95 lines
1.7 KiB
Go
95 lines
1.7 KiB
Go
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// +build linux
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package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"github.com/urfave/cli"
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)
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var psCommand = cli.Command{
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Name: "ps",
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Usage: "ps displays the processes running inside a container",
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ArgsUsage: `<container-id> [ps options]`,
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "format, f",
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Value: "",
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Usage: `select one of: ` + formatOptions,
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},
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},
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Action: func(context *cli.Context) error {
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container, err := getContainer(context)
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if err != nil {
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return err
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}
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pids, err := container.Processes()
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if err != nil {
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return err
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}
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if context.String("format") == "json" {
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if err := json.NewEncoder(os.Stdout).Encode(pids); err != nil {
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return err
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}
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return nil
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}
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psArgs := context.Args().Get(1)
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if psArgs == "" {
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psArgs = "-ef"
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}
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output, err := exec.Command("ps", strings.Split(psArgs, " ")...).Output()
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if err != nil {
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return err
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}
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lines := strings.Split(string(output), "\n")
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pidIndex, err := getPidIndex(lines[0])
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if err != nil {
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return err
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}
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fmt.Println(lines[0])
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for _, line := range lines[1:] {
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if len(line) == 0 {
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continue
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}
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fields := strings.Fields(line)
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p, err := strconv.Atoi(fields[pidIndex])
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if err != nil {
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return fmt.Errorf("unexpected pid '%s': %s", fields[pidIndex], err)
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}
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for _, pid := range pids {
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if pid == p {
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fmt.Println(line)
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break
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}
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}
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}
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return nil
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},
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}
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func getPidIndex(title string) (int, error) {
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titles := strings.Fields(title)
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pidIndex := -1
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for i, name := range titles {
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if name == "PID" {
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return i, nil
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}
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}
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return pidIndex, fmt.Errorf("couldn't find PID field in ps output")
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}
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