// 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" "encoding/json" "os" "github.com/google/subcommands" "gvisor.dev/gvisor/pkg/log" "gvisor.dev/gvisor/runsc/boot" "gvisor.dev/gvisor/runsc/container" "gvisor.dev/gvisor/runsc/flag" ) // State implements subcommands.Command for the "state" command. type State struct{} // Name implements subcommands.Command.Name. func (*State) Name() string { return "state" } // Synopsis implements subcommands.Command.Synopsis. func (*State) Synopsis() string { return "get the state of a container" } // Usage implements subcommands.Command.Usage. func (*State) Usage() string { return `state [flags] <container id> - get the state of a container` } // SetFlags implements subcommands.Command.SetFlags. func (*State) SetFlags(f *flag.FlagSet) {} // Execute implements subcommands.Command.Execute. func (*State) 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) c, err := container.Load(conf.RootDir, id) if err != nil { Fatalf("loading container: %v", err) } log.Debugf("Returning state for container %+v", c) state := c.State() log.Debugf("State: %+v", state) // Write json-encoded state directly to stdout. b, err := json.MarshalIndent(state, "", " ") if err != nil { Fatalf("marshaling container state: %v", err) } os.Stdout.Write(b) return subcommands.ExitSuccess }