package daemon import ( "fmt" "os/exec" "strconv" "strings" "github.com/docker/docker/api/types" ) func (daemon *Daemon) ContainerTop(name string, psArgs string) (*types.ContainerProcessList, error) { if psArgs == "" { psArgs = "-ef" } container, err := daemon.Get(name) if err != nil { return nil, err } if !container.IsRunning() { return nil, fmt.Errorf("Container %s is not running", name) } pids, err := daemon.ExecutionDriver().GetPidsForContainer(container.ID) if err != nil { return nil, err } output, err := exec.Command("ps", strings.Split(psArgs, " ")...).Output() if err != nil { return nil, fmt.Errorf("Error running ps: %s", err) } procList := &types.ContainerProcessList{} lines := strings.Split(string(output), "\n") procList.Titles = strings.Fields(lines[0]) pidIndex := -1 for i, name := range procList.Titles { if name == "PID" { pidIndex = i } } if pidIndex == -1 { return nil, fmt.Errorf("Couldn't find PID field in ps output") } for _, line := range lines[1:] { if len(line) == 0 { continue } fields := strings.Fields(line) p, err := strconv.Atoi(fields[pidIndex]) if err != nil { return nil, fmt.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(procList.Titles)-1] process = append(process, strings.Join(fields[len(procList.Titles)-1:], " ")) procList.Processes = append(procList.Processes, process) } } } container.LogEvent("top") return procList, nil }