1 files changed, 23 insertions, 0 deletions
diff --git a/branch.c b/branch.c
index c50ea4217..416244370 100644
--- a/branch.c
+++ b/branch.c
@@ -344,3 +344,26 @@ void die_if_checked_out(const char *branch)
 		die(_("'%s' is already checked out at '%s'"), branch, existing);
 	}
 }
+
+int replace_each_worktree_head_symref(const char *oldref, const char *newref)
+{
+	int ret = 0;
+	struct worktree **worktrees = get_worktrees();
+	int i;
+
+	for (i = 0; worktrees[i]; i++) {
+		if (worktrees[i]->is_detached)
+			continue;
+		if (strcmp(oldref, worktrees[i]->head_ref))
+			continue;
+
+		if (set_worktree_head_symref(worktrees[i]->git_dir, newref)) {
+			ret = -1;
+			error(_("HEAD of working tree %s is not updated"),
+			      worktrees[i]->path);
+		}
+	}
+
+	free_worktrees(worktrees);
+	return ret;
+}