Sort input file list

[bmwiedemann]

Sort input file list
so that /usr/lib/systemd/tests/unit-tests/test-libsystemd-sym builds in a reproducible way
in spite of non-deterministic filesystem readdir order.

See https://reproducible-builds.org/ for why this is good.

This patch was done while working on reproducible builds for openSUSE.

[bluca]

There's one more arm-specific reproducibility problem, does your infra test on that architecture too?

[bluca]

There's one more arm-specific reproducibility problem, does your infra test on that architecture too?

Specifically: https://tests.reproducible-builds.org/debian/rb-pkg/unstable/armhf/diffoscope-results/systemd.html

somehow, arm_fadvise64_64 shows up in the second build armhf build of libsystemd-shared-255.so and I have no clue why or how

[bmwiedemann]

I did not test ARM so far because I don't have the hardware available to build. I'm running a test for openSUSE/armv7l systemd with qemu emulation atm.

[bluca]

Seems like we figured it out, it's a problem in the handling of the kernel architecture in src/shared/generate-syscall-list.py

[bmwiedemann]

My tests already gave me two bit-identical rpms for armv7l (with reduced non-determinism).

It is good that you found the source.

[bluca]

Thanks for checking! The issue I had was because one of the armv7 builds was done on an arm64 kernel, so it threw the script off balance