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