https://git.ruby-lang.org/ruby.git/commit/?id=8e6a68c18e

From 8e6a68c18edeb8dfef494862093539d987b6ad6a Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Sun, 14 Jul 2019 21:49:10 +0900
Subject: Use force flag for filter-branch.


diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 5c9ee9a..27d8dbf 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -253,7 +253,7 @@ def sync_default_gems_with_commits(gem, range) https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L253
         break
       end
 
-      `git filter-branch --msg-filter 'echo "[#{$repositories[gem.to_sym]}]" && echo && cat' -- HEAD~1..HEAD`
+      `git filter-branch -f --msg-filter 'echo "[#{$repositories[gem.to_sym]}]" && echo && cat' -- HEAD~1..HEAD`
     end
   end
 end
-- 
cgit v0.10.2


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