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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"
"fmt"
"os"
"text/tabwriter"
"time"
"flag"
"github.com/google/subcommands"
specs "github.com/opencontainers/runtime-spec/specs-go"
"gvisor.googlesource.com/gvisor/runsc/boot"
"gvisor.googlesource.com/gvisor/runsc/container"
)
// List implements subcommands.Command for the "list" command for the "list" command.
type List struct {
quiet bool
format string
}
// Name implements subcommands.command.name.
func (*List) Name() string {
return "list"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*List) Synopsis() string {
return "list containers started by runsc with the given root"
}
// Usage implements subcommands.Command.Usage.
func (*List) Usage() string {
return `list [flags]`
}
// SetFlags implements subcommands.Command.SetFlags.
func (l *List) SetFlags(f *flag.FlagSet) {
f.BoolVar(&l.quiet, "quiet", false, "only list container ids")
f.StringVar(&l.format, "format", "text", "output format: 'text' (default) or 'json'")
}
// Execute implements subcommands.Command.Execute.
func (l *List) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
if f.NArg() != 0 {
f.Usage()
return subcommands.ExitUsageError
}
conf := args[0].(*boot.Config)
ids, err := container.List(conf.RootDir)
if err != nil {
Fatalf("%v", err)
}
if l.quiet {
for _, id := range ids {
fmt.Println(id)
}
return subcommands.ExitSuccess
}
// Collect the containers.
var containers []*container.Container
for _, id := range ids {
c, err := container.Load(conf.RootDir, id)
if err != nil {
Fatalf("loading container %q: %v", id, err)
}
containers = append(containers, c)
}
switch l.format {
case "text":
// Print a nice table.
w := tabwriter.NewWriter(os.Stdout, 12, 1, 3, ' ', 0)
fmt.Fprint(w, "ID\tPID\tSTATUS\tBUNDLE\tCREATED\tOWNER\n")
for _, c := range containers {
fmt.Fprintf(w, "%s\t%d\t%s\t%s\t%s\t%s\n",
c.ID,
c.SandboxPid(),
c.Status,
c.BundleDir,
c.CreatedAt.Format(time.RFC3339Nano),
c.Owner)
}
w.Flush()
case "json":
// Print just the states.
var states []specs.State
for _, c := range containers {
states = append(states, c.State())
}
if err := json.NewEncoder(os.Stdout).Encode(states); err != nil {
Fatalf("marshaling container state: %v", err)
}
default:
Fatalf("unknown list format %q", l.format)
}
return subcommands.ExitSuccess
}
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