&ErrMsgInvalidArg) {
+			continue
+		}
+		out[name] = rval
+	}
+	return conn.export(out, path, iface, includeSubtree)
+}
+
+func (conn *Conn) unexport(h *defaultHandler, path ObjectPath, iface string) error {
+	if h.PathExists(path) {
+		obj := h.objects[path]
+		obj.DeleteInterface(iface)
+		if len(obj.interfaces) == 0 {
+			h.DeleteObject(path)
+		}
+	}
+	return nil
+}
+
+// exportWithMap is the worker function for all exports/registrations.
+func (conn *Conn) export(methods map[string]reflect.Value, path ObjectPath, iface string, includeSubtree bool) error {
+	h, ok := conn.handler.(*defaultHandler)
+	if !ok {
+		return fmt.Errorf(
+			`dbus: export only allowed on the default hander handler have %T"`,
+			conn.handler)
+	}
+
+	if !path.IsValid() {
+		return fmt.Errorf(`dbus: Invalid path name: "%s"`, path)
+	}
+
+	// Remove a previous export if the interface is nil
+	if methods == nil {
+		return conn.unexport(h, path, iface)
+	}
+
+	// If this is the first handler for this path, make a new map to hold all
+	// handlers for this path.
+	if !h.PathExists(path) {
+		h.AddObject(path, newExportedObject())
+	}
+
+	exportedMethods := make(map[string]Method)
+	for name, method := range methods {
+		exportedMethods[name] = exportedMethod{method}
+	}
+
+	// Finally, save this handler
+	obj := h.objects[path]
+	obj.AddInterface(iface, newExportedIntf(exportedMethods, includeSubtree))
+
+	return nil
+}
+
+// ReleaseName calls org.freedesktop.DBus.ReleaseName and awaits a response.
+func (conn *Conn) ReleaseName(name string) (ReleaseNameReply, error) {
+	var r uint32
+	err := conn.busObj.Call("org.freedesktop.DBus.ReleaseName", 0, name).Store(&r)
+	if err != nil {
+		return 0, err
+	}
+	return ReleaseNameReply(r), nil
+}
+
+// RequestName calls org.freedesktop.DBus.RequestName and awaits a response.
+func (conn *Conn) RequestName(name string, flags RequestNameFlags) (RequestNameReply, error) {
+	var r uint32
+	err := conn.busObj.Call("org.freedesktop.DBus.RequestName", 0, name, flags).Store(&r)
+	if err != nil {
+		return 0, err
+	}
+	return RequestNameReply(r), nil
+}
+
+// ReleaseNameReply is the reply to a ReleaseName call.
+type ReleaseNameReply uint32
+
+const (
+	ReleaseNameReplyReleased ReleaseNameReply = 1 + iota
+	ReleaseNameReplyNonExistent
+	ReleaseNameReplyNotOwner
+)
+
+// RequestNameFlags represents the possible flags for a RequestName call.
+type RequestNameFlags uint32
+
+const (
+	NameFlagAllowReplacement RequestNameFlags = 1 << iota
+	NameFlagReplaceExisting
+	NameFlagDoNotQueue
+)
+
+// RequestNameReply is the reply to a RequestName call.
+type RequestNameReply uint32
+
+const (
+	RequestNameReplyPrimaryOwner RequestNameReply = 1 + iota
+	RequestNameReplyInQueue
+	RequestNameReplyExists
+	RequestNameReplyAlreadyOwner
+)

vendor/github.com/godbus/dbus/export_test.go

@@ -0,0 +1,635 @@
+package dbus
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+type lowerCaseExport struct{}
+
+func (export lowerCaseExport) foo() (string, *Error) {
+	return "bar", nil
+}
+
+type fooExport struct {
+	message Message
+}
+
+func (export *fooExport) Foo(message Message, param string) (string, *Error) {
+	export.message = message
+	return "foo", nil
+}
+
+type barExport struct{}
+
+func (export barExport) Foo(param string) (string, *Error) {
+	return "bar", nil
+}
+
+type badExport struct{}
+
+func (export badExport) Foo(param string) string {
+	return "bar"
+}
+
+// Test typical Export usage.
+func TestExport(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	connection.Export(server{}, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+	subtreeObject := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response int64
+	err = object.Call("org.guelfey.DBus.Test.Double", 0, int64(2)).Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Double: %s", err)
+	}
+
+	if response != 4 {
+		t.Errorf("Response was %d, expected 4", response)
+	}
+
+	// Verify that calling a subtree of a regular export does not result in a
+	// valid method call.
+	err = subtreeObject.Call("org.guelfey.DBus.Test.Double", 0, int64(2)).Store(&response)
+	if err == nil {
+		t.Error("Expected error due to no object being exported on that path")
+	}
+
+	// Now remove export
+	connection.Export(nil, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.Double", 0, int64(2)).Store(&response)
+	if err == nil {
+		t.Error("Expected an error since the export was removed")
+	}
+}
+
+// Test that Exported handlers can obtain raw message.
+func TestExport_message(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	export := &fooExport{}
+	connection.Export(export, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected a valid message to be given to handler")
+	}
+}
+
+// Test Export with an invalid path.
+func TestExport_invalidPath(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	err = connection.Export(nil, "foo", "bar")
+	if err == nil {
+		t.Error("Expected an error due to exporting with an invalid path")
+	}
+}
+
+// Test Export with an un-exported method. This should not panic, but rather
+// result in an invalid method call.
+func TestExport_unexportedMethod(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	connection.Export(lowerCaseExport{}, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response string
+	call := object.Call("org.guelfey.DBus.Test.foo", 0)
+	err = call.Store(&response)
+	if err == nil {
+		t.Errorf("Expected an error due to calling unexported method")
+	}
+}
+
+// Test Export with a method lacking the correct return signature. This should
+// result in an invalid method call.
+func TestExport_badSignature(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	connection.Export(badExport{}, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response string
+	call := object.Call("org.guelfey.DBus.Test.Foo", 0)
+	err = call.Store(&response)
+	if err == nil {
+		t.Errorf("Expected an error due to the method lacking the right signature")
+	}
+}
+
+// Test typical ExportWithMap usage.
+func TestExportWithMap(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	mapping := make(map[string]string)
+	mapping["Double"] = "double" // Export this method as lower-case
+
+	connection.ExportWithMap(server{}, mapping, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response int64
+	err = object.Call("org.guelfey.DBus.Test.double", 0, int64(2)).Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling double: %s", err)
+	}
+
+	if response != 4 {
+		t.Errorf("Response was %d, expected 4", response)
+	}
+}
+
+// Test that ExportWithMap does not export both method alias and method.
+func TestExportWithMap_bypassAlias(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	mapping := make(map[string]string)
+	mapping["Double"] = "double" // Export this method as lower-case
+
+	connection.ExportWithMap(server{}, mapping, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response int64
+	// Call upper-case Double (i.e. the real method, not the alias)
+	err = object.Call("org.guelfey.DBus.Test.Double", 0, int64(2)).Store(&response)
+	if err == nil {
+		t.Error("Expected an error due to calling actual method, not alias")
+	}
+}
+
+// Test typical ExportSubtree usage.
+func TestExportSubtree(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	export := &fooExport{}
+	connection.ExportSubtree(export, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+
+	// Call a subpath of the exported path
+	object := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected the raw message, got an invalid one")
+	}
+
+	// Now remove export
+	connection.Export(nil, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err == nil {
+		t.Error("Expected an error since the export was removed")
+	}
+}
+
+// Test that using ExportSubtree with exported methods that don't contain a
+// Message still work, they just don't get the message.
+func TestExportSubtree_noMessage(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	connection.ExportSubtree(server{}, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+
+	// Call a subpath of the exported path
+	object := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response int64
+	err = object.Call("org.guelfey.DBus.Test.Double", 0, int64(2)).Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Double: %s", err)
+	}
+
+	if response != 4 {
+		t.Errorf("Response was %d, expected 4", response)
+	}
+
+	// Now remove export
+	connection.Export(nil, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.Double", 0, int64(2)).Store(&response)
+	if err == nil {
+		t.Error("Expected an error since the export was removed")
+	}
+}
+
+// Test that a regular Export takes precedence over ExportSubtree.
+func TestExportSubtree_exportPrecedence(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	// Register for the entire subtree of /org/guelfey/DBus/Test
+	connection.ExportSubtree(&fooExport{},
+		"/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+
+	// Explicitly register for /org/guelfey/DBus/Test/Foo, a subpath of above
+	connection.Export(&barExport{}, "/org/guelfey/DBus/Test/Foo",
+		"org.guelfey.DBus.Test")
+
+	// Call the explicitly exported path
+	object := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "bar" {
+		t.Errorf(`Response was %s, expected "bar"`, response)
+	}
+
+	response = "" // Reset response so errors aren't confusing
+
+	// Now remove explicit export
+	connection.Export(nil, "/org/guelfey/DBus/Test/Foo", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	// Now the subtree export should handle the call
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+}
+
+// Test typical ExportSubtreeWithMap usage.
+func TestExportSubtreeWithMap(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	mapping := make(map[string]string)
+	mapping["Foo"] = "foo" // Export this method as lower-case
+
+	connection.ExportSubtreeWithMap(&fooExport{}, mapping, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+
+	// Call a subpath of the exported path
+	object := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response string
+	// Call the lower-case method
+	err = object.Call("org.guelfey.DBus.Test.foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	// Now remove export
+	connection.Export(nil, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.foo", 0, "qux").Store(&response)
+	if err == nil {
+		t.Error("Expected an error since the export was removed")
+	}
+}
+
+// Test that ExportSubtreeWithMap does not export both method alias and method.
+func TestExportSubtreeWithMap_bypassAlias(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	mapping := make(map[string]string)
+	mapping["Foo"] = "foo" // Export this method as lower-case
+
+	connection.ExportSubtreeWithMap(&fooExport{}, mapping, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response string
+	// Call upper-case Foo (i.e. the real method, not the alias)
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err == nil {
+		t.Error("Expected an error due to calling actual method, not alias")
+	}
+}
+
+func TestExportMethodTable(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+	export := &fooExport{}
+	tbl := make(map[string]interface{})
+	tbl["Foo"] = func(message Message, param string) (string, *Error) {
+		return export.Foo(message, param)
+	}
+	tbl["Foo2"] = export.Foo
+	connection.ExportMethodTable(tbl, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected the raw message, got an invalid one")
+	}
+
+	err = object.Call("org.guelfey.DBus.Test.Foo2", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected the raw message, got an invalid one")
+	}
+
+	// Now remove export
+	connection.Export(nil, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err == nil {
+		t.Error("Expected an error since the export was removed")
+	}
+}
+
+func TestExportSubtreeMethodTable(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	export := &fooExport{}
+	tbl := make(map[string]interface{})
+	tbl["Foo"] = func(message Message, param string) (string, *Error) {
+		return export.Foo(message, param)
+	}
+	tbl["Foo2"] = export.Foo
+	connection.ExportSubtreeMethodTable(tbl, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+
+	// Call a subpath of the exported path
+	object := connection.Object(name, "/org/guelfey/DBus/Test/Foo")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected the raw message, got an invalid one")
+	}
+
+	err = object.Call("org.guelfey.DBus.Test.Foo2", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected the raw message, got an invalid one")
+	}
+
+	// Now remove export
+	connection.Export(nil, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err == nil {
+		t.Error("Expected an error since the export was removed")
+	}
+}
+
+func TestExportMethodTable_NotFunc(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+	export := &fooExport{}
+	tbl := make(map[string]interface{})
+	tbl["Foo"] = func(message Message, param string) (string, *Error) {
+		return export.Foo(message, param)
+	}
+	tbl["Foo2"] = "foobar"
+
+	connection.ExportMethodTable(tbl, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Foo: %s", err)
+	}
+
+	if response != "foo" {
+		t.Errorf(`Response was %s, expected "foo"`, response)
+	}
+
+	if export.message.serial == 0 {
+		t.Error("Expected the raw message, got an invalid one")
+	}
+
+	err = object.Call("org.guelfey.DBus.Test.Foo2", 0, "qux").Store(&response)
+	if err == nil {
+		t.Errorf("Expected an error since the Foo2 was not a function")
+	}
+}
+
+func TestExportMethodTable_ReturnNotError(t *testing.T) {
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+	export := &fooExport{}
+	tbl := make(map[string]interface{})
+	tbl["Foo"] = func(message Message, param string) (string, string) {
+		out, _ := export.Foo(message, param)
+		return out, out
+	}
+
+	connection.ExportMethodTable(tbl, "/org/guelfey/DBus/Test", "org.guelfey.DBus.Test")
+	object := connection.Object(name, "/org/guelfey/DBus/Test")
+
+	var response string
+	err = object.Call("org.guelfey.DBus.Test.Foo", 0, "qux").Store(&response)
+	if err == nil {
+		t.Errorf("Expected an error since the Foo did not have a final return as *dbus.Error")
+	}
+}
+
+// Test that introspection works on sub path of every exported object
+func TestExportSubPathIntrospection(t *testing.T) {
+	const (
+		introIntf    = "org.freedesktop.DBus.Introspectable"
+		respTmpl     = `^<node>\s*<node\s+name="%s"\s*/>\s*</node>$`
+		pathstr      = "/org/guelfey/DBus/Test"
+		foopathstr   = pathstr + "/Foo"
+		barpathstr   = pathstr + "/Bar"
+		test1intfstr = "org.guelfey.DBus.Test1"
+		test2intfstr = "org.guelfey.DBus.Test2"
+		intro        = `
+			<node>
+			<interface name="` + test1intfstr + `">
+				<method name="Foo">
+					<arg direction="out" type="s"/>
+				</method>
+			</interface>
+			<interface name="` + test2intfstr + `">
+				<method name="Foo">
+					<arg direction="out" type="s"/>
+				</method>
+				<method name="Bar">
+					<arg direction="out" type="s"/>
+				</method>
+			</interface>
+			<interface name="` + introIntf + `">
+				<method name="Introspect">
+					<arg name="out" direction="out" type="s"/>
+				</method>
+			</interface>
+			</node>`
+	)
+	connection, err := SessionBus()
+	if err != nil {
+		t.Fatalf("Unexpected error connecting to session bus: %s", err)
+	}
+
+	name := connection.Names()[0]
+
+	foo := &fooExport{}
+	bar := &barExport{}
+	connection.Export(foo, foopathstr, test1intfstr)
+	connection.Export(foo, foopathstr, test2intfstr)
+	connection.Export(bar, barpathstr, test2intfstr)
+	connection.Export(intro, pathstr, introIntf)
+
+	var response string
+	var match bool
+	path := strings.Split(pathstr, "/")
+	for i := 0; i < len(path)-1; i++ {
+		var subpath string
+		if i == 0 {
+			subpath = "/"
+		} else {
+			subpath = strings.Join(path[:i+1], "/")
+		}
+
+		object := connection.Object(name, ObjectPath(subpath))
+		err = object.Call(introIntf+".Introspect", 0).Store(&response)
+		if err != nil {
+			t.Errorf("Unexpected error calling Introspect on %s: %s", subpath, err)
+		}
+
+		exp := fmt.Sprintf(respTmpl, path[i+1])
+		match, err = regexp.MatchString(exp, response)
+		if err != nil {
+			t.Fatalf("Error calling MatchString: %s", err)
+		}
+		if !match {
+			t.Errorf("Unexpected introspection response for %s: %s", subpath, response)
+		}
+	}
+
+	// Test invalid subpath
+	invalSubpath := "/org/guelfey/DBus/Test/Nonexistent"
+	object := connection.Object(name, ObjectPath(invalSubpath))
+	err = object.Call(introIntf+".Introspect", 0).Store(&response)
+	if err != nil {
+		t.Errorf("Unexpected error calling Introspect on %s: %s", invalSubpath, err)
+	}
+	match, err = regexp.MatchString(`^<node>\s*</node>$`, response)
+	if err != nil {
+		t.Fatalf("Error calling MatchString: %s", err)
+	}
+	if !match {
+		t.Errorf("Unexpected introspection response for %s: %s", invalSubpath, response)
+	}
+}

vendor/github.com/godbus/dbus/homedir.go

@@ -0,0 +1,28 @@
+package dbus
+
+import (
+	"os"
+	"sync"
+)
+
+var (
+	homeDir     string
+	homeDirLock sync.Mutex
+)
+
+func getHomeDir() string {
+	homeDirLock.Lock()
+	defer homeDirLock.Unlock()
+
+	if homeDir != "" {
+		return homeDir
+	}
+
+	homeDir = os.Getenv("HOME")
+	if homeDir != "" {
+		return homeDir
+	}
+
+	homeDir = lookupHomeDir()
+	return homeDir
+}

vendor/github.com/godbus/dbus/homedir_dynamic.go

@@ -0,0 +1,15 @@
+// +build !static_build
+
+package dbus
+
+import (
+	"os/user"
+)
+
+func lookupHomeDir() string {
+	u, err := user.Current()
+	if err != nil {
+		return "/"
+	}
+	return u.HomeDir
+}

vendor/github.com/godbus/dbus/homedir_static.go

@@ -0,0 +1,45 @@
+// +build static_build
+
+package dbus
+
+import (
+	"bufio"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func lookupHomeDir() string {
+	myUid := os.Getuid()
+
+	f, err := os.Open("/etc/passwd")
+	if err != nil {
+		return "/"
+	}
+	defer f.Close()
+
+	s := bufio.NewScanner(f)
+
+	for s.Scan() {
+		if err := s.Err(); err != nil {
+			break
+		}
+
+		line := strings.TrimSpace(s.Text())
+		if line == "" {
+			continue
+		}
+
+		parts := strings.Split(line, ":")
+
+		if len(parts) >= 6 {
+			uid, err := strconv.Atoi(parts[2])
+			if err == nil && uid == myUid {
+				return parts[5]
+			}
+		}
+	}
+
+	// Default to / if we can't get a better value
+	return "/"
+}

vendor/github.com/godbus/dbus/introspect/call.go

@@ -0,0 +1,27 @@
+package introspect
+
+import (
+	"encoding/xml"
+	"github.com/godbus/dbus"
+	"strings"
+)
+
+// Call calls org.freedesktop.Introspectable.Introspect on a remote object
+// and returns the introspection data.
+func Call(o dbus.BusObject) (*Node, error) {
+	var xmldata string
+	var node Node
+
+	err := o.Call("org.freedesktop.DBus.Introspectable.Introspect", 0).Store(&xmldata)
+	if err != nil {
+		return nil, err
+	}
+	err = xml.NewDecoder(strings.NewReader(xmldata)).Decode(&node)
+	if err != nil {
+		return nil, err
+	}
+	if node.Name == "" {
+		node.Name = string(o.Path())
+	}
+	return &node, nil
+}

vendor/github.com/godbus/dbus/introspect/introspect.go

@@ -0,0 +1,86 @@
+// Package introspect provides some utilities for dealing with the DBus
+// introspection format.
+package introspect
+
+import "encoding/xml"
+
+// The introspection data for the org.freedesktop.DBus.Introspectable interface.
+var IntrospectData = Interface{
+	Name: "org.freedesktop.DBus.Introspectable",
+	Methods: []Method{
+		{
+			Name: "Introspect",
+			Args: []Arg{
+				{"out", "s", "out"},
+			},
+		},
+	},
+}
+
+// XML document type declaration of the introspection format version 1.0
+const IntrospectDeclarationString = `
+	<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
+	 "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+`
+
+// The introspection data for the org.freedesktop.DBus.Introspectable interface,
+// as a string.
+const IntrospectDataString = `
+	<interface name="org.freedesktop.DBus.Introspectable">
+		<method name="Introspect">
+			<arg name="out" direction="out" type="s"/>
+		</method>
+	</interface>
+`
+
+// Node is the root element of an introspection.
+type Node struct {
+	XMLName    xml.Name    `xml:"node"`
+	Name       string      `xml:"name,attr,omitempty"`
+	Interfaces []Interface `xml:"interface"`
+	Children   []Node      `xml:"node,omitempty"`
+}
+
+// Interface describes a DBus interface that is available on the message bus.
+type Interface struct {
+	Name        string       `xml:"name,attr"`
+	Methods     []Method     `xml:"method"`
+	Signals     []Signal     `xml:"signal"`
+	Properties  []Property   `xml:"property"`
+	Annotations []Annotation `xml:"annotation"`
+}
+
+// Method describes a Method on an Interface as retured by an introspection.
+type Method struct {
+	Name        string       `xml:"name,attr"`
+	Args        []Arg        `xml:"arg"`
+	Annotations []Annotation `xml:"annotation"`
+}
+
+// Signal describes a Signal emitted on an Interface.
+type Signal struct {
+	Name        string       `xml:"name,attr"`
+	Args        []Arg        `xml:"arg"`
+	Annotations []Annotation `xml:"annotation"`
+}
+
+// Property describes a property of an Interface.
+type Property struct {
+	Name        string       `xml:"name,attr"`
+	Type        string       `xml:"type,attr"`
+	Access      string       `xml:"access,attr"`
+	Annotations []Annotation `xml:"annotation"`
+}
+
+// Arg represents an argument of a method or a signal.
+type Arg struct {
+	Name      string `xml:"name,attr,omitempty"`
+	Type      string `xml:"type,attr"`
+	Direction string `xml:"direction,attr,omitempty"`
+}
+
+// Annotation is an annotation in the introspection format.
+type Annotation struct {
+	Name  string `xml:"name,attr"`
+	Value string `xml:"value,attr"`
+}

vendor/github.com/godbus/dbus/introspect/introspectable.go

@@ -0,0 +1,76 @@
+package introspect
+
+import (
+	"encoding/xml"
+	"github.com/godbus/dbus"
+	"reflect"
+	"strings"
+)
+
+// Introspectable implements org.freedesktop.Introspectable.
+//
+// You can create it by converting the XML-formatted introspection data from a
+// string to an Introspectable or call NewIntrospectable with a Node. Then,
+// export it as org.freedesktop.Introspectable on you object.
+type Introspectable string
+
+// NewIntrospectable returns an Introspectable that returns the introspection
+// data that corresponds to the given Node. If n.Interfaces doesn't contain the
+// data for org.freedesktop.DBus.Introspectable, it is added automatically.
+func NewIntrospectable(n *Node) Introspectable {
+	found := false
+	for _, v := range n.Interfaces {
+		if v.Name == "org.freedesktop.DBus.Introspectable" {
+			found = true
+			break
+		}
+	}
+	if !found {
+		n.Interfaces = append(n.Interfaces, IntrospectData)
+	}
+	b, err := xml.Marshal(n)
+	if err != nil {
+		panic(err)
+	}
+	return Introspectable(strings.TrimSpace(IntrospectDeclarationString) + string(b))
+}
+
+// Introspect implements org.freedesktop.Introspectable.Introspect.
+func (i Introspectable) Introspect() (string, *dbus.Error) {
+	return string(i), nil
+}
+
+// Methods returns the description of the methods of v. This can be used to
+// create a Node which can be passed to NewIntrospectable.
+func Methods(v interface{}) []Method {
+	t := reflect.TypeOf(v)
+	ms := make([]Method, 0, t.NumMethod())
+	for i := 0; i < t.NumMethod(); i++ {
+		if t.Method(i).PkgPath != "" {
+			continue
+		}
+		mt := t.Method(i).Type
+		if mt.NumOut() == 0 ||
+			mt.Out(mt.NumOut()-1) != reflect.TypeOf(&dbus.Error{}) {
+
+			continue
+		}
+		var m Method
+		m.Name = t.Method(i).Name
+		m.Args = make([]Arg, 0, mt.NumIn()+mt.NumOut()-2)
+		for j := 1; j < mt.NumIn(); j++ {
+			if mt.In(j) != reflect.TypeOf((*dbus.Sender)(nil)).Elem() &&
+				mt.In(j) != reflect.TypeOf((*dbus.Message)(nil)).Elem() {
+				arg := Arg{"", dbus.SignatureOfType(mt.In(j)).String(), "in"}
+				m.Args = append(m.Args, arg)
+			}
+		}
+		for j := 0; j < mt.NumOut()-1; j++ {
+			arg := Arg{"", dbus.SignatureOfType(mt.Out(j)).String(), "out"}
+			m.Args = append(m.Args, arg)
+		}
+		m.Annotations = make([]Annotation, 0)
+		ms = append(ms, m)
+	}
+	return ms
+}

vendor/github.com/godbus/dbus/message.go

@@ -0,0 +1,353 @@
+package dbus
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"reflect"
+	"strconv"
+)
+
+const protoVersion byte = 1
+
+// Flags represents the possible flags of a D-Bus message.
+type Flags byte
+
+const (
+	// FlagNoReplyExpected signals that the message is not expected to generate
+	// a reply. If this flag is set on outgoing messages, any possible reply
+	// will be discarded.
+	FlagNoReplyExpected Flags = 1 << iota
+	// FlagNoAutoStart signals that the message bus should not automatically
+	// start an application when handling this message.
+	FlagNoAutoStart
+	// FlagAllowInteractiveAuthorization may be set on a method call
+	// message to inform the receiving side that the caller is prepared
+	// to wait for interactive authorization, which might take a
+	// considerable time to complete. For instance, if this flag is set,
+	// it would be appropriate to query the user for passwords or
+	// confirmation via Polkit or a similar framework.
+	FlagAllowInteractiveAuthorization
+)
+
+// Type represents the possible types of a D-Bus message.
+type Type byte
+
+const (
+	TypeMethodCall Type = 1 + iota
+	TypeMethodReply
+	TypeError
+	TypeSignal
+	typeMax
+)
+
+func (t Type) String() string {
+	switch t {
+	case TypeMethodCall:
+		return "method call"
+	case TypeMethodReply:
+		return "reply"
+	case TypeError:
+		return "error"
+	case TypeSignal:
+		return "signal"
+	}
+	return "invalid"
+}
+
+// HeaderField represents the possible byte codes for the headers
+// of a D-Bus message.
+type HeaderField byte
+
+const (
+	FieldPath HeaderField = 1 + iota
+	FieldInterface
+	FieldMember
+	FieldErrorName
+	FieldReplySerial
+	FieldDestination
+	FieldSender
+	FieldSignature
+	FieldUnixFDs
+	fieldMax
+)
+
+// An InvalidMessageError describes the reason why a D-Bus message is regarded as
+// invalid.
+type InvalidMessageError string
+
+func (e InvalidMessageError) Error() string {
+	return "dbus: invalid message: " + string(e)
+}
+
+// fieldType are the types of the various header fields.
+var fieldTypes = [fieldMax]reflect.Type{
+	FieldPath:        objectPathType,
+	FieldInterface:   stringType,
+	FieldMember:      stringType,
+	FieldErrorName:   stringType,
+	FieldReplySerial: uint32Type,
+	FieldDestination: stringType,
+	FieldSender:      stringType,
+	FieldSignature:   signatureType,
+	FieldUnixFDs:     uint32Type,
+}
+
+// requiredFields lists the header fields that are required by the different
+// message types.
+var requiredFields = [typeMax][]HeaderField{
+	TypeMethodCall:  {FieldPath, FieldMember},
+	TypeMethodReply: {FieldReplySerial},
+	TypeError:       {FieldErrorName, FieldReplySerial},
+	TypeSignal:      {FieldPath, FieldInterface, FieldMember},
+}
+
+// Message represents a single D-Bus message.
+type Message struct {
+	Type
+	Flags
+	Headers map[HeaderField]Variant
+	Body    []interface{}
+
+	serial uint32
+}
+
+type header struct {
+	Field byte
+	Variant
+}
+
+// DecodeMessage tries to decode a single message in the D-Bus wire format
+// from the given reader. The byte order is figured out from the first byte.
+// The possibly returned error can be an error of the underlying reader, an
+// InvalidMessageError or a FormatError.
+func DecodeMessage(rd io.Reader) (msg *Message, err error) {
+	var order binary.ByteOrder
+	var hlength, length uint32
+	var typ, flags, proto byte
+	var headers []header
+
+	b := make([]byte, 1)
+	_, err = rd.Read(b)
+	if err != nil {
+		return
+	}
+	switch b[0] {
+	case 'l':
+		order = binary.LittleEndian
+	case 'B':
+		order = binary.BigEndian
+	default:
+		return nil, InvalidMessageError("invalid byte order")
+	}
+
+	dec := newDecoder(rd, order)
+	dec.pos = 1
+
+	msg = new(Message)
+	vs, err := dec.Decode(Signature{"yyyuu"})
+	if err != nil {
+		return nil, err
+	}
+	if err = Store(vs, &typ, &flags, &proto, &length, &msg.serial); err != nil {
+		return nil, err
+	}
+	msg.Type = Type(typ)
+	msg.Flags = Flags(flags)
+
+	// get the header length separately because we need it later
+	b = make([]byte, 4)
+	_, err = io.ReadFull(rd, b)
+	if err != nil {
+		return nil, err
+	}
+	binary.Read(bytes.NewBuffer(b), order, &hlength)
+	if hlength+length+16 > 1<<27 {
+		return nil, InvalidMessageError("message is too long")
+	}
+	dec = newDecoder(io.MultiReader(bytes.NewBuffer(b), rd), order)
+	dec.pos = 12
+	vs, err = dec.Decode(Signature{"a(yv)"})
+	if err != nil {
+		return nil, err
+	}
+	if err = Store(vs, &headers); err != nil {
+		return nil, err
+	}
+
+	msg.Headers = make(map[HeaderField]Variant)
+	for _, v := range headers {
+		msg.Headers[HeaderField(v.Field)] = v.Variant
+	}
+
+	dec.align(8)
+	body := make([]byte, int(length))
+	if length != 0 {
+		_, err := io.ReadFull(rd, body)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if err = msg.IsValid(); err != nil {
+		return nil, err
+	}
+	sig, _ := msg.Headers[FieldSignature].value.(Signature)
+	if sig.str != "" {
+		buf := bytes.NewBuffer(body)
+		dec = newDecoder(buf, order)
+		vs, err := dec.Decode(sig)
+		if err != nil {
+			return nil, err
+		}
+		msg.Body = vs
+	}
+
+	return
+}
+
+// EncodeTo encodes and sends a message to the given writer. The byte order must
+// be either binary.LittleEndian or binary.BigEndian. If the message is not
+// valid or an error occurs when writing, an error is returned.
+func (msg *Message) EncodeTo(out io.Writer, order binary.ByteOrder) error {
+	if err := msg.IsValid(); err != nil {
+		return err
+	}
+	var vs [7]interface{}
+	switch order {
+	case binary.LittleEndian:
+		vs[0] = byte('l')
+	case binary.BigEndian:
+		vs[0] = byte('B')
+	default:
+		return errors.New("dbus: invalid byte order")
+	}
+	body := new(bytes.Buffer)
+	enc := newEncoder(body, order)
+	if len(msg.Body) != 0 {
+		enc.Encode(msg.Body...)
+	}
+	vs[1] = msg.Type
+	vs[2] = msg.Flags
+	vs[3] = protoVersion
+	vs[4] = uint32(len(body.Bytes()))
+	vs[5] = msg.serial
+	headers := make([]header, 0, len(msg.Headers))
+	for k, v := range msg.Headers {
+		headers = append(headers, header{byte(k), v})
+	}
+	vs[6] = headers
+	var buf bytes.Buffer
+	enc = newEncoder(&buf, order)
+	enc.Encode(vs[:]...)
+	enc.align(8)
+	body.WriteTo(&buf)
+	if buf.Len() > 1<<27 {
+		return InvalidMessageError("message is too long")
+	}
+	if _, err := buf.WriteTo(out); err != nil {
+		return err
+	}
+	return nil
+}
+
+// IsValid checks whether msg is a valid message and returns an
+// InvalidMessageError if it is not.
+func (msg *Message) IsValid() error {
+	if msg.Flags & ^(FlagNoAutoStart|FlagNoReplyExpected|FlagAllowInteractiveAuthorization) != 0 {
+		return InvalidMessageError("invalid flags")
+	}
+	if msg.Type == 0 || msg.Type >= typeMax {
+		return InvalidMessageError("invalid message type")
+	}
+	for k, v := range msg.Headers {
+		if k == 0 || k >= fieldMax {
+			return InvalidMessageError("invalid header")
+		}
+		if reflect.TypeOf(v.value) != fieldTypes[k] {
+			return InvalidMessageError("invalid type of header field")
+		}
+	}
+	for _, v := range requiredFields[msg.Type] {
+		if _, ok := msg.Headers[v]; !ok {
+			return InvalidMessageError("missing required header")
+		}
+	}
+	if path, ok := msg.Headers[FieldPath]; ok {
+		if !path.value.(ObjectPath).IsValid() {
+			return InvalidMessageError("invalid path name")
+		}
+	}
+	if iface, ok := msg.Headers[FieldInterface]; ok {
+		if !isValidInterface(iface.value.(string)) {
+			return InvalidMessageError("invalid interface name")
+		}
+	}
+	if member, ok := msg.Headers[FieldMember]; ok {
+		if !isValidMember(member.value.(string)) {
+			return InvalidMessageError("invalid member name")
+		}
+	}
+	if errname, ok := msg.Headers[FieldErrorName]; ok {
+		if !isValidInterface(errname.value.(string)) {
+			return InvalidMessageError("invalid error name")
+		}
+	}
+	if len(msg.Body) != 0 {
+		if _, ok := msg.Headers[FieldSignature]; !ok {
+			return InvalidMessageError("missing signature")
+		}
+	}
+	return nil
+}
+
+// Serial returns the message's serial number. The returned value is only valid
+// for messages received by eavesdropping.
+func (msg *Message) Serial() uint32 {
+	return msg.serial
+}
+
+// String returns a string representation of a message similar to the format of
+// dbus-monitor.
+func (msg *Message) String() string {
+	if err := msg.IsValid(); err != nil {
+		return "<invalid>"
+	}
+	s := msg.Type.String()
+	if v, ok := msg.Headers[FieldSender]; ok {
+		s += " from " + v.value.(string)
+	}
+	if v, ok := msg.Headers[FieldDestination]; ok {
+		s += " to " + v.value.(string)
+	}
+	s += " serial " + strconv.FormatUint(uint64(msg.serial), 10)
+	if v, ok := msg.Headers[FieldReplySerial]; ok {
+		s += " reply_serial " + strconv.FormatUint(uint64(v.value.(uint32)), 10)
+	}
+	if v, ok := msg.Headers[FieldUnixFDs]; ok {
+		s += " unixfds " + strconv.FormatUint(uint64(v.value.(uint32)), 10)
+	}
+	if v, ok := msg.Headers[FieldPath]; ok {
+		s += " path " + string(v.value.(ObjectPath))
+	}
+	if v, ok := msg.Headers[FieldInterface]; ok {
+		s += " interface " + v.value.(string)
+	}
+	if v, ok := msg.Headers[FieldErrorName]; ok {
+		s += " error " + v.value.(string)
+	}
+	if v, ok := msg.Headers[FieldMember]; ok {
+		s += " member " + v.value.(string)
+	}
+	if len(msg.Body) != 0 {
+		s += "\n"
+	}
+	for i, v := range msg.Body {
+		s += "  " + MakeVariant(v).String()
+		if i != len(msg.Body)-1 {
+			s += "\n"
+		}
+	}
+	return s
+}

vendor/github.com/godbus/dbus/object.go

@@ -0,0 +1,147 @@
+package dbus
+
+import (
+	"errors"
+	"strings"
+)
+
+// BusObject is the interface of a remote object on which methods can be
+// invoked.
+type BusObject interface {
+	Call(method string, flags Flags, args ...interface{}) *Call
+	Go(method string, flags Flags, ch chan *Call, args ...interface{}) *Call
+	GetProperty(p string) (Variant, error)
+	Destination() string
+	Path() ObjectPath
+}
+
+// Object represents a remote object on which methods can be invoked.
+type Object struct {
+	conn *Conn
+	dest string
+	path ObjectPath
+}
+
+// Call calls a method with (*Object).Go and waits for its reply.
+func (o *Object) Call(method string, flags Flags, args ...interface{}) *Call {
+	return <-o.Go(method, flags, make(chan *Call, 1), args...).Done
+}
+
+// AddMatchSignal subscribes BusObject to signals from specified interface and
+// method (member).
+func (o *Object) AddMatchSignal(iface, member string) *Call {
+	return o.Call(
+		"org.freedesktop.DBus.AddMatch",
+		0,
+		"type='signal',interface='"+iface+"',member='"+member+"'",
+	)
+}
+
+// Go calls a method with the given arguments asynchronously. It returns a
+// Call structure representing this method call. The passed channel will
+// return the same value once the call is done. If ch is nil, a new channel
+// will be allocated. Otherwise, ch has to be buffered or Go will panic.
+//
+// If the flags include FlagNoReplyExpected, ch is ignored and a Call structure
+// is returned with any error in Err and a closed channel in Done containing
+// the returned Call as it's one entry.
+//
+// If the method parameter contains a dot ('.'), the part before the last dot
+// specifies the interface on which the method is called.
+func (o *Object) Go(method string, flags Flags, ch chan *Call, args ...interface{}) *Call {
+	iface := ""
+	i := strings.LastIndex(method, ".")
+	if i != -1 {
+		iface = method[:i]
+	}
+	method = method[i+1:]
+	msg := new(Message)
+	msg.Type = TypeMethodCall
+	msg.serial = o.conn.getSerial()
+	msg.Flags = flags & (FlagNoAutoStart | FlagNoReplyExpected)
+	msg.Headers = make(map[HeaderField]Variant)
+	msg.Headers[FieldPath] = MakeVariant(o.path)
+	msg.Headers[FieldDestination] = MakeVariant(o.dest)
+	msg.Headers[FieldMember] = MakeVariant(method)
+	if iface != "" {
+		msg.Headers[FieldInterface] = MakeVariant(iface)
+	}
+	msg.Body = args
+	if len(args) > 0 {
+		msg.Headers[FieldSignature] = MakeVariant(SignatureOf(args...))
+	}
+	if msg.Flags&FlagNoReplyExpected == 0 {
+		if ch == nil {
+			ch = make(chan *Call, 10)
+		} else if cap(ch) == 0 {
+			panic("dbus: unbuffered channel passed to (*Object).Go")
+		}
+		call := &Call{
+			Destination: o.dest,
+			Path:        o.path,
+			Method:      method,
+			Args:        args,
+			Done:        ch,
+		}
+		o.conn.callsLck.Lock()
+		o.conn.calls[msg.serial] = call
+		o.conn.callsLck.Unlock()
+		o.conn.outLck.RLock()
+		if o.conn.closed {
+			call.Err = ErrClosed
+			call.Done <- call
+		} else {
+			o.conn.out <- msg
+		}
+		o.conn.outLck.RUnlock()
+		return call
+	}
+	o.conn.outLck.RLock()
+	defer o.conn.outLck.RUnlock()
+	done := make(chan *Call, 1)
+	call := &Call{
+		Err:  nil,
+		Done: done,
+	}
+	defer func() {
+		call.Done <- call
+		close(done)
+	}()
+	if o.conn.closed {
+		call.Err = ErrClosed
+		return call
+	}
+	o.conn.out <- msg
+	return call
+}
+
+// GetProperty calls org.freedesktop.DBus.Properties.GetProperty on the given
+// object. The property name must be given in interface.member notation.
+func (o *Object) GetProperty(p string) (Variant, error) {
+	idx := strings.LastIndex(p, ".")
+	if idx == -1 || idx+1 == len(p) {
+		return Variant{}, errors.New("dbus: invalid property " + p)
+	}
+
+	iface := p[:idx]
+	prop := p[idx+1:]
+
+	result := Variant{}
+	err := o.Call("org.freedesktop.DBus.Properties.Get", 0, iface, prop).Store(&result)
+
+	if err != nil {
+		return Variant{}, err
+	}
+
+	return result, nil
+}
+
+// Destination returns the destination that calls on (o *Object) are sent to.
+func (o *Object) Destination() string {
+	return o.dest
+}
+
+// Path returns the path that calls on (o *Object") are sent to.
+func (o *Object) Path() ObjectPath {
+	return o.path
+}

vendor/github.com/godbus/dbus/prop/prop.go

@@ -0,0 +1,264 @@
+// Package prop provides the Properties struct which can be used to implement
+// org.freedesktop.DBus.Properties.
+package prop
+
+import (
+	"github.com/godbus/dbus"
+	"github.com/godbus/dbus/introspect"
+	"sync"
+)
+
+// EmitType controls how org.freedesktop.DBus.Properties.PropertiesChanged is
+// emitted for a property. If it is EmitTrue, the signal is emitted. If it is
+// EmitInvalidates, the signal is also emitted, but the new value of the property
+// is not disclosed.
+type EmitType byte
+
+const (
+	EmitFalse EmitType = iota
+	EmitTrue
+	EmitInvalidates
+)
+
+// ErrIfaceNotFound is the error returned to peers who try to access properties
+// on interfaces that aren't found.
+var ErrIfaceNotFound = dbus.NewError("org.freedesktop.DBus.Properties.Error.InterfaceNotFound", nil)
+
+// ErrPropNotFound is the error returned to peers trying to access properties
+// that aren't found.
+var ErrPropNotFound = dbus.NewError("org.freedesktop.DBus.Properties.Error.PropertyNotFound", nil)
+
+// ErrReadOnly is the error returned to peers trying to set a read-only
+// property.
+var ErrReadOnly = dbus.NewError("org.freedesktop.DBus.Properties.Error.ReadOnly", nil)
+
+// ErrInvalidArg is returned to peers if the type of the property that is being
+// changed and the argument don't match.
+var ErrInvalidArg = dbus.NewError("org.freedesktop.DBus.Properties.Error.InvalidArg", nil)
+
+// The introspection data for the org.freedesktop.DBus.Properties interface.
+var IntrospectData = introspect.Interface{
+	Name: "org.freedesktop.DBus.Properties",
+	Methods: []introspect.Method{
+		{
+			Name: "Get",
+			Args: []introspect.Arg{
+				{"interface", "s", "in"},
+				{"property", "s", "in"},
+				{"value", "v", "out"},
+			},
+		},
+		{
+			Name: "GetAll",
+			Args: []introspect.Arg{
+				{"interface", "s", "in"},
+				{"props", "a{sv}", "out"},
+			},
+		},
+		{
+			Name: "Set",
+			Args: []introspect.Arg{
+				{"interface", "s", "in"},
+				{"property", "s", "in"},
+				{"value", "v", "in"},
+			},
+		},
+	},
+	Signals: []introspect.Signal{
+		{
+			Name: "PropertiesChanged",
+			Args: []introspect.Arg{
+				{"interface", "s", "out"},
+				{"changed_properties", "a{sv}", "out"},
+				{"invalidates_properties", "as", "out"},
+			},
+		},
+	},
+}
+
+// The introspection data for the org.freedesktop.DBus.Properties interface, as
+// a string.
+const IntrospectDataString = `
+	<interface name="org.freedesktop.DBus.Properties">
+		<method name="Get">
+			<arg name="interface" direction="in" type="s"/>
+			<arg name="property" direction="in" type="s"/>
+			<arg name="value" direction="out" type="v"/>
+		</method>
+		<method name="GetAll">
+			<arg name="interface" direction="in" type="s"/>
+			<arg name="props" direction="out" type="a{sv}"/>
+		</method>
+		<method name="Set">
+			<arg name="interface" direction="in" type="s"/>
+			<arg name="property" direction="in" type="s"/>
+			<arg name="value" direction="in" type="v"/>
+		</method>
+		<signal name="PropertiesChanged">
+			<arg name="interface" type="s"/>
+			<arg name="changed_properties" type="a{sv}"/>
+			<arg name="invalidates_properties" type="as"/>
+		</signal>
+	</interface>
+`
+
+// Prop represents a single property. It is used for creating a Properties
+// value.
+type Prop struct {
+	// Initial value. Must be a DBus-representable type.
+	Value interface{}
+
+	// If true, the value can be modified by calls to Set.
+	Writable bool
+
+	// Controls how org.freedesktop.DBus.Properties.PropertiesChanged is
+	// emitted if this property changes.
+	Emit EmitType
+
+	// If not nil, anytime this property is changed by Set, this function is
+	// called with an appropiate Change as its argument. If the returned error
+	// is not nil, it is sent back to the caller of Set and the property is not
+	// changed.
+	Callback func(*Change) *dbus.Error
+}
+
+// Change represents a change of a property by a call to Set.
+type Change struct {
+	Props *Properties
+	Iface string
+	Name  string
+	Value interface{}
+}
+
+// Properties is a set of values that can be made available to the message bus
+// using the org.freedesktop.DBus.Properties interface. It is safe for
+// concurrent use by multiple goroutines.
+type Properties struct {
+	m    map[string]map[string]*Prop
+	mut  sync.RWMutex
+	conn *dbus.Conn
+	path dbus.ObjectPath
+}
+
+// New returns a new Properties structure that manages the given properties.
+// The key for the first-level map of props is the name of the interface; the
+// second-level key is the name of the property. The returned structure will be
+// exported as org.freedesktop.DBus.Properties on path.
+func New(conn *dbus.Conn, path dbus.ObjectPath, props map[string]map[string]*Prop) *Properties {
+	p := &Properties{m: props, conn: conn, path: path}
+	conn.Export(p, path, "org.freedesktop.DBus.Properties")
+	return p
+}
+
+// Get implements org.freedesktop.DBus.Properties.Get.
+func (p *Properties) Get(iface, property string) (dbus.Variant, *dbus.Error) {
+	p.mut.RLock()
+	defer p.mut.RUnlock()
+	m, ok := p.m[iface]
+	if !ok {
+		return dbus.Variant{}, ErrIfaceNotFound
+	}
+	prop, ok := m[property]
+	if !ok {
+		return dbus.Variant{}, ErrPropNotFound
+	}
+	return dbus.MakeVariant(prop.Value), nil
+}
+
+// GetAll implements org.freedesktop.DBus.Properties.GetAll.
+func (p *Properties) GetAll(iface string) (map[string]dbus.Variant, *dbus.Error) {
+	p.mut.RLock()
+	defer p.mut.RUnlock()
+	m, ok := p.m[iface]
+	if !ok {
+		return nil, ErrIfaceNotFound
+	}
+	rm := make(map[string]dbus.Variant, len(m))
+	for k, v := range m {
+		rm[k] = dbus.MakeVariant(v.Value)
+	}
+	return rm, nil
+}
+
+// GetMust returns the value of the given property and panics if either the
+// interface or the property name are invalid.
+func (p *Properties) GetMust(iface, property string) interface{} {
+	p.mut.RLock()
+	defer p.mut.RUnlock()
+	return p.m[iface][property].Value
+}
+
+// Introspection returns the introspection data that represents the properties
+// of iface.
+func (p *Properties) Introspection(iface string) []introspect.Property {
+	p.mut.RLock()
+	defer p.mut.RUnlock()
+	m := p.m[iface]
+	s := make([]introspect.Property, 0, len(m))
+	for k, v := range m {
+		p := introspect.Property{Name: k, Type: dbus.SignatureOf(v.Value).String()}
+		if v.Writable {
+			p.Access = "readwrite"
+		} else {
+			p.Access = "read"
+		}
+		s = append(s, p)
+	}
+	return s
+}
+
+// set sets the given property and emits PropertyChanged if appropiate. p.mut
+// must already be locked.
+func (p *Properties) set(iface, property string, v interface{}) {
+	prop := p.m[iface][property]
+	prop.Value = v
+	switch prop.Emit {
+	case EmitFalse:
+		// do nothing
+	case EmitInvalidates:
+		p.conn.Emit(p.path, "org.freedesktop.DBus.Properties.PropertiesChanged",
+			iface, map[string]dbus.Variant{}, []string{property})
+	case EmitTrue:
+		p.conn.Emit(p.path, "org.freedesktop.DBus.Properties.PropertiesChanged",
+			iface, map[string]dbus.Variant{property: dbus.MakeVariant(v)},
+			[]string{})
+	default:
+		panic("invalid value for EmitType")
+	}
+}
+
+// Set implements org.freedesktop.Properties.Set.
+func (p *Properties) Set(iface, property string, newv dbus.Variant) *dbus.Error {
+	p.mut.Lock()
+	defer p.mut.Unlock()
+	m, ok := p.m[iface]
+	if !ok {
+		return ErrIfaceNotFound
+	}
+	prop, ok := m[property]
+	if !ok {
+		return ErrPropNotFound
+	}
+	if !prop.Writable {
+		return ErrReadOnly
+	}
+	if newv.Signature() != dbus.SignatureOf(prop.Value) {
+		return ErrInvalidArg
+	}
+	if prop.Callback != nil {
+		err := prop.Callback(&Change{p, iface, property, newv.Value()})
+		if err != nil {
+			return err
+		}
+	}
+	p.set(iface, property, newv.Value())
+	return nil
+}
+
+// SetMust sets the value of the given property and panics if the interface or
+// the property name are invalid.
+func (p *Properties) SetMust(iface, property string, v interface{}) {
+	p.mut.Lock()
+	p.set(iface, property, v)
+	p.mut.Unlock()
+}

vendor/github.com/godbus/dbus/proto_test.go

@@ -0,0 +1,369 @@
+package dbus
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io/ioutil"
+	"math"
+	"reflect"
+	"testing"
+)
+
+var protoTests = []struct {
+	vs           []interface{}
+	bigEndian    []byte
+	littleEndian []byte
+}{
+	{
+		[]interface{}{int32(0)},
+		[]byte{0, 0, 0, 0},
+		[]byte{0, 0, 0, 0},
+	},
+	{
+		[]interface{}{true, false},
+		[]byte{0, 0, 0, 1, 0, 0, 0, 0},
+		[]byte{1, 0, 0, 0, 0, 0, 0, 0},
+	},
+	{
+		[]interface{}{byte(0), uint16(12), int16(32), uint32(43)},
+		[]byte{0, 0, 0, 12, 0, 32, 0, 0, 0, 0, 0, 43},
+		[]byte{0, 0, 12, 0, 32, 0, 0, 0, 43, 0, 0, 0},
+	},
+	{
+		[]interface{}{int64(-1), uint64(1<<64 - 1)},
+		bytes.Repeat([]byte{255}, 16),
+		bytes.Repeat([]byte{255}, 16),
+	},
+	{
+		[]interface{}{math.Inf(+1)},
+		[]byte{0x7f, 0xf0, 0, 0, 0, 0, 0, 0},
+		[]byte{0, 0, 0, 0, 0, 0, 0xf0, 0x7f},
+	},
+	{
+		[]interface{}{"foo"},
+		[]byte{0, 0, 0, 3, 'f', 'o', 'o', 0},
+		[]byte{3, 0, 0, 0, 'f', 'o', 'o', 0},
+	},
+	{
+		[]interface{}{Signature{"ai"}},
+		[]byte{2, 'a', 'i', 0},
+		[]byte{2, 'a', 'i', 0},
+	},
+	{
+		[]interface{}{[]int16{42, 256}},
+		[]byte{0, 0, 0, 4, 0, 42, 1, 0},
+		[]byte{4, 0, 0, 0, 42, 0, 0, 1},
+	},
+	{
+		[]interface{}{MakeVariant("foo")},
+		[]byte{1, 's', 0, 0, 0, 0, 0, 3, 'f', 'o', 'o', 0},
+		[]byte{1, 's', 0, 0, 3, 0, 0, 0, 'f', 'o', 'o', 0},
+	},
+	{
+		[]interface{}{MakeVariant(MakeVariant(Signature{"v"}))},
+		[]byte{1, 'v', 0, 1, 'g', 0, 1, 'v', 0},
+		[]byte{1, 'v', 0, 1, 'g', 0, 1, 'v', 0},
+	},
+	{
+		[]interface{}{map[int32]bool{42: true}},
+		[]byte{0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 42, 0, 0, 0, 1},
+		[]byte{8, 0, 0, 0, 0, 0, 0, 0, 42, 0, 0, 0, 1, 0, 0, 0},
+	},
+	{
+		[]interface{}{map[string]Variant{}, byte(42)},
+		[]byte{0, 0, 0, 0, 0, 0, 0, 0, 42},
+		[]byte{0, 0, 0, 0, 0, 0, 0, 0, 42},
+	},
+	{
+		[]interface{}{[]uint64{}, byte(42)},
+		[]byte{0, 0, 0, 0, 0, 0, 0, 0, 42},
+		[]byte{0, 0, 0, 0, 0, 0, 0, 0, 42},
+	},
+}
+
+func TestProto(t *testing.T) {
+	for i, v := range protoTests {
+		buf := new(bytes.Buffer)
+		bigEnc := newEncoder(buf, binary.BigEndian)
+		bigEnc.Encode(v.vs...)
+		marshalled := buf.Bytes()
+		if bytes.Compare(marshalled, v.bigEndian) != 0 {
+			t.Errorf("test %d (marshal be): got '%v', but expected '%v'\n", i+1, marshalled,
+				v.bigEndian)
+		}
+		buf.Reset()
+		litEnc := newEncoder(buf, binary.LittleEndian)
+		litEnc.Encode(v.vs...)
+		marshalled = buf.Bytes()
+		if bytes.Compare(marshalled, v.littleEndian) != 0 {
+			t.Errorf("test %d (marshal le): got '%v', but expected '%v'\n", i+1, marshalled,
+				v.littleEndian)
+		}
+		unmarshalled := reflect.MakeSlice(reflect.TypeOf(v.vs),
+			0, 0)
+		for i := range v.vs {
+			unmarshalled = reflect.Append(unmarshalled,
+				reflect.New(reflect.TypeOf(v.vs[i])))
+		}
+		bigDec := newDecoder(bytes.NewReader(v.bigEndian), binary.BigEndian)
+		vs, err := bigDec.Decode(SignatureOf(v.vs...))
+		if err != nil {
+			t.Errorf("test %d (unmarshal be): %s\n", i+1, err)
+			continue
+		}
+		if !reflect.DeepEqual(vs, v.vs) {
+			t.Errorf("test %d (unmarshal be): got %#v, but expected %#v\n", i+1, vs, v.vs)
+		}
+		litDec := newDecoder(bytes.NewReader(v.littleEndian), binary.LittleEndian)
+		vs, err = litDec.Decode(SignatureOf(v.vs...))
+		if err != nil {
+			t.Errorf("test %d (unmarshal le): %s\n", i+1, err)
+			continue
+		}
+		if !reflect.DeepEqual(vs, v.vs) {
+			t.Errorf("test %d (unmarshal le): got %#v, but expected %#v\n", i+1, vs, v.vs)
+		}
+
+	}
+}
+
+func TestProtoMap(t *testing.T) {
+	m := map[string]uint8{
+		"foo": 23,
+		"bar": 2,
+	}
+	var n map[string]uint8
+	buf := new(bytes.Buffer)
+	enc := newEncoder(buf, binary.LittleEndian)
+	enc.Encode(m)
+	dec := newDecoder(buf, binary.LittleEndian)
+	vs, err := dec.Decode(Signature{"a{sy}"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = Store(vs, &n); err != nil {
+		t.Fatal(err)
+	}
+	if len(n) != 2 || n["foo"] != 23 || n["bar"] != 2 {
+		t.Error("got", n)
+	}
+}
+
+func TestProtoVariantStruct(t *testing.T) {
+	var variant Variant
+	v := MakeVariant(struct {
+		A int32
+		B int16
+	}{1, 2})
+	buf := new(bytes.Buffer)
+	enc := newEncoder(buf, binary.LittleEndian)
+	enc.Encode(v)
+	dec := newDecoder(buf, binary.LittleEndian)
+	vs, err := dec.Decode(Signature{"v"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = Store(vs, &variant); err != nil {
+		t.Fatal(err)
+	}
+	sl := variant.Value().([]interface{})
+	v1, v2 := sl[0].(int32), sl[1].(int16)
+	if v1 != int32(1) {
+		t.Error("got", v1, "as first int")
+	}
+	if v2 != int16(2) {
+		t.Error("got", v2, "as second int")
+	}
+}
+
+func TestProtoStructTag(t *testing.T) {
+	type Bar struct {
+		A int32
+		B chan interface{} `dbus:"-"`
+		C int32
+	}
+	var bar1, bar2 Bar
+	bar1.A = 234
+	bar2.C = 345
+	buf := new(bytes.Buffer)
+	enc := newEncoder(buf, binary.LittleEndian)
+	enc.Encode(bar1)
+	dec := newDecoder(buf, binary.LittleEndian)
+	vs, err := dec.Decode(Signature{"(ii)"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = Store(vs, &bar2); err != nil {
+		t.Fatal(err)
+	}
+	if bar1 != bar2 {
+		t.Error("struct tag test: got", bar2)
+	}
+}
+
+func TestProtoStoreStruct(t *testing.T) {
+	var foo struct {
+		A int32
+		B string
+		c chan interface{}
+		D interface{} `dbus:"-"`
+	}
+	src := []interface{}{[]interface{}{int32(42), "foo"}}
+	err := Store(src, &foo)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestProtoStoreNestedStruct(t *testing.T) {
+	var foo struct {
+		A int32
+		B struct {
+			C string
+			D float64
+		}
+	}
+	src := []interface{}{
+		[]interface{}{
+			int32(42),
+			[]interface{}{
+				"foo",
+				3.14,
+			},
+		},
+	}
+	err := Store(src, &foo)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestMessage(t *testing.T) {
+	buf := new(bytes.Buffer)
+	message := new(Message)
+	message.Type = TypeMethodCall
+	message.serial = 32
+	message.Headers = map[HeaderField]Variant{
+		FieldPath:   MakeVariant(ObjectPath("/org/foo/bar")),
+		FieldMember: MakeVariant("baz"),
+	}
+	message.Body = make([]interface{}, 0)
+	err := message.EncodeTo(buf, binary.LittleEndian)
+	if err != nil {
+		t.Error(err)
+	}
+	_, err = DecodeMessage(buf)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestProtoStructInterfaces(t *testing.T) {
+	b := []byte{42}
+	vs, err := newDecoder(bytes.NewReader(b), binary.LittleEndian).Decode(Signature{"(y)"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if vs[0].([]interface{})[0].(byte) != 42 {
+		t.Errorf("wrongs results (got %v)", vs)
+	}
+}
+
+// ordinary org.freedesktop.DBus.Hello call
+var smallMessage = &Message{
+	Type:   TypeMethodCall,
+	serial: 1,
+	Headers: map[HeaderField]Variant{
+		FieldDestination: MakeVariant("org.freedesktop.DBus"),
+		FieldPath:        MakeVariant(ObjectPath("/org/freedesktop/DBus")),
+		FieldInterface:   MakeVariant("org.freedesktop.DBus"),
+		FieldMember:      MakeVariant("Hello"),
+	},
+}
+
+// org.freedesktop.Notifications.Notify
+var bigMessage = &Message{
+	Type:   TypeMethodCall,
+	serial: 2,
+	Headers: map[HeaderField]Variant{
+		FieldDestination: MakeVariant("org.freedesktop.Notifications"),
+		FieldPath:        MakeVariant(ObjectPath("/org/freedesktop/Notifications")),
+		FieldInterface:   MakeVariant("org.freedesktop.Notifications"),
+		FieldMember:      MakeVariant("Notify"),
+		FieldSignature:   MakeVariant(Signature{"susssasa{sv}i"}),
+	},
+	Body: []interface{}{
+		"app_name",
+		uint32(0),
+		"dialog-information",
+		"Notification",
+		"This is the body of a notification",
+		[]string{"ok", "Ok"},
+		map[string]Variant{
+			"sound-name": MakeVariant("dialog-information"),
+		},
+		int32(-1),
+	},
+}
+
+func BenchmarkDecodeMessageSmall(b *testing.B) {
+	var err error
+	var rd *bytes.Reader
+
+	b.StopTimer()
+	buf := new(bytes.Buffer)
+	err = smallMessage.EncodeTo(buf, binary.LittleEndian)
+	if err != nil {
+		b.Fatal(err)
+	}
+	decoded := buf.Bytes()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		rd = bytes.NewReader(decoded)
+		_, err = DecodeMessage(rd)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkDecodeMessageBig(b *testing.B) {
+	var err error
+	var rd *bytes.Reader
+
+	b.StopTimer()
+	buf := new(bytes.Buffer)
+	err = bigMessage.EncodeTo(buf, binary.LittleEndian)
+	if err != nil {
+		b.Fatal(err)
+	}
+	decoded := buf.Bytes()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		rd = bytes.NewReader(decoded)
+		_, err = DecodeMessage(rd)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkEncodeMessageSmall(b *testing.B) {
+	var err error
+	for i := 0; i < b.N; i++ {
+		err = smallMessage.EncodeTo(ioutil.Discard, binary.LittleEndian)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkEncodeMessageBig(b *testing.B) {
+	var err error
+	for i := 0; i < b.N; i++ {
+		err = bigMessage.EncodeTo(ioutil.Discard, binary.LittleEndian)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}

vendor/github.com/godbus/dbus/server_interfaces.go

@@ -0,0 +1,89 @@
+package dbus
+
+// Terminator allows a handler to implement a shutdown mechanism that
+// is called when the connection terminates.
+type Terminator interface {
+	Terminate()
+}
+
+// Handler is the representation of a D-Bus Application.
+//
+// The Handler must have a way to lookup objects given
+// an ObjectPath. The returned object must implement the
+// ServerObject interface.
+type Handler interface {
+	LookupObject(path ObjectPath) (ServerObject, bool)
+}
+
+// ServerObject is the representation of an D-Bus Object.
+//
+// Objects are registered at a path for a given Handler.
+// The Objects implement D-Bus interfaces. The semantics
+// of Interface lookup is up to the implementation of
+// the ServerObject. The ServerObject implementation may
+// choose to implement empty string as a valid interface
+// represeting all methods or not per the D-Bus specification.
+type ServerObject interface {
+	LookupInterface(name string) (Interface, bool)
+}
+
+// An Interface is the representation of a D-Bus Interface.
+//
+// Interfaces are a grouping of methods implemented by the Objects.
+// Interfaces are responsible for routing method calls.
+type Interface interface {
+	LookupMethod(name string) (Method, bool)
+}
+
+// A Method represents the exposed methods on D-Bus.
+type Method interface {
+	// Call requires that all arguments are decoded before being passed to it.
+	Call(args ...interface{}) ([]interface{}, error)
+	NumArguments() int
+	NumReturns() int
+	// ArgumentValue returns a representative value for the argument at position
+	// it should be of the proper type. reflect.Zero would be a good mechanism
+	// to use for this Value.
+	ArgumentValue(position int) interface{}
+	// ReturnValue returns a representative value for the return at position
+	// it should be of the proper type. reflect.Zero would be a good mechanism
+	// to use for this Value.
+	ReturnValue(position int) interface{}
+}
+
+// An Argument Decoder can decode arguments using the non-standard mechanism
+//
+// If a method implements this interface then the non-standard
+// decoder will be used.
+//
+// Method arguments must be decoded from the message.
+// The mechanism for doing this will vary based on the
+// implementation of the method. A normal approach is provided
+// as part of this library, but may be replaced with
+// any other decoding scheme.
+type ArgumentDecoder interface {
+	// To decode the arguments of a method the sender and message are
+	// provided incase the semantics of the implementer provides access
+	// to these as part of the method invocation.
+	DecodeArguments(conn *Conn, sender string, msg *Message, args []interface{}) ([]interface{}, error)
+}
+
+// A SignalHandler is responsible for delivering a signal.
+//
+// Signal delivery may be changed from the default channel
+// based approach by Handlers implementing the SignalHandler
+// interface.
+type SignalHandler interface {
+	DeliverSignal(iface, name string, signal *Signal)
+}
+
+// A DBusError is used to convert a generic object to a D-Bus error.
+//
+// Any custom error mechanism may implement this interface to provide
+// a custom encoding of the error on D-Bus. By default if a normal
+// error is returned, it will be encoded as the generic
+// "org.freedesktop.DBus.Error.Failed" error. By implementing this
+// interface as well a custom encoding may be provided.
+type DBusError interface {
+	DBusError() (string, []interface{})
+}

vendor/github.com/godbus/dbus/server_interfaces_test.go

@@ -0,0 +1,417 @@
+package dbus
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+type tester struct {
+	conn    *Conn
+	sigs    chan *Signal
+	subSigs map[string]map[string]struct{}
+}
+
+type intro struct {
+	path ObjectPath
+}
+
+func (i *intro) introspectPath(path ObjectPath) string {
+	switch path {
+	case "/":
+		return `<node><node name="com"></node></node>`
+	case "/com":
+		return `<node><node name="github"></node></node>`
+	case "/com/github":
+		return `<node><node name="godbus"></node></node>`
+	case "/com/github/godbus":
+		return `<node><node name="tester"></node></node>`
+	}
+	return ""
+}
+
+func (i *intro) LookupInterface(name string) (Interface, bool) {
+	if name == "org.freedesktop.DBus.Introspectable" {
+		return i, true
+	}
+	return nil, false
+}
+
+func (i *intro) LookupMethod(name string) (Method, bool) {
+	if name == "Introspect" {
+		return intro_fn(func() string {
+			return i.introspectPath(i.path)
+		}), true
+	}
+	return nil, false
+}
+
+func newIntro(path ObjectPath) *intro {
+	return &intro{path}
+}
+
+//Handler
+func (t *tester) LookupObject(path ObjectPath) (ServerObject, bool) {
+	if path == "/com/github/godbus/tester" {
+		return t, true
+	}
+	return newIntro(path), true
+}
+
+//ServerObject
+func (t *tester) LookupInterface(name string) (Interface, bool) {
+	switch name {
+	case "com.github.godbus.dbus.Tester":
+		return t, true
+	case "org.freedesktop.DBus.Introspectable":
+		return t, true
+	}
+
+	return nil, false
+}
+
+//Interface
+func (t *tester) LookupMethod(name string) (Method, bool) {
+	switch name {
+	case "Test":
+		return t, true
+	case "Error":
+		return terrfn(func(in string) error {
+			return fmt.Errorf(in)
+		}), true
+	case "Introspect":
+		return intro_fn(func() string {
+			return `<node>
+    <interface name="org.freedesktop.DBus.Introspectable.Introspect">
+        <method name="Introspect">
+            <arg name="out" type="i" direction="out">
+        </method>
+    </interface>
+    <interface name="com.github.godbus.dbus.Tester">
+        <method name="Test">
+            <arg name="in" type="i" direction="in">
+            <arg name="out" type="i" direction="out">
+        </method>
+        <signal name="sig1">
+            <arg name="out" type="i" direction="out">
+        </signal>
+    </interface>
+</node>`
+		}), true
+	}
+	return nil, false
+}
+
+//Method
+func (t *tester) Call(args ...interface{}) ([]interface{}, error) {
+	return args, nil
+}
+
+func (t *tester) NumArguments() int {
+	return 1
+}
+
+func (t *tester) NumReturns() int {
+	return 1
+}
+
+func (t *tester) ArgumentValue(position int) interface{} {
+	return ""
+}
+
+func (t *tester) ReturnValue(position int) interface{} {
+	return ""
+}
+
+type terrfn func(in string) error
+
+func (t terrfn) Call(args ...interface{}) ([]interface{}, error) {
+	return nil, t(*args[0].(*string))
+}
+
+func (t terrfn) NumArguments() int {
+	return 1
+}
+
+func (t terrfn) NumReturns() int {
+	return 0
+}
+
+func (t terrfn) ArgumentValue(position int) interface{} {
+	return ""
+}
+
+func (t terrfn) ReturnValue(position int) interface{} {
+	return ""
+}
+
+//SignalHandler
+func (t *tester) DeliverSignal(iface, name string, signal *Signal) {
+	intf, ok := t.subSigs[iface]
+	if !ok {
+		return
+	}
+	if _, ok := intf[name]; !ok {
+		return
+	}
+	t.sigs <- signal
+}
+
+func (t *tester) AddSignal(iface, name string) {
+	if i, ok := t.subSigs[iface]; ok {
+		i[name] = struct{}{}
+	} else {
+		t.subSigs[iface] = make(map[string]struct{})
+		t.subSigs[iface][name] = struct{}{}
+	}
+	t.conn.BusObject().(*Object).AddMatchSignal(
+		iface, name)
+}
+
+func (t *tester) Close() {
+	t.conn.Close()
+	close(t.sigs)
+}
+
+func (t *tester) Name() string {
+	return t.conn.Names()[0]
+}
+
+type intro_fn func() string
+
+func (intro intro_fn) Call(args ...interface{}) ([]interface{}, error) {
+	return []interface{}{intro()}, nil
+}
+
+func (_ intro_fn) NumArguments() int {
+	return 0
+}
+
+func (_ intro_fn) NumReturns() int {
+	return 1
+}
+
+func (_ intro_fn) ArgumentValue(position int) interface{} {
+	return nil
+}
+
+func (_ intro_fn) ReturnValue(position int) interface{} {
+	return ""
+}
+
+func newTester() (*tester, error) {
+	tester := &tester{
+		sigs:    make(chan *Signal),
+		subSigs: make(map[string]map[string]struct{}),
+	}
+	conn, err := SessionBusPrivateHandler(tester, tester)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		conn.Close()
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		conn.Close()
+		return nil, err
+	}
+	tester.conn = conn
+	return tester, nil
+}
+
+func TestHandlerCall(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester")
+	var out string
+	in := "foo"
+	err = obj.Call("com.github.godbus.dbus.Tester.Test", 0, in).Store(&out)
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	if out != in {
+		t.Errorf("Unexpected error: got %s, expected %s", out, in)
+	}
+	tester.Close()
+}
+
+func TestHandlerCallGenericError(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester")
+	var out string
+	in := "foo"
+	err = obj.Call("com.github.godbus.dbus.Tester.Error", 0, in).Store(&out)
+	if err != nil && err.(Error).Body[0].(string) != "foo" {
+		t.Errorf("Unexpected error: %s", err)
+	}
+
+	tester.Close()
+}
+
+func TestHandlerCallNonExistent(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester/nonexist")
+	var out string
+	in := "foo"
+	err = obj.Call("com.github.godbus.dbus.Tester.Test", 0, in).Store(&out)
+	if err != nil {
+		if err.Error() != "Object does not implement the interface" {
+			t.Errorf("Unexpected error: %s", err)
+		}
+	}
+	tester.Close()
+}
+
+func TestHandlerInvalidFunc(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester")
+	var out string
+	in := "foo"
+	err = obj.Call("com.github.godbus.dbus.Tester.Notexist", 0, in).Store(&out)
+	if err == nil {
+		t.Errorf("didn't get expected error")
+	}
+	tester.Close()
+}
+
+func TestHandlerInvalidNumArg(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester")
+	var out string
+	err = obj.Call("com.github.godbus.dbus.Tester.Test", 0).Store(&out)
+	if err == nil {
+		t.Errorf("didn't get expected error")
+	}
+	tester.Close()
+}
+
+func TestHandlerInvalidArgType(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester")
+	var out string
+	err = obj.Call("com.github.godbus.dbus.Tester.Test", 0, 2.10).Store(&out)
+	if err == nil {
+		t.Errorf("didn't get expected error")
+	}
+	tester.Close()
+}
+
+func TestHandlerIntrospect(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus/tester")
+	var out string
+	err = obj.Call("org.freedesktop.DBus.Introspectable.Introspect", 0).Store(&out)
+	expected := `<node>
+    <interface name="org.freedesktop.DBus.Introspectable.Introspect">
+        <method name="Introspect">
+            <arg name="out" type="i" direction="out">
+        </method>
+    </interface>
+    <interface name="com.github.godbus.dbus.Tester">
+        <method name="Test">
+            <arg name="in" type="i" direction="in">
+            <arg name="out" type="i" direction="out">
+        </method>
+        <signal name="sig1">
+            <arg name="out" type="i" direction="out">
+        </signal>
+    </interface>
+</node>`
+	if out != expected {
+		t.Errorf("didn't get expected return value, expected %s got %s", expected, out)
+	}
+	tester.Close()
+}
+
+func TestHandlerIntrospectPath(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	obj := conn.Object(tester.Name(), "/com/github/godbus")
+	var out string
+	err = obj.Call("org.freedesktop.DBus.Introspectable.Introspect", 0).Store(&out)
+	expected := `<node><node name="tester"></node></node>`
+	if out != expected {
+		t.Errorf("didn't get expected return value, expected %s got %s", expected, out)
+	}
+	tester.Close()
+}
+
+func TestHandlerSignal(t *testing.T) {
+	tester, err := newTester()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	conn, err := SessionBus()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	tester.AddSignal("com.github.godbus.dbus.Tester", "sig1")
+	conn.Emit("/com/github/godbus/tester",
+		"com.github.godbus.dbus.Tester.sig1", "foo")
+	select {
+	case sig := <-tester.sigs:
+		if sig.Body[0] != "foo" {
+			t.Errorf("Unexpected signal got %s, expected %s", sig.Body[0], "foo")
+		}
+	case <-time.After(time.Second * 10): //overly generous timeout
+		t.Errorf("Didn't receive a signal after 10 seconds")
+	}
+	tester.Close()
+}

vendor/github.com/godbus/dbus/sig.go

@@ -0,0 +1,259 @@
+package dbus
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+var sigToType = map[byte]reflect.Type{
+	'y': byteType,
+	'b': boolType,
+	'n': int16Type,
+	'q': uint16Type,
+	'i': int32Type,
+	'u': uint32Type,
+	'x': int64Type,
+	't': uint64Type,
+	'd': float64Type,
+	's': stringType,
+	'g': signatureType,
+	'o': objectPathType,
+	'v': variantType,
+	'h': unixFDIndexType,
+}
+
+// Signature represents a correct type signature as specified by the D-Bus
+// specification. The zero value represents the empty signature, "".
+type Signature struct {
+	str string
+}
+
+// SignatureOf returns the concatenation of all the signatures of the given
+// values. It panics if one of them is not representable in D-Bus.
+func SignatureOf(vs ...interface{}) Signature {
+	var s string
+	for _, v := range vs {
+		s += getSignature(reflect.TypeOf(v))
+	}
+	return Signature{s}
+}
+
+// SignatureOfType returns the signature of the given type. It panics if the
+// type is not representable in D-Bus.
+func SignatureOfType(t reflect.Type) Signature {
+	return Signature{getSignature(t)}
+}
+
+// getSignature returns the signature of the given type and panics on unknown types.
+func getSignature(t reflect.Type) string {
+	// handle simple types first
+	switch t.Kind() {
+	case reflect.Uint8:
+		return "y"
+	case reflect.Bool:
+		return "b"
+	case reflect.Int16:
+		return "n"
+	case reflect.Uint16:
+		return "q"
+	case reflect.Int, reflect.Int32:
+		if t == unixFDType {
+			return "h"
+		}
+		return "i"
+	case reflect.Uint, reflect.Uint32:
+		if t == unixFDIndexType {
+			return "h"
+		}
+		return "u"
+	case reflect.Int64:
+		return "x"
+	case reflect.Uint64:
+		return "t"
+	case reflect.Float64:
+		return "d"
+	case reflect.Ptr:
+		return getSignature(t.Elem())
+	case reflect.String:
+		if t == objectPathType {
+			return "o"
+		}
+		return "s"
+	case reflect.Struct:
+		if t == variantType {
+			return "v"
+		} else if t == signatureType {
+			return "g"
+		}
+		var s string
+		for i := 0; i < t.NumField(); i++ {
+			field := t.Field(i)
+			if field.PkgPath == "" && field.Tag.Get("dbus") != "-" {
+				s += getSignature(t.Field(i).Type)
+			}
+		}
+		return "(" + s + ")"
+	case reflect.Array, reflect.Slice:
+		return "a" + getSignature(t.Elem())
+	case reflect.Map:
+		if !isKeyType(t.Key()) {
+			panic(InvalidTypeError{t})
+		}
+		return "a{" + getSignature(t.Key()) + getSignature(t.Elem()) + "}"
+	case reflect.Interface:
+		return "v"
+	}
+	panic(InvalidTypeError{t})
+}
+
+// ParseSignature returns the signature represented by this string, or a
+// SignatureError if the string is not a valid signature.
+func ParseSignature(s string) (sig Signature, err error) {
+	if len(s) == 0 {
+		return
+	}
+	if len(s) > 255 {
+		return Signature{""}, SignatureError{s, "too long"}
+	}
+	sig.str = s
+	for err == nil && len(s) != 0 {
+		err, s = validSingle(s, 0)
+	}
+	if err != nil {
+		sig = Signature{""}
+	}
+
+	return
+}
+
+// ParseSignatureMust behaves like ParseSignature, except that it panics if s
+// is not valid.
+func ParseSignatureMust(s string) Signature {
+	sig, err := ParseSignature(s)
+	if err != nil {
+		panic(err)
+	}
+	return sig
+}
+
+// Empty retruns whether the signature is the empty signature.
+func (s Signature) Empty() bool {
+	return s.str == ""
+}
+
+// Single returns whether the signature represents a single, complete type.
+func (s Signature) Single() bool {
+	err, r := validSingle(s.str, 0)
+	return err != nil && r == ""
+}
+
+// String returns the signature's string representation.
+func (s Signature) String() string {
+	return s.str
+}
+
+// A SignatureError indicates that a signature passed to a function or received
+// on a connection is not a valid signature.
+type SignatureError struct {
+	Sig    string
+	Reason string
+}
+
+func (e SignatureError) Error() string {
+	return fmt.Sprintf("dbus: invalid signature: %q (%s)", e.Sig, e.Reason)
+}
+
+// Try to read a single type from this string. If it was successful, err is nil
+// and rem is the remaining unparsed part. Otherwise, err is a non-nil
+// SignatureError and rem is "". depth is the current recursion depth which may
+// not be greater than 64 and should be given as 0 on the first call.
+func validSingle(s string, depth int) (err error, rem string) {
+	if s == "" {
+		return SignatureError{Sig: s, Reason: "empty signature"}, ""
+	}
+	if depth > 64 {
+		return SignatureError{Sig: s, Reason: "container nesting too deep"}, ""
+	}
+	switch s[0] {
+	case 'y', 'b', 'n', 'q', 'i', 'u', 'x', 't', 'd', 's', 'g', 'o', 'v', 'h':
+		return nil, s[1:]
+	case 'a':
+		if len(s) > 1 && s[1] == '{' {
+			i := findMatching(s[1:], '{', '}')
+			if i == -1 {
+				return SignatureError{Sig: s, Reason: "unmatched '{'"}, ""
+			}
+			i++
+			rem = s[i+1:]
+			s = s[2:i]
+			if err, _ = validSingle(s[:1], depth+1); err != nil {
+				return err, ""
+			}
+			err, nr := validSingle(s[1:], depth+1)
+			if err != nil {
+				return err, ""
+			}
+			if nr != "" {
+				return SignatureError{Sig: s, Reason: "too many types in dict"}, ""
+			}
+			return nil, rem
+		}
+		return validSingle(s[1:], depth+1)
+	case '(':
+		i := findMatching(s, '(', ')')
+		if i == -1 {
+			return SignatureError{Sig: s, Reason: "unmatched ')'"}, ""
+		}
+		rem = s[i+1:]
+		s = s[1:i]
+		for err == nil && s != "" {
+			err, s = validSingle(s, depth+1)
+		}
+		if err != nil {
+			rem = ""
+		}
+		return
+	}
+	return SignatureError{Sig: s, Reason: "invalid type character"}, ""
+}
+
+func findMatching(s string, left, right rune) int {
+	n := 0
+	for i, v := range s {
+		if v == left {
+			n++
+		} else if v == right {
+			n--
+		}
+		if n == 0 {
+			return i
+		}
+	}
+	return -1
+}
+
+// typeFor returns the type of the given signature. It ignores any left over
+// characters and panics if s doesn't start with a valid type signature.
+func typeFor(s string) (t reflect.Type) {
+	err, _ := validSingle(s, 0)
+	if err != nil {
+		panic(err)
+	}
+
+	if t, ok := sigToType[s[0]]; ok {
+		return t
+	}
+	switch s[0] {
+	case 'a':
+		if s[1] == '{' {
+			i := strings.LastIndex(s, "}")
+			t = reflect.MapOf(sigToType[s[2]], typeFor(s[3:i]))
+		} else {
+			t = reflect.SliceOf(typeFor(s[1:]))
+		}
+	case '(':
+		t = interfacesType
+	}
+	return
+}

vendor/github.com/godbus/dbus/sig_test.go

@@ -0,0 +1,70 @@
+package dbus
+
+import (
+	"testing"
+)
+
+var sigTests = []struct {
+	vs  []interface{}
+	sig Signature
+}{
+	{
+		[]interface{}{new(int32)},
+		Signature{"i"},
+	},
+	{
+		[]interface{}{new(string)},
+		Signature{"s"},
+	},
+	{
+		[]interface{}{new(Signature)},
+		Signature{"g"},
+	},
+	{
+		[]interface{}{new([]int16)},
+		Signature{"an"},
+	},
+	{
+		[]interface{}{new(int16), new(uint32)},
+		Signature{"nu"},
+	},
+	{
+		[]interface{}{new(map[byte]Variant)},
+		Signature{"a{yv}"},
+	},
+	{
+		[]interface{}{new(Variant), new([]map[int32]string)},
+		Signature{"vaa{is}"},
+	},
+}
+
+func TestSig(t *testing.T) {
+	for i, v := range sigTests {
+		sig := SignatureOf(v.vs...)
+		if sig != v.sig {
+			t.Errorf("test %d: got %q, expected %q", i+1, sig.str, v.sig.str)
+		}
+	}
+}
+
+var getSigTest = []interface{}{
+	[]struct {
+		b byte
+		i int32
+		t uint64
+		s string
+	}{},
+	map[string]Variant{},
+}
+
+func BenchmarkGetSignatureSimple(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		SignatureOf("", int32(0))
+	}
+}
+
+func BenchmarkGetSignatureLong(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		SignatureOf(getSigTest...)
+	}
+}

vendor/github.com/godbus/dbus/store_test.go

@@ -0,0 +1,99 @@
+package dbus
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestStoreStringToInterface(t *testing.T) {
+	var dest interface{}
+	err := Store([]interface{}{"foobar"}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest.(string)
+}
+
+func TestStoreVariantToInterface(t *testing.T) {
+	src := MakeVariant("foobar")
+	var dest interface{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest.(string)
+}
+
+func TestStoreMapStringToMapInterface(t *testing.T) {
+	src := map[string]string{"foo": "bar"}
+	dest := map[string]interface{}{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest["foo"].(string)
+}
+
+func TestStoreMapVariantToMapInterface(t *testing.T) {
+	src := map[string]Variant{"foo": MakeVariant("foobar")}
+	dest := map[string]interface{}{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest["foo"].(string)
+}
+
+func TestStoreSliceStringToSliceInterface(t *testing.T) {
+	src := []string{"foo"}
+	dest := []interface{}{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest[0].(string)
+}
+
+func TestStoreSliceVariantToSliceInterface(t *testing.T) {
+	src := []Variant{MakeVariant("foo")}
+	dest := []interface{}{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest[0].(string)
+}
+
+func TestStoreSliceVariantToSliceInterfaceMulti(t *testing.T) {
+	src := []Variant{MakeVariant("foo"), MakeVariant(int32(1))}
+	dest := []interface{}{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = dest[0].(string)
+	_ = dest[1].(int32)
+}
+
+func TestStoreNested(t *testing.T) {
+	src := map[string]interface{}{
+		"foo": []interface{}{"1", "2", "3", "5",
+			map[string]interface{}{
+				"bar": "baz",
+			},
+		},
+		"bar": map[string]interface{}{
+			"baz":  "quux",
+			"quux": "quuz",
+		},
+	}
+	dest := map[string]interface{}{}
+	err := Store([]interface{}{src}, &dest)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(src, dest) {
+		t.Errorf("not equal: got '%v', want '%v'",
+			dest, src)
+	}
+}

vendor/github.com/godbus/dbus/transport_darwin.go

@@ -0,0 +1,6 @@
+package dbus
+
+func (t *unixTransport) SendNullByte() error {
+	_, err := t.Write([]byte{0})
+	return err
+}

vendor/github.com/godbus/dbus/transport_generic.go

@@ -0,0 +1,50 @@
+package dbus
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+	"unsafe"
+)
+
+var nativeEndian binary.ByteOrder
+
+func detectEndianness() binary.ByteOrder {
+	var x uint32 = 0x01020304
+		if *(*byte)(unsafe.Pointer(&x)) == 0x01 {
+		return binary.BigEndian
+	}
+	return binary.LittleEndian
+}
+
+func init() {
+	nativeEndian = detectEndianness()
+}
+
+type genericTransport struct {
+	io.ReadWriteCloser
+}
+
+func (t genericTransport) SendNullByte() error {
+	_, err := t.Write([]byte{0})
+	return err
+}
+
+func (t genericTransport) SupportsUnixFDs() bool {
+	return false
+}
+
+func (t genericTransport) EnableUnixFDs() {}
+
+func (t genericTransport) ReadMessage() (*Message, error) {
+	return DecodeMessage(t)
+}
+
+func (t genericTransport) SendMessage(msg *Message) error {
+	for _, v := range msg.Body {
+		if _, ok := v.(UnixFD); ok {
+			return errors.New("dbus: unix fd passing not enabled")
+		}
+	}
+	return msg.EncodeTo(t, nativeEndian)
+}

vendor/github.com/godbus/dbus/transport_tcp.go

@@ -0,0 +1,43 @@
+//+build !windows
+
+package dbus
+
+import (
+	"errors"
+	"net"
+)
+
+func init() {
+	transports["tcp"] = newTcpTransport
+}
+
+func tcpFamily(keys string) (string, error) {
+	switch getKey(keys, "family") {
+	case "":
+		return "tcp", nil
+	case "ipv4":
+		return "tcp4", nil
+	case "ipv6":
+		return "tcp6", nil
+	default:
+		return "", errors.New("dbus: invalid tcp family (must be ipv4 or ipv6)")
+	}
+}
+
+func newTcpTransport(keys string) (transport, error) {
+	host := getKey(keys, "host")
+	port := getKey(keys, "port")
+	if host == "" || port == "" {
+		return nil, errors.New("dbus: unsupported address (must set host and port)")
+	}
+
+	protocol, err := tcpFamily(keys)
+	if err != nil {
+		return nil, err
+	}
+	socket, err := net.Dial(protocol, net.JoinHostPort(host, port))
+	if err != nil {
+		return nil, err
+	}
+	return NewConn(socket)
+}

vendor/github.com/godbus/dbus/transport_tcp_test.go

@@ -0,0 +1,26 @@
+package dbus
+
+import (
+	"fmt"
+	"net"
+	"testing"
+)
+
+func TestTcpConnection(t *testing.T) {
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal("Failed to create listener")
+	}
+	host, port, err := net.SplitHostPort(listener.Addr().String())
+	if err != nil {
+		t.Fatal("Failed to parse host/port")
+	}
+
+	conn, err := Dial(fmt.Sprintf("tcp:host=%s,port=%s", host, port))
+	if err != nil {
+		t.Error("Expected no error, got", err)
+	}
+	if conn == nil {
+		t.Error("Expected connection, got nil")
+	}
+}

vendor/github.com/godbus/dbus/transport_unix.go

@@ -0,0 +1,196 @@
+//+build !windows,!solaris
+
+package dbus
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"syscall"
+)
+
+type oobReader struct {
+	conn *net.UnixConn
+	oob  []byte
+	buf  [4096]byte
+}
+
+func (o *oobReader) Read(b []byte) (n int, err error) {
+	n, oobn, flags, _, err := o.conn.ReadMsgUnix(b, o.buf[:])
+	if err != nil {
+		return n, err
+	}
+	if flags&syscall.MSG_CTRUNC != 0 {
+		return n, errors.New("dbus: control data truncated (too many fds received)")
+	}
+	o.oob = append(o.oob, o.buf[:oobn]...)
+	return n, nil
+}
+
+type unixTransport struct {
+	*net.UnixConn
+	hasUnixFDs bool
+}
+
+func newUnixTransport(keys string) (transport, error) {
+	var err error
+
+	t := new(unixTransport)
+	abstract := getKey(keys, "abstract")
+	path := getKey(keys, "path")
+	switch {
+	case abstract == "" && path == "":
+		return nil, errors.New("dbus: invalid address (neither path nor abstract set)")
+	case abstract != "" && path == "":
+		t.UnixConn, err = net.DialUnix("unix", nil, &net.UnixAddr{Name: "@" + abstract, Net: "unix"})
+		if err != nil {
+			return nil, err
+		}
+		return t, nil
+	case abstract == "" && path != "":
+		t.UnixConn, err = net.DialUnix("unix", nil, &net.UnixAddr{Name: path, Net: "unix"})
+		if err != nil {
+			return nil, err
+		}
+		return t, nil
+	default:
+		return nil, errors.New("dbus: invalid address (both path and abstract set)")
+	}
+}
+
+func init() {
+	transports["unix"] = newUnixTransport
+}
+
+func (t *unixTransport) EnableUnixFDs() {
+	t.hasUnixFDs = true
+}
+
+func (t *unixTransport) ReadMessage() (*Message, error) {
+	var (
+		blen, hlen uint32
+		csheader   [16]byte
+		headers    []header
+		order      binary.ByteOrder
+		unixfds    uint32
+	)
+	// To be sure that all bytes of out-of-band data are read, we use a special
+	// reader that uses ReadUnix on the underlying connection instead of Read
+	// and gathers the out-of-band data in a buffer.
+	rd := &oobReader{conn: t.UnixConn}
+	// read the first 16 bytes (the part of the header that has a constant size),
+	// from which we can figure out the length of the rest of the message
+	if _, err := io.ReadFull(rd, csheader[:]); err != nil {
+		return nil, err
+	}
+	switch csheader[0] {
+	case 'l':
+		order = binary.LittleEndian
+	case 'B':
+		order = binary.BigEndian
+	default:
+		return nil, InvalidMessageError("invalid byte order")
+	}
+	// csheader[4:8] -> length of message body, csheader[12:16] -> length of
+	// header fields (without alignment)
+	binary.Read(bytes.NewBuffer(csheader[4:8]), order, &blen)
+	binary.Read(bytes.NewBuffer(csheader[12:]), order, &hlen)
+	if hlen%8 != 0 {
+		hlen += 8 - (hlen % 8)
+	}
+
+	// decode headers and look for unix fds
+	headerdata := make([]byte, hlen+4)
+	copy(headerdata, csheader[12:])
+	if _, err := io.ReadFull(t, headerdata[4:]); err != nil {
+		return nil, err
+	}
+	dec := newDecoder(bytes.NewBuffer(headerdata), order)
+	dec.pos = 12
+	vs, err := dec.Decode(Signature{"a(yv)"})
+	if err != nil {
+		return nil, err
+	}
+	Store(vs, &headers)
+	for _, v := range headers {
+		if v.Field == byte(FieldUnixFDs) {
+			unixfds, _ = v.Variant.value.(uint32)
+		}
+	}
+	all := make([]byte, 16+hlen+blen)
+	copy(all, csheader[:])
+	copy(all[16:], headerdata[4:])
+	if _, err := io.ReadFull(rd, all[16+hlen:]); err != nil {
+		return nil, err
+	}
+	if unixfds != 0 {
+		if !t.hasUnixFDs {
+			return nil, errors.New("dbus: got unix fds on unsupported transport")
+		}
+		// read the fds from the OOB data
+		scms, err := syscall.ParseSocketControlMessage(rd.oob)
+		if err != nil {
+			return nil, err
+		}
+		if len(scms) != 1 {
+			return nil, errors.New("dbus: received more than one socket control message")
+		}
+		fds, err := syscall.ParseUnixRights(&scms[0])
+		if err != nil {
+			return nil, err
+		}
+		msg, err := DecodeMessage(bytes.NewBuffer(all))
+		if err != nil {
+			return nil, err
+		}
+		// substitute the values in the message body (which are indices for the
+		// array receiver via OOB) with the actual values
+		for i, v := range msg.Body {
+			if j, ok := v.(UnixFDIndex); ok {
+				if uint32(j) >= unixfds {
+					return nil, InvalidMessageError("invalid index for unix fd")
+				}
+				msg.Body[i] = UnixFD(fds[j])
+			}
+		}
+		return msg, nil
+	}
+	return DecodeMessage(bytes.NewBuffer(all))
+}
+
+func (t *unixTransport) SendMessage(msg *Message) error {
+	fds := make([]int, 0)
+	for i, v := range msg.Body {
+		if fd, ok := v.(UnixFD); ok {
+			msg.Body[i] = UnixFDIndex(len(fds))
+			fds = append(fds, int(fd))
+		}
+	}
+	if len(fds) != 0 {
+		if !t.hasUnixFDs {
+			return errors.New("dbus: unix fd passing not enabled")
+		}
+		msg.Headers[FieldUnixFDs] = MakeVariant(uint32(len(fds)))
+		oob := syscall.UnixRights(fds...)
+		buf := new(bytes.Buffer)
+		msg.EncodeTo(buf, nativeEndian)
+		n, oobn, err := t.UnixConn.WriteMsgUnix(buf.Bytes(), oob, nil)
+		if err != nil {
+			return err
+		}
+		if n != buf.Len() || oobn != len(oob) {
+			return io.ErrShortWrite
+		}
+	} else {
+		if err := msg.EncodeTo(t, nativeEndian); err != nil {
+			return nil
+		}
+	}
+	return nil
+}
+
+func (t *unixTransport) SupportsUnixFDs() bool {
+	return true
+}

vendor/github.com/godbus/dbus/transport_unix_test.go

@@ -0,0 +1,49 @@
+package dbus
+
+import (
+	"os"
+	"testing"
+)
+
+const testString = `This is a test!
+This text should be read from the file that is created by this test.`
+
+type unixFDTest struct{}
+
+func (t unixFDTest) Test(fd UnixFD) (string, *Error) {
+	var b [4096]byte
+	file := os.NewFile(uintptr(fd), "testfile")
+	defer file.Close()
+	n, err := file.Read(b[:])
+	if err != nil {
+		return "", &Error{"com.github.guelfey.test.Error", nil}
+	}
+	return string(b[:n]), nil
+}
+
+func TestUnixFDs(t *testing.T) {
+	conn, err := SessionBus()
+	if err != nil {
+		t.Fatal(err)
+	}
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer w.Close()
+	if _, err := w.Write([]byte(testString)); err != nil {
+		t.Fatal(err)
+	}
+	name := conn.Names()[0]
+	test := unixFDTest{}
+	conn.Export(test, "/com/github/guelfey/test", "com.github.guelfey.test")
+	var s string
+	obj := conn.Object(name, "/com/github/guelfey/test")
+	err = obj.Call("com.github.guelfey.test.Test", 0, UnixFD(r.Fd())).Store(&s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s != testString {
+		t.Fatal("got", s, "wanted", testString)
+	}
+}

vendor/github.com/godbus/dbus/transport_unixcred_dragonfly.go

@@ -0,0 +1,95 @@
+// The UnixCredentials system call is currently only implemented on Linux
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// https://golang.org/s/go1.4-syscall
+// http://code.google.com/p/go/source/browse/unix/sockcmsg_linux.go?repo=sys
+
+// Local implementation of the UnixCredentials system call for DragonFly BSD
+
+package dbus
+
+/*
+#include <sys/ucred.h>
+*/
+import "C"
+
+import (
+	"io"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// http://golang.org/src/pkg/syscall/ztypes_linux_amd64.go
+// http://golang.org/src/pkg/syscall/ztypes_dragonfly_amd64.go
+type Ucred struct {
+	Pid int32
+	Uid uint32
+	Gid uint32
+}
+
+// http://golang.org/src/pkg/syscall/types_linux.go
+// http://golang.org/src/pkg/syscall/types_dragonfly.go
+// https://github.com/DragonFlyBSD/DragonFlyBSD/blob/master/sys/sys/ucred.h
+const (
+	SizeofUcred = C.sizeof_struct_ucred
+)
+
+// http://golang.org/src/pkg/syscall/sockcmsg_unix.go
+func cmsgAlignOf(salen int) int {
+	// From http://golang.org/src/pkg/syscall/sockcmsg_unix.go
+	//salign := sizeofPtr
+	// NOTE: It seems like 64-bit Darwin and DragonFly BSD kernels
+	// still require 32-bit aligned access to network subsystem.
+	//if darwin64Bit || dragonfly64Bit {
+	//	salign = 4
+	//}
+	salign := 4
+	return (salen + salign - 1) & ^(salign - 1)
+}
+
+// http://golang.org/src/pkg/syscall/sockcmsg_unix.go
+func cmsgData(h *syscall.Cmsghdr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(unsafe.Pointer(h)) + uintptr(cmsgAlignOf(syscall.SizeofCmsghdr)))
+}
+
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// UnixCredentials encodes credentials into a socket control message
+// for sending to another process. This can be used for
+// authentication.
+func UnixCredentials(ucred *Ucred) []byte {
+	b := make([]byte, syscall.CmsgSpace(SizeofUcred))
+	h := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
+	h.Level = syscall.SOL_SOCKET
+	h.Type = syscall.SCM_CREDS
+	h.SetLen(syscall.CmsgLen(SizeofUcred))
+	*((*Ucred)(cmsgData(h))) = *ucred
+	return b
+}
+
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// ParseUnixCredentials decodes a socket control message that contains
+// credentials in a Ucred structure. To receive such a message, the
+// SO_PASSCRED option must be enabled on the socket.
+func ParseUnixCredentials(m *syscall.SocketControlMessage) (*Ucred, error) {
+	if m.Header.Level != syscall.SOL_SOCKET {
+		return nil, syscall.EINVAL
+	}
+	if m.Header.Type != syscall.SCM_CREDS {
+		return nil, syscall.EINVAL
+	}
+	ucred := *(*Ucred)(unsafe.Pointer(&m.Data[0]))
+	return &ucred, nil
+}
+
+func (t *unixTransport) SendNullByte() error {
+	ucred := &Ucred{Pid: int32(os.Getpid()), Uid: uint32(os.Getuid()), Gid: uint32(os.Getgid())}
+	b := UnixCredentials(ucred)
+	_, oobn, err := t.UnixConn.WriteMsgUnix([]byte{0}, b, nil)
+	if err != nil {
+		return err
+	}
+	if oobn != len(b) {
+		return io.ErrShortWrite
+	}
+	return nil
+}

vendor/github.com/godbus/dbus/transport_unixcred_freebsd.go

@@ -0,0 +1,91 @@
+// The UnixCredentials system call is currently only implemented on Linux
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// https://golang.org/s/go1.4-syscall
+// http://code.google.com/p/go/source/browse/unix/sockcmsg_linux.go?repo=sys
+
+// Local implementation of the UnixCredentials system call for FreeBSD
+
+package dbus
+
+/*
+const int sizeofPtr = sizeof(void*);
+#define _WANT_UCRED
+#include <sys/ucred.h>
+*/
+import "C"
+
+import (
+	"io"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// http://golang.org/src/pkg/syscall/ztypes_linux_amd64.go
+// https://golang.org/src/syscall/ztypes_freebsd_amd64.go
+type Ucred struct {
+	Pid int32
+	Uid uint32
+	Gid uint32
+}
+
+// http://golang.org/src/pkg/syscall/types_linux.go
+// https://golang.org/src/syscall/types_freebsd.go
+// https://github.com/freebsd/freebsd/blob/master/sys/sys/ucred.h
+const (
+	SizeofUcred = C.sizeof_struct_ucred
+)
+
+// http://golang.org/src/pkg/syscall/sockcmsg_unix.go
+func cmsgAlignOf(salen int) int {
+	salign := C.sizeofPtr
+
+	return (salen + salign - 1) & ^(salign - 1)
+}
+
+// http://golang.org/src/pkg/syscall/sockcmsg_unix.go
+func cmsgData(h *syscall.Cmsghdr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(unsafe.Pointer(h)) + uintptr(cmsgAlignOf(syscall.SizeofCmsghdr)))
+}
+
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// UnixCredentials encodes credentials into a socket control message
+// for sending to another process. This can be used for
+// authentication.
+func UnixCredentials(ucred *Ucred) []byte {
+	b := make([]byte, syscall.CmsgSpace(SizeofUcred))
+	h := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
+	h.Level = syscall.SOL_SOCKET
+	h.Type = syscall.SCM_CREDS
+	h.SetLen(syscall.CmsgLen(SizeofUcred))
+	*((*Ucred)(cmsgData(h))) = *ucred
+	return b
+}
+
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// ParseUnixCredentials decodes a socket control message that contains
+// credentials in a Ucred structure. To receive such a message, the
+// SO_PASSCRED option must be enabled on the socket.
+func ParseUnixCredentials(m *syscall.SocketControlMessage) (*Ucred, error) {
+	if m.Header.Level != syscall.SOL_SOCKET {
+		return nil, syscall.EINVAL
+	}
+	if m.Header.Type != syscall.SCM_CREDS {
+		return nil, syscall.EINVAL
+	}
+	ucred := *(*Ucred)(unsafe.Pointer(&m.Data[0]))
+	return &ucred, nil
+}
+
+func (t *unixTransport) SendNullByte() error {
+	ucred := &Ucred{Pid: int32(os.Getpid()), Uid: uint32(os.Getuid()), Gid: uint32(os.Getgid())}
+	b := UnixCredentials(ucred)
+	_, oobn, err := t.UnixConn.WriteMsgUnix([]byte{0}, b, nil)
+	if err != nil {
+		return err
+	}
+	if oobn != len(b) {
+		return io.ErrShortWrite
+	}
+	return nil
+}

vendor/github.com/godbus/dbus/transport_unixcred_linux.go

@@ -0,0 +1,25 @@
+// The UnixCredentials system call is currently only implemented on Linux
+// http://golang.org/src/pkg/syscall/sockcmsg_linux.go
+// https://golang.org/s/go1.4-syscall
+// http://code.google.com/p/go/source/browse/unix/sockcmsg_linux.go?repo=sys
+
+package dbus
+
+import (
+	"io"
+	"os"
+	"syscall"
+)
+
+func (t *unixTransport) SendNullByte() error {
+	ucred := &syscall.Ucred{Pid: int32(os.Getpid()), Uid: uint32(os.Getuid()), Gid: uint32(os.Getgid())}
+	b := syscall.UnixCredentials(ucred)
+	_, oobn, err := t.UnixConn.WriteMsgUnix([]byte{0}, b, nil)
+	if err != nil {
+		return err
+	}
+	if oobn != len(b) {
+		return io.ErrShortWrite
+	}
+	return nil
+}

vendor/github.com/godbus/dbus/transport_unixcred_openbsd.go

@@ -0,0 +1,14 @@
+package dbus
+
+import "io"
+
+func (t *unixTransport) SendNullByte() error {
+	n, _, err := t.UnixConn.WriteMsgUnix([]byte{0}, nil, nil)
+	if err != nil {
+		return err
+	}
+	if n != 1 {
+		return io.ErrShortWrite
+	}
+	return nil
+}

vendor/github.com/godbus/dbus/variant.go

@@ -0,0 +1,144 @@
+package dbus
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"sort"
+	"strconv"
+)
+
+// Variant represents the D-Bus variant type.
+type Variant struct {
+	sig   Signature
+	value interface{}
+}
+
+// MakeVariant converts the given value to a Variant. It panics if v cannot be
+// represented as a D-Bus type.
+func MakeVariant(v interface{}) Variant {
+	return MakeVariantWithSignature(v, SignatureOf(v))
+}
+
+// MakeVariantWithSignature converts the given value to a Variant.
+func MakeVariantWithSignature(v interface{}, s Signature) Variant {
+	return Variant{s, v}
+}
+
+// ParseVariant parses the given string as a variant as described at
+// https://developer.gnome.org/glib/unstable/gvariant-text.html. If sig is not
+// empty, it is taken to be the expected signature for the variant.
+func ParseVariant(s string, sig Signature) (Variant, error) {
+	tokens := varLex(s)
+	p := &varParser{tokens: tokens}
+	n, err := varMakeNode(p)
+	if err != nil {
+		return Variant{}, err
+	}
+	if sig.str == "" {
+		sig, err = varInfer(n)
+		if err != nil {
+			return Variant{}, err
+		}
+	}
+	v, err := n.Value(sig)
+	if err != nil {
+		return Variant{}, err
+	}
+	return MakeVariant(v), nil
+}
+
+// format returns a formatted version of v and whether this string can be parsed
+// unambigously.
+func (v Variant) format() (string, bool) {
+	switch v.sig.str[0] {
+	case 'b', 'i':
+		return fmt.Sprint(v.value), true
+	case 'n', 'q', 'u', 'x', 't', 'd', 'h':
+		return fmt.Sprint(v.value), false
+	case 's':
+		return strconv.Quote(v.value.(string)), true
+	case 'o':
+		return strconv.Quote(string(v.value.(ObjectPath))), false
+	case 'g':
+		return strconv.Quote(v.value.(Signature).str), false
+	case 'v':
+		s, unamb := v.value.(Variant).format()
+		if !unamb {
+			return "<@" + v.value.(Variant).sig.str + " " + s + ">", true
+		}
+		return "<" + s + ">", true
+	case 'y':
+		return fmt.Sprintf("%#x", v.value.(byte)), false
+	}
+	rv := reflect.ValueOf(v.value)
+	switch rv.Kind() {
+	case reflect.Slice:
+		if rv.Len() == 0 {
+			return "[]", false
+		}
+		unamb := true
+		buf := bytes.NewBuffer([]byte("["))
+		for i := 0; i < rv.Len(); i++ {
+			// TODO: slooow
+			s, b := MakeVariant(rv.Index(i).Interface()).format()
+			unamb = unamb && b
+			buf.WriteString(s)
+			if i != rv.Len()-1 {
+				buf.WriteString(", ")
+			}
+		}
+		buf.WriteByte(']')
+		return buf.String(), unamb
+	case reflect.Map:
+		if rv.Len() == 0 {
+			return "{}", false
+		}
+		unamb := true
+		var buf bytes.Buffer
+		kvs := make([]string, rv.Len())
+		for i, k := range rv.MapKeys() {
+			s, b := MakeVariant(k.Interface()).format()
+			unamb = unamb && b
+			buf.Reset()
+			buf.WriteString(s)
+			buf.WriteString(": ")
+			s, b = MakeVariant(rv.MapIndex(k).Interface()).format()
+			unamb = unamb && b
+			buf.WriteString(s)
+			kvs[i] = buf.String()
+		}
+		buf.Reset()
+		buf.WriteByte('{')
+		sort.Strings(kvs)
+		for i, kv := range kvs {
+			if i > 0 {
+				buf.WriteString(", ")
+			}
+			buf.WriteString(kv)
+		}
+		buf.WriteByte('}')
+		return buf.String(), unamb
+	}
+	return `"INVALID"`, true
+}
+
+// Signature returns the D-Bus signature of the underlying value of v.
+func (v Variant) Signature() Signature {
+	return v.sig
+}
+
+// String returns the string representation of the underlying value of v as
+// described at https://developer.gnome.org/glib/unstable/gvariant-text.html.
+func (v Variant) String() string {
+	s, unamb := v.format()
+	if !unamb {
+		return "@" + v.sig.str + " " + s
+	}
+	return s
+}
+
+// Value returns the underlying value of v.
+func (v Variant) Value() interface{} {
+	return v.value
+}

vendor/github.com/godbus/dbus/variant_lexer.go

@@ -0,0 +1,284 @@
+package dbus
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Heavily inspired by the lexer from text/template.
+
+type varToken struct {
+	typ varTokenType
+	val string
+}
+
+type varTokenType byte
+
+const (
+	tokEOF varTokenType = iota
+	tokError
+	tokNumber
+	tokString
+	tokBool
+	tokArrayStart
+	tokArrayEnd
+	tokDictStart
+	tokDictEnd
+	tokVariantStart
+	tokVariantEnd
+	tokComma
+	tokColon
+	tokType
+	tokByteString
+)
+
+type varLexer struct {
+	input  string
+	start  int
+	pos    int
+	width  int
+	tokens []varToken
+}
+
+type lexState func(*varLexer) lexState
+
+func varLex(s string) []varToken {
+	l := &varLexer{input: s}
+	l.run()
+	return l.tokens
+}
+
+func (l *varLexer) accept(valid string) bool {
+	if strings.IndexRune(valid, l.next()) >= 0 {
+		return true
+	}
+	l.backup()
+	return false
+}
+
+func (l *varLexer) backup() {
+	l.pos -= l.width
+}
+
+func (l *varLexer) emit(t varTokenType) {
+	l.tokens = append(l.tokens, varToken{t, l.input[l.start:l.pos]})
+	l.start = l.pos
+}
+
+func (l *varLexer) errorf(format string, v ...interface{}) lexState {
+	l.tokens = append(l.tokens, varToken{
+		tokError,
+		fmt.Sprintf(format, v...),
+	})
+	return nil
+}
+
+func (l *varLexer) ignore() {
+	l.start = l.pos
+}
+
+func (l *varLexer) next() rune {
+	var r rune
+
+	if l.pos >= len(l.input) {
+		l.width = 0
+		return -1
+	}
+	r, l.width = utf8.DecodeRuneInString(l.input[l.pos:])
+	l.pos += l.width
+	return r
+}
+
+func (l *varLexer) run() {
+	for state := varLexNormal; state != nil; {
+		state = state(l)
+	}
+}
+
+func (l *varLexer) peek() rune {
+	r := l.next()
+	l.backup()
+	return r
+}
+
+func varLexNormal(l *varLexer) lexState {
+	for {
+		r := l.next()
+		switch {
+		case r == -1:
+			l.emit(tokEOF)
+			return nil
+		case r == '[':
+			l.emit(tokArrayStart)
+		case r == ']':
+			l.emit(tokArrayEnd)
+		case r == '{':
+			l.emit(tokDictStart)
+		case r == '}':
+			l.emit(tokDictEnd)
+		case r == '<':
+			l.emit(tokVariantStart)
+		case r == '>':
+			l.emit(tokVariantEnd)
+		case r == ':':
+			l.emit(tokColon)
+		case r == ',':
+			l.emit(tokComma)
+		case r == '\'' || r == '"':
+			l.backup()
+			return varLexString
+		case r == '@':
+			l.backup()
+			return varLexType
+		case unicode.IsSpace(r):
+			l.ignore()
+		case unicode.IsNumber(r) || r == '+' || r == '-':
+			l.backup()
+			return varLexNumber
+		case r == 'b':
+			pos := l.start
+			if n := l.peek(); n == '"' || n == '\'' {
+				return varLexByteString
+			}
+			// not a byte string; try to parse it as a type or bool below
+			l.pos = pos + 1
+			l.width = 1
+			fallthrough
+		default:
+			// either a bool or a type. Try bools first.
+			l.backup()
+			if l.pos+4 <= len(l.input) {
+				if l.input[l.pos:l.pos+4] == "true" {
+					l.pos += 4
+					l.emit(tokBool)
+					continue
+				}
+			}
+			if l.pos+5 <= len(l.input) {
+				if l.input[l.pos:l.pos+5] == "false" {
+					l.pos += 5
+					l.emit(tokBool)
+					continue
+				}
+			}
+			// must be a type.
+			return varLexType
+		}
+	}
+}
+
+var varTypeMap = map[string]string{
+	"boolean":    "b",
+	"byte":       "y",
+	"int16":      "n",
+	"uint16":     "q",
+	"int32":      "i",
+	"uint32":     "u",
+	"int64":      "x",
+	"uint64":     "t",
+	"double":     "f",
+	"string":     "s",
+	"objectpath": "o",
+	"signature":  "g",
+}
+
+func varLexByteString(l *varLexer) lexState {
+	q := l.next()
+Loop:
+	for {
+		switch l.next() {
+		case '\\':
+			if r := l.next(); r != -1 {
+				break
+			}
+			fallthrough
+		case -1:
+			return l.errorf("unterminated bytestring")
+		case q:
+			break Loop
+		}
+	}
+	l.emit(tokByteString)
+	return varLexNormal
+}
+
+func varLexNumber(l *varLexer) lexState {
+	l.accept("+-")
+	digits := "0123456789"
+	if l.accept("0") {
+		if l.accept("x") {
+			digits = "0123456789abcdefABCDEF"
+		} else {
+			digits = "01234567"
+		}
+	}
+	for strings.IndexRune(digits, l.next()) >= 0 {
+	}
+	l.backup()
+	if l.accept(".") {
+		for strings.IndexRune(digits, l.next()) >= 0 {
+		}
+		l.backup()
+	}
+	if l.accept("eE") {
+		l.accept("+-")
+		for strings.IndexRune("0123456789", l.next()) >= 0 {
+		}
+		l.backup()
+	}
+	if r := l.peek(); unicode.IsLetter(r) {
+		l.next()
+		return l.errorf("bad number syntax: %q", l.input[l.start:l.pos])
+	}
+	l.emit(tokNumber)
+	return varLexNormal
+}
+
+func varLexString(l *varLexer) lexState {
+	q := l.next()
+Loop:
+	for {
+		switch l.next() {
+		case '\\':
+			if r := l.next(); r != -1 {
+				break
+			}
+			fallthrough
+		case -1:
+			return l.errorf("unterminated string")
+		case q:
+			break Loop
+		}
+	}
+	l.emit(tokString)
+	return varLexNormal
+}
+
+func varLexType(l *varLexer) lexState {
+	at := l.accept("@")
+	for {
+		r := l.next()
+		if r == -1 {
+			break
+		}
+		if unicode.IsSpace(r) {
+			l.backup()
+			break
+		}
+	}
+	if at {
+		if _, err := ParseSignature(l.input[l.start+1 : l.pos]); err != nil {
+			return l.errorf("%s", err)
+		}
+	} else {
+		if _, ok := varTypeMap[l.input[l.start:l.pos]]; ok {
+			l.emit(tokType)
+			return varLexNormal
+		}
+		return l.errorf("unrecognized type %q", l.input[l.start:l.pos])
+	}
+	l.emit(tokType)
+	return varLexNormal
+}

vendor/github.com/godbus/dbus/variant_parser.go

@@ -0,0 +1,817 @@
+package dbus
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"reflect"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+)
+
+type varParser struct {
+	tokens []varToken
+	i      int
+}
+
+func (p *varParser) backup() {
+	p.i--
+}
+
+func (p *varParser) next() varToken {
+	if p.i < len(p.tokens) {
+		t := p.tokens[p.i]
+		p.i++
+		return t
+	}
+	return varToken{typ: tokEOF}
+}
+
+type varNode interface {
+	Infer() (Signature, error)
+	String() string
+	Sigs() sigSet
+	Value(Signature) (interface{}, error)
+}
+
+func varMakeNode(p *varParser) (varNode, error) {
+	var sig Signature
+
+	for {
+		t := p.next()
+		switch t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		case tokNumber:
+			return varMakeNumNode(t, sig)
+		case tokString:
+			return varMakeStringNode(t, sig)
+		case tokBool:
+			if sig.str != "" && sig.str != "b" {
+				return nil, varTypeError{t.val, sig}
+			}
+			b, err := strconv.ParseBool(t.val)
+			if err != nil {
+				return nil, err
+			}
+			return boolNode(b), nil
+		case tokArrayStart:
+			return varMakeArrayNode(p, sig)
+		case tokVariantStart:
+			return varMakeVariantNode(p, sig)
+		case tokDictStart:
+			return varMakeDictNode(p, sig)
+		case tokType:
+			if sig.str != "" {
+				return nil, errors.New("unexpected type annotation")
+			}
+			if t.val[0] == '@' {
+				sig.str = t.val[1:]
+			} else {
+				sig.str = varTypeMap[t.val]
+			}
+		case tokByteString:
+			if sig.str != "" && sig.str != "ay" {
+				return nil, varTypeError{t.val, sig}
+			}
+			b, err := varParseByteString(t.val)
+			if err != nil {
+				return nil, err
+			}
+			return byteStringNode(b), nil
+		default:
+			return nil, fmt.Errorf("unexpected %q", t.val)
+		}
+	}
+}
+
+type varTypeError struct {
+	val string
+	sig Signature
+}
+
+func (e varTypeError) Error() string {
+	return fmt.Sprintf("dbus: can't parse %q as type %q", e.val, e.sig.str)
+}
+
+type sigSet map[Signature]bool
+
+func (s sigSet) Empty() bool {
+	return len(s) == 0
+}
+
+func (s sigSet) Intersect(s2 sigSet) sigSet {
+	r := make(sigSet)
+	for k := range s {
+		if s2[k] {
+			r[k] = true
+		}
+	}
+	return r
+}
+
+func (s sigSet) Single() (Signature, bool) {
+	if len(s) == 1 {
+		for k := range s {
+			return k, true
+		}
+	}
+	return Signature{}, false
+}
+
+func (s sigSet) ToArray() sigSet {
+	r := make(sigSet, len(s))
+	for k := range s {
+		r[Signature{"a" + k.str}] = true
+	}
+	return r
+}
+
+type numNode struct {
+	sig Signature
+	str string
+	val interface{}
+}
+
+var numSigSet = sigSet{
+	Signature{"y"}: true,
+	Signature{"n"}: true,
+	Signature{"q"}: true,
+	Signature{"i"}: true,
+	Signature{"u"}: true,
+	Signature{"x"}: true,
+	Signature{"t"}: true,
+	Signature{"d"}: true,
+}
+
+func (n numNode) Infer() (Signature, error) {
+	if strings.ContainsAny(n.str, ".e") {
+		return Signature{"d"}, nil
+	}
+	return Signature{"i"}, nil
+}
+
+func (n numNode) String() string {
+	return n.str
+}
+
+func (n numNode) Sigs() sigSet {
+	if n.sig.str != "" {
+		return sigSet{n.sig: true}
+	}
+	if strings.ContainsAny(n.str, ".e") {
+		return sigSet{Signature{"d"}: true}
+	}
+	return numSigSet
+}
+
+func (n numNode) Value(sig Signature) (interface{}, error) {
+	if n.sig.str != "" && n.sig != sig {
+		return nil, varTypeError{n.str, sig}
+	}
+	if n.val != nil {
+		return n.val, nil
+	}
+	return varNumAs(n.str, sig)
+}
+
+func varMakeNumNode(tok varToken, sig Signature) (varNode, error) {
+	if sig.str == "" {
+		return numNode{str: tok.val}, nil
+	}
+	num, err := varNumAs(tok.val, sig)
+	if err != nil {
+		return nil, err
+	}
+	return numNode{sig: sig, val: num}, nil
+}
+
+func varNumAs(s string, sig Signature) (interface{}, error) {
+	isUnsigned := false
+	size := 32
+	switch sig.str {
+	case "n":
+		size = 16
+	case "i":
+	case "x":
+		size = 64
+	case "y":
+		size = 8
+		isUnsigned = true
+	case "q":
+		size = 16
+		isUnsigned = true
+	case "u":
+		isUnsigned = true
+	case "t":
+		size = 64
+		isUnsigned = true
+	case "d":
+		d, err := strconv.ParseFloat(s, 64)
+		if err != nil {
+			return nil, err
+		}
+		return d, nil
+	default:
+		return nil, varTypeError{s, sig}
+	}
+	base := 10
+	if strings.HasPrefix(s, "0x") {
+		base = 16
+		s = s[2:]
+	}
+	if strings.HasPrefix(s, "0") && len(s) != 1 {
+		base = 8
+		s = s[1:]
+	}
+	if isUnsigned {
+		i, err := strconv.ParseUint(s, base, size)
+		if err != nil {
+			return nil, err
+		}
+		var v interface{} = i
+		switch sig.str {
+		case "y":
+			v = byte(i)
+		case "q":
+			v = uint16(i)
+		case "u":
+			v = uint32(i)
+		}
+		return v, nil
+	}
+	i, err := strconv.ParseInt(s, base, size)
+	if err != nil {
+		return nil, err
+	}
+	var v interface{} = i
+	switch sig.str {
+	case "n":
+		v = int16(i)
+	case "i":
+		v = int32(i)
+	}
+	return v, nil
+}
+
+type stringNode struct {
+	sig Signature
+	str string      // parsed
+	val interface{} // has correct type
+}
+
+var stringSigSet = sigSet{
+	Signature{"s"}: true,
+	Signature{"g"}: true,
+	Signature{"o"}: true,
+}
+
+func (n stringNode) Infer() (Signature, error) {
+	return Signature{"s"}, nil
+}
+
+func (n stringNode) String() string {
+	return n.str
+}
+
+func (n stringNode) Sigs() sigSet {
+	if n.sig.str != "" {
+		return sigSet{n.sig: true}
+	}
+	return stringSigSet
+}
+
+func (n stringNode) Value(sig Signature) (interface{}, error) {
+	if n.sig.str != "" && n.sig != sig {
+		return nil, varTypeError{n.str, sig}
+	}
+	if n.val != nil {
+		return n.val, nil
+	}
+	switch {
+	case sig.str == "g":
+		return Signature{n.str}, nil
+	case sig.str == "o":
+		return ObjectPath(n.str), nil
+	case sig.str == "s":
+		return n.str, nil
+	default:
+		return nil, varTypeError{n.str, sig}
+	}
+}
+
+func varMakeStringNode(tok varToken, sig Signature) (varNode, error) {
+	if sig.str != "" && sig.str != "s" && sig.str != "g" && sig.str != "o" {
+		return nil, fmt.Errorf("invalid type %q for string", sig.str)
+	}
+	s, err := varParseString(tok.val)
+	if err != nil {
+		return nil, err
+	}
+	n := stringNode{str: s}
+	if sig.str == "" {
+		return stringNode{str: s}, nil
+	}
+	n.sig = sig
+	switch sig.str {
+	case "o":
+		n.val = ObjectPath(s)
+	case "g":
+		n.val = Signature{s}
+	case "s":
+		n.val = s
+	}
+	return n, nil
+}
+
+func varParseString(s string) (string, error) {
+	// quotes are guaranteed to be there
+	s = s[1 : len(s)-1]
+	buf := new(bytes.Buffer)
+	for len(s) != 0 {
+		r, size := utf8.DecodeRuneInString(s)
+		if r == utf8.RuneError && size == 1 {
+			return "", errors.New("invalid UTF-8")
+		}
+		s = s[size:]
+		if r != '\\' {
+			buf.WriteRune(r)
+			continue
+		}
+		r, size = utf8.DecodeRuneInString(s)
+		if r == utf8.RuneError && size == 1 {
+			return "", errors.New("invalid UTF-8")
+		}
+		s = s[size:]
+		switch r {
+		case 'a':
+			buf.WriteRune(0x7)
+		case 'b':
+			buf.WriteRune(0x8)
+		case 'f':
+			buf.WriteRune(0xc)
+		case 'n':
+			buf.WriteRune('\n')
+		case 'r':
+			buf.WriteRune('\r')
+		case 't':
+			buf.WriteRune('\t')
+		case '\n':
+		case 'u':
+			if len(s) < 4 {
+				return "", errors.New("short unicode escape")
+			}
+			r, err := strconv.ParseUint(s[:4], 16, 32)
+			if err != nil {
+				return "", err
+			}
+			buf.WriteRune(rune(r))
+			s = s[4:]
+		case 'U':
+			if len(s) < 8 {
+				return "", errors.New("short unicode escape")
+			}
+			r, err := strconv.ParseUint(s[:8], 16, 32)
+			if err != nil {
+				return "", err
+			}
+			buf.WriteRune(rune(r))
+			s = s[8:]
+		default:
+			buf.WriteRune(r)
+		}
+	}
+	return buf.String(), nil
+}
+
+var boolSigSet = sigSet{Signature{"b"}: true}
+
+type boolNode bool
+
+func (boolNode) Infer() (Signature, error) {
+	return Signature{"b"}, nil
+}
+
+func (b boolNode) String() string {
+	if b {
+		return "true"
+	}
+	return "false"
+}
+
+func (boolNode) Sigs() sigSet {
+	return boolSigSet
+}
+
+func (b boolNode) Value(sig Signature) (interface{}, error) {
+	if sig.str != "b" {
+		return nil, varTypeError{b.String(), sig}
+	}
+	return bool(b), nil
+}
+
+type arrayNode struct {
+	set      sigSet
+	children []varNode
+	val      interface{}
+}
+
+func (n arrayNode) Infer() (Signature, error) {
+	for _, v := range n.children {
+		csig, err := varInfer(v)
+		if err != nil {
+			continue
+		}
+		return Signature{"a" + csig.str}, nil
+	}
+	return Signature{}, fmt.Errorf("can't infer type for %q", n.String())
+}
+
+func (n arrayNode) String() string {
+	s := "["
+	for i, v := range n.children {
+		s += v.String()
+		if i != len(n.children)-1 {
+			s += ", "
+		}
+	}
+	return s + "]"
+}
+
+func (n arrayNode) Sigs() sigSet {
+	return n.set
+}
+
+func (n arrayNode) Value(sig Signature) (interface{}, error) {
+	if n.set.Empty() {
+		// no type information whatsoever, so this must be an empty slice
+		return reflect.MakeSlice(typeFor(sig.str), 0, 0).Interface(), nil
+	}
+	if !n.set[sig] {
+		return nil, varTypeError{n.String(), sig}
+	}
+	s := reflect.MakeSlice(typeFor(sig.str), len(n.children), len(n.children))
+	for i, v := range n.children {
+		rv, err := v.Value(Signature{sig.str[1:]})
+		if err != nil {
+			return nil, err
+		}
+		s.Index(i).Set(reflect.ValueOf(rv))
+	}
+	return s.Interface(), nil
+}
+
+func varMakeArrayNode(p *varParser, sig Signature) (varNode, error) {
+	var n arrayNode
+	if sig.str != "" {
+		n.set = sigSet{sig: true}
+	}
+	if t := p.next(); t.typ == tokArrayEnd {
+		return n, nil
+	} else {
+		p.backup()
+	}
+Loop:
+	for {
+		t := p.next()
+		switch t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		}
+		p.backup()
+		cn, err := varMakeNode(p)
+		if err != nil {
+			return nil, err
+		}
+		if cset := cn.Sigs(); !cset.Empty() {
+			if n.set.Empty() {
+				n.set = cset.ToArray()
+			} else {
+				nset := cset.ToArray().Intersect(n.set)
+				if nset.Empty() {
+					return nil, fmt.Errorf("can't parse %q with given type information", cn.String())
+				}
+				n.set = nset
+			}
+		}
+		n.children = append(n.children, cn)
+		switch t := p.next(); t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		case tokArrayEnd:
+			break Loop
+		case tokComma:
+			continue
+		default:
+			return nil, fmt.Errorf("unexpected %q", t.val)
+		}
+	}
+	return n, nil
+}
+
+type variantNode struct {
+	n varNode
+}
+
+var variantSet = sigSet{
+	Signature{"v"}: true,
+}
+
+func (variantNode) Infer() (Signature, error) {
+	return Signature{"v"}, nil
+}
+
+func (n variantNode) String() string {
+	return "<" + n.n.String() + ">"
+}
+
+func (variantNode) Sigs() sigSet {
+	return variantSet
+}
+
+func (n variantNode) Value(sig Signature) (interface{}, error) {
+	if sig.str != "v" {
+		return nil, varTypeError{n.String(), sig}
+	}
+	sig, err := varInfer(n.n)
+	if err != nil {
+		return nil, err
+	}
+	v, err := n.n.Value(sig)
+	if err != nil {
+		return nil, err
+	}
+	return MakeVariant(v), nil
+}
+
+func varMakeVariantNode(p *varParser, sig Signature) (varNode, error) {
+	n, err := varMakeNode(p)
+	if err != nil {
+		return nil, err
+	}
+	if t := p.next(); t.typ != tokVariantEnd {
+		return nil, fmt.Errorf("unexpected %q", t.val)
+	}
+	vn := variantNode{n}
+	if sig.str != "" && sig.str != "v" {
+		return nil, varTypeError{vn.String(), sig}
+	}
+	return variantNode{n}, nil
+}
+
+type dictEntry struct {
+	key, val varNode
+}
+
+type dictNode struct {
+	kset, vset sigSet
+	children   []dictEntry
+	val        interface{}
+}
+
+func (n dictNode) Infer() (Signature, error) {
+	for _, v := range n.children {
+		ksig, err := varInfer(v.key)
+		if err != nil {
+			continue
+		}
+		vsig, err := varInfer(v.val)
+		if err != nil {
+			continue
+		}
+		return Signature{"a{" + ksig.str + vsig.str + "}"}, nil
+	}
+	return Signature{}, fmt.Errorf("can't infer type for %q", n.String())
+}
+
+func (n dictNode) String() string {
+	s := "{"
+	for i, v := range n.children {
+		s += v.key.String() + ": " + v.val.String()
+		if i != len(n.children)-1 {
+			s += ", "
+		}
+	}
+	return s + "}"
+}
+
+func (n dictNode) Sigs() sigSet {
+	r := sigSet{}
+	for k := range n.kset {
+		for v := range n.vset {
+			sig := "a{" + k.str + v.str + "}"
+			r[Signature{sig}] = true
+		}
+	}
+	return r
+}
+
+func (n dictNode) Value(sig Signature) (interface{}, error) {
+	set := n.Sigs()
+	if set.Empty() {
+		// no type information -> empty dict
+		return reflect.MakeMap(typeFor(sig.str)).Interface(), nil
+	}
+	if !set[sig] {
+		return nil, varTypeError{n.String(), sig}
+	}
+	m := reflect.MakeMap(typeFor(sig.str))
+	ksig := Signature{sig.str[2:3]}
+	vsig := Signature{sig.str[3 : len(sig.str)-1]}
+	for _, v := range n.children {
+		kv, err := v.key.Value(ksig)
+		if err != nil {
+			return nil, err
+		}
+		vv, err := v.val.Value(vsig)
+		if err != nil {
+			return nil, err
+		}
+		m.SetMapIndex(reflect.ValueOf(kv), reflect.ValueOf(vv))
+	}
+	return m.Interface(), nil
+}
+
+func varMakeDictNode(p *varParser, sig Signature) (varNode, error) {
+	var n dictNode
+
+	if sig.str != "" {
+		if len(sig.str) < 5 {
+			return nil, fmt.Errorf("invalid signature %q for dict type", sig)
+		}
+		ksig := Signature{string(sig.str[2])}
+		vsig := Signature{sig.str[3 : len(sig.str)-1]}
+		n.kset = sigSet{ksig: true}
+		n.vset = sigSet{vsig: true}
+	}
+	if t := p.next(); t.typ == tokDictEnd {
+		return n, nil
+	} else {
+		p.backup()
+	}
+Loop:
+	for {
+		t := p.next()
+		switch t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		}
+		p.backup()
+		kn, err := varMakeNode(p)
+		if err != nil {
+			return nil, err
+		}
+		if kset := kn.Sigs(); !kset.Empty() {
+			if n.kset.Empty() {
+				n.kset = kset
+			} else {
+				n.kset = kset.Intersect(n.kset)
+				if n.kset.Empty() {
+					return nil, fmt.Errorf("can't parse %q with given type information", kn.String())
+				}
+			}
+		}
+		t = p.next()
+		switch t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		case tokColon:
+		default:
+			return nil, fmt.Errorf("unexpected %q", t.val)
+		}
+		t = p.next()
+		switch t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		}
+		p.backup()
+		vn, err := varMakeNode(p)
+		if err != nil {
+			return nil, err
+		}
+		if vset := vn.Sigs(); !vset.Empty() {
+			if n.vset.Empty() {
+				n.vset = vset
+			} else {
+				n.vset = n.vset.Intersect(vset)
+				if n.vset.Empty() {
+					return nil, fmt.Errorf("can't parse %q with given type information", vn.String())
+				}
+			}
+		}
+		n.children = append(n.children, dictEntry{kn, vn})
+		t = p.next()
+		switch t.typ {
+		case tokEOF:
+			return nil, io.ErrUnexpectedEOF
+		case tokError:
+			return nil, errors.New(t.val)
+		case tokDictEnd:
+			break Loop
+		case tokComma:
+			continue
+		default:
+			return nil, fmt.Errorf("unexpected %q", t.val)
+		}
+	}
+	return n, nil
+}
+
+type byteStringNode []byte
+
+var byteStringSet = sigSet{
+	Signature{"ay"}: true,
+}
+
+func (byteStringNode) Infer() (Signature, error) {
+	return Signature{"ay"}, nil
+}
+
+func (b byteStringNode) String() string {
+	return string(b)
+}
+
+func (b byteStringNode) Sigs() sigSet {
+	return byteStringSet
+}
+
+func (b byteStringNode) Value(sig Signature) (interface{}, error) {
+	if sig.str != "ay" {
+		return nil, varTypeError{b.String(), sig}
+	}
+	return []byte(b), nil
+}
+
+func varParseByteString(s string) ([]byte, error) {
+	// quotes and b at start are guaranteed to be there
+	b := make([]byte, 0, 1)
+	s = s[2 : len(s)-1]
+	for len(s) != 0 {
+		c := s[0]
+		s = s[1:]
+		if c != '\\' {
+			b = append(b, c)
+			continue
+		}
+		c = s[0]
+		s = s[1:]
+		switch c {
+		case 'a':
+			b = append(b, 0x7)
+		case 'b':
+			b = append(b, 0x8)
+		case 'f':
+			b = append(b, 0xc)
+		case 'n':
+			b = append(b, '\n')
+		case 'r':
+			b = append(b, '\r')
+		case 't':
+			b = append(b, '\t')
+		case 'x':
+			if len(s) < 2 {
+				return nil, errors.New("short escape")
+			}
+			n, err := strconv.ParseUint(s[:2], 16, 8)
+			if err != nil {
+				return nil, err
+			}
+			b = append(b, byte(n))
+			s = s[2:]
+		case '0':
+			if len(s) < 3 {
+				return nil, errors.New("short escape")
+			}
+			n, err := strconv.ParseUint(s[:3], 8, 8)
+			if err != nil {
+				return nil, err
+			}
+			b = append(b, byte(n))
+			s = s[3:]
+		default:
+			b = append(b, c)
+		}
+	}
+	return append(b, 0), nil
+}
+
+func varInfer(n varNode) (Signature, error) {
+	if sig, ok := n.Sigs().Single(); ok {
+		return sig, nil
+	}
+	return n.Infer()
+}

vendor/github.com/godbus/dbus/variant_test.go

@@ -0,0 +1,78 @@
+package dbus
+
+import "reflect"
+import "testing"
+
+var variantFormatTests = []struct {
+	v interface{}
+	s string
+}{
+	{int32(1), `1`},
+	{"foo", `"foo"`},
+	{ObjectPath("/org/foo"), `@o "/org/foo"`},
+	{Signature{"i"}, `@g "i"`},
+	{[]byte{}, `@ay []`},
+	{[]int32{1, 2}, `[1, 2]`},
+	{[]int64{1, 2}, `@ax [1, 2]`},
+	{[][]int32{{3, 4}, {5, 6}}, `[[3, 4], [5, 6]]`},
+	{[]Variant{MakeVariant(int32(1)), MakeVariant(1.0)}, `[<1>, <@d 1>]`},
+	{map[string]int32{"one": 1, "two": 2}, `{"one": 1, "two": 2}`},
+	{map[int32]ObjectPath{1: "/org/foo"}, `@a{io} {1: "/org/foo"}`},
+	{map[string]Variant{}, `@a{sv} {}`},
+}
+
+func TestFormatVariant(t *testing.T) {
+	for i, v := range variantFormatTests {
+		if s := MakeVariant(v.v).String(); s != v.s {
+			t.Errorf("test %d: got %q, wanted %q", i+1, s, v.s)
+		}
+	}
+}
+
+var variantParseTests = []struct {
+	s string
+	v interface{}
+}{
+	{"1", int32(1)},
+	{"true", true},
+	{"false", false},
+	{"1.0", float64(1.0)},
+	{"0x10", int32(16)},
+	{"1e1", float64(10)},
+	{`"foo"`, "foo"},
+	{`"\a\b\f\n\r\t"`, "\x07\x08\x0c\n\r\t"},
+	{`"\u00e4\U0001f603"`, "\u00e4\U0001f603"},
+	{"[1]", []int32{1}},
+	{"[1, 2, 3]", []int32{1, 2, 3}},
+	{"@ai []", []int32{}},
+	{"[1, 5.0]", []float64{1, 5.0}},
+	{"[[1, 2], [3, 4.0]]", [][]float64{{1, 2}, {3, 4}}},
+	{`[@o "/org/foo", "/org/bar"]`, []ObjectPath{"/org/foo", "/org/bar"}},
+	{"<1>", MakeVariant(int32(1))},
+	{"[<1>, <2.0>]", []Variant{MakeVariant(int32(1)), MakeVariant(2.0)}},
+	{`[[], [""]]`, [][]string{{}, {""}}},
+	{`@a{ss} {}`, map[string]string{}},
+	{`{"foo": 1}`, map[string]int32{"foo": 1}},
+	{`[{}, {"foo": "bar"}]`, []map[string]string{{}, {"foo": "bar"}}},
+	{`{"a": <1>, "b": <"foo">}`,
+		map[string]Variant{"a": MakeVariant(int32(1)), "b": MakeVariant("foo")}},
+	{`b''`, []byte{0}},
+	{`b"abc"`, []byte{'a', 'b', 'c', 0}},
+	{`b"\x01\0002\a\b\f\n\r\t"`, []byte{1, 2, 0x7, 0x8, 0xc, '\n', '\r', '\t', 0}},
+	{`[[0], b""]`, [][]byte{{0}, {0}}},
+	{"int16 0", int16(0)},
+	{"byte 0", byte(0)},
+}
+
+func TestParseVariant(t *testing.T) {
+	for i, v := range variantParseTests {
+		nv, err := ParseVariant(v.s, Signature{})
+		if err != nil {
+			t.Errorf("test %d: parsing failed: %s", i+1, err)
+			continue
+		}
+		if !reflect.DeepEqual(nv.value, v.v) {
+			t.Errorf("test %d: got %q, wanted %q", i+1, nv, v.v)
+		}
+	}
+}