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Jason R. Coombs committed 7b60008

Adding py26compat.subprocess with check_output

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+1.0
+~~~
+
+* Adding `py26compat.subprocess.check_output`.
+
 0.9
 ~~~
 

py26compat/subprocess.py

+from __future__ import absolute_import
+
+import subprocess
+
+try:
+	check_call = subprocess.check_call
+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]
+			raise subprocess.CalledProcessError(retcode, cmd, output=output)
+		return output