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package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"fmt"
"os"
"path/filepath"
"github.com/docker/docker/api/types/checkpoint"
"github.com/docker/docker/api/types/events"
"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, 0o700)
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 checkpoint.CreateOptions) error {
container, err := daemon.GetContainer(name)
if err != nil {
return err
}
container.Lock()
tsk, err := container.GetRunningTask()
container.Unlock()
if err != nil {
return err
}
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 = tsk.CreateCheckpoint(context.Background(), checkpointDir, config.Exit)
if err != nil {
os.RemoveAll(checkpointDir)
return fmt.Errorf("Cannot checkpoint container %s: %s", name, err)
}
daemon.LogContainerEvent(container, events.ActionCheckpoint)
return nil
}
// CheckpointDelete deletes the specified checkpoint
func (daemon *Daemon) CheckpointDelete(name string, config checkpoint.DeleteOptions) 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 checkpoint.ListOptions) ([]checkpoint.Summary, error) {
var out []checkpoint.Summary
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, 0o755); err != nil {
return nil, err
}
dirs, err := os.ReadDir(checkpointDir)
if err != nil {
return nil, err
}
for _, d := range dirs {
if !d.IsDir() {
continue
}
cpt := checkpoint.Summary{Name: d.Name()}
out = append(out, cpt)
}
return out, nil
}
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