package daemon import ( "os/exec" "strconv" "strings" "github.com/docker/docker/engine" ) func (daemon *Daemon) ContainerTop(job *engine.Job) engine.Status { if len(job.Args) != 1 && len(job.Args) != 2 { return job.Errorf("Not enough arguments. Usage: %s CONTAINER [PS_ARGS]\n", job.Name) } var ( name = job.Args[0] psArgs = "-ef" ) if len(job.Args) == 2 && job.Args[1] != "" { psArgs = job.Args[1] } container, err := daemon.Get(name) if err != nil { return job.Error(err) } if !container.IsRunning() { return job.Errorf("Container %s is not running", name) } pids, err := daemon.ExecutionDriver().GetPidsForContainer(container.ID) if err != nil { return job.Error(err) } output, err := exec.Command("ps", strings.Split(psArgs, " ")...).Output() if err != nil { return job.Errorf("Error running ps: %s", err) } lines := strings.Split(string(output), "\n") header := strings.Fields(lines[0]) out := &engine.Env{} out.SetList("Titles", header) pidIndex := -1 for i, name := range header { if name == "PID" { pidIndex = i } } if pidIndex == -1 { return job.Errorf("Couldn't find PID field in ps output") } processes := [][]string{} for _, line := range lines[1:] { if len(line) == 0 { continue } fields := strings.Fields(line) p, err := strconv.Atoi(fields[pidIndex]) if err != nil { return job.Errorf("Unexpected pid '%s': %s", fields[pidIndex], err) } for _, pid := range pids { if pid == p { // Make sure number of fields equals number of header titles // merging "overhanging" fields process := fields[:len(header)-1] process = append(process, strings.Join(fields[len(header)-1:], " ")) processes = append(processes, process) } } } out.SetJson("Processes", processes) out.WriteTo(job.Stdout) return engine.StatusOK }