[rubygems/rubygems] Fix regression when caching gems from secondary s…

…ources

If `cache_all_platforms` setting is enabled, the secondary source was
no longer considering cached gems.

That means that if the remote secondary source has removed its gems,
then this was now resulting in an error while before the previously
cached gem from the source would still be used.

This commit restores previous behavior.

rubygems/rubygems@2d2cd00255

lib/bundler/spec_set.rb

@@ -129,6 +129,7 @@ def materialize(deps)
     def materialized_for_all_platforms
       @specs.map do |s|
         next s unless s.is_a?(LazySpecification)
+        s.source.cached!
         s.source.remote!
         spec = s.materialize_for_installation
         raise GemNotFound, "Could not find #{s.full_name} in any of the sources" unless spec

spec/bundler/commands/cache_spec.rb

@@ -386,6 +386,66 @@
       expect(the_bundle).to include_gems "rack 1.0.0"
     end
 
+    it "uses cached gems for secondary sources when cache_all_platforms configured" do
+      build_repo4 do
+        build_gem "foo", "1.0.0" do |s|
+          s.platform = "x86_64-linux"
+        end
+
+        build_gem "foo", "1.0.0" do |s|
+          s.platform = "arm64-darwin"
+        end
+      end
+
+      gemfile <<~G
+        source "https://gems.repo2"
+
+        source "https://gems.repo4" do
+        gem "foo"
+        end
+      G
+
+      lockfile <<~L
+        GEM
+          remote: https://gems.repo2/
+          specs:
+
+        GEM
+          remote: https://gems.repo4/
+          specs:
+            foo (1.0.0-x86_64-linux)
+            foo (1.0.0-arm64-darwin)
+
+        PLATFORMS
+          arm64-darwin
+          ruby
+          x86_64-linux
+
+        DEPENDENCIES
+          foo
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+
+      simulate_platform "x86_64-linux" do
+        bundle "config set cache_all_platforms true"
+        bundle "config set path vendor/bundle"
+        bundle :cache, artifice: "compact_index", env: { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+
+        build_repo4 do
+          # simulate removal of all remote gems
+        end
+
+        # delete compact index cache
+        FileUtils.rm_rf home(".bundle/cache/compact_index")
+
+        bundle "install", artifice: "compact_index", env: { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+
+        expect(the_bundle).to include_gems "foo 1.0.0 x86_64-linux"
+      end
+    end
+
     it "does not reinstall already-installed gems" do
       install_gemfile <<-G
         source "#{file_uri_for(gem_repo1)}"