Initial commit

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

@@ -0,0 +1,74 @@
+package daemon
+
+import (
+	"fmt"
+
+	derr "github.com/hyperhq/hypercli/errors"
+	"github.com/docker/engine-api/types/container"
+)
+
+// ContainerUpdate updates resources of the container
+func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) ([]string, error) {
+	var warnings []string
+
+	warnings, err := daemon.verifyContainerSettings(hostConfig, nil)
+	if err != nil {
+		return warnings, err
+	}
+
+	if err := daemon.update(name, hostConfig); err != nil {
+		return warnings, err
+	}
+
+	return warnings, nil
+}
+
+// ContainerUpdateCmdOnBuild updates Path and Args for the container with ID cID.
+func (daemon *Daemon) ContainerUpdateCmdOnBuild(cID string, cmd []string) error {
+	c, err := daemon.GetContainer(cID)
+	if err != nil {
+		return err
+	}
+	c.Path = cmd[0]
+	c.Args = cmd[1:]
+	return nil
+}
+
+func (daemon *Daemon) update(name string, hostConfig *container.HostConfig) error {
+	if hostConfig == nil {
+		return nil
+	}
+
+	container, err := daemon.GetContainer(name)
+	if err != nil {
+		return err
+	}
+
+	if container.RemovalInProgress || container.Dead {
+		errMsg := fmt.Errorf("Container is marked for removal and cannot be \"update\".")
+		return derr.ErrorCodeCantUpdate.WithArgs(container.ID, errMsg)
+	}
+
+	if container.IsRunning() && hostConfig.KernelMemory != 0 {
+		errMsg := fmt.Errorf("Can not update kernel memory to a running container, please stop it first.")
+		return derr.ErrorCodeCantUpdate.WithArgs(container.ID, errMsg)
+	}
+
+	if err := container.UpdateContainer(hostConfig); err != nil {
+		return derr.ErrorCodeCantUpdate.WithArgs(container.ID, err.Error())
+	}
+
+	// If container is not running, update hostConfig struct is enough,
+	// resources will be updated when the container is started again.
+	// If container is running (including paused), we need to update configs
+	// to the real world.
+	if container.IsRunning() {
+		if err := daemon.execDriver.Update(container.Command); err != nil {
+			return derr.ErrorCodeCantUpdate.WithArgs(container.ID, err.Error())
+		}
+	}
+
+	daemon.LogContainerEvent(container, "update")
+
+	return nil
+}