113 lines
2.9 KiB
Go
113 lines
2.9 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cmd
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import (
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"context"
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"path/filepath"
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"syscall"
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"flag"
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"github.com/google/subcommands"
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"gvisor.googlesource.com/gvisor/runsc/boot"
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"gvisor.googlesource.com/gvisor/runsc/container"
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"gvisor.googlesource.com/gvisor/runsc/specutils"
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)
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// Restore implements subcommands.Command for the "restore" command.
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type Restore struct {
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// Restore flags are a super-set of those for Create.
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Create
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// imagePath is the path to the saved container image
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imagePath string
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}
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// Name implements subcommands.Command.Name.
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func (*Restore) Name() string {
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return "restore"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*Restore) Synopsis() string {
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return "restore a saved state of container (experimental)"
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}
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// Usage implements subcommands.Command.Usage.
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func (*Restore) Usage() string {
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return `restore [flags] <container id> - restore saved state of container.
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`
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (r *Restore) SetFlags(f *flag.FlagSet) {
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r.Create.SetFlags(f)
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f.StringVar(&r.imagePath, "image-path", "", "directory path to saved container image")
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// Unimplemented flags necessary for compatibility with docker.
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var d bool
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f.BoolVar(&d, "detach", false, "ignored")
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var nsr bool
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f.BoolVar(&nsr, "no-subreaper", false, "ignored")
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var wp string
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f.StringVar(&wp, "work-path", "", "ignored")
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}
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// Execute implements subcommands.Command.Execute.
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func (r *Restore) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
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if f.NArg() != 1 {
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f.Usage()
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return subcommands.ExitUsageError
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}
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id := f.Arg(0)
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conf := args[0].(*boot.Config)
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waitStatus := args[1].(*syscall.WaitStatus)
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bundleDir := r.bundleDir
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if bundleDir == "" {
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bundleDir = getwdOrDie()
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}
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spec, err := specutils.ReadSpec(bundleDir)
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if err != nil {
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Fatalf("reading spec: %v", err)
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}
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specutils.LogSpec(spec)
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if r.imagePath == "" {
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Fatalf("image-path flag must be provided")
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}
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restoreFile := filepath.Join(r.imagePath, checkpointFileName)
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c, err := container.Load(conf.RootDir, id)
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if err != nil {
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Fatalf("loading container: %v", err)
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}
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if err := c.Restore(spec, conf, restoreFile); err != nil {
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Fatalf("restoring container: %v", err)
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}
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ws, err := c.Wait()
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if err != nil {
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Fatalf("running container: %v", err)
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}
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*waitStatus = ws
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return subcommands.ExitSuccess
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}
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