Test suite failure in clean chroot of ArchLinux

[Letu Ren]

Hi!

I just rebuilt the coreutils package of ArchLinux and the package
failed to build due to one failure of the gnulib test suite as
follows.

FAIL: test-getlogin
===================

test-getlogin.h:51: assertion '! isatty (0)' failed
FAIL test-getlogin (exit status: 134)

There is a bug report in ArchLinux about the same issue which has been
closed because that issue should be reported to upstream. Ref:
https://bugs.archlinux.org/task/66506

I have investigated the cause of this issue. The loginuid in the clean
chroot when building packages is -1. And getlogin function of glibc
checks /proc/self/loginuid, if it is -1, then sets errno to ENXIO and
returns NULL according to
https://elixir.bootlin.com/glibc/glibc-2.35/source/sysdeps/unix/sysv/linux/getlogin_r.c#L61
. In tests/test-getlogin.h, test_getlogin_result asserts stdin is not
a tty, which makes the test fail. I wonder whether we can enhance the
tests to skip if loginuid is -1.

I found a related bug report #27640 which is marked as resolved,
however that doesn't solve my problem.

I would like to provide any essential information to help solve this issue.

Thanks
Letu Ren