bug#41908: guix time-machine fails; XXXX is not related to introductory commit of channel 'guix'

[Marius Bakke <marius@gnu.org>]

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Ludovic Courtès <ludo@gnu.org> writes:

> Hi,
>
> (+Cc: Marius.)
>
> Jan Nieuwenhuizen <janneke@gnu.org> skribis:
>
>> $ guix pull --commit=559491ea5b36b89b2a2f9d48dacf6a2d7e219910
>> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
>> Building from this channel:
>>   guix      https://git.savannah.gnu.org/git/guix.git	559491e
>> [...]
>> hint: Run `guix pull --news' to read all the news.
>>
>> 11:23:19 janneke@dundal:~/src/guix/master
>> $ guix time-machine --commit=36640207c9543e48cd6daa92930f023f80065a5d -- environment hello
>> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
>> guix time-machine: error: '36640207c9543e48cd6daa92930f023f80065a5d' is not related to introductory commit of channel 'guix'
>>
>> [1]11:23:25 janneke@dundal:~/src/guix/master
>> git log --pretty=oneline | grep 36640207c9543e48cd6daa92930f023f80065a5d
>> 36640207c9543e48cd6daa92930f023f80065a5d quirks: Build 'compute-guix-derivation' modules with 2.2 when needed.
>
> I think ‘commit-relation’ is right: the two commits are unrelated.
>
> AIUI, commit 36640207c9543e48cd6daa92930f023f80065a5d was made on master
> (May 29) after commit 9edb3f66fd807b096b48283debdcddccfea34bad (May
> 26).  Thus, they really existed in different branches, and they’re
> unrelated.
>
> So we probably need to choose another introductory commit, one on
> ‘master’, and that has to be the merge commit for ‘staging’
> (8ab70bae52f8d4b6356ec3b8a88cebf9debe8520, June 13!).
>
> That sucks because that means that any branch forked before that is not
> mergeable.  That includes at least ‘core-updates’ (but there are few
> commits there, so it can be rebased, I think.)
>
> I don’t think we can relax the relation check with the introductory
> commit or we’d allow jumping anywhere.
>
> Thoughts?

Uff, sorry for the incomplete 'staging' rebase.  I did not realize that
.guix-authorizations was missing completely in the earlier commits of
that branch; I only focused on getting Brice's commit authorized.

Yes core-updates needs to be rebased too because of this.  And yes, not
a lot of commits yet.  So let's move the introductory commit and rebase
core-updates on top, I can take care of the latter in a few days.

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