In Python, `os.makedirs()` with 0777 mode does not give others write permission

In Python, os.makedirs() with 0777 mode can not give others write permission

The code is as follows

$ python
Python 2.7.5 (default, Aug  4 2017, 00:39:18) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.makedirs("/tmp/test1/test2", 0777)

The created dirs are not having permission “0777”

$ ls /tmp/test1/ -lrth
total 0
drwxrwxr-x 2 u1 u1 40 Oct 31 17:24 test2

The write ‘w’ permission for other users are not set according to the mode.

What’s wrong and how to fix it?

Your permission bits may be turned off by umask. Try to make umask 000 first:

import os

# make dirs with mode
def mkdir_with_mode(directory, mode):
  if not os.path.isdir(directory):
    oldmask = os.umask(000)
    os.makedirs(directory, 0777)

It will clear the umask first so that the mode provided takes full effect.

Eric Ma

Eric is a systems guy. Eric is interested in building high-performance and scalable distributed systems and related technologies. The views or opinions expressed here are solely Eric's own and do not necessarily represent those of any third parties.

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