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from __future__ import absolute_import
__doc__="""Useful functions for interacting with processes."""
import sys
import os
import subprocess
def backticks( cmd, merge_stderr=True ):
"""
Simulates the perl backticks (``) command with error-handling support
Returns ( command output as sequence of strings, error code, error message )
"""
if merge_stderr:
_stderr = subprocess.STDOUT
else:
_stderr = subprocess.PIPE
p = subprocess.Popen( cmd, shell=True, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=_stderr,
close_fds=True )
out = [ l[:-1] for l in p.stdout.readlines() ]
p.stdout.close()
if not merge_stderr:
p.stderr.close()
# need to allow process to terminate
p.wait()
errCode = p.returncode and p.returncode or 0
if p.returncode>0:
errorMessage = os.linesep.join(out)
output = []
else:
errorMessage = ''
output = out
return output, errCode, errorMessage
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