Re: Linking topic merges to mailing list threads

["Kristoffer Haugsbakk" <kristofferhaugsbakk@fastmail.com>]

Like Junio explained refs/notes/amlog is a hidden gem for patch
provenance.

> Hi all,
>
> We've been wanting to gather metrics on Git's code review process -
> how long it takes from first contact on list to merge, how many
> iterations are needed, time between iterations, etc. One missing link
> is the actual merge time in `next` and `master` - a human can infer
> the link between the patch and the mailing list thread, but it's more
> challenging for a script to do it.

Is the starting point the email?  I think you could fish out the
Message-ID and do a grep inside the notes tree

    git grep --fixed-string --name-only \
        '00a9fe6b7d77c16c9fd6dfe746aacf9068a76942.1726206484.git.ps@pks.im' \
        refs/notes/amlog --

(the resulting hash will need to be cleaned: fanned directory layout[1])

Then try one commit at a time (because there might be unreachable
commits from rewrite operations) using git-when-merged(1):[2]

    git when-merged --log 7cd8f1cc6e17af54fb78768c259a615b1ccc0205 next
    git when-merged --log 7cd8f1cc6e17af54fb78768c259a615b1ccc0205 master

† 1: e.g. 7c/d8/f1cc6e17af54fb78768c259a615b1ccc0205
🔗 2: https://github.com/mhagger/git-when-merged

-- 
Kristoffer Haugsbakk