New submission from Benjamin Peterson <benja...@python.org>:
With the musl C library, one has failures like this:
======================================================================
FAIL: test_strptime (test.test_time.TimeTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/buildbot/buildarea/3.x.ware-alpine/build/Lib/test/test_time.py", line
273, in test_strptime
time.strptime(strf_output, format)
ValueError: time data '' does not match format '%Z'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/buildbot/buildarea/3.x.ware-alpine/build/Lib/test/test_time.py", line
276, in test_strptime
(format, strf_output))
AssertionError: conversion specifier '%Z' failed with '' input.
----------------------------------------------------------------------
The root problem is that time.strptime('%Z', time.gmtime()) won't work—it
returns an empty string—even though time.gmtime() will probably have a valid
tm_zone field. This is because musl has a safety mechanism where it refuses to
process a tm_zone entry unless it produced the string. (See
https://git.musl-libc.org/cgit/musl/commit/?id=d78be392e144c338f58ce6a51d82c859126c137d.)
As a partial workaround, I propose we check whether an incoming
time.struct_time instance has an tm_zone member equal to tzname[0] or
tzname[1], and place one of those global strings into the C-level tm struct if
they do match.
----------
components: Library (Lib)
messages: 325319
nosy: benjamin.peterson
priority: normal
severity: normal
status: open
title: '%Z' strftime specifier never works with musl
versions: Python 2.7, Python 3.6, Python 3.7, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34672>
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