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[bug#49252] [PATCH] Channels defaulting to HEAD instead of ‘master’
From: |
Kyle Meyer |
Subject: |
[bug#49252] [PATCH] Channels defaulting to HEAD instead of ‘master’ |
Date: |
Thu, 08 Jul 2021 20:38:45 -0400 |
Ludovic Courtès writes:
> For the record, commit cb41c15827a2e910aa56fb5d1917ba8a085c95c7 by Kyle
> (Cc’d) gives the ability to use the remote HEAD by default, which is
> exactly what we need here.
>
> Unfortunately, for the Guix repo at Savannah, I get:
>
> --8<---------------cut here---------------start------------->8---
> $ ./pre-inst-env guix time-machine -- describe
> guix time-machine: error: Git error: reference 'refs/remotes/origin/HEAD' not
> found
> --8<---------------cut here---------------end--------------->8---
>
> … but it works for <https://github.com/guix-mirror/guix>.
>
> Presumably we have a server-side setup issue at Savannah?
Hmm, it looks like it's there:
$ git ls-remote https://git.savannah.gnu.org/git/guix.git | grep HEAD
e499500730de23fd54ae63696a725d4b90a406d7 HEAD
$ git clone https://git.savannah.gnu.org/git/guix.git && cd guix
$ git for-each-ref refs/remotes/origin | grep HEAD
e499500730de23fd54ae63696a725d4b90a406d7 commit refs/remotes/origin/HEAD
$ git name-rev refs/remotes/origin/HEAD
refs/remotes/origin/HEAD master
This might be a long shot, but if you cloned the repo with magit-clone,
it has some custom logic that deletes refs/remotes/<remote>/HEAD unless
magit-clone-set-remote-head is non-nil (and it's nil by default).
> Are there downsides, or cases where it might pick the wrong branch?
The main downside I can think of is what I mentioned in bug#45187
(87v9d8dk0r.fsf@kyleam.com):
[The remote HEAD symref] probably the best indicator of what the
primary branch is. In a clone, it doesn't necessarily match HEAD on
the remote, because users may change it to another branch they're
interested in, but that isn't really relevant to these
behind-the-scenes checkouts.
So, if it's a user-facing clone, refs/remotes/origin/HEAD isn't a
reliable indicator because users are free to redirect the remote HEAD
symref to another branch of interest [*] or to delete it altogether.
I think channel clones would fall into the "behind the scenes" category,
though, right?
[*] This is discussed here:
https://lore.kernel.org/git/xmqqlfivwvtw.fsf@gitster.c.googlers.com/
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Kyle Meyer <=