bundle verify: error out if called without an object database

The deal with bundles is: they really are thin packs, with very little
sugar on top. So we really need a repository (or more appropriately, an
object database) to work with, when asked to verify a bundle.

Let's error out with a useful error message if `git bundle verify` is
called without such an object database to work with.

Reported by Konstantin Ryabitsev.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/bundle.c b/bundle.c
index b45666c49b..b5d21cd80f 100644
--- a/bundle.c
+++ b/bundle.c
@@ -142,6 +142,9 @@ int verify_bundle(struct repository *r,
 	int i, ret = 0, req_nr;
 	const char *message = _("Repository lacks these prerequisite commits:");
 
+	if (!r || !r->objects || !r->objects->odb)
+		return error(_("need a repository to verify a bundle"));
+
 	repo_init_revisions(r, &revs, NULL);
 	for (i = 0; i < p->nr; i++) {
 		struct ref_list_entry *e = p->list + i;