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