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// Copyright 2018 Google Inc.
//
// 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"
"fmt"
"flag"
"github.com/google/subcommands"
"gvisor.googlesource.com/gvisor/pkg/sentry/control"
"gvisor.googlesource.com/gvisor/runsc/boot"
"gvisor.googlesource.com/gvisor/runsc/sandbox"
)
// PS implements subcommands.Command for the "ps" command.
type PS struct {
format string
}
// Name implements subcommands.Command.Name.
func (*PS) Name() string {
return "ps"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*PS) Synopsis() string {
return "ps displays the processes running inside a container"
}
// Usage implements subcommands.Command.Usage.
func (*PS) Usage() string {
return "<container-id> [ps options]"
}
// SetFlags implements subcommands.Command.SetFlags.
func (ps *PS) SetFlags(f *flag.FlagSet) {
f.StringVar(&ps.format, "format", "table", "output format. Select one of: table or json (default: table)")
}
// Execute implements subcommands.Command.Execute.
func (ps *PS) Execute(ctx 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)
s, err := sandbox.Load(conf.RootDir, id)
if err != nil {
Fatalf("error loading sandox: %v", err)
}
pList, err := s.Processes()
if err != nil {
Fatalf("error getting processes for sandbox: %v", err)
}
switch ps.format {
case "table":
fmt.Println(control.ProcessListToTable(pList))
case "json":
o, err := control.PrintPIDsJSON(pList)
if err != nil {
Fatalf("error generating JSON: %v", err)
}
fmt.Println(o)
default:
Fatalf("Unsupported format: %s", ps.format)
}
return subcommands.ExitSuccess
}
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