os.chmod failure

[rgheck]

BPO	1767242
Nosy	@birkenfeld

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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assignee = None
closed_at = <Date 2007-09-07.07:40:37.277>
created_at = <Date 2007-08-03.18:02:26.000>
labels = []
title = 'os.chmod failure'
updated_at = <Date 2007-09-07.07:40:37.276>
user = 'https://bugs.python.org/rgheck'

bugs.python.org fields:

activity = <Date 2007-09-07.07:40:37.276>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2007-09-07.07:40:37.277>
closer = 'georg.brandl'
components = ['None']
creation = <Date 2007-08-03.18:02:26.000>
creator = 'rgheck'
dependencies = []
files = []
hgrepos = []
issue_num = 1767242
keywords = []
message_count = 4.0
messages = ['32580', '32581', '32582', '32583']
nosy_count = 3.0
nosy_names = ['nnorwitz', 'georg.brandl', 'rgheck']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1767242'
versions = []

Linked PRs

• GH-89435: os.path should not be a frozen module #126924

[rgheck]

When running on Linux and accessing a FAT partition, os.chmod fails with otherwise sensible partitions:
>>> os.chmod("/media/IHP-100/Test.lyx", 400)
>>> os.chmod("/media/IHP-100/Test.lyx", 600)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OSError: [Errno 1] Operation not permitted: '/media/IHP-100/Test.lyx'
The only thing that seems to be allowed is `4'.

[birkenfeld]

Why do you think this is Python's fault? os.chmod() is only a very thin wrapper around the OS' chmod().

[rgheck]

Well, the shell's chmod doesn't return an error.

[rgheck@rghstudy scripts]$ chmod 600 /media/IHP-100/Test.lyx
[rgheck@rghstudy scripts]$ echo $?
0
[rgheck@rghstudy scripts]$ chmod 400 /media/IHP-100/Test.lyx
[rgheck@rghstudy scripts]$ echo $?
0
[rgheck@rghstudy scripts]$ chmod 700 /media/IHP-100/Test.lyx
[rgheck@rghstudy scripts]$ echo $?
0
[rgheck@rghstudy scripts]$ python
Python 2.4.4 (#1, Oct 23 2006, 13:58:00)
[GCC 4.1.1 20061011 (Red Hat 4.1.1-30)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.chmod("/media/IHP-100/Test.lyx", 400)
>>> os.chmod("/media/IHP-100/Test.lyx", 600)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OSError: [Errno 1] Operation not permitted: '/media/IHP-100/Test.lyx'

I don't know what would happen in C, say.

[nnorwitz]

Note: you are *not* using octal in python, but the chmod program is using octal:

Try prefixing 400/600 with a zero, ie: 0400 or 0600.