On 2021-01-07, Vagrant Cascadian wrote: > On 2021-01-07, Michael Biebl wrote: >> Am 07.01.21 um 18:24 schrieb Michael Biebl: >>> as can be seen at [1], systemd does not build reproducibly on armhf and >>> arm64 (while there is no problem on amd64 and i386). >>> >>> The problem is, I have no idea what the diffoscope diff [2] means and >>> how I can make the package build reproducibly everywhere or how I can >>> further investigate this. >>> >>> Any help here is greatly appreciated as I think reproducible-builds are >>> a great effort and I'd like to support that as much as I can. >>> >>> Regards, >>> Michael >>> >>> >>> [1] >>> https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/systemd.html >>> [2] >>> https://tests.reproducible-builds.org/debian/rb-pkg/unstable/arm64/diffoscope-results/systemd.html > > My best wild guesses would be parallelism, filesystem ordering or locale > differences causing various sort ordering differences. > > I'm running a local build on arm64 with "reprotest --auto-build" to see > if it can help give us any better leads, will see if that shows anything > more useful... it could take some time on not particularly fast > hardware.
First attempt was reproducible for me (two normalized builds and one varied build), though I couldn't vary the clock with reprotest (libfaketime appears to trigger issues with building systemd)... or fileordering, user, group or hostname due to some limitations my my typical test environment. The command I ran was: reprotest --verbose --min-cpus=1 --vary=-user_group,-domain_host,-fileordering,-time auto -- null So maybe one of those disabled variations, but all those are also varied on all the platforms that tests.reproducible-builds.org tests for Debian, so... hrm. Another possibility is the locale used... reprotest picks more or less at random, while: https://tests.reproducible-builds.org/debian/index_variations.html amd64: LANG="et_EE.UTF-8" i386: LANG="de_CH.UTF-8" arm64: LANG="nl_BE.UTF-8" armhf: LANG="it_CH.UTF-8" Similar for LC_ALL and LANGUAGE. But I somewhat doubt both nl_BE and it_CH would break in the same way... The other thing that's maybe a bit different is parallelism: XXX on amd64: 16 or 15 XXX on i386: 10 or 9 XXX on armhf: 5 or 3 But the difference between 3-5 cores and 9-10 or 15-16 doesn't seem very likely to trigger issues either... Was hoping reprotest would at least point us in a clearer direction for what to test for ... but not today. I'll chew on it a bit more and possibly try to stir up some more possibilities. live well, vagrant
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