[ruby/rubygems] Honor metadata overrides in MatchMetadata

matches_current_ruby? / matches_current_rubygems? now look up the
current Definition's overrides via Bundler.overrides and apply them
before checking against the runtime Ruby/RubyGems version. This
covers Installer#ensure_specs_are_compatible! and the materialize-
layer choose_compatible / SpecSet#valid? checks uniformly without
plumbing overrides through every materialization site.

When no Definition is set yet (e.g. RubyGems-side calls outside a
Bundler.definition block), Bundler.overrides returns an empty list
and the methods fall through to their original behavior.

https://github.com/ruby/rubygems/commit/afe9313b6e

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2 files changed, 23 insertions, 2 deletions

diff --git a/lib/bundler.rb b/lib/bundler.rb
index 12dde90fc5..c686b106c7 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -244,6 +244,11 @@ module Bundler
       Bundler.settings[:deployment]
     end
 
+    def overrides
+      return [] unless defined?(@definition) && @definition
+      @definition.overrides
+    end
+
     def locked_gems
       @locked_gems ||=
         if defined?(@definition) && @definition
diff --git a/lib/bundler/match_metadata.rb b/lib/bundler/match_metadata.rb
index 6fd2994a85..75b0e4357c 100644
--- a/lib/bundler/match_metadata.rb
+++ b/lib/bundler/match_metadata.rb
@@ -7,11 +7,11 @@ module Bundler
     end
 
     def matches_current_ruby?
-      @required_ruby_version.satisfied_by?(Gem.ruby_version)
+      effective_required_ruby_version.satisfied_by?(Gem.ruby_version)
     end
 
     def matches_current_rubygems?
-      @required_rubygems_version.satisfied_by?(Gem.rubygems_version)
+      effective_required_rubygems_version.satisfied_by?(Gem.rubygems_version)
     end
 
     def expanded_dependencies
@@ -26,5 +26,21 @@ module Bundler
 
       Gem::Dependency.new("#{name}\0", requirement)
     end
+
+    private
+
+    def effective_required_ruby_version
+      apply_metadata_override(@required_ruby_version, :required_ruby_version)
+    end
+
+    def effective_required_rubygems_version
+      apply_metadata_override(@required_rubygems_version, :required_rubygems_version)
+    end
+
+    def apply_metadata_override(requirement, field)
+      override = Override.find_for(Bundler.overrides, name, field)
+      return requirement unless override
+      override.apply_to(requirement)
+    end
   end
 end