Re: bug report: symbolic-ref --short command echos the wrong text while use Chinese language

From: Eric Sunshine <sunshine@sunshineco.com>
Date: Feb 14, 2023, 06:55 UTC
Message-ID: <CAPig+cQLRDJY_9zjEu2DdZug8h9QNSUVCzDC7W65Cm=eQ-3MiQ@mail.gmail.com>
In-Reply-To: <xmqq3578924s.fsf@gitster.g>

On Tue, Feb 14, 2023 at 1:45 AM Junio C Hamano <gitster@pobox.com> wrote:

Show 20 quoted lines

> Eric Sunshine <sunshine@sunshineco.com> writes:
> > Using (presumably) valid LANG codes results in the buggy truncated
> > output, but "LANG=C" produces the correct result:
> >
> >   $ for i in C en_US fr_FR de_DE ru_RU zh_CN; do printf "$i: " &&
> > LANG=$i.UTF-8 git symbolic-ref --short HEAD; done
> >   C: 测试-加-增加-加-增加
> >   en_US: 测试-?
> >   fr_FR: 测试-?
> >   de_DE: 测试-?
> >   ru_RU: 测试-?
> >   zh_CN: 测试-?
>
> So the system cares more than just "is this a valid UTF-8 sequence?"
> but somehow knows that the given sequence is a valid Chinese and not
> valid English?  ---oh, no, zh_CN is rejected, but your earlier zh-CN
> somehow was accepted?
>
> Now, it is beyond my ability to guess what macOS is internally doing
> wrong X-<.

I don't think the earlier incorrect "zh-CN" (in which I used "-" rather than "_") was accepted. Rather, the system simply didn't recognize it, thus presumably fell back to "C" locale. The same "correct" output results from any bogus LANG value:

  $ LANG=bogus git symbolic-ref --short HEAD
  测试-加-增加-加-增加