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Viewing changes to Tools/freeze/bkfile.py

  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2009-02-13 12:51:00 UTC
  • Revision ID: james.westby@ubuntu.com-20090213125100-uufgcb9yeqzujpqw
Tags: upstream-2.6.1
Import upstream version 2.6.1

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Lines of Context:
Tools/freeze/bkfile.py
 
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_orig_open = open
 
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class _BkFile:
 
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    def __init__(self, file, mode, bufsize):
 
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        import os
 
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        self.__filename = file
 
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        self.__backup = file + '~'
 
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        try:
 
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            os.unlink(self.__backup)
 
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        except os.error:
 
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            pass
 
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        try:
 
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            os.rename(file, self.__backup)
 
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        except os.error:
 
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            self.__backup = None
 
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        self.__file = _orig_open(file, mode, bufsize)
 
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        self.closed = self.__file.closed
 
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        self.fileno = self.__file.fileno
 
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        self.flush = self.__file.flush
 
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        self.isatty = self.__file.isatty
 
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        self.mode = self.__file.mode
 
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        self.name = self.__file.name
 
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        self.read = self.__file.read
 
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        self.readinto = self.__file.readinto
 
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        self.readline = self.__file.readline
 
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        self.readlines = self.__file.readlines
 
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        self.seek = self.__file.seek
 
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        self.softspace = self.__file.softspace
 
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        self.tell = self.__file.tell
 
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        self.truncate = self.__file.truncate
 
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        self.write = self.__file.write
 
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        self.writelines = self.__file.writelines
 
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    def close(self):
 
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        self.__file.close()
 
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        if self.__backup is None:
 
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            return
 
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        import filecmp
 
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        if filecmp.cmp(self.__backup, self.__filename, shallow = 0):
 
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            import os
 
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            os.unlink(self.__filename)
 
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            os.rename(self.__backup, self.__filename)
 
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def open(file, mode = 'r', bufsize = -1):
 
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    if 'w' not in mode:
 
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        return _orig_open(file, mode, bufsize)
 
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    return _BkFile(file, mode, bufsize)