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112 lines (98 loc) · 2.19 KB
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Copy pathps.go
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112 lines (98 loc) · 2.19 KB
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package main
import (
"encoding/json"
"errors"
"fmt"
"os"
"os/exec"
"strconv"
"strings"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var psCommand = cli.Command{
Name: "ps",
Usage: "ps displays the processes running inside a container",
ArgsUsage: `<container-id> [ps options]`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "format, f",
Value: "table",
Usage: `select one of: ` + formatOptions,
},
},
Action: func(context *cli.Context) error {
if err := checkArgs(context, 1, minArgs); err != nil {
return err
}
rootlessCg, err := shouldUseRootlessCgroupManager(context)
if err != nil {
return err
}
if rootlessCg {
logrus.Warn("runc ps may fail if you don't have the full access to cgroups")
}
container, err := getContainer(context)
if err != nil {
return err
}
pids, err := container.Processes()
if err != nil {
return err
}
switch context.String("format") {
case "table":
case "json":
return json.NewEncoder(os.Stdout).Encode(pids)
default:
return errors.New("invalid format option")
}
// [1:] is to remove command name, ex:
// context.Args(): [container_id ps_arg1 ps_arg2 ...]
// psArgs: [ps_arg1 ps_arg2 ...]
//
psArgs := context.Args()[1:]
if len(psArgs) == 0 {
psArgs = []string{"-ef"}
}
cmd := exec.Command("ps", psArgs...)
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("%w: %s", err, output)
}
lines := strings.Split(string(output), "\n")
pidIndex, err := getPidIndex(lines[0])
if err != nil {
return err
}
fmt.Println(lines[0])
for _, line := range lines[1:] {
if len(line) == 0 {
continue
}
fields := strings.Fields(line)
p, err := strconv.Atoi(fields[pidIndex])
if err != nil {
return fmt.Errorf("unable to parse pid: %w", err)
}
for _, pid := range pids {
if pid == p {
fmt.Println(line)
break
}
}
}
return nil
},
SkipArgReorder: true,
}
func getPidIndex(title string) (int, error) {
<
37DA
div id="LC102" class="react-file-line html-div" data-testid="code-cell" data-line-number="102" style="position:relative"> titles := strings.Fields(title)
pidIndex := -1
for i, name := range titles {
if name == "PID" {
return i, nil
}
}
return pidIndex, errors.New("couldn't find PID field in ps output")
}