63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# subprocess - Subprocesses with accessible I/O streams
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#
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# For more information about this module, see PEP 324.
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#
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# This module should remain compatible with Python 2.2, see PEP 291.
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#
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# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
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#
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# Licensed to PSF under a Contributor Agreement.
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# See http://www.python.org/2.4/license for licensing details.
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#
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# Incorporated here to support Python 2.6 - this is the Python 2.7 version of
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# this function.
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import subprocess
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class CalledProcessError(subprocess.CalledProcessError):
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def __init__(self, returncode, cmd, output=None):
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self.returncode = returncode
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self.cmd = cmd
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self.output = output
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def check_output(*popenargs, **kwargs):
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r"""Run command with arguments and return its output as a byte string.
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If the exit code was non-zero it raises a CalledProcessError. The
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CalledProcessError object will have the return code in the returncode
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attribute and output in the output attribute.
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The arguments are the same as for the Popen constructor. Example:
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>>> check_output(["ls", "-l", "/dev/null"])
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'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
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The stdout argument is not allowed as it is used internally.
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To capture standard error in the result, use stderr=STDOUT.
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>>> check_output(["/bin/sh", "-c",
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... "ls -l non_existent_file ; exit 0"],
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... stderr=subprocess.STDOUT)
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'ls: non_existent_file: No such file or directory\n'
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"""
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if 'stdout' in kwargs:
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raise ValueError('stdout argument not allowed, it will be overridden.')
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process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
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output, unused_err = process.communicate()
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retcode = process.poll()
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if retcode:
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cmd = kwargs.get("args")
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if cmd is None:
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cmd = popenargs[0]
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raise subprocess.CalledProcessError(retcode, cmd, output=output)
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return output
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if not getattr(subprocess, 'check_output', None):
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subprocess.check_output = check_output
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subprocess.CalledProcessError = CalledProcessError
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