| package daemon // import "github.com/docker/docker/daemon" |
| |
| import ( |
| "context" |
| "fmt" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| |
| "github.com/docker/docker/api/types" |
| "github.com/docker/docker/daemon/names" |
| ) |
| |
| var ( |
| validCheckpointNameChars = names.RestrictedNameChars |
| validCheckpointNamePattern = names.RestrictedNamePattern |
| ) |
| |
| // getCheckpointDir verifies checkpoint directory for create,remove, list options and checks if checkpoint already exists |
| func getCheckpointDir(checkDir, checkpointID, ctrName, ctrID, ctrCheckpointDir string, create bool) (string, error) { |
| var checkpointDir string |
| var err2 error |
| if checkDir != "" { |
| checkpointDir = checkDir |
| } else { |
| checkpointDir = ctrCheckpointDir |
| } |
| checkpointAbsDir := filepath.Join(checkpointDir, checkpointID) |
| stat, err := os.Stat(checkpointAbsDir) |
| if create { |
| switch { |
| case err == nil && stat.IsDir(): |
| err2 = fmt.Errorf("checkpoint with name %s already exists for container %s", checkpointID, ctrName) |
| case err != nil && os.IsNotExist(err): |
| err2 = os.MkdirAll(checkpointAbsDir, 0700) |
| case err != nil: |
| err2 = err |
| default: |
| err2 = fmt.Errorf("%s exists and is not a directory", checkpointAbsDir) |
| } |
| } else { |
| switch { |
| case err != nil: |
| err2 = fmt.Errorf("checkpoint %s does not exist for container %s", checkpointID, ctrName) |
| case stat.IsDir(): |
| err2 = nil |
| default: |
| err2 = fmt.Errorf("%s exists and is not a directory", checkpointAbsDir) |
| } |
| } |
| return checkpointAbsDir, err2 |
| } |
| |
| // CheckpointCreate checkpoints the process running in a container with CRIU |
| func (daemon *Daemon) CheckpointCreate(name string, config types.CheckpointCreateOptions) error { |
| container, err := daemon.GetContainer(name) |
| if err != nil { |
| return err |
| } |
| |
| if !container.IsRunning() { |
| return fmt.Errorf("Container %s not running", name) |
| } |
| |
| if !validCheckpointNamePattern.MatchString(config.CheckpointID) { |
| return fmt.Errorf("Invalid checkpoint ID (%s), only %s are allowed", config.CheckpointID, validCheckpointNameChars) |
| } |
| |
| checkpointDir, err := getCheckpointDir(config.CheckpointDir, config.CheckpointID, name, container.ID, container.CheckpointDir(), true) |
| if err != nil { |
| return fmt.Errorf("cannot checkpoint container %s: %s", name, err) |
| } |
| |
| err = daemon.containerd.CreateCheckpoint(context.Background(), container.ID, checkpointDir, config.Exit) |
| if err != nil { |
| os.RemoveAll(checkpointDir) |
| return fmt.Errorf("Cannot checkpoint container %s: %s", name, err) |
| } |
| |
| daemon.LogContainerEvent(container, "checkpoint") |
| |
| return nil |
| } |
| |
| // CheckpointDelete deletes the specified checkpoint |
| func (daemon *Daemon) CheckpointDelete(name string, config types.CheckpointDeleteOptions) error { |
| container, err := daemon.GetContainer(name) |
| if err != nil { |
| return err |
| } |
| checkpointDir, err := getCheckpointDir(config.CheckpointDir, config.CheckpointID, name, container.ID, container.CheckpointDir(), false) |
| if err == nil { |
| return os.RemoveAll(checkpointDir) |
| } |
| return err |
| } |
| |
| // CheckpointList lists all checkpoints of the specified container |
| func (daemon *Daemon) CheckpointList(name string, config types.CheckpointListOptions) ([]types.Checkpoint, error) { |
| var out []types.Checkpoint |
| |
| container, err := daemon.GetContainer(name) |
| if err != nil { |
| return nil, err |
| } |
| |
| checkpointDir, err := getCheckpointDir(config.CheckpointDir, "", name, container.ID, container.CheckpointDir(), false) |
| if err != nil { |
| return nil, err |
| } |
| |
| if err := os.MkdirAll(checkpointDir, 0755); err != nil { |
| return nil, err |
| } |
| |
| dirs, err := ioutil.ReadDir(checkpointDir) |
| if err != nil { |
| return nil, err |
| } |
| |
| for _, d := range dirs { |
| if !d.IsDir() { |
| continue |
| } |
| cpt := types.Checkpoint{Name: d.Name()} |
| out = append(out, cpt) |
| } |
| |
| return out, nil |
| } |