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

3 files changed, 123 insertions, 0 deletions

diff --git a/runsc/cmd/BUILD b/runsc/cmd/BUILD
index 4b4afa4a0..a8c84a6a3 100644
--- a/runsc/cmd/BUILD
+++ b/runsc/cmd/BUILD
@@ -6,6 +6,7 @@ go_library(
     name = "cmd",
     srcs = [
         "boot.go",
+        "checkpoint.go",
         "cmd.go",
         "create.go",
         "delete.go",
@@ -16,6 +17,7 @@ go_library(
         "list.go",
         "path.go",
         "ps.go",
+        "restore.go",
         "run.go",
         "start.go",
         "state.go",
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
+}
diff --git a/runsc/cmd/restore.go b/runsc/cmd/restore.go
new file mode 100644
index 000000000..a535197a4
--- /dev/null
+++ b/runsc/cmd/restore.go
@@ -0,0 +1,51 @@
+// 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"
+)
+
+// Restore implements subcommands.Command for the "restore" command.
+type Restore struct {
+}
+
+// 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"
+}
+
+// Usage implements subcommands.Command.Usage.
+func (*Restore) Usage() string {
+	return `restore [flags] <container id> - restore last saved state of container.
+`
+}
+
+// SetFlags implements subcommands.Command.SetFlags.
+func (r *Restore) SetFlags(f *flag.FlagSet) {
+}
+
+// Execute implements subcommands.Command.Execute.
+func (r *Restore) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
+	Fatalf("restore not implemented")
+	return subcommands.ExitFailure
+}