https://git.ruby-lang.org/ruby.git/commit/?id=f3ad8a00e2

From f3ad8a00e260184be1b63231e2f99a1ef73eba60 Mon Sep 17 00:00:00 2001
From: MSP-Greg <Greg.mpls@g...>
Date: Tue, 16 Jun 2020 20:31:15 -0500
Subject: [rubygems/rubygems] bundler/lib/bundler/installer.rb - fix Windows
 'executable_stubs'

Windows normal shell requires binstubs with *.cmd extensions

https://github.com/rubygems/rubygems/commit/b46326eb1f

diff --git a/lib/bundler/installer.rb b/lib/bundler/installer.rb
index 44ef396..8be4bb1 100644
--- a/lib/bundler/installer.rb
+++ b/lib/bundler/installer.rb
@@ -135,12 +135,17 @@ module Bundler https://github.com/ruby/ruby/blob/trunk/lib/bundler/installer.rb#L135
           next
         end
 
-        File.open(binstub_path, "w", 0o777 & ~File.umask) do |f|
-          if RUBY_VERSION >= "2.6"
-            f.puts ERB.new(template, :trim_mode => "-").result(binding)
-          else
-            f.puts ERB.new(template, nil, "-").result(binding)
-          end
+        mode = Bundler::WINDOWS ? "wb:UTF-8" : "w"
+        content = if RUBY_VERSION >= "2.6"
+          ERB.new(template, :trim_mode => "-").result(binding)
+        else
+          ERB.new(template, nil, "-").result(binding)
+        end
+
+        File.write(binstub_path, content, :mode => mode, :perm => 0o777 & ~File.umask)
+        if Bundler::WINDOWS
+          prefix = "@ruby -x \"%~f0\" %*\n@exit /b %ERRORLEVEL%\n\n"
+          File.write("#{binstub_path}.cmd", prefix + content, :mode => mode)
         end
       end
 
@@ -175,12 +180,18 @@ module Bundler https://github.com/ruby/ruby/blob/trunk/lib/bundler/installer.rb#L180
         next if executable == "bundle"
         executable_path = Pathname(spec.full_gem_path).join(spec.bindir, executable).relative_path_from(bin_path)
         executable_path = executable_path
-        File.open "#{bin_path}/#{executable}", "w", 0o755 do |f|
-          if RUBY_VERSION >= "2.6"
-            f.puts ERB.new(template, :trim_mode => "-").result(binding)
-          else
-            f.puts ERB.new(template, nil, "-").result(binding)
-          end
+
+        mode = Bundler::WINDOWS ? "wb:UTF-8" : "w"
+        content = if RUBY_VERSION >= "2.6"
+          ERB.new(template, :trim_mode => "-").result(binding)
+        else
+          ERB.new(template, nil, "-").result(binding)
+        end
+
+        File.write("#{bin_path}/#{executable}", content, :mode => mode, :perm => 0o755)
+        if Bundler::WINDOWS
+          prefix = "@ruby -x \"%~f0\" %*\n@exit /b %ERRORLEVEL%\n\n"
+          File.write("#{bin_path}/#{executable}.cmd", prefix + content, :mode => mode)
         end
       end
     end
-- 
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