1 files changed, 106 insertions, 0 deletions
diff --git a/runsc/cmd/restore.go b/runsc/cmd/restore.go
new file mode 100644
index 000000000..3ab2f5676
--- /dev/null
+++ b/runsc/cmd/restore.go
@@ -0,0 +1,106 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmd
+
+import (
+	"context"
+	"path/filepath"
+	"syscall"
+
+	"flag"
+	"github.com/google/subcommands"
+	"gvisor.googlesource.com/gvisor/runsc/boot"
+	"gvisor.googlesource.com/gvisor/runsc/container"
+	"gvisor.googlesource.com/gvisor/runsc/specutils"
+)
+
+// Restore implements subcommands.Command for the "restore" command.
+type Restore struct {
+	// Restore flags are a super-set of those for Create.
+	Create
+
+	// imagePath is the path to the saved container image
+	imagePath string
+
+	// detach indicates that runsc has to start a process and exit without waiting it.
+	detach bool
+}
+
+// Name implements subcommands.Command.Name.
+func (*Restore) Name() string {
+	return "restore"
+}
+
+// Synopsis implements subcommands.Command.Synopsis.
+func (*Restore) Synopsis() string {
+	return "restore a saved state of container (experimental)"
+}
+
+// Usage implements subcommands.Command.Usage.
+func (*Restore) Usage() string {
+	return `restore [flags] <container id> - restore saved state of container.
+`
+}
+
+// SetFlags implements subcommands.Command.SetFlags.
+func (r *Restore) SetFlags(f *flag.FlagSet) {
+	r.Create.SetFlags(f)
+	f.StringVar(&r.imagePath, "image-path", "", "directory path to saved container image")
+	f.BoolVar(&r.detach, "detach", false, "detach from the container's process")
+
+	// Unimplemented flags necessary for compatibility with docker.
+
+	var nsr bool
+	f.BoolVar(&nsr, "no-subreaper", false, "ignored")
+
+	var wp string
+	f.StringVar(&wp, "work-path", "", "ignored")
+}
+
+// Execute implements subcommands.Command.Execute.
+func (r *Restore) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
+	if f.NArg() != 1 {
+		f.Usage()
+		return subcommands.ExitUsageError
+	}
+
+	id := f.Arg(0)
+	conf := args[0].(*boot.Config)
+	waitStatus := args[1].(*syscall.WaitStatus)
+
+	bundleDir := r.bundleDir
+	if bundleDir == "" {
+		bundleDir = getwdOrDie()
+	}
+	spec, err := specutils.ReadSpec(bundleDir)
+	if err != nil {
+		Fatalf("reading spec: %v", err)
+	}
+	specutils.LogSpec(spec)
+
+	if r.imagePath == "" {
+		Fatalf("image-path flag must be provided")
+	}
+
+	conf.RestoreFile = filepath.Join(r.imagePath, checkpointFileName)
+
+	ws, err := container.Run(id, spec, conf, bundleDir, r.consoleSocket, r.pidFile, r.userLog, r.detach)
+	if err != nil {
+		Fatalf("running container: %v", err)
+	}
+	*waitStatus = ws
+
+	return subcommands.ExitSuccess
+}