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

When I check out one particular branch of my gdb repository, vc-dir
fails with this error:

vc-do-command: Failed (status 2): git --no-pager remote get-url . .

The only thing that might be peculiar about this branch is that it uses
another local branch as its tracking branch.

If I check out other branches in this repository -- ones that track
remote branches -- vc-dir works again.



In GNU Emacs 28.3 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.38, cairo version 1.17.8)
 of 2023-09-23 built on fd97b702fbea4aa3b70f5e90b3f3f165
Windowing system distributor 'The X.Org Foundation', version 11.0.12201009
System Description: Fedora Linux 38 (Workstation Edition)

Configured using:
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Memory information:
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Tom Tromey <tom@HIDDEN>
Subject: bug#68183: Acknowledgement (28.3; vc-dir fails when I have a
 certain branch checked out)
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Subject: bug#68183: 28.3; vc-dir fails when I have a certain branch checked out
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Tom Tromey <tom@HIDDEN>
Cc: 68183 <at> debbugs.gnu.org
Date: Sun, 31 Dec 2023 21:34:27 +0200
Message-Id: <83y1da17zw.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <8734vici68.fsf@HIDDEN> (message from Tom Tromey on Sun, 31
 Dec 2023 11:59:11 -0700)
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> From: Tom Tromey <tom@HIDDEN>
> Date: Sun, 31 Dec 2023 11:59:11 -0700
> 
> 
> I use vc-dir frequently.
> 
> When I check out one particular branch of my gdb repository, vc-dir
> fails with this error:
> 
> vc-do-command: Failed (status 2): git --no-pager remote get-url . .
> 
> The only thing that might be peculiar about this branch is that it uses
> another local branch as its tracking branch.
> 
> If I check out other branches in this repository -- ones that track
> remote branches -- vc-dir works again.

Thanks, but I think we'd appreciate a reproducible recipe for this:
how can one create a Git repository which can be used to reproduce
this issue?

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#68183: 28.3; vc-dir fails when I have a certain branch checked out
Resent-From: Tom Tromey <tom@HIDDEN>
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To: Eli Zaretskii <eliz@HIDDEN>
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From: Tom Tromey <tom@HIDDEN>
References: <8734vici68.fsf@HIDDEN> <83y1da17zw.fsf@HIDDEN>
Date: Sun, 31 Dec 2023 13:14:42 -0700
In-Reply-To: <83y1da17zw.fsf@HIDDEN> (Eli Zaretskii's message of "Sun, 31 Dec
 2023 21:34:27 +0200")
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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.

Tom

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Tom Tromey <tom@HIDDEN> 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.

I can reproduce; IIUC the salient point is setting start-point to a
local revision when calling git checkout, by opposition to
e.g. origin/master.  Continuing off of your recipe:

$ git branch --set-upstream-to origin/master

Then M-x vc-dir works again.

IIUC, to display

  Remote     : https://git.savannah.gnu.org/git/emacs.git

vc-git-dir-extra-headers runs

1. git config branch.vc-dir-bug.remote =E2=87=92 "."
2. (vc-git-repository-url "[=E2=80=A6 EMACS DIR =E2=80=A6]" ".")
    1. git config remote...url =E2=87=92 error

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?

(1) Drop the "Remote" header: the current branch is not sync'd with a
remote branch, after all.

(2) Print "Remote: https://git.savannah.gnu.org/git/emacs.git" by making
vc-git-repository-url fall back to remote.origin.url when remote-name is
".".

(3) Print "Remote: master" by making vc-git-dir-extra-headers fall back
to branch.<name>.merge when .remote is ".".

(4) Make vc-git-dir-extra-headers fall back to
branch.<branch.<name>.merge>.remote.  In our example, that would yield
"Remote: https://git.savannah.gnu.org/git/emacs.git", but in general
that seems unreliable, since that remote could be "." as well, and
nothing prevents cycles AFAIU.

IMO (3) would be the most robust, though maybe confusing (calling a
local branch "remote"); (2) makes sense as well since
vc-git-repository-url already falls back to remote.origin.url when
remote-name is nil.

(1) sounds trivially "robust" and "not too incorrect", but maybe not the
most helpful.  (4) is under-specified and I'm not convinced it is
possible to make it generally useful.


Hope I've not mis-diagnosed the problem; apologies for the noise if so.

Last modified: Sat, 20 Jan 2024 12:30:02 UTC

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