[PATCH] vc-git-revert: Execute commands from FILE's `vc-git-root'.

[Dominique Quatravaux <domq@google.com>]

"git checkout -q --" only works from a directory that is in the same Git
repository as the target file. `vc-git-command' runs the command from
buffer *vc*, in which the `default-directory' may be unsuitable depending
on the circumstances in which *vc* was created.
---
 lisp/vc/vc-git.el |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/lisp/vc/vc-git.el b/lisp/vc/vc-git.el
index 08b48fa..5683cab 100644
--- a/lisp/vc/vc-git.el
+++ b/lisp/vc/vc-git.el
@@ -677,10 +677,12 @@ It is based on `log-edit-mode', and has Git-specific extensions.")
 
 (defun vc-git-revert (file &optional contents-done)
   "Revert FILE to the version stored in the git repository."
-  (if contents-done
-      (vc-git-command nil 0 file "update-index" "--")
-    (vc-git-command nil 0 file "reset" "-q" "--")
-    (vc-git-command nil nil file "checkout" "-q" "--")))
+  (with-temp-buffer
+    (cd (vc-git-root file))
+    (if contents-done
+        (vc-git-command (current-buffer) 0 file "update-index" "--")
+      (vc-git-command (current-buffer) 0 file "reset" "-q" "--")
+      (vc-git-command (current-buffer) nil file "checkout" "-q" "--"))))
 
 (defvar vc-git-error-regexp-alist
   '(("^ \\(.+\\) |" 1 nil nil 0))
-- 
1.7.7.3