github.com/containers/libpod@v1.9.4-0.20220419124438-4284fd425507/cmd/podman/pod_top.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  	"strings"
     7  	"text/tabwriter"
     8  
     9  	"github.com/containers/libpod/cmd/podman/cliconfig"
    10  	"github.com/containers/libpod/pkg/adapter"
    11  	"github.com/containers/libpod/pkg/util"
    12  	"github.com/pkg/errors"
    13  	"github.com/spf13/cobra"
    14  )
    15  
    16  var (
    17  	podTopCommand cliconfig.PodTopValues
    18  
    19  	podTopDescription = fmt.Sprintf(`Specify format descriptors to alter the output.
    20  
    21    You may run "podman pod top -l pid pcpu seccomp" to print the process ID, the CPU percentage and the seccomp mode of each process of the latest pod.
    22  %s`, getDescriptorString())
    23  
    24  	_podTopCommand = &cobra.Command{
    25  		Use:   "top [flags] CONTAINER [FORMAT-DESCRIPTORS]",
    26  		Short: "Display the running processes of containers in a pod",
    27  		Long:  podTopDescription,
    28  		RunE: func(cmd *cobra.Command, args []string) error {
    29  			podTopCommand.InputArgs = args
    30  			podTopCommand.GlobalFlags = MainGlobalOpts
    31  			podTopCommand.Remote = remoteclient
    32  			return podTopCmd(&podTopCommand)
    33  		},
    34  		Example: `podman top ctrID
    35    podman top --latest
    36    podman top --latest pid seccomp args %C`,
    37  	}
    38  )
    39  
    40  func init() {
    41  	podTopCommand.Command = _podTopCommand
    42  	podTopCommand.SetHelpTemplate(HelpTemplate())
    43  	podTopCommand.SetUsageTemplate(UsageTemplate())
    44  	flags := podTopCommand.Flags()
    45  	flags.BoolVarP(&podTopCommand.Latest, "latest", "l", false, "Act on the latest pod podman is aware of")
    46  	flags.BoolVar(&podTopCommand.ListDescriptors, "list-descriptors", false, "")
    47  	markFlagHidden(flags, "list-descriptors")
    48  }
    49  
    50  func podTopCmd(c *cliconfig.PodTopValues) error {
    51  	var (
    52  		descriptors []string
    53  	)
    54  	args := c.InputArgs
    55  
    56  	if c.ListDescriptors {
    57  		descriptors, err := util.GetContainerPidInformationDescriptors()
    58  		if err != nil {
    59  			return err
    60  		}
    61  		fmt.Println(strings.Join(descriptors, "\n"))
    62  		return nil
    63  	}
    64  
    65  	if len(args) < 1 && !c.Latest {
    66  		return errors.Errorf("you must provide the name or id of a running pod")
    67  	}
    68  
    69  	runtime, err := adapter.GetRuntime(getContext(), &c.PodmanCommand)
    70  	if err != nil {
    71  		return errors.Wrapf(err, "error creating libpod runtime")
    72  	}
    73  	defer runtime.DeferredShutdown(false)
    74  
    75  	if c.Latest {
    76  		descriptors = args
    77  	} else {
    78  		descriptors = args[1:]
    79  	}
    80  
    81  	w := tabwriter.NewWriter(os.Stdout, 5, 1, 3, ' ', 0)
    82  	psOutput, err := runtime.PodTop(c, descriptors)
    83  	if err != nil {
    84  		return err
    85  	}
    86  	for _, proc := range psOutput {
    87  		if _, err := fmt.Fprintln(w, proc); err != nil {
    88  			return err
    89  		}
    90  	}
    91  	return w.Flush()
    92  }