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1 # Copyright (C) 2007 by Intevation GmbH |
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2 # Authors: |
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3 # Bernhard Herzog <bh@intevation.de> |
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4 # |
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5 # This program is free software under the GPL (>=v2) |
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6 # Read the file COPYING coming with the software for details. |
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7 |
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8 """Helper functions to run subprocesses in various ways""" |
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9 |
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10 import os |
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11 import subprocess |
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12 |
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13 |
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14 class SubprocessError(EnvironmentError): |
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15 |
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16 def __init__(self, command, returncode): |
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17 EnvironmentError.__init__(self, |
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18 "Command %r finished with return code %d" |
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19 % (command, returncode)) |
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20 self.returncode = returncode |
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21 |
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22 |
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23 def call(command, suppress_output=False, **kw): |
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24 """Run command as a subprocess and wait until it is finished. |
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25 |
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26 The command should be given as a list of strings to avoid problems |
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27 with shell quoting. If the command exits with a return code other |
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28 than 0, a SubprocessError is raised. |
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29 """ |
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30 if suppress_output: |
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31 kw["stdout"] = open(os.devnull, "w") |
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32 ret = subprocess.call(command, **kw) |
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33 if ret != 0: |
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34 raise SubprocessError(command, ret) |
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35 |
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36 |
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37 def capture_output(command, **kw): |
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38 """Return the stdout and stderr of the command as a string |
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39 |
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40 The command should be given as a list of strings to avoid problems |
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41 with shell quoting. If the command exits with a return code other |
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42 than 0, a SubprocessError is raised. |
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43 """ |
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44 proc = subprocess.Popen(command, stdout=subprocess.PIPE, |
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45 stderr=subprocess.STDOUT, **kw) |
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46 output = proc.communicate()[0] |
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47 if proc.returncode != 0: |
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48 raise SubprocessError(command, proc.returncode) |
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49 return output |
