https://git.ruby-lang.org/ruby.git/commit/?id=179aa26f4f

From 179aa26f4fe19ceeb9eceb40e23f7b50d65d1b49 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 28 Oct 2021 13:14:31 +0900
Subject: Prune stale worktrees before checking out a new pull request [ci
 skip]

---
 defs/gmake.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/defs/gmake.mk b/defs/gmake.mk
index e533396bae9..dd258970543 100644
--- a/defs/gmake.mk
+++ b/defs/gmake.mk
@@ -233,6 +233,7 @@ define pull-github https://github.com/ruby/ruby/blob/trunk/defs/gmake.mk#L233
 	$(eval GITHUB_MERGE_BASE := $(shell git -C "$(srcdir)" log -1 --format=format:%H))
 	$(eval GITHUB_MERGE_BRANCH := $(shell git -C "$(srcdir)" symbolic-ref --short HEAD))
 	$(eval GITHUB_MERGE_WORKTREE := $(shell mktemp -d "$(srcdir)/gh-$(1)-XXXXXX"))
+	git -C "$(srcdir)" worktree prune
 	git -C "$(srcdir)" worktree add $(notdir $(GITHUB_MERGE_WORKTREE)) "gh-$(1)"
 	git -C "$(GITHUB_MERGE_WORKTREE)" rebase $(GITHUB_MERGE_BRANCH)
 	$(eval COMMIT_GPG_SIGN := $(COMMIT_GPG_SIGN))
-- 
cgit v1.2.1


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