127 lines
4.3 KiB
Python
127 lines
4.3 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2011 The Chromium OS Authors.
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#
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import os
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import cros_subprocess
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"""Shell command ease-ups for Python."""
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class CommandResult:
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"""A class which captures the result of executing a command.
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Members:
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stdout: stdout obtained from command, as a string
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stderr: stderr obtained from command, as a string
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return_code: Return code from command
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exception: Exception received, or None if all ok
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"""
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def __init__(self):
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self.stdout = None
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self.stderr = None
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self.combined = None
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self.return_code = None
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self.exception = None
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def __init__(self, stdout='', stderr='', combined='', return_code=0,
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exception=None):
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self.stdout = stdout
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self.stderr = stderr
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self.combined = combined
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self.return_code = return_code
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self.exception = exception
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# This permits interception of RunPipe for test purposes. If it is set to
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# a function, then that function is called with the pipe list being
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# executed. Otherwise, it is assumed to be a CommandResult object, and is
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# returned as the result for every RunPipe() call.
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# When this value is None, commands are executed as normal.
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test_result = None
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def RunPipe(pipe_list, infile=None, outfile=None,
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capture=False, capture_stderr=False, oneline=False,
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raise_on_error=True, cwd=None, **kwargs):
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"""
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Perform a command pipeline, with optional input/output filenames.
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Args:
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pipe_list: List of command lines to execute. Each command line is
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piped into the next, and is itself a list of strings. For
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example [ ['ls', '.git'] ['wc'] ] will pipe the output of
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'ls .git' into 'wc'.
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infile: File to provide stdin to the pipeline
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outfile: File to store stdout
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capture: True to capture output
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capture_stderr: True to capture stderr
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oneline: True to strip newline chars from output
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kwargs: Additional keyword arguments to cros_subprocess.Popen()
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Returns:
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CommandResult object
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"""
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if test_result:
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if hasattr(test_result, '__call__'):
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result = test_result(pipe_list=pipe_list)
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if result:
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return result
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else:
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return test_result
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# No result: fall through to normal processing
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result = CommandResult()
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last_pipe = None
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pipeline = list(pipe_list)
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user_pipestr = '|'.join([' '.join(pipe) for pipe in pipe_list])
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kwargs['stdout'] = None
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kwargs['stderr'] = None
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while pipeline:
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cmd = pipeline.pop(0)
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if last_pipe is not None:
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kwargs['stdin'] = last_pipe.stdout
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elif infile:
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kwargs['stdin'] = open(infile, 'rb')
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if pipeline or capture:
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kwargs['stdout'] = cros_subprocess.PIPE
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elif outfile:
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kwargs['stdout'] = open(outfile, 'wb')
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if capture_stderr:
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kwargs['stderr'] = cros_subprocess.PIPE
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try:
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last_pipe = cros_subprocess.Popen(cmd, cwd=cwd, **kwargs)
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except Exception as err:
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result.exception = err
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if raise_on_error:
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raise Exception("Error running '%s': %s" % (user_pipestr, str))
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result.return_code = 255
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return result
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if capture:
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result.stdout, result.stderr, result.combined = (
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last_pipe.CommunicateFilter(None))
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if result.stdout and oneline:
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result.output = result.stdout.rstrip('\r\n')
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result.return_code = last_pipe.wait()
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else:
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result.return_code = os.waitpid(last_pipe.pid, 0)[1]
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if raise_on_error and result.return_code:
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raise Exception("Error running '%s'" % user_pipestr)
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return result
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def Output(*cmd, **kwargs):
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raise_on_error = kwargs.get('raise_on_error', True)
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return RunPipe([cmd], capture=True, raise_on_error=raise_on_error).stdout
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def OutputOneLine(*cmd, **kwargs):
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raise_on_error = kwargs.pop('raise_on_error', True)
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return (RunPipe([cmd], capture=True, oneline=True,
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raise_on_error=raise_on_error,
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**kwargs).stdout.strip())
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def Run(*cmd, **kwargs):
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return RunPipe([cmd], **kwargs).stdout
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def RunList(cmd):
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return RunPipe([cmd], capture=True).stdout
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def StopAll():
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cros_subprocess.stay_alive = False
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