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import sys
from subprocess import Popen, CalledProcessError, PIPE
def check_output(*args, **kwargs):
# subprocess.check_output does not exist on python26
if "universal_newlines" not in kwargs:
kwargs["universal_newlines"] = True
popen = Popen(stdout=PIPE, *args, **kwargs)
output, unused_err = popen.communicate()
retcode = popen.poll()
if retcode:
cmd = kwargs.get("args")
if cmd is None:
cmd = args[0]
if sys.version_info < (2,7):
raise CalledProcessError(retcode, cmd)
else:
raise CalledProcessError(retcode, cmd, output=output)
return output
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