diff/status: refactor opportunistic index update

When we had to refresh the index internally before running diff or status,
we opportunistically updated the $GIT_INDEX_FILE so that later invocation
of git can use the lstat(2) we already did in this invocation.

Make them share a helper function to do so.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/commit.c b/builtin/commit.c
index 66fdd2202495b2893c79b4f92b0fc2e715f5b7bb..0b6ce2fa3757b0d052ee28d716687a70e1c4ca37 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1090,13 +1090,8 @@ int cmd_status(int argc, const char **argv, const char *prefix)
        refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, s.pathspec, NULL, NULL);
 
        fd = hold_locked_index(&index_lock, 0);
-       if (0 <= fd) {
-               if (active_cache_changed &&
-                   !write_cache(fd, active_cache, active_nr))
-                       commit_locked_index(&index_lock);
-               else
-                       rollback_lock_file(&index_lock);
-       }
+       if (0 <= fd)
+               update_index_if_able(&the_index, &index_lock);
 
        s.is_initial = get_sha1(s.reference, sha1) ? 1 : 0;
        s.in_merge = in_merge;

diff --git a/builtin/diff.c b/builtin/diff.c
index a43d3263638daf083c52f37f3bd0872327d7459b..bab4bd9f57af2ad663c962fde33fa6934f7518b2 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -197,12 +197,7 @@ static void refresh_index_quietly(void)
        discard_cache();
        read_cache();
        refresh_cache(REFRESH_QUIET|REFRESH_UNMERGED);
-
-       if (active_cache_changed &&
-           !write_cache(fd, active_cache, active_nr))
-               commit_locked_index(lock_file);
-
-       rollback_lock_file(lock_file);
+       update_index_if_able(&the_index, lock_file);
 }
 
 static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv)

diff --git a/cache.h b/cache.h
index 2ef2fa3a5e166d94e5e981ca7c76afad13236e7e..9a3cc8ef1a0473287f238f66da3005be96a27ab1 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -520,6 +520,7 @@ extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 extern int commit_lock_file(struct lock_file *);
+extern void update_index_if_able(struct index_state *, struct lock_file *);
 
 extern int hold_locked_index(struct lock_file *, int);
 extern int commit_locked_index(struct lock_file *);

diff --git a/read-cache.c b/read-cache.c
index 1f42473e8070a05ada8c56b0d60537227a5223ec..7a0421cba47bf370ac3d6ef560da60ecb6c36b21 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -1545,6 +1545,18 @@ static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce)
        return result;
 }
 
+/*
+ * Opportunisticly update the index but do not complain if we can't
+ */
+void update_index_if_able(struct index_state *istate, struct lock_file *lockfile)
+{
+       if (istate->cache_changed &&
+           !write_index(istate, lockfile->fd))
+               commit_locked_index(lockfile);
+       else
+               rollback_lock_file(lockfile);
+}
+
 int write_index(struct index_state *istate, int newfd)
 {
        git_SHA_CTX c;