diff --git a/builtin/worktree.c b/builtin/worktree.c
index 4035b1cb06..4fd6f7575f 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -692,25 +692,8 @@ static int can_use_local_refs(const struct add_opts *opts)
 	if (refs_head_ref(get_main_ref_store(the_repository), first_valid_ref, NULL)) {
 		return 1;
 	} else if (refs_for_each_branch_ref(get_main_ref_store(the_repository), first_valid_ref, NULL)) {
-		if (!opts->quiet) {
-			struct strbuf path = STRBUF_INIT;
-			struct strbuf contents = STRBUF_INIT;
-			char *wt_gitdir = get_worktree_git_dir(NULL);
-
-			strbuf_add_real_path(&path, wt_gitdir);
-			strbuf_addstr(&path, "/HEAD");
-			strbuf_read_file(&contents, path.buf, 64);
-			strbuf_stripspace(&contents, NULL);
-			strbuf_strip_suffix(&contents, "\n");
-
-			warning(_("HEAD points to an invalid (or orphaned) reference.\n"
-				  "HEAD path: '%s'\n"
-				  "HEAD contents: '%s'"),
-				  path.buf, contents.buf);
-			strbuf_release(&path);
-			strbuf_release(&contents);
-			free(wt_gitdir);
-		}
+		if (!opts->quiet)
+			warning(_("HEAD points to an invalid (or orphaned) reference.\n"));
 		return 1;
 	}
 	return 0;
diff --git a/t/t2400-worktree-add.sh b/t/t2400-worktree-add.sh
index 023e1301c8..58b4445cc4 100755
--- a/t/t2400-worktree-add.sh
+++ b/t/t2400-worktree-add.sh
@@ -987,7 +987,7 @@ test_dwim_orphan () {
 				then
 					test_must_be_empty actual
 				else
-					grep "$info_text" actual
+					test_grep "$info_text" actual
 				fi
 			elif [ "$outcome" = "no_infer" ]
 			then
@@ -996,39 +996,35 @@ test_dwim_orphan () {
 				then
 					test_must_be_empty actual
 				else
-					! grep "$info_text" actual
+					test_grep ! "$info_text" actual
 				fi
 			elif [ "$outcome" = "fetch_error" ]
 			then
 				test_must_fail git $dashc_args worktree add $args 2>actual &&
-				grep "$fetch_error_text" actual
+				test_grep "$fetch_error_text" actual
 			elif [ "$outcome" = "fatal_orphan_bad_combo" ]
 			then
 				test_must_fail git $dashc_args worktree add $args 2>actual &&
 				if [ $use_quiet -eq 1 ]
 				then
-					! grep "$info_text" actual
+					test_grep ! "$info_text" actual
 				else
-					grep "$info_text" actual
+					test_grep "$info_text" actual
 				fi &&
-				grep "$bad_combo_regex" actual
+				test_grep "$bad_combo_regex" actual
 			elif [ "$outcome" = "warn_bad_head" ]
 			then
 				test_must_fail git $dashc_args worktree add $args 2>actual &&
 				if [ $use_quiet -eq 1 ]
 				then
-					grep "$invalid_ref_regex" actual &&
-					! grep "$orphan_hint" actual
+					test_grep "$invalid_ref_regex" actual &&
+					test_grep ! "$orphan_hint" actual
 				else
-					headpath=$(git $dashc_args rev-parse --path-format=absolute --git-path HEAD) &&
-					headcontents=$(cat "$headpath") &&
-					grep "HEAD points to an invalid (or orphaned) reference" actual &&
-					grep "HEAD path: .$headpath." actual &&
-					grep "HEAD contents: .$headcontents." actual &&
-					grep "$orphan_hint" actual &&
-					! grep "$info_text" actual
+					test_grep "HEAD points to an invalid (or orphaned) reference" actual &&
+					test_grep "$orphan_hint" actual &&
+					test_grep ! "$info_text" actual
 				fi &&
-				grep "$invalid_ref_regex" actual
+				test_grep "$invalid_ref_regex" actual
 			else
 				# Unreachable
 				false
diff --git a/worktree.c b/worktree.c
index 56732f8f33..d874e23b4e 100644
--- a/worktree.c
+++ b/worktree.c
@@ -58,7 +58,7 @@ static void add_head_info(struct worktree *wt)
 
 static int is_current_worktree(struct worktree *wt)
 {
-	char *git_dir = absolute_pathdup(repo_get_git_dir(the_repository));
+	char *git_dir = absolute_pathdup(repo_get_git_dir(wt->repo));
 	char *wt_git_dir = get_worktree_git_dir(wt);
 	int is_current = !fspathcmp(git_dir, absolute_path(wt_git_dir));
 	free(wt_git_dir);
@@ -78,7 +78,7 @@ struct worktree *get_worktree_from_repository(struct repository *repo)
 	wt->is_bare = !repo->worktree;
 	if (fspathcmp(gitdir, commondir))
 		wt->id = xstrdup(find_last_dir_sep(gitdir) + 1);
-	wt->is_current = is_current_worktree(wt);
+	wt->is_current = true;
 	add_head_info(wt);
 
 	free(gitdir);
@@ -227,11 +227,11 @@ struct worktree **get_worktrees_without_reading_head(void)
 char *get_worktree_git_dir(const struct worktree *wt)
 {
 	if (!wt)
-		return xstrdup(repo_get_git_dir(the_repository));
+		BUG("%s() called with NULL worktree", __func__);
 	else if (!wt->id)
-		return xstrdup(repo_get_common_dir(the_repository));
+		return xstrdup(repo_get_common_dir(wt->repo));
 	else
-		return repo_common_path(the_repository, "worktrees/%s", wt->id);
+		return repo_common_path(wt->repo, "worktrees/%s", wt->id);
 }
 
 static struct worktree *find_worktree_by_suffix(struct worktree **list,
diff --git a/worktree.h b/worktree.h
index 026ef303e8..d19ec29dbb 100644
--- a/worktree.h
+++ b/worktree.h
@@ -16,7 +16,7 @@ struct worktree {
 	struct object_id head_oid;
 	int is_detached;
 	int is_bare;
-	int is_current;
+	int is_current;		/* does `path` match `repo->worktree` */
 	int lock_reason_valid; /* private */
 	int prune_reason_valid; /* private */
 };
@@ -51,7 +51,6 @@ int submodule_uses_worktrees(const char *path);
 
 /*
  * Return git dir of the worktree. Note that the path may be relative.
- * If wt is NULL, git dir of current worktree is returned.
  */
 char *get_worktree_git_dir(const struct worktree *wt);