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moby--moby/daemon/update.go
Fabio Kung aacddda89d Move checkpointing to the Container object
Also hide ViewDB behind an inteface.

Signed-off-by: Fabio Kung <fabio.kung@gmail.com>
2017-06-23 07:52:32 -07:00

86 lines
2.4 KiB
Go

package daemon
import (
"fmt"
"github.com/docker/docker/api/types/container"
)
// ContainerUpdate updates configuration of the container
func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) (container.ContainerUpdateOKBody, error) {
var warnings []string
warnings, err := daemon.verifyContainerSettings(hostConfig, nil, true)
if err != nil {
return container.ContainerUpdateOKBody{Warnings: warnings}, err
}
if err := daemon.update(name, hostConfig); err != nil {
return container.ContainerUpdateOKBody{Warnings: warnings}, err
}
return container.ContainerUpdateOKBody{Warnings: warnings}, 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
}
restoreConfig := false
backupHostConfig := *container.HostConfig
defer func() {
if restoreConfig {
container.Lock()
container.HostConfig = &backupHostConfig
container.CheckpointAndSaveToDisk(daemon.containersReplica)
container.Unlock()
}
}()
if container.RemovalInProgress || container.Dead {
return errCannotUpdate(container.ID, fmt.Errorf("Container is marked for removal and cannot be \"update\"."))
}
container.Lock()
if err := container.UpdateContainer(hostConfig); err != nil {
restoreConfig = true
container.Unlock()
return errCannotUpdate(container.ID, err)
}
if err := container.CheckpointTo(daemon.containersReplica); err != nil {
restoreConfig = true
container.Unlock()
return errCannotUpdate(container.ID, err)
}
container.Unlock()
// if Restart Policy changed, we need to update container monitor
if hostConfig.RestartPolicy.Name != "" {
container.UpdateMonitor(hostConfig.RestartPolicy)
}
// 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() && !container.IsRestarting() {
if err := daemon.containerd.UpdateResources(container.ID, toContainerdResources(hostConfig.Resources)); err != nil {
restoreConfig = true
return errCannotUpdate(container.ID, err)
}
}
daemon.LogContainerEvent(container, "update")
return nil
}
func errCannotUpdate(containerID string, err error) error {
return fmt.Errorf("Cannot update container %s: %v", containerID, err)
}