45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
from __future__ import absolute_import
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from subprocess import *
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# Provide Python 2.7's check_output() function.
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try:
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check_output
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except NameError:
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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=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 = Popen(stdout=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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error = CalledProcessError(retcode, cmd)
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# Add the output attribute to CalledProcessError, which
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# doesn't exist until Python 2.7.
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error.output = output
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raise error
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return output
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