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bzrlib/tests/features.py

 

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# Copyright (C) 2009, 2010 Canonical Ltd

 

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#

 

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# This program is free software; you can redistribute it and/or modify

 

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# it under the terms of the GNU General Public License as published by

 

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# the Free Software Foundation; either version 2 of the License, or

 

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# (at your option) any later version.

 

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#

 

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# This program is distributed in the hope that it will be useful,

 

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

 

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 

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# GNU General Public License for more details.

 

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#

 

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# You should have received a copy of the GNU General Public License

 

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# along with this program; if not, write to the Free Software

 

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 

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import os

 

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import stat

 

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from bzrlib import tests

 

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from bzrlib.symbol_versioning import deprecated_in

 

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apport = tests.ModuleAvailableFeature('apport')

 

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paramiko = tests.ModuleAvailableFeature('paramiko')

 

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pycurl = tests.ModuleAvailableFeature('pycurl')

 

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subunit = tests.ModuleAvailableFeature('subunit')

 

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class _PosixPermissionsFeature(tests.Feature):

 

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    def _probe(self):

 

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        def has_perms():

 

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            # create temporary file and check if specified perms are maintained.

 

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            import tempfile

 

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            write_perms = stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR

 

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            f = tempfile.mkstemp(prefix='bzr_perms_chk_')

 

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            fd, name = f

 

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            os.close(fd)

 

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            os.chmod(name, write_perms)

 

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            read_perms = os.stat(name).st_mode & 0777

 

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            os.unlink(name)

 

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            return (write_perms == read_perms)

 

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        return (os.name == 'posix') and has_perms()

 

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    def feature_name(self):

 

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        return 'POSIX permissions support'

 

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posix_permissions_feature = _PosixPermissionsFeature()

 

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class _ChownFeature(tests.Feature):

 

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    """os.chown is supported"""

 

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    def _probe(self):

 

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        return os.name == 'posix' and hasattr(os, 'chown')

 

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chown_feature = _ChownFeature()

 

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