post-checkout hook, tests, and docs

diff --git a/fetch.c b/fetch.c
index dda33e548b65e79e22de8a84ab4d67ef13387a05..811be87a3c1e0d14d9f2b37650d56575b49caa22 100644 (file)
--- a/fetch.c
+++ b/fetch.c
@@ -46,6 +46,9 @@ static int process_tree(struct tree *tree)
        while (tree_entry(&desc, &entry)) {
                struct object *obj = NULL;
 
+               /* submodule commits are not stored in the superproject */
+               if (S_ISGITLINK(entry.mode))
+                       continue;
                if (S_ISDIR(entry.mode)) {
                        struct tree *tree = lookup_tree(entry.sha1);
                        if (tree)