+static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
+{
+ const struct submodule *sub;
+ const char *path;
+ char *cw;
+ struct repository subrepo;
+
+ if (argc != 2)
+ BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
+
+ path = argv[1];
+
+ sub = submodule_from_path(the_repository, &null_oid, path);
+ if (!sub)
+ BUG("We could get the submodule handle before?");
+
+ if (repo_submodule_init(&subrepo, the_repository, path))
+ die(_("could not get a repository handle for submodule '%s'"), path);
+
+ if (!repo_config_get_string(&subrepo, "core.worktree", &cw)) {
+ char *cfg_file, *abs_path;
+ const char *rel_path;
+ struct strbuf sb = STRBUF_INIT;
+
+ cfg_file = repo_git_path(&subrepo, "config");
+
+ abs_path = absolute_pathdup(path);
+ rel_path = relative_path(abs_path, subrepo.gitdir, &sb);
+
+ git_config_set_in_file(cfg_file, "core.worktree", rel_path);
+
+ free(cfg_file);
+ free(abs_path);
+ strbuf_release(&sb);
+ }
+
+ return 0;
+}
+