[tor-project] gitolite email hook replacement

[Antoine Beaupré]

Hi,

As part of the procmail retirement I announce on March 1st, the email
notification hook used by the old Gitolite server to notify users of new
patches started breaking in odd and unpredictable ways:

https://gitlab.torproject.org/tpo/tpa/team/-/issues/40653
https://gitlab.torproject.org/tpo/tpa/team/-/issues/40659

I have tried to fix this by deploying `reformail` as a `formail`
replacement, but that ultimately failed as well. In the end, I deployed
a newer mailing hook called "git-multimail":

https://github.com/git-multimail/git-multimail

After a brief test period inside TPA, all repositories have been
switched over to the new hook today. You might notice a different email
template. It's also possible you receive more email than before.

If there's any significant problem with the new hook, do let us know in
the usual place:

https://gitlab.torproject.org/tpo/tpa/team/-/wikis/support

There is no clear list of changes since the last hook, because the hook
we were using was an in-house version with no corresponding upstream
version. That said, it was fairly similar to the defunct
`post-receive-email` hook, and there *is* a list of differences between
git-multimail and that, which you can read here:

https://github.com/git-multimail/git-multimail/blob/master/git-multimail/README.migrate-from-post-receive-email

That's about it, thank you for your attention and have a nice day,

a.

-- 
Antoine Beaupré
torproject.org system administration
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