Source code for taurus.core.util.whichexecutable

#!/usr/bin/env python

#############################################################################
##
# This file is part of Taurus
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# http://taurus-scada.org
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# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
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# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
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# Taurus is distributed in the hope that it will be useful,
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# GNU Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public License
# along with Taurus.  If not, see <http://www.gnu.org/licenses/>.
##
#############################################################################

"""Find path of executable specified by filename"""

__all__ = ["whichfile"]

__docformat__ = "restructuredtext"


import os


[docs]def whichfile(filename, exts=None): '''Find path of executable specified by filename. It Takes into consideration the PATHEXT variable (found in MS Windows systems) to try also executable names extended with executable extensions. Example:: # on a debian machine with taurus installed in the default path: whichfile('taurus') --> '/usr/bin/taurus' # or, on a winXP machine: whichfile('command') --> 'C:\\WINDOWS\\system32\\command.COM' :param filename: (str) executable name. :param exts: (list<str>) a list of valid executable extensions. If None given, the PATHEXT environmental variable is used if available. :return: (str) absolute path to the executable in the file system ''' path = os.getenv('PATH', '').split(os.path.pathsep) if exts is None: exts = os.getenv('PATHEXT', '').split(os.path.pathsep) if '' not in exts: exts.insert(0, '') for p in path: p = os.path.join(p, filename) for e in exts: pext = p + e if os.access(pext, os.X_OK): return pext return None