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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")
}
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
}
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