git-svn: allow SVN:: lib users to track the root of the repository (again)

diff --git a/tree-diff.c b/tree-diff.c
index 916f489c5b79e04035f96dd9f667f70efedb83fa..37d235e06e2cbfbd761fd02d7e73648a14a60daf 100644 (file)
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -39,8 +39,7 @@ static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, const
                show_entry(opt, "+", t2, base);
                return 1;
        }
-       if (!opt->find_copies_harder &&
-           !memcmp(sha1, sha2, 20) && mode1 == mode2)
+       if (!opt->find_copies_harder && !hashcmp(sha1, sha2) && mode1 == mode2)
                return 0;
 
        /*
@@ -216,6 +215,24 @@ int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const cha
        return retval;
 }
 
+int diff_root_tree_sha1(const unsigned char *new, const char *base, struct diff_options *opt)
+{
+       int retval;
+       void *tree;
+       struct tree_desc empty, real;
+
+       tree = read_object_with_reference(new, tree_type, &real.size, NULL);
+       if (!tree)
+               die("unable to read root tree (%s)", sha1_to_hex(new));
+       real.buf = tree;
+
+       empty.size = 0;
+       empty.buf = "";
+       retval = diff_tree(&empty, &real, base, opt);
+       free(tree);
+       return retval;
+}
+
 static int count_paths(const char **paths)
 {
        int i = 0;