--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/treepkg/run.py	Tue Mar 06 17:37:32 2007 +0100
@@ -0,0 +1,49 @@
+# Copyright (C) 2007 by Intevation GmbH
+# Authors:
+# Bernhard Herzog <bh@intevation.de>
+#
+# This program is free software under the GPL (>=v2)
+# Read the file COPYING coming with the software for details.
+
+"""Helper functions to run subprocesses in various ways"""
+
+import os
+import subprocess
+
+
+class SubprocessError(EnvironmentError):
+
+    def __init__(self, command, returncode):
+        EnvironmentError.__init__(self,
+                                  "Command %r finished with return code %d"
+                                  % (command, returncode))
+        self.returncode = returncode
+
+
+def call(command, suppress_output=False, **kw):
+    """Run command as a subprocess and wait until it is finished.
+
+    The command should be given as a list of strings to avoid problems
+    with shell quoting.  If the command exits with a return code other
+    than 0, a SubprocessError is raised.
+    """
+    if suppress_output:
+        kw["stdout"] = open(os.devnull, "w")
+    ret = subprocess.call(command, **kw)
+    if ret != 0:
+        raise SubprocessError(command, ret)
+
+
+def capture_output(command, **kw):
+    """Return the stdout and stderr of the command as a string
+
+    The command should be given as a list of strings to avoid problems
+    with shell quoting.  If the command exits with a return code other
+    than 0, a SubprocessError is raised.
+    """
+    proc = subprocess.Popen(command, stdout=subprocess.PIPE,
+                            stderr=subprocess.STDOUT, **kw)
+    output = proc.communicate()[0]
+    if proc.returncode != 0:
+        raise SubprocessError(command, proc.returncode)
+    return output