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restore.go
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restore.go
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// +build linux
package main
import (
"fmt"
"os"
"path/filepath"
"github.com/Sirupsen/logrus"
"github.com/codegangsta/cli"
"github.com/opencontainers/runc/libcontainer"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/specs"
)
var restoreCommand = cli.Command{
Name: "restore",
Usage: "restore a container from a previous checkpoint",
Flags: []cli.Flag{
cli.StringFlag{
Name: "image-path",
Value: "",
Usage: "path to criu image files for restoring",
},
cli.StringFlag{
Name: "work-path",
Value: "",
Usage: "path for saving work files and logs",
},
cli.BoolFlag{
Name: "tcp-established",
Usage: "allow open tcp connections",
},
cli.BoolFlag{
Name: "ext-unix-sk",
Usage: "allow external unix sockets",
},
cli.BoolFlag{
Name: "shell-job",
Usage: "allow shell jobs",
},
cli.BoolFlag{
Name: "file-locks",
Usage: "handle file locks, for safety",
},
cli.StringFlag{
Name: "manage-cgroups-mode",
Value: "",
Usage: "cgroups mode: 'soft' (default), 'full' and 'strict'.",
},
cli.StringFlag{
Name: "config-file, c",
Value: "config.json",
Usage: "path to spec file for writing",
},
cli.StringFlag{
Name: "runtime-file, r",
Value: "runtime.json",
Usage: "path for runtime file for writing",
},
},
Action: func(context *cli.Context) {
imagePath := context.String("image-path")
if imagePath == "" {
imagePath = getDefaultImagePath(context)
}
spec, rspec, err := loadSpec(context.String("config-file"), context.String("runtime-file"))
if err != nil {
fatal(err)
}
config, err := createLibcontainerConfig(context.GlobalString("id"), spec, rspec)
if err != nil {
fatal(err)
}
status, err := restoreContainer(context, spec, config, imagePath)
if err != nil {
fatal(err)
}
os.Exit(status)
},
}
func restoreContainer(context *cli.Context, spec *specs.LinuxSpec, config *configs.Config, imagePath string) (code int, err error) {
rootuid := 0
factory, err := loadFactory(context)
if err != nil {
return -1, err
}
container, err := factory.Load(context.GlobalString("id"))
if err != nil {
container, err = factory.Create(context.GlobalString("id"), config)
if err != nil {
return -1, err
}
}
options := criuOptions(context)
status, err := container.Status()
if err != nil {
logrus.Error(err)
}
if status == libcontainer.Running {
fatal(fmt.Errorf("Container with id %s already running", context.GlobalString("id")))
}
setManageCgroupsMode(context, options)
// ensure that the container is always removed if we were the process
// that created it.
defer func() {
if err != nil {
return
}
status, err := container.Status()
if err != nil {
logrus.Error(err)
}
if status != libcontainer.Checkpointed {
if err := container.Destroy(); err != nil {
logrus.Error(err)
}
if err := os.RemoveAll(options.ImagesDirectory); err != nil {
logrus.Error(err)
}
}
}()
process := &libcontainer.Process{
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
}
tty, err := newTty(spec.Process.Terminal, process, rootuid)
if err != nil {
return -1, err
}
handler := newSignalHandler(tty)
defer handler.Close()
if err := container.Restore(process, options); err != nil {
cstatus, cerr := container.Status()
if cerr != nil {
logrus.Error(cerr)
}
if cstatus == libcontainer.Destroyed {
dest := filepath.Join(context.GlobalString("root"), context.GlobalString("id"))
if errVal := os.RemoveAll(dest); errVal != nil {
logrus.Error(errVal)
}
}
return -1, err
}
return handler.forward(process)
}
func criuOptions(context *cli.Context) *libcontainer.CriuOpts {
imagePath := getCheckpointImagePath(context)
if err := os.MkdirAll(imagePath, 0655); err != nil {
fatal(err)
}
return &libcontainer.CriuOpts{
ImagesDirectory: imagePath,
WorkDirectory: context.String("work-path"),
LeaveRunning: context.Bool("leave-running"),
TcpEstablished: context.Bool("tcp-established"),
ExternalUnixConnections: context.Bool("ext-unix-sk"),
ShellJob: context.Bool("shell-job"),
FileLocks: context.Bool("file-locks"),
}
}