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// 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
}
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