xattr support missing in os module under cygwin

[enok2]

BPO	45868
Nosy	@iritkatriel
Superseder	bpo-45537: Cygwin is unsupported - close all open issues and list them here.

^{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 2022-01-23.20:10:01.267>
created_at = <Date 2021-11-22.12:39:12.588>
labels = ['type-bug', '3.8', 'build']
title = 'xattr support missing in os module under cygwin'
updated_at = <Date 2022-01-23.20:10:01.266>
user = 'https://bugs.python.org/enok2'

bugs.python.org fields:

activity = <Date 2022-01-23.20:10:01.266>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2022-01-23.20:10:01.267>
closer = 'iritkatriel'
components = ['Build']
creation = <Date 2021-11-22.12:39:12.588>
creator = 'enok2'
dependencies = []
files = []
hgrepos = []
issue_num = 45868
keywords = []
message_count = 4.0
messages = ['406768', '411414', '411415', '411417']
nosy_count = 2.0
nosy_names = ['iritkatriel', 'enok2']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = '45537'
type = 'behavior'
url = 'https://bugs.python.org/issue45868'
versions = ['Python 3.8']

Linked PRs

• gh-90026: support XATTRs on Cygwin #105075

[enok2]

With the latest Python 3.8.10 under cygwin the following fails:

>>> import os
>>> os.listxattr('.')
Traceback (most recent call last):
  File "<stdin>", line 1, in < module>
AttributeError: module 'os' has no attribute 'listxattr'

/usr/include/attr/xattr.h declares the corresponding library functions, so something must be wrong in the configuration/compilation of python itself.

[iritkatriel]

This is listed in the docs as a linux-only feature:

https://docs.python.org/3/library/os.html#linux-extended-attributes

[enok2]

Perhaps it could be supported under cygwin though without too much effort? Most likely just a configuration fix?

After all, cygwin is a sort of linux ...