95 lines
2.8 KiB
Go
95 lines
2.8 KiB
Go
package 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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c, err := daemon.GetContainer(name)
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if err != nil {
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return container.ContainerUpdateOKBody{Warnings: warnings}, err
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}
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warnings, err = daemon.verifyContainerSettings(c.OS, 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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container, 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 := *container.HostConfig
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defer func() {
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if restoreConfig {
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container.Lock()
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container.HostConfig = &backupHostConfig
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container.CheckpointTo(daemon.containersReplica)
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container.Unlock()
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}
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}()
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if container.RemovalInProgress || container.Dead {
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return errCannotUpdate(container.ID, fmt.Errorf("container is marked for removal and cannot be \"update\""))
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}
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container.Lock()
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if err := container.UpdateContainer(hostConfig); err != nil {
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restoreConfig = true
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container.Unlock()
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return errCannotUpdate(container.ID, err)
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}
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if err := container.CheckpointTo(daemon.containersReplica); err != nil {
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restoreConfig = true
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container.Unlock()
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return errCannotUpdate(container.ID, err)
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}
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container.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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container.UpdateMonitor(hostConfig.RestartPolicy)
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}
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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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if container.IsRunning() && !container.IsRestarting() {
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if err := daemon.containerd.UpdateResources(context.Background(), container.ID, 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(container.ID, errdefs.System(err))
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}
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}
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daemon.LogContainerEvent(container, "update")
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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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