git-daemon: rewrite kindergarden, new option --max-connections

diff --git a/read-cache.c b/read-cache.c
index 1cae361c6c3066e0aedba7872ebda3766aa94a52..2c03ec3069decb20f7557af4ac7dbe295f2dcf9c 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -147,7 +147,7 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st)
                break;
        case S_IFDIR:
                if (S_ISGITLINK(ce->ce_mode))
-                       return 0;
+                       return ce_compare_gitlink(ce) ? DATA_CHANGED : 0;
        default:
                return TYPE_CHANGED;
        }
@@ -187,6 +187,7 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
                        changed |= TYPE_CHANGED;
                break;
        case S_IFGITLINK:
+               /* We ignore most of the st_xxx fields for gitlinks */
                if (!S_ISDIR(st->st_mode))
                        changed |= TYPE_CHANGED;
                else if (ce_compare_gitlink(ce))
@@ -293,11 +294,22 @@ int ie_modified(const struct index_state *istate,
        if (changed & (MODE_CHANGED | TYPE_CHANGED))
                return changed;
 
-       /* Immediately after read-tree or update-index --cacheinfo,
-        * the length field is zero.  For other cases the ce_size
-        * should match the SHA1 recorded in the index entry.
+       /*
+        * Immediately after read-tree or update-index --cacheinfo,
+        * the length field is zero, as we have never even read the
+        * lstat(2) information once, and we cannot trust DATA_CHANGED
+        * returned by ie_match_stat() which in turn was returned by
+        * ce_match_stat_basic() to signal that the filesize of the
+        * blob changed.  We have to actually go to the filesystem to
+        * see if the contents match, and if so, should answer "unchanged".
+        *
+        * The logic does not apply to gitlinks, as ce_match_stat_basic()
+        * already has checked the actual HEAD from the filesystem in the
+        * subproject.  If ie_match_stat() already said it is different,
+        * then we know it is.
         */
-       if ((changed & DATA_CHANGED) && ce->ce_size != 0)
+       if ((changed & DATA_CHANGED) &&
+           (S_ISGITLINK(ce->ce_mode) || ce->ce_size != 0))
                return changed;
 
        changed_fs = ce_modified_check_fs(ce, st);
@@ -1326,6 +1338,11 @@ static void ce_smudge_racily_clean_entry(struct cache_entry *ce)
         * falsely clean entry due to touch-update-touch race, so we leave
         * everything else as they are.  We are called for entries whose
         * ce_mtime match the index file mtime.
+        *
+        * Note that this actually does not do much for gitlinks, for
+        * which ce_match_stat_basic() always goes to the actual
+        * contents.  The caller checks with is_racy_timestamp() which
+        * always says "no" for gitlinks, so we are not called for them ;-)
         */
        struct stat st;