Fix read-tree merging more than 3 trees using 3-way merge

diff --git a/reachable.c b/reachable.c
index ff3dd34962ec69320a67a4823b844755ebfe0e7d..6383401e2dd6bef3251a105ac136312dfdcdeb3c 100644 (file)
--- a/reachable.c
+++ b/reachable.c
@@ -21,6 +21,14 @@ static void process_blob(struct blob *blob,
        /* Nothing to do, really .. The blob lookup was the important part */
 }
 
+static void process_gitlink(const unsigned char *sha1,
+                           struct object_array *p,
+                           struct name_path *path,
+                           const char *name)
+{
+       /* I don't think we want to recurse into this, really. */
+}
+
 static void process_tree(struct tree *tree,
                         struct object_array *p,
                         struct name_path *path,
@@ -47,6 +55,8 @@ static void process_tree(struct tree *tree,
        while (tree_entry(&desc, &entry)) {
                if (S_ISDIR(entry.mode))
                        process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
+               else if (S_ISGITLINK(entry.mode))
+                       process_gitlink(entry.sha1, p, &me, entry.path);
                else
                        process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
        }
@@ -159,6 +169,16 @@ static void add_cache_refs(struct rev_info *revs)
 
        read_cache();
        for (i = 0; i < active_nr; i++) {
+               /*
+                * The index can contain blobs and GITLINKs, GITLINKs are hashes
+                * that don't actually point to objects in the repository, it's
+                * almost guaranteed that they are NOT blobs, so we don't call
+                * lookup_blob() on them, to avoid populating the hash table
+                * with invalid information
+                */
+               if (S_ISGITLINK(ntohl(active_cache[i]->ce_mode)))
+                       continue;
+
                lookup_blob(active_cache[i]->sha1);
                /*
                 * We could add the blobs to the pending list, but quite