Add post-merge hook, related documentation, and tests.

diff --git a/reachable.c b/reachable.c
index a6a334822a91f7325399740b0aa05e95f6fb4a70..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,
@@ -42,12 +50,13 @@ static void process_tree(struct tree *tree,
        me.elem = name;
        me.elem_len = strlen(name);
 
-       desc.buf = tree->buffer;
-       desc.size = tree->size;
+       init_tree_desc(&desc, tree->buffer, tree->size);
 
        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);
        }
@@ -160,6 +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
@@ -188,9 +207,9 @@ void mark_reachable_objects(struct rev_info *revs, int mark_reflog)
        /* Add all external refs */
        for_each_ref(add_one_ref, revs);
 
-       /* Add all reflog info from refs */
+       /* Add all reflog info */
        if (mark_reflog)
-               for_each_ref(add_one_reflog, revs);
+               for_each_reflog(add_one_reflog, revs);
 
        /*
         * Set up the revision walk - this will move all commits