/usr/lib/python2.7/dist-packages/minidinstall/SafeWriteFile.py is in mini-dinstall 0.6.30ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | # SafeWriteFile.py
#
# This file is a writable file object. It writes to a specified newname,
# and when closed, renames the file to the realname. If the object is
# deleted, without being closed, this rename isn't done. If abort() is
# called, it also disables the rename.
#
# Copyright 2001 Adam Heath <doogie@debian.org>
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
from types import StringType
from shutil import copy2
from string import find
from os import rename
class ObjectNotAllowed(Exception):
pass
class InvalidMode(Exception):
pass
class SafeWriteFile:
def __init__(self, newname, realname, mode="w", bufsize=-1):
if type(newname)!=StringType:
raise ObjectNotAllowed(newname)
if type(realname)!=StringType:
raise ObjectNotAllowed(realname)
if find(mode, "r")>=0:
raise InvalidMode(mode)
if find(mode, "a")>=0 or find(mode, "+") >= 0:
copy2(realname, newname)
self.fobj=open(newname, mode, bufsize)
self.newname=newname
self.realname=realname
self.__abort=0
def close(self):
self.fobj.close()
if not (self.closed and self.__abort):
rename(self.newname, self.realname)
def abort(self):
self.__abort=1
def __del__(self):
self.abort()
del self.fobj
def __getattr__(self, attr):
try:
return self.__dict__[attr]
except:
return eval("self.fobj." + attr)
if __name__ == "__main__":
import time
f=SafeWriteFile("sf.new", "sf.data")
f.write("test\n")
f.flush()
time.sleep(1)
f.close()
# vim:ts=4:sw=4:et:
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