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2ed64cd86b
It catches unused imports at least which is helpful. Ignore some of the more annoying errors. Closes: #15 Approved by: cgwalters
79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
# Copyright (C) 2015 Colin Walters <walters@verbum.org>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import errno
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import os
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from .utils import ensuredir, ensure_clean_dir, rmrf
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class SwappedDirectory(object):
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def __init__(self, path):
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self.path = path
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self.dn = os.path.dirname(self.path)
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self.bn = os.path.basename(self.path)
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self._version = 0
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def read(self):
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if not os.path.islink(self.path):
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subname = '{0}-{1}'.format(self.bn, self._version)
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ensuredir(self.dn + '/' + subname)
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os.symlink(subname, self.path)
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else:
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version = os.readlink(self.path)
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if version.endswith('-0'):
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self._version = 0
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elif version.endswith('-1'):
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self._version = 1
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else:
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raise ValueError("Swapped directory link invalid: {0}".format(version))
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def _newver(self):
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return 1 if self._version == 0 else 0
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def _newdir(self):
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return '{0}-{1}'.format(self.bn, self._newver())
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def _newpath(self):
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return self.dn + '/' + self._newdir()
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def prepare(self, save_partial_dir=None):
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self.read()
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newpath = self._newpath()
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if save_partial_dir is not None:
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try:
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stbuf = os.stat(newpath)
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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stbuf = None
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if stbuf is not None:
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rmrf(save_partial_dir)
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os.rename(newpath, save_partial_dir)
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ensure_clean_dir(newpath)
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return newpath
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def abandon(self):
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newpath = self._newpath()
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rmrf(newpath)
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def commit(self):
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newpath = self._newpath()
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tmplink = newpath + '/' + '__tmplink'
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rmrf(tmplink)
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os.symlink(self._newdir(), tmplink)
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os.rename(tmplink, self.path)
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