enhancing os.chown functionality

[gyrof]

BPO	1200804
Nosy	@loewis, @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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GitHub fields:

assignee = None
closed_at = <Date 2005-06-01.20:37:43.000>
created_at = <Date 2005-05-12.16:26:34.000>
labels = ['extension-modules', 'type-feature']
title = 'enhancing os.chown functionality'
updated_at = <Date 2005-06-01.20:37:43.000>
user = 'https://bugs.python.org/gyrof'

bugs.python.org fields:

activity = <Date 2005-06-01.20:37:43.000>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2005-05-12.16:26:34.000>
creator = 'gyrof'
dependencies = []
files = []
hgrepos = []
issue_num = 1200804
keywords = []
message_count = 4.0
messages = ['54521', '54522', '54523', '54524']
nosy_count = 4.0
nosy_names = ['loewis', 'jepler', 'georg.brandl', 'gyrof']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue1200804'
versions = []

[gyrof]

Hi,
I don't think it is currently possible (with os.chown
or any other Python library function) to change the
groupId of a file without specifying the userId (like
posix 'chgrp' does), or to change the userId without
specifying the groupId.
I would suggest adding the option of having os.chown
accept None as either the userId or groupId, and having
the function change only the 'non-None' portion of the
file ownership.

Thanks for your consideration.

-g

[jepler]

Logged In: YES
user_id=2772

the posix (os) module is intended as a thin wrapper around
operating system services. The chown(2) syscall requires
that owner and group both be specified.

Possibly an enhanced chownonly/chgrp would find a home in
the 'shutil' module.

Possibly translating a parameter of None into -1 (which
means 'no change') would be accepted as a patch.

[loewis]

Logged In: YES
user_id=21627

Jeff already provided the right analysis: It *is* currently
possibly with os.chown to only change the groupid without
specifying the userid: just pass -1 as the userid. The
requested feature is already there, so I'm rejecting this
request.

[birkenfeld]

Logged In: YES
user_id=1188172

I've create patch bpo-1213031 which includes a note in the docs
about this.