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bug#23769: 25.0.95; Mode Line breakage in vc-git

From: Phillip Lord
Subject: bug#23769: 25.0.95; Mode Line breakage in vc-git
Date: Wed, 15 Jun 2016 21:48:29 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.95 (gnu/linux)

Dmitry Gutov <address@hidden> writes:

> On 06/14/2016 08:03 PM, Phillip Lord wrote:
>>> AFAIK Emacs doesn't support GIT_DIR, see eg https://debbugs.gnu.org/5344 .
>> There's a patch attached that Bug report which never seems to have been
>> applied.
> Have you tried it? Does it fix your problem?

The following patch addresses this bug.

John/Eli would you want this for Emacs-25.

I've noticed from instrumenting vc-git that it's not just the
symbolic-ref command that returns 128, but several others. So, it might
be that the best long term solution would be to make change vc-git--call
to set the default directory to the root, which would make GIT_DIR=.git
always correct.

At the moment, though, I've noticed some git commands are called with
simple file names, and some full, so this would probably require more
changes. No sense in making this sort of change for Emacs-25 now.

>From 0419734fd39f8cd67472c0294295ef1508e39d85 Mon Sep 17 00:00:00 2001
From: Phillip Lord <address@hidden>
Date: Wed, 15 Jun 2016 17:36:42 +0100
Subject: [PATCH] Fix error from vc-git when GIT_DIR is set

* lisp/vc/vc-git.el (vc-git-working-revision): Set default-directory to
  repository root to prevent an error when GIT_DIR is relative to it.
* test/automated/vc-git-tests.el: New file.

Addresses Bug#23769
 lisp/vc/vc-git.el              |  8 ++++--
 test/automated/vc-git-tests.el | 60 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 2 deletions(-)
 create mode 100644 test/automated/vc-git-tests.el

diff --git a/lisp/vc/vc-git.el b/lisp/vc/vc-git.el
index f35c84d..ea26a7d 100644
--- a/lisp/vc/vc-git.el
+++ b/lisp/vc/vc-git.el
@@ -260,9 +260,13 @@ vc-git-state
             (vc-git--state-code diff-letter)))
       (if (vc-git--empty-db-p) 'added 'up-to-date))))
-(defun vc-git-working-revision (_file)
+(defun vc-git-working-revision (file)
   "Git-specific version of `vc-working-revision'."
-  (let (process-file-side-effects)
+  ;; Call this in the root directory, or Emacs may error when setting
+  ;; the modeline when called from a git pre-commit hook, which sets
+  ;; GIT_DIR. (Bug #23769)
+  (let ((default-directory (vc-git-root file))
+        (process-file-side-effects))
     (vc-git--rev-parse "HEAD")))
 (defun vc-git--symbolic-ref (file)
diff --git a/test/automated/vc-git-tests.el b/test/automated/vc-git-tests.el
new file mode 100644
index 0000000..8001bcb
--- /dev/null
+++ b/test/automated/vc-git-tests.el
@@ -0,0 +1,60 @@
+;;; vc-git-tests.el --- tests for vc/vc-git.el
+;; Copyright (C) 2016 Free Software Foundation, Inc.
+;; This file is part of GNU Emacs.
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; GNU General Public License for more details.
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;;; Commentary:
+;;; Code:
+(require 'ert)
+(require 'vc-git)
+;; This will break when merged from the emacs-25 branch to master,
+;; because of the change of directory structure. The actual file is
+;; not important at all, so long as it is checked into git.
+(defvar vc-git-tests-file
+  (concat
+   (expand-file-name
+    "data/xref/"
+    (file-name-directory (or load-file-name (buffer-file-name))))
+   "file1.txt"))
+(ert-deftest open-this-file ()
+  "Test for Bug #23769."
+  (should
+   (let ((git-dir (getenv "GIT_DIR")))
+     (unwind-protect
+         (progn
+           (setenv "GIT_DIR" nil)
+           (find-file vc-git-tests-file))
+       (when (get-file-buffer vc-git-tests-file)
+         (setenv "GIT_DIR" git-dir)
+         (kill-buffer (get-file-buffer vc-git-tests-file))))))
+  (should
+   (let ((git-dir (getenv "GIT_DIR")))
+     (unwind-protect
+         (progn
+           (setenv "GIT_DIR" ".git")
+           (find-file vc-git-tests-file))
+       (when (get-file-buffer vc-git-tests-file)
+         (setenv "GIT_DIR" git-dir)
+         (kill-buffer (get-file-buffer vc-git-tests-file)))))))
+;;; vc-git-tests.el ends here

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