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# Copyright (C) 2004, 2005 by Canonical Ltd
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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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# 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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# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""A file that does an atomic-rename to move into place.
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This also causes hardlinks to break when it's written out.
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Open this as for a regular file, then use commit() to move into
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place or abort() to cancel.
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You may wish to wrap this in a codecs.EncodedFile to do unicode
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def __init__(self, filename, mode='wb'):
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if mode != 'wb' and mode != 'wt':
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raise ValueError("invalid AtomicFile mode %r" % mode)
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self.tmpfilename = '%s.tmp.%d.%s' % (filename, os.getpid(),
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self.realfilename = filename
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self.f = open(self.tmpfilename, mode)
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self.write = self.f.write
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if sys.platform == 'win32':
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os.remove(self.realfilename)
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os.rename(self.tmpfilename, self.realfilename)
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os.remove(self.tmpfilename)
added
removed
bzrlib/atomicfile.py
