# 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
+# SPDX-License-Identifier: GPL-2.0+
#
import os
-import subprocess
+import cros_subprocess
"""Shell command ease-ups for Python."""
-def RunPipe(pipeline, infile=None, outfile=None,
- capture=False, oneline=False, hide_stderr=False):
+class CommandResult:
+ """A class which captures the result of executing a command.
+
+ Members:
+ stdout: stdout obtained from command, as a string
+ stderr: stderr obtained from command, as a string
+ return_code: Return code from command
+ exception: Exception received, or None if all ok
+ """
+ def __init__(self):
+ self.stdout = None
+ self.stderr = None
+ self.combined = None
+ self.return_code = None
+ self.exception = None
+
+ def __init__(self, stdout='', stderr='', combined='', return_code=0,
+ exception=None):
+ self.stdout = stdout
+ self.stderr = stderr
+ self.combined = combined
+ self.return_code = return_code
+ self.exception = exception
+
+
+# This permits interception of RunPipe for test purposes. If it is set to
+# a function, then that function is called with the pipe list being
+# executed. Otherwise, it is assumed to be a CommandResult object, and is
+# returned as the result for every RunPipe() call.
+# When this value is None, commands are executed as normal.
+test_result = None
+
+def RunPipe(pipe_list, infile=None, outfile=None,
+ capture=False, capture_stderr=False, oneline=False,
+ raise_on_error=True, cwd=None, **kwargs):
"""
Perform a command pipeline, with optional input/output filenames.
- hide_stderr Don't allow output of stderr (default False)
+ Args:
+ pipe_list: List of command lines to execute. Each command line is
+ piped into the next, and is itself a list of strings. For
+ example [ ['ls', '.git'] ['wc'] ] will pipe the output of
+ 'ls .git' into 'wc'.
+ infile: File to provide stdin to the pipeline
+ outfile: File to store stdout
+ capture: True to capture output
+ capture_stderr: True to capture stderr
+ oneline: True to strip newline chars from output
+ kwargs: Additional keyword arguments to cros_subprocess.Popen()
+ Returns:
+ CommandResult object
"""
+ if test_result:
+ if hasattr(test_result, '__call__'):
+ return test_result(pipe_list=pipe_list)
+ return test_result
+ result = CommandResult()
last_pipe = None
+ pipeline = list(pipe_list)
+ user_pipestr = '|'.join([' '.join(pipe) for pipe in pipe_list])
+ kwargs['stdout'] = None
+ kwargs['stderr'] = 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
+ kwargs['stdout'] = cros_subprocess.PIPE
elif outfile:
kwargs['stdout'] = open(outfile, 'wb')
- if hide_stderr:
- kwargs['stderr'] = open('/dev/null', 'wb')
+ if capture_stderr:
+ kwargs['stderr'] = cros_subprocess.PIPE
- last_pipe = subprocess.Popen(cmd, **kwargs)
+ try:
+ last_pipe = cros_subprocess.Popen(cmd, cwd=cwd, **kwargs)
+ except Exception, err:
+ result.exception = err
+ if raise_on_error:
+ raise Exception("Error running '%s': %s" % (user_pipestr, str))
+ result.return_code = 255
+ return result
if capture:
- ret = last_pipe.communicate()[0]
- if not ret:
- return None
- elif oneline:
- return ret.rstrip('\r\n')
- else:
- return ret
+ result.stdout, result.stderr, result.combined = (
+ last_pipe.CommunicateFilter(None))
+ if result.stdout and oneline:
+ result.output = result.stdout.rstrip('\r\n')
+ result.return_code = last_pipe.wait()
else:
- return os.waitpid(last_pipe.pid, 0)[1] == 0
+ result.return_code = os.waitpid(last_pipe.pid, 0)[1]
+ if raise_on_error and result.return_code:
+ raise Exception("Error running '%s'" % user_pipestr)
+ return result
def Output(*cmd):
- return RunPipe([cmd], capture=True)
+ return RunPipe([cmd], capture=True, raise_on_error=False).stdout
-def OutputOneLine(*cmd):
- return RunPipe([cmd], capture=True, oneline=True)
+def OutputOneLine(*cmd, **kwargs):
+ raise_on_error = kwargs.pop('raise_on_error', True)
+ return (RunPipe([cmd], capture=True, oneline=True,
+ raise_on_error=raise_on_error,
+ **kwargs).stdout.strip())
def Run(*cmd, **kwargs):
- return RunPipe([cmd], **kwargs)
+ return RunPipe([cmd], **kwargs).stdout
def RunList(cmd):
- return RunPipe([cmd], capture=True)
+ return RunPipe([cmd], capture=True).stdout
+
+def StopAll():
+ cros_subprocess.stay_alive = False
projects / karo-tx-uboot.git / blobdiff