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jaraco.compat / py26compat / subprocess.py

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from __future__ import absolute_import

import subprocess

try:
	check_output = subprocess.check_output
except AttributeError:
	# copied from Python 2.7.2
	def check_output(*popenargs, **kwargs):
		r"""Run command with arguments and return its output as a byte string.

		If the exit code was non-zero it raises a CalledProcessError.  The
		CalledProcessError object will have the return code in the returncode
		attribute and output in the output attribute.

		The arguments are the same as for the Popen constructor.  Example:

		>>> check_output(["ls", "-l", "/dev/null"])
		'crw-rw-rw- 1 root root 1, 3 Oct 18  2007 /dev/null\n'

		The stdout argument is not allowed as it is used internally.
		To capture standard error in the result, use stderr=STDOUT.

		>>> check_output(["/bin/sh", "-c",
		...               "ls -l non_existent_file ; exit 0"],
		...              stderr=STDOUT)
		'ls: non_existent_file: No such file or directory\n'
		"""
		if 'stdout' in kwargs:
			raise ValueError('stdout argument not allowed, it will be overridden.')
		process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
		output, unused_err = process.communicate()
		retcode = process.poll()
		if retcode:
			cmd = kwargs.get("args")
			if cmd is None:
				cmd = popenargs[0]
			err = subprocess.CalledProcessError(retcode, cmd)
			err.output = output
			raise err
		return output