if SOURCE_DATE_EPOCH is set, don't randomize the testsuite

[asottile]

Feature or enhancement

Proposal:

cc @vstinner from #109570 (comment)

cc @doko42 @stefanor from debian -- this would allow debian to remove this patch I believe https://salsa.debian.org/cpython-team/python3/-/blob/master/debian/patches/test-no-random-order.diff

if SOURCE_DATE_EPOCH is set test randomization should be disabled

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

#109570 (comment)

Linked PRs

• gh-110164: regrtest disables random if SOURCE_DATE_EPOCH #110168

[vstinner]

Would you be able to test if my PR gh-110168 fix your issue?

[vstinner]

My PR doesn't check SOURCE_DATE_EPOCH value. It only checks if the variable is defined.

[asottile]

@vstinner works great -- thanks!

[vstinner]

Merged, thanks for the test @asottile.

[encukou]

The feature breaks tests, see: #110932
If we are to maintain this case, it should probably have a buildbot.

[vstinner]

If we are to maintain this case, it should probably have a buildbot.

I don't think that a whole buildbot is needed. Just additional tests.