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// Copyright 2018 Google LLC
//
// 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
}
// 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")
// Unimplemented flags necessary for compatibility with docker.
var d bool
f.BoolVar(&d, "detach", false, "ignored")
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("error reading spec: %v", err)
}
specutils.LogSpec(spec)
if r.imagePath == "" {
Fatalf("image-path flag must be provided")
}
restoreFile := filepath.Join(r.imagePath, checkpointFileName)
c, err := container.Load(conf.RootDir, id)
if err != nil {
Fatalf("error loading container: %v", err)
}
if err := c.Restore(spec, conf, restoreFile); err != nil {
Fatalf("error restoring container: %v", err)
}
ws, err := c.Wait()
if err != nil {
Fatalf("error running container: %v", err)
}
*waitStatus = ws
return subcommands.ExitSuccess
}
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