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@mccutchen
Created June 12, 2012 18:50
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run_proc.py
def run_proc(cmd, stdin=None, env=None):
"""Runs the given cmd as a subprocess, where cmd is a list suitable
for passing to subprocess.call. Returns a 3-tuple of
(exit code, stdout, stderr)
If stdin is not None, it will be passed into the subprocess on STDIN. If
env is not None, it will be used to augment the environment of the
subprocess.
"""
assert isinstance(cmd, (list, tuple))
popen_args = dict(stdout=subprocess.PIPE, stderr=subprocess.PIPE)
if stdin is not None:
popen_args['stdin'] = subprocess.PIPE
if env is not None:
new_env = os.environ.copy()
new_env.update(env)
popen_args['env'] = new_env
proc = subprocess.Popen(cmd, **popen_args)
out, err = proc.communicate(input=stdin)
return proc.returncode, out.strip(), err.strip()
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