Merge branch 'kw/commit-keep-index-when-pre-commit-is-not-run'

"git commit" used to discard the index and re-read from the filesystem
just in case the pre-commit hook has updated it in the middle; this
has been optimized out when we know we do not run the pre-commit hook.

* kw/commit-keep-index-when-pre-commit-is-not-run:
commit: skip discarding the index if there is no pre-commit hook

diff --git a/builtin/commit.c b/builtin/commit.c
index e7a2cb628554c7db3370521521291a28b060f574..b79bcfd5b9331f79b660940bb4029aa96041d80e 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -940,13 +940,16 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                return 0;
        }
 
-       /*
-        * Re-read the index as pre-commit hook could have updated it,
-        * and write it out as a tree.  We must do this before we invoke
-        * the editor and after we invoke run_status above.
-        */
-       discard_cache();
+       if (!no_verify && find_hook("pre-commit")) {
+               /*
+                * Re-read the index as pre-commit hook could have updated it,
+                * and write it out as a tree.  We must do this before we invoke
+                * the editor and after we invoke run_status above.
+                */
+               discard_cache();
+       }
        read_cache_from(index_file);
+
        if (update_main_cache_tree(0)) {
                error(_("Error building trees"));
                return 0;