// 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" "fmt" "flag" "github.com/google/subcommands" "gvisor.dev/gvisor/pkg/sentry/control" "gvisor.dev/gvisor/runsc/boot" "gvisor.dev/gvisor/runsc/container" ) // 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) c, err := container.Load(conf.RootDir, id) if err != nil { Fatalf("loading sandbox: %v", err) } pList, err := c.Processes() if err != nil { Fatalf("getting processes for container: %v", err) } switch ps.format { case "table": fmt.Println(control.ProcessListToTable(pList)) case "json": o, err := control.PrintPIDsJSON(pList) if err != nil { Fatalf("generating JSON: %v", err) } fmt.Println(o) default: Fatalf("unsupported format: %s", ps.format) } return subcommands.ExitSuccess }