[rubygems/rubygems] Fix musl platform not being added to the lockfile

https://github.com/rubygems/rubygems/commit/235f7b4266

lib/bundler/spec_set.rb

@@ -65,7 +65,7 @@ module Bundler
 
       platforms.concat(new_platforms)
 
-      less_specific_platform = new_platforms.find {|platform| platform != Gem::Platform::RUBY && platform === Bundler.local_platform }
+      less_specific_platform = new_platforms.find {|platform| platform != Gem::Platform::RUBY && Bundler.local_platform === platform }
       platforms.delete(Bundler.local_platform) if less_specific_platform
 
       platforms

spec/bundler/install/gemfile/specific_platform_spec.rb

@@ -1262,6 +1262,120 @@ RSpec.describe "bundle install with specific platforms" do
     end
   end
 
+  it "adds current musl platform" do
+    build_repo4 do
+      build_gem "rcee_precompiled", "0.5.0" do |s|
+        s.platform = "x86_64-linux"
+      end
+
+      build_gem "rcee_precompiled", "0.5.0" do |s|
+        s.platform = "x86_64-linux-musl"
+      end
+    end
+
+    gemfile <<~G
+      source "#{file_uri_for(gem_repo4)}"
+
+      gem "rcee_precompiled", "0.5.0"
+    G
+
+    simulate_platform "x86_64-linux-musl" do
+      bundle "lock", artifice: "compact_index", env: { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+
+      expect(lockfile).to eq(<<~L)
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            rcee_precompiled (0.5.0-x86_64-linux)
+            rcee_precompiled (0.5.0-x86_64-linux-musl)
+
+        PLATFORMS
+          x86_64-linux
+          x86_64-linux-musl
+
+        DEPENDENCIES
+          rcee_precompiled (= 0.5.0)
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+    end
+  end
+
+  it "adds current musl platform, when there are also gnu variants", rubygems: ">= 3.3.21" do
+    build_repo4 do
+      build_gem "rcee_precompiled", "0.5.0" do |s|
+        s.platform = "x86_64-linux-gnu"
+      end
+
+      build_gem "rcee_precompiled", "0.5.0" do |s|
+        s.platform = "x86_64-linux-musl"
+      end
+    end
+
+    gemfile <<~G
+      source "#{file_uri_for(gem_repo4)}"
+
+      gem "rcee_precompiled", "0.5.0"
+    G
+
+    simulate_platform "x86_64-linux-musl" do
+      bundle "lock", artifice: "compact_index", env: { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+
+      expect(lockfile).to eq(<<~L)
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            rcee_precompiled (0.5.0-x86_64-linux-gnu)
+            rcee_precompiled (0.5.0-x86_64-linux-musl)
+
+        PLATFORMS
+          x86_64-linux-gnu
+          x86_64-linux-musl
+
+        DEPENDENCIES
+          rcee_precompiled (= 0.5.0)
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+    end
+  end
+
+  it "does not add current platform if there's an equivalent less specific platform among the ones resolved" do
+    build_repo4 do
+      build_gem "rcee_precompiled", "0.5.0" do |s|
+        s.platform = "universal-darwin"
+      end
+    end
+
+    gemfile <<~G
+      source "#{file_uri_for(gem_repo4)}"
+
+      gem "rcee_precompiled", "0.5.0"
+    G
+
+    simulate_platform "x86_64-darwin-15" do
+      bundle "lock", artifice: "compact_index", env: { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+
+      expect(lockfile).to eq(<<~L)
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            rcee_precompiled (0.5.0-universal-darwin)
+
+        PLATFORMS
+          universal-darwin
+
+        DEPENDENCIES
+          rcee_precompiled (= 0.5.0)
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+    end
+  end
+
   private
 
   def setup_multiplatform_gem