Merge branch 'ao/submodule-wo-gitmodules-checked-out'

The submodule support has been updated to read from the blob at
HEAD:.gitmodules when the .gitmodules file is missing from the
working tree.

* ao/submodule-wo-gitmodules-checked-out:
  t/helper: add test-submodule-nested-repo-config
  submodule: support reading .gitmodules when it's not in the working tree
  submodule: add a helper to check if it is safe to write to .gitmodules
  t7506: clean up .gitmodules properly before setting up new scenario
  submodule: use the 'submodule--helper config' command
  submodule--helper: add a new 'config' subcommand
  t7411: be nicer to future tests and really clean things up
  t7411: merge tests 5 and 6
  submodule: factor out a config_set_in_gitmodules_file_gently function
  submodule: add a print_config_from_gitmodules() helper

1 files changed, 14 insertions, 3 deletions

diff --git a/builtin/grep.c b/builtin/grep.c
index d8508ddf79..56e4a11052 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -422,11 +422,23 @@ static int grep_submodule(struct grep_opt *opt, struct repository *superproject,
 	struct repository submodule;
 	int hit;
 
-	if (!is_submodule_active(superproject, path))
+	/*
+	 * NEEDSWORK: submodules functions need to be protected because they
+	 * access the object store via config_from_gitmodules(): the latter
+	 * uses get_oid() which, for now, relies on the global the_repository
+	 * object.
+	 */
+	grep_read_lock();
+
+	if (!is_submodule_active(superproject, path)) {
+		grep_read_unlock();
 		return 0;
+	}
 
-	if (repo_submodule_init(&submodule, superproject, path))
+	if (repo_submodule_init(&submodule, superproject, path)) {
+		grep_read_unlock();
 		return 0;
+	}
 
 	repo_read_gitmodules(&submodule);
 
@@ -440,7 +452,6 @@ static int grep_submodule(struct grep_opt *opt, struct repository *superproject,
 	 * store is no longer global and instead is a member of the repository
 	 * object.
 	 */
-	grep_read_lock();
 	add_to_alternates_memory(submodule.objects->objectdir);
 	grep_read_unlock();