1 files changed, 67 insertions, 0 deletions
diff --git a/lib/bundler/source/metadata.rb b/lib/bundler/source/metadata.rb
new file mode 100644
index 0000000000..ecf8895187
--- /dev/null
+++ b/lib/bundler/source/metadata.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+module Bundler
+  class Source
+    class Metadata < Source
+      def specs
+        @specs ||= Index.build do |idx|
+          idx << Gem::Specification.new("Ruby\0", Bundler::RubyVersion.system.gem_version)
+          idx << Gem::Specification.new("RubyGems\0", Gem::VERSION) do |s|
+            s.required_rubygems_version = Gem::Requirement.default
+          end
+
+          if local_spec = Gem.loaded_specs["bundler"]
+            raise CorruptBundlerInstallError.new(local_spec) if local_spec.version.to_s != Bundler::VERSION
+
+            idx << local_spec
+          else
+            idx << Gem::Specification.new do |s|
+              s.name     = "bundler"
+              s.version  = VERSION
+              s.license  = "MIT"
+              s.platform = Gem::Platform::RUBY
+              s.authors  = ["bundler team"]
+              s.bindir   = "exe"
+              s.homepage = "https://bundler.io"
+              s.summary  = "The best way to manage your application's dependencies"
+              s.executables = %w[bundle bundler]
+              s.loaded_from = SharedHelpers.gemspec_path
+            end
+          end
+
+          idx.each {|s| s.source = self }
+        end
+      end
+
+      def options
+        {}
+      end
+
+      def install(spec, _opts = {})
+        print_using_message "Using #{version_message(spec)}"
+        nil
+      end
+
+      def to_s
+        "the local ruby installation"
+      end
+
+      def ==(other)
+        self.class == other.class
+      end
+      alias_method :eql?, :==
+
+      def hash
+        self.class.hash
+      end
+
+      def version_message(spec)
+        "#{spec.name} #{spec.version}"
+      end
+
+      def checksum_store
+        @checksum_store ||= Checksum::Store.new
+      end
+    end
+  end
+end