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// +build linux
package main
import (
"fmt"
"os"
"github.com/opencontainers/runc/libcontainer"
"github.com/urfave/cli"
)
var restoreCommand = cli.Command{
Name: "restore",
Usage: "restore a container from a previous checkpoint",
ArgsUsage: `<container-id>
Where "<container-id>" is the name for the instance of the container to be
restored.`,
Description: `Restores the saved state of the container instance that was previously saved
using the runc checkpoint command.`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "console-socket",
Value: "",
Usage: "path to an AF_UNIX socket which will receive a file descriptor referencing the master end of the console's pseudoterminal",
},
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: "bundle, b",
Value: "",
Usage: "path to the root of the bundle directory",
},
cli.BoolFlag{
Name: "detach,d",
Usage: "detach from the container's process",
},
cli.StringFlag{
Name: "pid-file",
Value: "",
Usage: "specify the file to write the process id to",
},
cli.BoolFlag{
Name: "no-subreaper",
Usage: "disable the use of the subreaper used to reap reparented processes",
},
cli.BoolFlag{
Name: "no-pivot",
Usage: "do not use pivot root to jail process inside rootfs. This should be used whenever the rootfs is on top of a ramdisk",
},
cli.StringSliceFlag{
Name: "empty-ns",
Usage: "create a namespace, but don't restore its properties",
},
cli.BoolFlag{
Name: "auto-dedup",
Usage: "enable auto deduplication of memory images",
},
cli.BoolFlag{
Name: "lazy-pages",
Usage: "use userfaultfd to lazily restore memory pages",
},
},
Action: func(context *cli.Context) error {
if err := checkArgs(context, 1, exactArgs); err != nil {
return err
}
// XXX: Currently this is untested with rootless containers.
rootless, err := isRootless(context)
if err != nil {
return err
}
if rootless {
return fmt.Errorf("runc restore requires root")
}
spec, err := setupSpec(context)
if err != nil {
return err
}
options := criuOptions(context)
status, err := startContainer(context, spec, CT_ACT_RESTORE, options)
if err != nil {
return err
}
// exit with the container's exit status so any external supervisor is
// notified of the exit with the correct exit status.
os.Exit(status)
return nil
},
}
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"),
ParentImage: context.String("parent-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"),
PreDump: context.Bool("pre-dump"),
AutoDedup: context.Bool("auto-dedup"),
LazyPages: context.Bool("lazy-pages"),
StatusFd: context.String("status-fd"),
}
}