Do not write out new index if nothing has changed.

The git-update-cache command, especially with --refresh, may not change
anything.  In such a case, writing 1.6MB of the same thing is a waste.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/update-cache.c b/update-cache.c
index 05d584e..893ba86 100644 (file)
--- a/update-cache.c
+++ b/update-cache.c
@@ -15,6 +15,12 @@
  */
 static int allow_add = 0, allow_remove = 0, not_new = 0;
 
+/*
+ * update-cache --refresh may not touch anything at all, in which case
+ * writing 1.6MB of the same thing is a waste.
+ */
+static int cache_changed = 0;
+
 /* Three functions to allow overloaded pointer return; see linux/err.h */
 static inline void *ERR_PTR(long error)
 {
@@ -51,7 +57,7 @@ static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
        ce->ce_size = htonl(st->st_size);
 }
 
-static int add_file_to_cache(char *path)
+static int add_file_to_cache_1(char *path)
 {
        int size, namelen;
        struct cache_entry *ce;
@@ -93,9 +99,35 @@ static int add_file_to_cache(char *path)
        default:
                return -1;
        }
+       if (!cache_changed) {
+               /* If we have not smudged the cache, be careful
+                * to keep it clean.  Find out if we have a matching
+                * cache entry that add_cache_entry would replace with,
+                * and if it matches then do not bother calling it.
+                */
+               int pos = cache_name_pos(ce->name, namelen);
+               if ((0 <= pos) &&
+                   !memcmp(active_cache[pos], ce, sizeof(*ce))) {
+                       free(ce);
+                       /* magic to tell add_file_to_cache that
+                        * we have not updated anything.
+                        */
+                       return 999;
+               }
+       }
        return add_cache_entry(ce, allow_add);
 }
 
+static int add_file_to_cache(char *path)
+{
+       int ret = add_file_to_cache_1(path);
+       if (ret == 0)
+               cache_changed = 1;
+       else if (ret == 999)
+               ret = 0;
+       return ret;
+}
+
 static int match_data(int fd, void *buffer, unsigned long size)
 {
        while (size) {
@@ -165,6 +197,7 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce)
        if (compare_data(ce, st.st_size))
                return ERR_PTR(-EINVAL);
 
+       cache_changed = 1;
        size = ce_size(ce);
        updated = xmalloc(size);
        memcpy(updated, ce, size);
@@ -245,6 +278,7 @@ static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
        if (!verify_path(arg3))
                return -1;
 
+       cache_changed = 1;
        len = strlen(arg3);
        size = cache_entry_size(len);
        ce = xmalloc(size);
@@ -339,9 +373,13 @@ int main(int argc, char **argv)
                if (add_file_to_cache(path))
                        die("Unable to add %s to database", path);
        }
-       if (write_cache(newfd, active_cache, active_nr) || rename(lockfile, indexfile))
+
+       if (!cache_changed)
+               unlink(lockfile);
+       else if (write_cache(newfd, active_cache, active_nr) ||
+                rename(lockfile, indexfile))
                die("Unable to write new cachefile");
 
        lockfile_name = NULL;
-       return has_errors;
+       return has_errors ? 1 : 0;
 }