package main import ( "fmt" "os" "strings" "text/tabwriter" "github.com/containers/libpod/cmd/podman/cliconfig" "github.com/containers/libpod/cmd/podman/libpodruntime" "github.com/containers/libpod/libpod" "github.com/containers/libpod/pkg/rootless" "github.com/pkg/errors" "github.com/spf13/cobra" ) func getDescriptorString() string { descriptors, err := libpod.GetContainerPidInformationDescriptors() if err == nil { return fmt.Sprintf(` Format Descriptors: %s`, strings.Join(descriptors, ",")) } return "" } var ( topCommand cliconfig.TopValues topDescription = fmt.Sprintf(`Similar to system "top" command. Specify format descriptors to alter the output. Running "podman top -l pid pcpu seccomp" will print the process ID, the CPU percentage and the seccomp mode of each process of the latest container. %s`, getDescriptorString()) _topCommand = &cobra.Command{ Use: "top [flags] CONTAINER [FORMAT-DESCRIPTORS]", Short: "Display the running processes of a container", Long: topDescription, RunE: func(cmd *cobra.Command, args []string) error { topCommand.InputArgs = args topCommand.GlobalFlags = MainGlobalOpts return topCmd(&topCommand) }, Example: `podman top ctrID podman top --latest podman top ctrID pid seccomp args %C`, } ) func init() { topCommand.Command = _topCommand topCommand.SetHelpTemplate(HelpTemplate()) topCommand.SetUsageTemplate(UsageTemplate()) flags := topCommand.Flags() flags.BoolVar(&topCommand.ListDescriptors, "list-descriptors", false, "") flags.MarkHidden("list-descriptors") flags.BoolVarP(&topCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of") markFlagHiddenForRemoteClient("latest", flags) } func topCmd(c *cliconfig.TopValues) error { var container *libpod.Container var err error args := c.InputArgs if c.ListDescriptors { descriptors, err := libpod.GetContainerPidInformationDescriptors() if err != nil { return err } fmt.Println(strings.Join(descriptors, "\n")) return nil } if len(args) < 1 && !c.Latest { return errors.Errorf("you must provide the name or id of a running container") } rootless.SetSkipStorageSetup(true) runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand) if err != nil { return errors.Wrapf(err, "error creating libpod runtime") } defer runtime.Shutdown(false) var descriptors []string if c.Latest { descriptors = args container, err = runtime.GetLatestContainer() } else { descriptors = args[1:] container, err = runtime.LookupContainer(args[0]) } if err != nil { return errors.Wrapf(err, "unable to lookup requested container") } conStat, err := container.State() if err != nil { return errors.Wrapf(err, "unable to look up state for %s", args[0]) } if conStat != libpod.ContainerStateRunning { return errors.Errorf("top can only be used on running containers") } pid, err := container.PID() if err != nil { return err } became, ret, err := rootless.JoinNS(uint(pid), 0) if err != nil { return err } if became { os.Exit(ret) } psOutput, err := container.GetContainerPidInformation(descriptors) if err != nil { return err } w := tabwriter.NewWriter(os.Stdout, 5, 1, 3, ' ', 0) for _, proc := range psOutput { fmt.Fprintln(w, proc) } w.Flush() return nil }