submodule: check for NULL return of get_submodule_ref_store()

If we can't find a ref store for a submodule then assume the latter
is not initialized (or was removed).  Print a status line accordingly
instead of causing a segmentation fault by passing NULL as the first
parameter of refs_head_ref().

Reported-by: Jeremy Feusi <jeremy@feusi.co>
Reviewed-by: Stefan Beller <sbeller@google.com>
Initial-Test-By: Stefan Beller <sbeller@google.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index a5c4a8a6941d46c78e4dc58d0df47532f0bb2b45..901632ac29844b6bf85feb37ae691120abf9fa24 100644 (file)
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -620,9 +620,13 @@ static void status_submodule(const char *path, const struct object_id *ce_oid,
                             displaypath);
        } else if (!(flags & OPT_CACHED)) {
                struct object_id oid;
+               struct ref_store *refs = get_submodule_ref_store(path);
 
-               if (refs_head_ref(get_submodule_ref_store(path),
-                                 handle_submodule_head_ref, &oid))
+               if (!refs) {
+                       print_status(flags, '-', path, ce_oid, displaypath);
+                       goto cleanup;
+               }
+               if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
                        die(_("could not resolve HEAD ref inside the "
                              "submodule '%s'"), path);
 

diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index a39e69a3ebd1c39ddf8feb861f8a39c8315aa7f8..152104412f212190c18279b64e80bb9f58242d47 100755 (executable)
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -821,6 +821,21 @@ test_expect_success 'moving the superproject does not break submodules' '
        )
 '
 
+test_expect_success 'moving the submodule does not break the superproject' '
+       (
+               cd addtest2 &&
+               git submodule status
+       ) >actual &&
+       sed -e "s/^ \([^ ]* repo\) .*/-\1/" <actual >expect &&
+       mv addtest2/repo addtest2/repo.bak &&
+       test_when_finished "mv addtest2/repo.bak addtest2/repo" &&
+       (
+               cd addtest2 &&
+               git submodule status
+       ) >actual &&
+       test_cmp expect actual
+'
+
 test_expect_success 'submodule add --name allows to replace a submodule with another at the same path' '
        (
                cd addtest2 &&