/usr/share/pyshared/Pyste/SmartFile.py is in libboost-python1.58-dev 1.58.0+dfsg-5ubuntu3.
This file is owned by root:root, with mode 0o644.
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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 | # Copyright Bruno da Silva de Oliveira 2003. Use, modification and
# distribution is subject to the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
import os
import md5
#==============================================================================
# SmartFile
#==============================================================================
class SmartFile(object):
'''
A file-like object used for writing files. The given file will only be
actually written to disk if there's not a file with the same name, or if
the existing file is *different* from the file to be written.
'''
def __init__(self, filename, mode='w'):
self.filename = filename
self.mode = mode
self._contents = []
self._closed = False
def __del__(self):
if not self._closed:
self.close()
def write(self, string):
self._contents.append(string)
def _dowrite(self, contents):
f = file(self.filename, self.mode)
f.write(contents)
f.close()
def _GetMD5(self, string):
return md5.new(string).digest()
def close(self):
# if the filename doesn't exist, write the file right away
this_contents = ''.join(self._contents)
if not os.path.isfile(self.filename):
self._dowrite(this_contents)
else:
# read the contents of the file already in disk
f = file(self.filename)
other_contents = f.read()
f.close()
# test the md5 for both files
this_md5 = self._GetMD5(this_contents)
other_md5 = self._GetMD5(other_contents)
if this_md5 != other_md5:
self._dowrite(this_contents)
self._closed = True
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