bug#68183: 28.3; vc-dir fails when I have a certain branch checked out

[Kévin Le Gouguec]

Kévin Le Gouguec <kevin.legouguec@gmail.com> writes:

> Tom Tromey <tom@tromey.com> writes:
>
>> Eli> Thanks, but I think we'd appreciate a reproducible recipe for this:
>> Eli> how can one create a Git repository which can be used to reproduce
>> Eli> this issue?
>>
>> This worked for me:
>>
>> $ cd ~/Emacs/trunk
>> # This is my Emacs git repository
>> $ git checkout --track -b vc-dir-bug master
>> branch 'vc-dir-bug' set up to track 'master'.
>> Switched to a new branch 'vc-dir-bug'
>>
>>
>> Now invoke vc-dir on that directory.
>

[…]

> git-config(1) says that branch.<name>.remote is "." when <name> is
> tracking a local branch, whereas branch.<name>.merge points to the local
> branch 'git pull' will resync with.  Wonder what TRT would be for the
> purposes of vc-dir?

Here's a patch.  tl;dr

(1) When branch.<name>.remote is ".", display…

    > Remote    : none (tracking local branch)

    … instead of raising an error.

(2) When branch.<name>.merge is set to BRANCH, display…

    > Tracking  : BRANCH

(3) Add tests, because why not.

CC'ing Dmitry and Juri, whom my brain associates with vc-git maintenance
(rightly or wrongly; apologies for the noise if the latter).

I might be slow to respond for the next couple of weeks, so please feel
free to adapt or dismiss the patch as convenient.  FWIW, off the top of
my head,

* the test should probably have a (skip-unless (have-git-or-something)),
* maybe "none (tracking local branch)" is not informative and we should
  ditch it,
  * maybe we should fall back to "origin", like vc-git-repository-url
    does,
* rushed the ChangeLog entry; vc-git-test--run should also be declared
  as a "new helper" (and maybe I should spell out that I used it to not
  have to depend on vc-git-- internal functions),
* maybe the new header deserves a NEWS entry.

I can tackle any of the above (and any other feedback), though again, if
someone has a vision and I don't answer in a timely manner, don't wait
on me.

0001-Fix-vc-dir-when-remote-Git-branch-is-local.patch
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