git-http-fetch needs $(X)

diff --git a/read-tree.c b/read-tree.c
index 6a5c08c4c6903fec45cbe37a63f0bc42fbae53bc..ca808739dba4235f0f8a5777ff4bbfe4443d1d27 100644 (file)
--- a/read-tree.c
+++ b/read-tree.c
@@ -655,7 +655,7 @@ int main(int argc, char **argv)
                        die("failed to unpack tree object %s", arg);
                stage++;
        }
-       if (update && !merge)
+       if ((update||index_only) && !merge)
                usage(read_tree_usage);
        if (merge && !fn) {
                if (stage < 2)