Initial commit

vendor/github.com/hyperhq/hypercli/daemon/export.go

@@ -0,0 +1,55 @@
+package daemon
+
+import (
+	"io"
+
+	"github.com/hyperhq/hypercli/container"
+	derr "github.com/hyperhq/hypercli/errors"
+	"github.com/hyperhq/hypercli/pkg/archive"
+	"github.com/hyperhq/hypercli/pkg/ioutils"
+)
+
+// ContainerExport writes the contents of the container to the given
+// writer. An error is returned if the container cannot be found.
+func (daemon *Daemon) ContainerExport(name string, out io.Writer) error {
+	container, err := daemon.GetContainer(name)
+	if err != nil {
+		return err
+	}
+
+	data, err := daemon.containerExport(container)
+	if err != nil {
+		return derr.ErrorCodeExportFailed.WithArgs(name, err)
+	}
+	defer data.Close()
+
+	// Stream the entire contents of the container (basically a volatile snapshot)
+	if _, err := io.Copy(out, data); err != nil {
+		return derr.ErrorCodeExportFailed.WithArgs(name, err)
+	}
+	return nil
+}
+
+func (daemon *Daemon) containerExport(container *container.Container) (archive.Archive, error) {
+	if err := daemon.Mount(container); err != nil {
+		return nil, err
+	}
+
+	uidMaps, gidMaps := daemon.GetUIDGIDMaps()
+	archive, err := archive.TarWithOptions(container.BaseFS, &archive.TarOptions{
+		Compression: archive.Uncompressed,
+		UIDMaps:     uidMaps,
+		GIDMaps:     gidMaps,
+	})
+	if err != nil {
+		daemon.Unmount(container)
+		return nil, err
+	}
+	arch := ioutils.NewReadCloserWrapper(archive, func() error {
+		err := archive.Close()
+		daemon.Unmount(container)
+		return err
+	})
+	daemon.LogContainerEvent(container, "export")
+	return arch, err
+}