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moby--moby/daemon/checkpoint.go

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package daemon
import (
"context"
"encoding/json"
"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 = filepath.Join(checkDir, ctrID, "checkpoints")
} 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)
if os.IsExist(err2) {
err2 = nil
}
case err != nil:
err2 = err
case err == nil:
err2 = fmt.Errorf("%s exists and is not a directory", checkpointAbsDir)
}
} else {
switch {
case err != nil:
err2 = fmt.Errorf("checkpoint %s does not exists for container %s", checkpointID, ctrName)
case err == nil && stat.IsDir():
err2 = nil
case err == nil:
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 container.Config.Tty {
return fmt.Errorf("checkpoint not support on containers with tty")
}
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(filepath.Join(checkpointDir, config.CheckpointID))
}
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
}
path := filepath.Join(checkpointDir, d.Name(), "config.json")
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
var cpt types.Checkpoint
if err := json.Unmarshal(data, &cpt); err != nil {
return nil, err
}
out = append(out, cpt)
}
return out, nil
}