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bzrlib/transform.py
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            if trans_id not in self._new_contents:
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                continue
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            new_path = self._limbo_name(trans_id)
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            os.rename(old_path, new_path)
 
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            osutils.rename(old_path, new_path)
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            for descendant in self._limbo_descendants(trans_id):
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                desc_path = self._limbo_files[descendant]
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                desc_path = new_path + desc_path[len(old_path):]
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    def rename(self, from_, to):
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        """Rename a file from one path to another."""
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        try:
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            os.rename(from_, to)
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        except OSError, e:
 
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            osutils.rename(from_, to)
 
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        except (IOError, OSError), e:
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            if e.errno in (errno.EEXIST, errno.ENOTEMPTY):
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                raise errors.FileExists(to, str(e))
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            # normal OSError doesn't include filenames so it's hard to see where
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        """Reverse all renames that have been performed"""
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        for from_, to in reversed(self.past_renames):
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            try:
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                os.rename(to, from_)
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            except OSError, e:
 
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                osutils.rename(to, from_)
 
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            except (OSError, IOError), e:
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                raise errors.TransformRenameFailed(to, from_, str(e), e.errno)                
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        # after rollback, don't reuse _FileMover
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        past_renames = None