[rubygems/rubygems] Don't check for circular deps on full index sources

https://github.com/rubygems/rubygems/commit/d275cdccb1

lib/bundler/resolver.rb

@@ -37,8 +37,16 @@ module Bundler
       root_version = Resolver::Candidate.new(0)
 
       @all_specs = Hash.new do |specs, name|
-        matches = source_for(name).specs.search(name)
-        matches = filter_invalid_self_dependencies(matches, name)
+        source = source_for(name)
+        matches = source.specs.search(name)
+
+        # Don't bother to check for circular deps when no dependency API are
+        # available, since it's too slow to be usable. That edge case won't work
+        # but resolution other than that should work fine and reasonably fast.
+        if source.respond_to?(:dependency_api_available?) && source.dependency_api_available?
+          matches = filter_invalid_self_dependencies(matches, name)
+        end
+
         specs[name] = matches.sort_by {|s| [s.version, s.platform.to_s] }
       end
 

spec/bundler/resolver/basic_spec.rb

@@ -347,4 +347,27 @@ RSpec.describe "Resolving" do
 
     should_resolve_as %w[rack-3.0.0 standalone_migrations-1.0.13]
   end
+
+  it "does not ignore versions that incorrectly depend on themselves when dependency_api is not available" do
+    @index = build_index do
+      gem "rack", "3.0.0"
+
+      gem "standalone_migrations", "7.1.0" do
+        dep "rack", "~> 2.0"
+      end
+
+      gem "standalone_migrations", "2.0.4" do
+        dep "standalone_migrations", ">= 2.0.5"
+      end
+
+      gem "standalone_migrations", "1.0.13" do
+        dep "rack", ">= 0"
+      end
+    end
+
+    dep "rack", "~> 3.0"
+    dep "standalone_migrations"
+
+    should_resolve_without_dependency_api %w[rack-3.0.0 standalone_migrations-2.0.4]
+  end
 end

spec/bundler/support/indexes.rb

@@ -14,9 +14,9 @@ module Spec
 
     alias_method :platforms, :platform
 
-    def resolve(args = [])
+    def resolve(args = [], dependency_api_available: true)
       @platforms ||= ["ruby"]
-      default_source = instance_double("Bundler::Source::Rubygems", :specs => @index, :to_s => "locally install gems")
+      default_source = instance_double("Bundler::Source::Rubygems", :specs => @index, :to_s => "locally install gems", :dependency_api_available? => dependency_api_available)
       source_requirements = { :default => default_source }
       base = args[0] || Bundler::SpecSet.new([])
       base.each {|ls| ls.source = default_source }
@@ -41,6 +41,12 @@ module Spec
       expect(got).to eq(specs.sort)
     end
 
+    def should_resolve_without_dependency_api(specs)
+      got = resolve(:dependency_api_available => false)
+      got = got.map(&:full_name).sort
+      expect(got).to eq(specs.sort)
+    end
+
     def should_resolve_and_include(specs, args = [])
       got = resolve(args)
       got = got.map(&:full_name).sort