Fix Ruby version conflict error detection for new Bundler versions

bundler/lib/dependabot/bundler/file_updater/lockfile_updater.rb

@@ -16,7 +16,6 @@ class LockfileUpdater
         require_relative "gemspec_updater"
         require_relative "gemspec_sanitizer"
         require_relative "gemspec_dependency_name_finder"
-        require_relative "ruby_requirement_setter"
 
         LOCKFILE_ENDING =
           /(?<ending>\s*(?:RUBY VERSION|BUNDLED WITH).*)/m.freeze
@@ -80,23 +79,10 @@ def build_updated_lockfile
               )
             end
           post_process_lockfile(lockfile_body)
-        rescue SharedHelpers::HelperSubprocessFailed => e
-          raise unless ruby_lock_error?(e)
-
-          @dont_lock_ruby_version = true
-          retry
-        end
-
-        def ruby_lock_error?(error)
-          return false unless error.error_class == "Bundler::VersionConflict"
-          return false unless error.message.include?(" for gem \"ruby\0\"")
-          return false if @dont_lock_ruby_version
-
-          dependency_files.any? { |f| f.name.end_with?(".gemspec") }
         end
 
         def write_temporary_dependency_files
-          File.write(gemfile.name, prepared_gemfile_content(gemfile))
+          File.write(gemfile.name, updated_gemfile_content(gemfile))
           File.write(lockfile.name, sanitized_lockfile_body)
 
           top_level_gemspecs.each do |gemspec|
@@ -236,21 +222,6 @@ def replacement_version_for_gemspec(gemspec_content)
         end
         # rubocop:enable Metrics/PerceivedComplexity
 
-        def prepared_gemfile_content(file)
-          content =
-            GemfileUpdater.new(
-              dependencies: dependencies,
-              gemfile: file
-            ).updated_gemfile_content
-          return content if @dont_lock_ruby_version
-
-          top_level_gemspecs.each do |gs|
-            content = RubyRequirementSetter.new(gemspec: gs).rewrite(content)
-          end
-
-          content
-        end
-
         def updated_gemfile_content(file)
           GemfileUpdater.new(
             dependencies: dependencies,

bundler/lib/dependabot/bundler/update_checker/version_resolver.rb

@@ -139,7 +139,8 @@ def error_due_to_restrictive_upper_bound?(error)
         end
 
         def ruby_lock_error?(error)
-          return false unless error.message.include?(" for gem \"ruby\0\"")
+          return false unless error.message.include?(" for the Ruby\0 version") || # Bundler 2
+                              error.message.include?(" for gem \"ruby\0\"") # Bundler 1
           return false if @gemspec_ruby_unlocked
 
           dependency_files.any? { |f| f.name.end_with?(".gemspec") }

bundler/spec/dependabot/bundler/update_checker/version_resolver_spec.rb

@@ -462,15 +462,15 @@
             to eq(Gem::Version.new("2.0.1"))
         end
 
-        context "that isn't satisfied by the dependencies", :bundler_v2_only do
+        context "that isn't satisfied by the dependencies" do
           let(:dependency_files) do
             bundler_project_dependency_files("imports_gemspec_version_clash_old_required_ruby_no_lockfile")
           end
           let(:current_version) { "3.0.1" }
 
-          it "raises a DependencyFileNotResolvable error" do
-            expect { subject }.
-              to raise_error(Dependabot::DependencyFileNotResolvable)
+          it "ignores the minimum ruby version in the gemspec" do
+            expect(resolver.latest_resolvable_version_details[:version]).
+              to eq(Gem::Version.new("7.2.0"))
           end
         end
       end