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package main
import (
"fmt"
"os"
"strings"
"text/tabwriter"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/rootless"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
func getDescriptorString() string {
descriptors, err := libpod.GetContainerPidInformationDescriptors()
if err == nil {
return fmt.Sprintf(`
Format Descriptors:
%s`, strings.Join(descriptors, ","))
}
return ""
}
var (
topFlags = []cli.Flag{
LatestFlag,
cli.BoolFlag{
Name: "list-descriptors",
Hidden: true,
},
}
topDescription = fmt.Sprintf(`Display the running processes of the container. Specify format descriptors
to alter the output. You may run "podman top -l pid pcpu seccomp" to print
the process ID, the CPU percentage and the seccomp mode of each process of
the latest container.
%s
`, getDescriptorString())
topCommand = cli.Command{
Name: "top",
Usage: "Display the running processes of a container",
Description: topDescription,
Flags: sortFlags(topFlags),
Action: topCmd,
ArgsUsage: "CONTAINER-NAME [format descriptors]",
SkipArgReorder: true,
OnUsageError: usageErrorHandler,
}
)
func topCmd(c *cli.Context) error {
var container *libpod.Container
var err error
args := c.Args()
if c.Bool("list-descriptors") {
descriptors, err := libpod.GetContainerPidInformationDescriptors()
if err != nil {
return err
}
fmt.Println(strings.Join(descriptors, "\n"))
return nil
}
if len(args) < 1 && !c.Bool("latest") {
return errors.Errorf("you must provide the name or id of a running container")
}
if err := validateFlags(c, topFlags); err != nil {
return err
}
rootless.SetSkipStorageSetup(true)
runtime, err := libpodruntime.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
var descriptors []string
if c.Bool("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))
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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