Teach 'diff' about 'diff' attribute.

diff --git a/read-cache.c b/read-cache.c
index a8f8a6b2b23cdba612db175ee86a5f0db125c245..54573ce2ee3b2c70d5419716b20ade61683bc289 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -485,6 +485,8 @@ static int has_file_name(const struct cache_entry *ce, int pos, int ok_to_replac
                        continue;
                if (p->name[len] != '/')
                        continue;
+               if (!ce_stage(p) && !p->ce_mode)
+                       continue;
                retval = -1;
                if (!ok_to_replace)
                        break;
@@ -517,26 +519,37 @@ static int has_dir_name(const struct cache_entry *ce, int pos, int ok_to_replace
 
                pos = cache_name_pos(name, ntohs(create_ce_flags(len, stage)));
                if (pos >= 0) {
-                       retval = -1;
-                       if (!ok_to_replace)
-                               break;
-                       remove_cache_entry_at(pos);
-                       continue;
+                       /*
+                        * Found one, but not so fast.  This could
+                        * be a marker that says "I was here, but
+                        * I am being removed".  Such an entry is
+                        * not a part of the resulting tree, and
+                        * it is Ok to have a directory at the same
+                        * path.
+                        */
+                       if (stage || active_cache[pos]->ce_mode) {
+                               retval = -1;
+                               if (!ok_to_replace)
+                                       break;
+                               remove_cache_entry_at(pos);
+                               continue;
+                       }
                }
+               else
+                       pos = -pos-1;
 
                /*
                 * Trivial optimization: if we find an entry that
                 * already matches the sub-directory, then we know
                 * we're ok, and we can exit.
                 */
-               pos = -pos-1;
                while (pos < active_nr) {
                        struct cache_entry *p = active_cache[pos];
                        if ((ce_namelen(p) <= len) ||
                            (p->name[len] != '/') ||
                            memcmp(p->name, name, len))
                                break; /* not our subdirectory */
-                       if (ce_stage(p) == stage)
+                       if (ce_stage(p) == stage && (stage || p->ce_mode))
                                /* p is at the same stage as our entry, and
                                 * is a subdirectory of what we are looking
                                 * at, so we cannot have conflicts at our
@@ -560,12 +573,21 @@ static int has_dir_name(const struct cache_entry *ce, int pos, int ok_to_replace
  */
 static int check_file_directory_conflict(const struct cache_entry *ce, int pos, int ok_to_replace)
 {
+       int retval;
+
+       /*
+        * When ce is an "I am going away" entry, we allow it to be added
+        */
+       if (!ce_stage(ce) && !ce->ce_mode)
+               return 0;
+
        /*
         * We check if the path is a sub-path of a subsequent pathname
         * first, since removing those will not change the position
-        * in the array
+        * in the array.
         */
-       int retval = has_file_name(ce, pos, ok_to_replace);
+       retval = has_file_name(ce, pos, ok_to_replace);
+
        /*
         * Then check if the path might have a clashing sub-directory
         * before it.