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# Copyright (c) 2011 The Chromium OS Authors.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
import os
import subprocess
"""Shell command ease-ups for Python."""
def RunPipe(pipeline, infile=None, outfile=None,
capture=False, oneline=False, hide_stderr=False):
"""
Perform a command pipeline, with optional input/output filenames.
hide_stderr Don't allow output of stderr (default False)
"""
last_pipe = None
while pipeline:
cmd = pipeline.pop(0)
kwargs = {}
if last_pipe is not None:
kwargs['stdin'] = last_pipe.stdout
elif infile:
kwargs['stdin'] = open(infile, 'rb')
if pipeline or capture:
kwargs['stdout'] = subprocess.PIPE
elif outfile:
kwargs['stdout'] = open(outfile, 'wb')
if hide_stderr:
kwargs['stderr'] = open('/dev/null', 'wb')
last_pipe = subprocess.Popen(cmd, **kwargs)
if capture:
ret = last_pipe.communicate()[0]
if not ret:
return None
elif oneline:
return ret.rstrip('\r\n')
else:
return ret
else:
return os.waitpid(last_pipe.pid, 0)[1] == 0
def Output(*cmd):
return RunPipe([cmd], capture=True)
def OutputOneLine(*cmd):
return RunPipe([cmd], capture=True, oneline=True)
def Run(*cmd, **kwargs):
return RunPipe([cmd], **kwargs)
def RunList(cmd):
return RunPipe([cmd], capture=True)
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