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Issue #22826: The result of open() in Tools/freeze/bkfile.py is now better

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compatible with regular files (in particular it now supports the context
management protocol).
This commit is contained in:
Serhiy Storchaka 2015-03-20 09:21:59 +02:00
parent 8490f5acfe
commit 53c3fb186a
4 changed files with 59 additions and 87 deletions
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67
Tools/freeze/bkfile.py
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@ -1,49 +1,26 @@
from builtins import open as _orig_open
class _BkFile:
def __init__(self, file, mode, bufsize):
import os
self.__filename = file
self.__backup = file + '~'
try:
os.unlink(self.__backup)
except OSError:
pass
try:
os.rename(file, self.__backup)
except OSError:
self.__backup = None
self.__file = _orig_open(file, mode, bufsize)
self.closed = self.__file.closed
self.fileno = self.__file.fileno
self.flush = self.__file.flush
self.isatty = self.__file.isatty
self.mode = self.__file.mode
self.name = self.__file.name
self.read = self.__file.read
try:
self.readinto = self.__file.readinto
except AttributeError:
pass
self.readline = self.__file.readline
self.readlines = self.__file.readlines
self.seek = self.__file.seek
self.tell = self.__file.tell
self.truncate = self.__file.truncate
self.write = self.__file.write
self.writelines = self.__file.writelines
def close(self):
self.__file.close()
if self.__backup is None:
return
import filecmp
if filecmp.cmp(self.__backup, self.__filename, shallow = 0):
import os
os.unlink(self.__filename)
os.rename(self.__backup, self.__filename)
def open(file, mode = 'r', bufsize = -1):
def open(file, mode='r', bufsize=-1):
if 'w' not in mode:
return _orig_open(file, mode, bufsize)
return _BkFile(file, mode, bufsize)
import os
backup = file + '~'
try:
os.unlink(backup)
except OSError:
pass
try:
os.rename(file, backup)
except OSError:
return _orig_open(file, mode, bufsize)
f = _orig_open(file, mode, bufsize)
_orig_close = f.close
def close():
_orig_close()
import filecmp
if filecmp.cmp(backup, file, shallow=False):
import os
os.unlink(file)
os.rename(backup, file)
f.close = close
return f