Merge branch 'jt/no-abuse-alternate-odb-for-submodules'

Follow through the work to use the repo interface to access
submodule objects in-process, instead of abusing the alternate
object database interface.

* jt/no-abuse-alternate-odb-for-submodules:
  submodule: trace adding submodule ODB as alternate
  submodule: pass repo to check_has_commit()
  object-file: only register submodule ODB if needed
  merge-{ort,recursive}: remove add_submodule_odb()
  refs: peeling non-the_repository iterators is BUG
  refs: teach arbitrary repo support to iterators
  refs: plumb repo into ref stores

20 files changed, 148 insertions, 68 deletions

diff --git a/merge-ort.c b/merge-ort.c
index e5456f4722..0342f10483 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -609,6 +609,7 @@ static int err(struct merge_options *opt, const char *err, ...)
 
 static void format_commit(struct strbuf *sb,
 			  int indent,
+			  struct repository *repo,
 			  struct commit *commit)
 {
 	struct merge_remote_desc *desc;
@@ -622,7 +623,7 @@ static void format_commit(struct strbuf *sb,
 		return;
 	}
 
-	format_commit_message(commit, "%h %s", sb, &ctx);
+	repo_format_commit_message(repo, commit, "%h %s", sb, &ctx);
 	strbuf_addch(sb, '\n');
 }
 
@@ -1578,17 +1579,6 @@ static int merge_submodule(struct merge_options *opt,
 	if (is_null_oid(b))
 		return 0;
 
-	/*
-	 * NEEDSWORK: Remove this when all submodule object accesses are
-	 * through explicitly specified repositores.
-	 */
-	if (add_submodule_odb(path)) {
-		path_msg(opt, path, 0,
-			 _("Failed to merge submodule %s (not checked out)"),
-			 path);
-		return 0;
-	}
-
 	if (repo_submodule_init(&subrepo, opt->repo, path, null_oid())) {
 		path_msg(opt, path, 0,
 				_("Failed to merge submodule %s (not checked out)"),
@@ -1653,7 +1643,7 @@ static int merge_submodule(struct merge_options *opt,
 		break;
 
 	case 1:
-		format_commit(&sb, 4,
+		format_commit(&sb, 4, &subrepo,
 			      (struct commit *)merges.objects[0].item);
 		path_msg(opt, path, 0,
 			 _("Failed to merge submodule %s, but a possible merge "
@@ -1670,7 +1660,7 @@ static int merge_submodule(struct merge_options *opt,
 		break;
 	default:
 		for (i = 0; i < merges.nr; i++)
-			format_commit(&sb, 4,
+			format_commit(&sb, 4, &subrepo,
 				      (struct commit *)merges.objects[i].item);
 		path_msg(opt, path, 0,
 			 _("Failed to merge submodule %s, but multiple "
diff --git a/merge-recursive.c b/merge-recursive.c
index c553751889..d9457797db 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -334,7 +334,9 @@ static void output(struct merge_options *opt, int v, const char *fmt, ...)
 		flush_output(opt);
 }
 
-static void output_commit_title(struct merge_options *opt, struct commit *commit)
+static void repo_output_commit_title(struct merge_options *opt,
+				     struct repository *repo,
+				     struct commit *commit)
 {
 	struct merge_remote_desc *desc;
 
@@ -343,23 +345,29 @@ static void output_commit_title(struct merge_options *opt, struct commit *commit
 	if (desc)
 		strbuf_addf(&opt->obuf, "virtual %s\n", desc->name);
 	else {
-		strbuf_add_unique_abbrev(&opt->obuf, &commit->object.oid,
-					 DEFAULT_ABBREV);
+		strbuf_repo_add_unique_abbrev(&opt->obuf, repo,
+					      &commit->object.oid,
+					      DEFAULT_ABBREV);
 		strbuf_addch(&opt->obuf, ' ');
-		if (parse_commit(commit) != 0)
+		if (repo_parse_commit(repo, commit) != 0)
 			strbuf_addstr(&opt->obuf, _("(bad commit)\n"));
 		else {
 			const char *title;
-			const char *msg = get_commit_buffer(commit, NULL);
+			const char *msg = repo_get_commit_buffer(repo, commit, NULL);
 			int len = find_commit_subject(msg, &title);
 			if (len)
 				strbuf_addf(&opt->obuf, "%.*s\n", len, title);
-			unuse_commit_buffer(commit, msg);
+			repo_unuse_commit_buffer(repo, commit, msg);
 		}
 	}
 	flush_output(opt);
 }
 
+static void output_commit_title(struct merge_options *opt, struct commit *commit)
+{
+	repo_output_commit_title(opt, the_repository, commit);
+}
+
 static int add_cacheinfo(struct merge_options *opt,
 			 const struct diff_filespec *blob,
 			 const char *path, int stage, int refresh, int options)
@@ -1152,14 +1160,14 @@ static int find_first_merges(struct repository *repo,
 	return result->nr;
 }
 
-static void print_commit(struct commit *commit)
+static void print_commit(struct repository *repo, struct commit *commit)
 {
 	struct strbuf sb = STRBUF_INIT;
 	struct pretty_print_context ctx = {0};
 	ctx.date_mode.type = DATE_NORMAL;
 	/* FIXME: Merge this with output_commit_title() */
 	assert(!merge_remote_util(commit));
-	format_commit_message(commit, " %h: %m %s", &sb, &ctx);
+	repo_format_commit_message(repo, commit, " %h: %m %s", &sb, &ctx);
 	fprintf(stderr, "%s\n", sb.buf);
 	strbuf_release(&sb);
 }
@@ -1199,15 +1207,6 @@ static int merge_submodule(struct merge_options *opt,
 	if (is_null_oid(b))
 		return 0;
 
-	/*
-	 * NEEDSWORK: Remove this when all submodule object accesses are
-	 * through explicitly specified repositores.
-	 */
-	if (add_submodule_odb(path)) {
-		output(opt, 1, _("Failed to merge submodule %s (not checked out)"), path);
-		return 0;
-	}
-
 	if (repo_submodule_init(&subrepo, opt->repo, path, null_oid())) {
 		output(opt, 1, _("Failed to merge submodule %s (not checked out)"), path);
 		return 0;
@@ -1232,7 +1231,7 @@ static int merge_submodule(struct merge_options *opt,
 		oidcpy(result, b);
 		if (show(opt, 3)) {
 			output(opt, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
-			output_commit_title(opt, commit_b);
+			repo_output_commit_title(opt, &subrepo, commit_b);
 		} else if (show(opt, 2))
 			output(opt, 2, _("Fast-forwarding submodule %s"), path);
 		else
@@ -1245,7 +1244,7 @@ static int merge_submodule(struct merge_options *opt,
 		oidcpy(result, a);
 		if (show(opt, 3)) {
 			output(opt, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
-			output_commit_title(opt, commit_a);
+			repo_output_commit_title(opt, &subrepo, commit_a);
 		} else if (show(opt, 2))
 			output(opt, 2, _("Fast-forwarding submodule %s"), path);
 		else
@@ -1277,7 +1276,7 @@ static int merge_submodule(struct merge_options *opt,
 	case 1:
 		output(opt, 1, _("Failed to merge submodule %s (not fast-forward)"), path);
 		output(opt, 2, _("Found a possible merge resolution for the submodule:\n"));
-		print_commit((struct commit *) merges.objects[0].item);
+		print_commit(&subrepo, (struct commit *) merges.objects[0].item);
 		output(opt, 2, _(
 		       "If this is correct simply add it to the index "
 		       "for example\n"
@@ -1290,7 +1289,7 @@ static int merge_submodule(struct merge_options *opt,
 	default:
 		output(opt, 1, _("Failed to merge submodule %s (multiple merges found)"), path);
 		for (i = 0; i < merges.nr; i++)
-			print_commit((struct commit *) merges.objects[i].item);
+			print_commit(&subrepo, (struct commit *) merges.objects[i].item);
 	}
 
 	object_array_clear(&merges);
diff --git a/object-file.c b/object-file.c
index 8b35fd85bf..b3e1718885 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1528,7 +1528,14 @@ static int do_oid_object_info_extended(struct repository *r,
 				break;
 		}
 
-		if (register_all_submodule_odb_as_alternates())
+		/*
+		 * If r is the_repository, this might be an attempt at
+		 * accessing a submodule object as if it were in the_repository
+		 * (having called add_submodule_odb() on that submodule's ODB).
+		 * If any such ODBs exist, register them and try again.
+		 */
+		if (r == the_repository &&
+		    register_all_submodule_odb_as_alternates())
 			/* We added some alternates; retry */
 			continue;
 
diff --git a/refs.c b/refs.c
index 7f019c2377..d7cc0a23a3 100644
--- a/refs.c
+++ b/refs.c
@@ -251,12 +251,13 @@ int refname_is_safe(const char *refname)
  * does not exist, emit a warning and return false.
  */
 int ref_resolves_to_object(const char *refname,
+			   struct repository *repo,
 			   const struct object_id *oid,
 			   unsigned int flags)
 {
 	if (flags & REF_ISBROKEN)
 		return 0;
-	if (!has_object_file(oid)) {
+	if (!repo_has_object_file(repo, oid)) {
 		error(_("%s does not point to a valid object!"), refname);
 		return 0;
 	}
@@ -1870,7 +1871,8 @@ static struct ref_store *lookup_ref_store_map(struct hashmap *map,
  * Create, record, and return a ref_store instance for the specified
  * gitdir.
  */
-static struct ref_store *ref_store_init(const char *gitdir,
+static struct ref_store *ref_store_init(struct repository *repo,
+					const char *gitdir,
 					unsigned int flags)
 {
 	const char *be_name = "files";
@@ -1880,7 +1882,7 @@ static struct ref_store *ref_store_init(const char *gitdir,
 	if (!be)
 		BUG("reference backend %s is unknown", be_name);
 
-	refs = be->init(gitdir, flags);
+	refs = be->init(repo, gitdir, flags);
 	return refs;
 }
 
@@ -1892,7 +1894,7 @@ struct ref_store *get_main_ref_store(struct repository *r)
 	if (!r->gitdir)
 		BUG("attempting to get main_ref_store outside of repository");
 
-	r->refs_private = ref_store_init(r->gitdir, REF_STORE_ALL_CAPS);
+	r->refs_private = ref_store_init(r, r->gitdir, REF_STORE_ALL_CAPS);
 	r->refs_private = maybe_debug_wrap_ref_store(r->gitdir, r->refs_private);
 	return r->refs_private;
 }
@@ -1922,6 +1924,7 @@ struct ref_store *get_submodule_ref_store(const char *submodule)
 	struct ref_store *refs;
 	char *to_free = NULL;
 	size_t len;
+	struct repository *subrepo;
 
 	if (!submodule)
 		return NULL;
@@ -1947,8 +1950,19 @@ struct ref_store *get_submodule_ref_store(const char *submodule)
 	if (submodule_to_gitdir(&submodule_sb, submodule))
 		goto done;
 
-	/* assume that add_submodule_odb() has been called */
-	refs = ref_store_init(submodule_sb.buf,
+	subrepo = xmalloc(sizeof(*subrepo));
+	/*
+	 * NEEDSWORK: Make get_submodule_ref_store() work with arbitrary
+	 * superprojects other than the_repository. This probably should be
+	 * done by making it take a struct repository * parameter instead of a
+	 * submodule path.
+	 */
+	if (repo_submodule_init(subrepo, the_repository, submodule,
+				null_oid())) {
+		free(subrepo);
+		goto done;
+	}
+	refs = ref_store_init(subrepo, submodule_sb.buf,
 			      REF_STORE_READ | REF_STORE_ODB);
 	register_ref_store_map(&submodule_ref_stores, "submodule",
 			       refs, submodule);
@@ -1974,10 +1988,12 @@ struct ref_store *get_worktree_ref_store(const struct worktree *wt)
 		return refs;
 
 	if (wt->id)
-		refs = ref_store_init(git_common_path("worktrees/%s", wt->id),
+		refs = ref_store_init(the_repository,
+				      git_common_path("worktrees/%s", wt->id),
 				      REF_STORE_ALL_CAPS);
 	else
-		refs = ref_store_init(get_git_common_dir(),
+		refs = ref_store_init(the_repository,
+				      get_git_common_dir(),
 				      REF_STORE_ALL_CAPS);
 
 	if (refs)
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 6a6ead0b99..151b0056fe 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -79,13 +79,15 @@ static void clear_loose_ref_cache(struct files_ref_store *refs)
  * Create a new submodule ref cache and add it to the internal
  * set of caches.
  */
-static struct ref_store *files_ref_store_create(const char *gitdir,
+static struct ref_store *files_ref_store_create(struct repository *repo,
+						const char *gitdir,
 						unsigned int flags)
 {
 	struct files_ref_store *refs = xcalloc(1, sizeof(*refs));
 	struct ref_store *ref_store = (struct ref_store *)refs;
 	struct strbuf sb = STRBUF_INIT;
 
+	ref_store->repo = repo;
 	ref_store->gitdir = xstrdup(gitdir);
 	base_ref_store_init(ref_store, &refs_be_files);
 	refs->store_flags = flags;
@@ -93,7 +95,7 @@ static struct ref_store *files_ref_store_create(const char *gitdir,
 	get_common_dir_noenv(&sb, gitdir);
 	refs->gitcommondir = strbuf_detach(&sb, NULL);
 	strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir);
-	refs->packed_ref_store = packed_ref_store_create(sb.buf, flags);
+	refs->packed_ref_store = packed_ref_store_create(repo, sb.buf, flags);
 	strbuf_release(&sb);
 
 	chdir_notify_reparent("files-backend $GIT_DIR", &refs->base.gitdir);
@@ -730,6 +732,7 @@ struct files_ref_iterator {
 	struct ref_iterator base;
 
 	struct ref_iterator *iter0;
+	struct repository *repo;
 	unsigned int flags;
 };
 
@@ -751,6 +754,7 @@ static int files_ref_iterator_advance(struct ref_iterator *ref_iterator)
 
 		if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
 		    !ref_resolves_to_object(iter->iter0->refname,
+					    iter->repo,
 					    iter->iter0->oid,
 					    iter->iter0->flags))
 			continue;
@@ -829,7 +833,7 @@ static struct ref_iterator *files_ref_iterator_begin(
 	 */
 
 	loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs),
-					      prefix, 1);
+					      prefix, ref_store->repo, 1);
 
 	/*
 	 * The packed-refs file might contain broken references, for
@@ -853,6 +857,7 @@ static struct ref_iterator *files_ref_iterator_begin(
 	base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable,
 			       overlay_iter->ordered);
 	iter->iter0 = overlay_iter;
+	iter->repo = ref_store->repo;
 	iter->flags = flags;
 
 	return ref_iterator;
@@ -1169,7 +1174,7 @@ static int should_pack_ref(const char *refname,
 		return 0;
 
 	/* Do not pack broken refs: */
-	if (!ref_resolves_to_object(refname, oid, ref_flags))
+	if (!ref_resolves_to_object(refname, the_repository, oid, ref_flags))
 		return 0;
 
 	return 1;
@@ -1192,7 +1197,8 @@ static int files_pack_refs(struct ref_store *ref_store, unsigned int flags)
 
 	packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err);
 
-	iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0);
+	iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL,
+					the_repository, 0);
 	while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
 		/*
 		 * If the loose reference can be packed, add an entry
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 47247a1491..1c5211b03e 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -193,13 +193,15 @@ static int release_snapshot(struct snapshot *snapshot)
 	}
 }
 
-struct ref_store *packed_ref_store_create(const char *path,
+struct ref_store *packed_ref_store_create(struct repository *repo,
+					  const char *path,
 					  unsigned int store_flags)
 {
 	struct packed_ref_store *refs = xcalloc(1, sizeof(*refs));
 	struct ref_store *ref_store = (struct ref_store *)refs;
 
 	base_ref_store_init(ref_store, &refs_be_packed);
+	ref_store->repo = repo;
 	ref_store->gitdir = xstrdup(path);
 	refs->store_flags = store_flags;
 
@@ -776,6 +778,7 @@ struct packed_ref_iterator {
 	struct object_id oid, peeled;
 	struct strbuf refname_buf;
 
+	struct repository *repo;
 	unsigned int flags;
 };
 
@@ -864,8 +867,8 @@ static int packed_ref_iterator_advance(struct ref_iterator *ref_iterator)
 			continue;
 
 		if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
-		    !ref_resolves_to_object(iter->base.refname, &iter->oid,
-					    iter->flags))
+		    !ref_resolves_to_object(iter->base.refname, iter->repo,
+					    &iter->oid, iter->flags))
 			continue;
 
 		return ITER_OK;
@@ -883,6 +886,9 @@ static int packed_ref_iterator_peel(struct ref_iterator *ref_iterator,
 	struct packed_ref_iterator *iter =
 		(struct packed_ref_iterator *)ref_iterator;
 
+	if (iter->repo != the_repository)
+		BUG("peeling for non-the_repository is not supported");
+
 	if ((iter->base.flags & REF_KNOWS_PEELED)) {
 		oidcpy(peeled, &iter->peeled);
 		return is_null_oid(&iter->peeled) ? -1 : 0;
@@ -954,6 +960,7 @@ static struct ref_iterator *packed_ref_iterator_begin(
 
 	iter->base.oid = &iter->oid;
 
+	iter->repo = ref_store->repo;
 	iter->flags = flags;
 
 	if (prefix && *prefix)
diff --git a/refs/packed-backend.h b/refs/packed-backend.h
index a01a0aff9c..f61a73ec25 100644
--- a/refs/packed-backend.h
+++ b/refs/packed-backend.h
@@ -1,6 +1,7 @@
 #ifndef REFS_PACKED_BACKEND_H
 #define REFS_PACKED_BACKEND_H
 
+struct repository;
 struct ref_transaction;
 
 /*
@@ -12,7 +13,8 @@ struct ref_transaction;
  * even among packed refs.
  */
 
-struct ref_store *packed_ref_store_create(const char *path,
+struct ref_store *packed_ref_store_create(struct repository *repo,
+					  const char *path,
 					  unsigned int store_flags);
 
 /*
diff --git a/refs/ref-cache.c b/refs/ref-cache.c
index a5ad8a39fb..be4aa5e098 100644
--- a/refs/ref-cache.c
+++ b/refs/ref-cache.c
@@ -378,6 +378,8 @@ struct cache_ref_iterator {
 	 * on from there.)
 	 */
 	struct cache_ref_iterator_level *levels;
+
+	struct repository *repo;
 };
 
 static int cache_ref_iterator_advance(struct ref_iterator *ref_iterator)
@@ -434,6 +436,11 @@ static int cache_ref_iterator_advance(struct ref_iterator *ref_iterator)
 static int cache_ref_iterator_peel(struct ref_iterator *ref_iterator,
 				   struct object_id *peeled)
 {
+	struct cache_ref_iterator *iter =
+		(struct cache_ref_iterator *)ref_iterator;
+
+	if (iter->repo != the_repository)
+		BUG("peeling for non-the_repository is not supported");
 	return peel_object(ref_iterator->oid, peeled) ? -1 : 0;
 }
 
@@ -456,6 +463,7 @@ static struct ref_iterator_vtable cache_ref_iterator_vtable = {
 
 struct ref_iterator *cache_ref_iterator_begin(struct ref_cache *cache,
 					      const char *prefix,
+					      struct repository *repo,
 					      int prime_dir)
 {
 	struct ref_dir *dir;
@@ -490,5 +498,7 @@ struct ref_iterator *cache_ref_iterator_begin(struct ref_cache *cache,
 		level->prefix_state = PREFIX_CONTAINS_DIR;
 	}
 
+	iter->repo = repo;
+
 	return ref_iterator;
 }
diff --git a/refs/ref-cache.h b/refs/ref-cache.h
index 5c042ae718..850d9d3744 100644
--- a/refs/ref-cache.h
+++ b/refs/ref-cache.h
@@ -214,6 +214,7 @@ struct ref_entry *find_ref_entry(struct ref_dir *dir, const char *refname);
  */
 struct ref_iterator *cache_ref_iterator_begin(struct ref_cache *cache,
 					      const char *prefix,
+					      struct repository *repo,
 					      int prime_dir);
 
 #endif /* REFS_REF_CACHE_H */
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 72746407fc..12224742ed 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -66,6 +66,7 @@ int refname_is_safe(const char *refname);
  * referred-to object does not exist, emit a warning and return false.
  */
 int ref_resolves_to_object(const char *refname,
+			   struct repository *repo,
 			   const struct object_id *oid,
 			   unsigned int flags);
 
@@ -539,7 +540,8 @@ struct ref_store;
  * should call base_ref_store_init() to initialize the shared part of
  * the ref_store and to record the ref_store for later lookup.
  */
-typedef struct ref_store *ref_store_init_fn(const char *gitdir,
+typedef struct ref_store *ref_store_init_fn(struct repository *repo,
+					    const char *gitdir,
 					    unsigned int flags);
 
 typedef int ref_init_db_fn(struct ref_store *refs, struct strbuf *err);
@@ -701,7 +703,12 @@ struct ref_store {
 	/* The backend describing this ref_store's storage scheme: */
 	const struct ref_storage_be *be;
 
-	/* The gitdir that this ref_store applies to: */
+	struct repository *repo;
+
+	/*
+	 * The gitdir that this ref_store applies to. Note that this is not
+	 * necessarily repo->gitdir if the repo has multiple worktrees.
+	 */
 	char *gitdir;
 };
 
diff --git a/strbuf.c b/strbuf.c
index c8a5789694..b22e981655 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -1059,15 +1059,21 @@ void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
 	strbuf_setlen(sb, sb->len + len);
 }
 
-void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
-			      int abbrev_len)
+void strbuf_repo_add_unique_abbrev(struct strbuf *sb, struct repository *repo,
+				   const struct object_id *oid, int abbrev_len)
 {
 	int r;
 	strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
-	r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
+	r = repo_find_unique_abbrev_r(repo, sb->buf + sb->len, oid, abbrev_len);
 	strbuf_setlen(sb, sb->len + r);
 }
 
+void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
+			      int abbrev_len)
+{
+	strbuf_repo_add_unique_abbrev(sb, the_repository, oid, abbrev_len);
+}
+
 /*
  * Returns the length of a line, without trailing spaces.
  *
diff --git a/strbuf.h b/strbuf.h
index 3b36bbc49f..96512f85b3 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -634,8 +634,10 @@ void strbuf_list_free(struct strbuf **list);
  * Add the abbreviation, as generated by find_unique_abbrev, of `sha1` to
  * the strbuf `sb`.
  */
-void strbuf_add_unique_abbrev(struct strbuf *sb,
-			      const struct object_id *oid,
+struct repository;
+void strbuf_repo_add_unique_abbrev(struct strbuf *sb, struct repository *repo,
+				   const struct object_id *oid, int abbrev_len);
+void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 			      int abbrev_len);
 
 /**
diff --git a/submodule.c b/submodule.c
index f3c99634a9..c689070524 100644
--- a/submodule.c
+++ b/submodule.c
@@ -201,6 +201,8 @@ int register_all_submodule_odb_as_alternates(void)
 		add_to_alternates_memory(added_submodule_odb_paths.items[i].string);
 	if (ret) {
 		string_list_clear(&added_submodule_odb_paths, 0);
+		trace2_data_intmax("submodule", the_repository,
+				   "register_all_submodule_odb_as_alternates/registered", ret);
 		if (git_env_bool("GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB", 0))
 			BUG("register_all_submodule_odb_as_alternates() called");
 	}
@@ -928,23 +930,33 @@ struct has_commit_data {
 static int check_has_commit(const struct object_id *oid, void *data)
 {
 	struct has_commit_data *cb = data;
+	struct repository subrepo;
+	enum object_type type;
 
-	enum object_type type = oid_object_info(cb->repo, oid, NULL);
+	if (repo_submodule_init(&subrepo, cb->repo, cb->path, null_oid())) {
+		cb->result = 0;
+		goto cleanup;
+	}
+
+	type = oid_object_info(&subrepo, oid, NULL);
 
 	switch (type) {
 	case OBJ_COMMIT:
-		return 0;
+		goto cleanup;
 	case OBJ_BAD:
 		/*
 		 * Object is missing or invalid. If invalid, an error message
 		 * has already been printed.
 		 */
 		cb->result = 0;
-		return 0;
+		goto cleanup;
 	default:
 		die(_("submodule entry '%s' (%s) is a %s, not a commit"),
 		    cb->path, oid_to_hex(oid), type_name(type));
 	}
+cleanup:
+	repo_clear(&subrepo);
+	return 0;
 }
 
 static int submodule_has_commits(struct repository *r,
diff --git a/t/README b/t/README
index b92155a822..29f72354bf 100644
--- a/t/README
+++ b/t/README
@@ -463,11 +463,8 @@ GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=<boolean>, when true, makes
 registering submodule ODBs as alternates a fatal action. Support for
 this environment variable can be removed once the migration to
 explicitly providing repositories when accessing submodule objects is
-complete (in which case we might want to replace this with a trace2
-call so that users can make it visible if accessing submodule objects
-without an explicit repository still happens) or needs to be abandoned
-for whatever reason (in which case the migrated codepaths still retain
-their performance benefits).
+complete or needs to be abandoned for whatever reason (in which case the
+migrated codepaths still retain their performance benefits).
 
 Naming Tests
 ------------
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index ed11569d8d..2dc75b80db 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -6,6 +6,9 @@ test_description='Recursive "git fetch" for submodules'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 pwd=$(pwd)
diff --git a/t/t5531-deep-submodule-push.sh b/t/t5531-deep-submodule-push.sh
index d573ca496a..3f58b515ce 100755
--- a/t/t5531-deep-submodule-push.sh
+++ b/t/t5531-deep-submodule-push.sh
@@ -5,6 +5,9 @@ test_description='test push with submodules'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t5545-push-options.sh b/t/t5545-push-options.sh
index 58c7add7ee..214228349a 100755
--- a/t/t5545-push-options.sh
+++ b/t/t5545-push-options.sh
@@ -5,6 +5,9 @@ test_description='pushing to a repository using push options'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 mk_repo_pair () {
diff --git a/t/t5572-pull-submodule.sh b/t/t5572-pull-submodule.sh
index 4f92a116e1..fa6b4cca65 100755
--- a/t/t5572-pull-submodule.sh
+++ b/t/t5572-pull-submodule.sh
@@ -2,6 +2,9 @@
 
 test_description='pull can handle submodules'
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-submodule-update.sh
 
diff --git a/t/t6437-submodule-merge.sh b/t/t6437-submodule-merge.sh
index e5e89c2045..178413c22f 100755
--- a/t/t6437-submodule-merge.sh
+++ b/t/t6437-submodule-merge.sh
@@ -5,6 +5,9 @@ test_description='merging with submodules'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-merge.sh
 
diff --git a/t/t7418-submodule-sparse-gitmodules.sh b/t/t7418-submodule-sparse-gitmodules.sh
index 3f7f271883..f87e524d6d 100755
--- a/t/t7418-submodule-sparse-gitmodules.sh
+++ b/t/t7418-submodule-sparse-gitmodules.sh
@@ -12,6 +12,9 @@ The test setup uses a sparse checkout, however the same scenario can be set up
 also by committing .gitmodules and then just removing it from the filesystem.
 '
 
+GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB=1
+export GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB
+
 . ./test-lib.sh
 
 test_expect_success 'sparse checkout setup which hides .gitmodules' '