106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"context"
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"fmt"
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"github.com/docker/docker/api/types/container"
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"github.com/docker/docker/errdefs"
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"github.com/pkg/errors"
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)
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// ContainerUpdate updates configuration of the container
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func (daemon *Daemon) ContainerUpdate(name string, hostConfig *container.HostConfig) (container.ContainerUpdateOKBody, error) {
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var warnings []string
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daemonCfg := daemon.config()
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warnings, err := daemon.verifyContainerSettings(daemonCfg, hostConfig, nil, true)
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if err != nil {
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return container.ContainerUpdateOKBody{Warnings: warnings}, errdefs.InvalidParameter(err)
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}
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if err := daemon.update(name, hostConfig); err != nil {
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return container.ContainerUpdateOKBody{Warnings: warnings}, err
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}
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return container.ContainerUpdateOKBody{Warnings: warnings}, nil
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}
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func (daemon *Daemon) update(name string, hostConfig *container.HostConfig) error {
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if hostConfig == nil {
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return nil
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}
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ctr, err := daemon.GetContainer(name)
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if err != nil {
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return err
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}
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restoreConfig := false
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backupHostConfig := *ctr.HostConfig
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defer func() {
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if restoreConfig {
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ctr.Lock()
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if !ctr.RemovalInProgress && !ctr.Dead {
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ctr.HostConfig = &backupHostConfig
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ctr.CheckpointTo(daemon.containersReplica)
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}
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ctr.Unlock()
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}
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}()
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ctr.Lock()
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if ctr.RemovalInProgress || ctr.Dead {
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ctr.Unlock()
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return errCannotUpdate(ctr.ID, fmt.Errorf(`container is marked for removal and cannot be "update"`))
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}
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if err := ctr.UpdateContainer(hostConfig); err != nil {
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restoreConfig = true
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ctr.Unlock()
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return errCannotUpdate(ctr.ID, err)
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}
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if err := ctr.CheckpointTo(daemon.containersReplica); err != nil {
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restoreConfig = true
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ctr.Unlock()
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return errCannotUpdate(ctr.ID, err)
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}
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ctr.Unlock()
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// if Restart Policy changed, we need to update container monitor
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if hostConfig.RestartPolicy.Name != "" {
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ctr.UpdateMonitor(hostConfig.RestartPolicy)
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}
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defer daemon.LogContainerEvent(ctr, "update")
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// If container is not running, update hostConfig struct is enough,
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// resources will be updated when the container is started again.
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// If container is running (including paused), we need to update configs
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// to the real world.
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ctr.Lock()
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isRestarting := ctr.Restarting
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tsk, err := ctr.GetRunningTask()
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ctr.Unlock()
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if errdefs.IsConflict(err) || isRestarting {
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return nil
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}
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if err != nil {
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return err
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}
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if err := tsk.UpdateResources(context.TODO(), toContainerdResources(hostConfig.Resources)); err != nil {
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restoreConfig = true
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// TODO: it would be nice if containerd responded with better errors here so we can classify this better.
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return errCannotUpdate(ctr.ID, errdefs.System(err))
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}
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return nil
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}
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func errCannotUpdate(containerID string, err error) error {
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return errors.Wrap(err, "Cannot update container "+containerID)
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}
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