| Simon Glass | 2613288 | 2012-01-14 15:12:45 +0000 | [diff] [blame^] | 1 | # Copyright (c) 2011 The Chromium OS Authors. |
| 2 | # |
| 3 | # See file CREDITS for list of people who contributed to this |
| 4 | # project. |
| 5 | # |
| 6 | # This program is free software; you can redistribute it and/or |
| 7 | # modify it under the terms of the GNU General Public License as |
| 8 | # published by the Free Software Foundation; either version 2 of |
| 9 | # the License, or (at your option) any later version. |
| 10 | # |
| 11 | # This program is distributed in the hope that it will be useful, |
| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | # GNU General Public License for more details. |
| 15 | # |
| 16 | # You should have received a copy of the GNU General Public License |
| 17 | # along with this program; if not, write to the Free Software |
| 18 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 19 | # MA 02111-1307 USA |
| 20 | # |
| 21 | |
| 22 | import os |
| 23 | import subprocess |
| 24 | |
| 25 | """Shell command ease-ups for Python.""" |
| 26 | |
| 27 | def RunPipe(pipeline, infile=None, outfile=None, |
| 28 | capture=False, oneline=False, hide_stderr=False): |
| 29 | """ |
| 30 | Perform a command pipeline, with optional input/output filenames. |
| 31 | |
| 32 | hide_stderr Don't allow output of stderr (default False) |
| 33 | """ |
| 34 | last_pipe = None |
| 35 | while pipeline: |
| 36 | cmd = pipeline.pop(0) |
| 37 | kwargs = {} |
| 38 | if last_pipe is not None: |
| 39 | kwargs['stdin'] = last_pipe.stdout |
| 40 | elif infile: |
| 41 | kwargs['stdin'] = open(infile, 'rb') |
| 42 | if pipeline or capture: |
| 43 | kwargs['stdout'] = subprocess.PIPE |
| 44 | elif outfile: |
| 45 | kwargs['stdout'] = open(outfile, 'wb') |
| 46 | if hide_stderr: |
| 47 | kwargs['stderr'] = open('/dev/null', 'wb') |
| 48 | |
| 49 | last_pipe = subprocess.Popen(cmd, **kwargs) |
| 50 | |
| 51 | if capture: |
| 52 | ret = last_pipe.communicate()[0] |
| 53 | if not ret: |
| 54 | return None |
| 55 | elif oneline: |
| 56 | return ret.rstrip('\r\n') |
| 57 | else: |
| 58 | return ret |
| 59 | else: |
| 60 | return os.waitpid(last_pipe.pid, 0)[1] == 0 |
| 61 | |
| 62 | def Output(*cmd): |
| 63 | return RunPipe([cmd], capture=True) |
| 64 | |
| 65 | def OutputOneLine(*cmd): |
| 66 | return RunPipe([cmd], capture=True, oneline=True) |
| 67 | |
| 68 | def Run(*cmd, **kwargs): |
| 69 | return RunPipe([cmd], **kwargs) |
| 70 | |
| 71 | def RunList(cmd): |
| 72 | return RunPipe([cmd], capture=True) |