https://git.ruby-lang.org/ruby.git/commit/?id=b61f3a9199

From b61f3a9199adb771d785c948ceb8dac61e0fc77f Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Thu, 10 Mar 2022 13:32:31 +0900
Subject: backport the latest version of sync_default_gems

---
 tool/sync_default_gems.rb | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index ca5283d2c3..564877a26b 100755
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -530,7 +530,7 @@ def sync_lib(repo, upstream = nil) https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L530
   cp_r("#{upstream}/#{repo}.gemspec", "#{gemspec}")
 end
 
-def update_default_gems(gem)
+def update_default_gems(gem, release: false)
 
   author, repository = REPOSITORIES[gem.to_sym].split('/')
 
@@ -552,9 +552,15 @@ def update_default_gems(gem) https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L552
     end
     `git checkout ruby-core`
     `git rebase ruby-core/master`
-    `git checkout master`
-    `git fetch origin master`
-    `git rebase origin/master`
+    `git fetch origin --tags`
+
+    if release
+      last_release = `git tag`.chomp.split.delete_if{|v| v =~ /pre|beta/ }.last
+      `git checkout #{last_release}`
+    else
+      `git checkout master`
+      `git rebase origin/master`
+    end
   end
 end
 
@@ -566,7 +572,14 @@ when "up" https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L572
     REPOSITORIES.keys.each{|gem| update_default_gems(gem.to_s)}
   end
 when "all"
-  REPOSITORIES.keys.each{|gem| sync_default_gems(gem.to_s)}
+  if ARGV[1] == "release"
+    REPOSITORIES.keys.each do |gem|
+      update_default_gems(gem.to_s, release: true)
+      sync_default_gems(gem.to_s)
+    end
+  else
+    REPOSITORIES.keys.each{|gem| sync_default_gems(gem.to_s)}
+  end
 when "list"
   ARGV.shift
   pattern = Regexp.new(ARGV.join('|'))
-- 
cgit v1.2.1


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