[rubygems/rubygems] Fix force_ruby_platform: when the lockfile only locks the ruby platform

https://github.com/rubygems/rubygems/commit/7c50064c3c

lib/bundler/spec_set.rb

@@ -202,6 +202,7 @@ module Bundler
       specs_for_name = lookup[dep.name]
       target_platform = dep.force_ruby_platform ? Gem::Platform::RUBY : (platform || Bundler.local_platform)
       matching_specs = GemHelpers.select_best_platform_match(specs_for_name, target_platform)
+      matching_specs.each {|s| s.force_ruby_platform = true } if dep.force_ruby_platform
       matching_specs.map!(&:materialize_for_installation).compact! if platform.nil?
       matching_specs
     end

spec/bundler/install/gemfile/force_ruby_platform_spec.rb

@@ -114,5 +114,48 @@ RSpec.describe "bundle install with force_ruby_platform DSL option", :jruby do
       expect(the_bundle).to include_gems "depends_on_platform_specific 1.0.0 RUBY"
       expect(the_bundle).to include_gems "platform_specific 1.0.0 #{Bundler.local_platform}"
     end
+
+    it "uses ruby variants for the explicit transitive dependency with a lockile that has only ruby platform" do
+      lockfile <<-L
+        GEM
+          remote: #{file_uri_for(gem_repo4)}
+          specs:
+            dep_level_2 (1.0)
+              depends_on_platform_specific
+            depends_on_platform_specific (1.0)
+              platform_specific
+            platform_specific (1.0)
+
+        PLATFORMS
+          ruby
+
+        DEPENDENCIES
+          dep_level_2
+          platform_specific
+
+        BUNDLED WITH
+            #{Bundler::VERSION}
+      L
+
+      install_gemfile <<-G, :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }, :artifice => "compact_index", :verbose => true
+        source "#{file_uri_for(gem_repo4)}"
+
+        gem "platform_specific"
+        gem "depends_on_platform_specific"
+      G
+
+      expect(the_bundle).to include_gems "depends_on_platform_specific 1.0.0 #{Bundler.local_platform}"
+      expect(the_bundle).to include_gems "platform_specific 1.0.0 #{Bundler.local_platform}"
+
+      install_gemfile <<-G, :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }, :artifice => "compact_index"
+        source "#{file_uri_for(gem_repo4)}"
+
+        gem "platform_specific", :force_ruby_platform => true
+        gem "depends_on_platform_specific"
+      G
+
+      expect(the_bundle).to include_gems "depends_on_platform_specific 1.0.0 #{Bundler.local_platform}"
+      expect(the_bundle).to include_gems "platform_specific 1.0.0 RUBY"
+    end
   end
 end