Add runsc checkpoint command.

Checkpoint command is plumbed through container and sandbox.
Restore has also been added but it is only a stub. None of this
works yet. More changes to come.

PiperOrigin-RevId: 199510105
Change-Id: Ibd08d57f4737847eb25ca20b114518e487320185

1 files changed, 70 insertions, 0 deletions

diff --git a/runsc/cmd/checkpoint.go b/runsc/cmd/checkpoint.go
new file mode 100644
index 000000000..9b045da1c
--- /dev/null
+++ b/runsc/cmd/checkpoint.go
@@ -0,0 +1,70 @@
+// Copyright 2018 Google Inc.
+//
+// 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"
+	"flag"
+	"github.com/google/subcommands"
+	"gvisor.googlesource.com/gvisor/runsc/boot"
+	"gvisor.googlesource.com/gvisor/runsc/container"
+)
+
+// Checkpoint implements subcommands.Command for the "checkpoint" command.
+type Checkpoint struct {
+}
+
+// Name implements subcommands.Command.Name.
+func (*Checkpoint) Name() string {
+	return "checkpoint"
+}
+
+// Synopsis implements subcommands.Command.Synopsis.
+func (*Checkpoint) Synopsis() string {
+	return "checkpoint current state of container"
+}
+
+// Usage implements subcommands.Command.Usage.
+func (*Checkpoint) Usage() string {
+	return `checkpoint [flags] <container id> - save current state of container.
+`
+}
+
+// SetFlags implements subcommands.Command.SetFlags.
+func (c *Checkpoint) SetFlags(f *flag.FlagSet) {
+}
+
+// Execute implements subcommands.Command.Execute.
+func (c *Checkpoint) 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)
+
+	cont, err := container.Load(conf.RootDir, id)
+	if err != nil {
+		Fatalf("error loading container: %v", err)
+	}
+
+	if err := cont.Checkpoint(); err != nil {
+		Fatalf("checkpoint failed: %v", err)
+	}
+
+	return subcommands.ExitSuccess
+}