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moby--moby/daemon/checkpoint.go
boucher bd7d51292c Allow providing a custom storage directory for docker checkpoints
Signed-off-by: boucher <rboucher@gmail.com>
2016-10-28 07:56:05 -04:00

100 lines
2.3 KiB
Go

package daemon
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/docker/docker/api/types"
)
// 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)
}
var checkpointDir string
if config.CheckpointDir != "" {
checkpointDir = config.CheckpointDir
} else {
checkpointDir = container.CheckpointDir()
}
err = daemon.containerd.CreateCheckpoint(container.ID, config.CheckpointID, checkpointDir, config.Exit)
if err != nil {
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
}
var checkpointDir string
if config.CheckpointDir != "" {
checkpointDir = config.CheckpointDir
} else {
checkpointDir = container.CheckpointDir()
}
return os.RemoveAll(filepath.Join(checkpointDir, config.CheckpointID))
}
// 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
}
var checkpointDir string
if config.CheckpointDir != "" {
checkpointDir = config.CheckpointDir
} else {
checkpointDir = container.CheckpointDir()
}
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
}