| 28 | ) |
| 29 | |
| 30 | func CommandOutput(command string, args ...string) (data []byte, err error) { |
| 31 | cmd := exec.Command(command, args...) |
| 32 | logs.V(9).Infof("start command %v", cmd.Args) |
| 33 | var stdout, stderr bytes.Buffer |
| 34 | cmd.Stdout = &stdout |
| 35 | cmd.Stderr = &stderr |
| 36 | if err := cmd.Start(); err != nil { |
| 37 | if exErr, ok := err.(*exec.Error); ok { |
| 38 | if exErr.Err == exec.ErrNotFound || exErr.Err == os.ErrNotExist { |
| 39 | return nil, fmt.Errorf("command %s not installed on system", command) |
| 40 | } |
| 41 | } |
| 42 | return nil, err |
| 43 | } |
| 44 | |
| 45 | if err := cmd.Wait(); err != nil { |
| 46 | if sysErr, ok := err.(*os.SyscallError); ok { |
| 47 | // ignore error "no child process" |
| 48 | if e := sysErr.Err.(syscall.Errno); e == syscall.ECHILD { |
| 49 | return stdout.Bytes(), nil |
| 50 | } |
| 51 | } else { |
| 52 | logs.Errorf("command [%s] cmd.Wait err %s", cmd.Args, err) |
| 53 | } |
| 54 | logs.V(9).Infof("command %s stdout %s stderr %s", cmd.Args, stdout.Bytes(), stderr.Bytes()) |
| 55 | if exitErr, ok := err.(*exec.ExitError); ok { |
| 56 | if ws, ok := exitErr.Sys().(syscall.WaitStatus); ok { |
| 57 | logs.Errorf("exit code %+v %+v", ws, exitErr) |
| 58 | } |
| 59 | return stderr.Bytes(), fmt.Errorf("command %s execution error", command) |
| 60 | } |
| 61 | return stderr.Bytes(), err |
| 62 | } |
| 63 | return stdout.Bytes(), nil |
| 64 | } |