1 files changed, 86 insertions, 0 deletions
diff --git a/lib/rubygems/resolver/lock_specification.rb b/lib/rubygems/resolver/lock_specification.rb
new file mode 100644
index 0000000000..06f912dd85
--- /dev/null
+++ b/lib/rubygems/resolver/lock_specification.rb
@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+##
+# The LockSpecification comes from a lockfile (Gem::RequestSet::Lockfile).
+#
+# A LockSpecification's dependency information is pre-filled from the
+# lockfile.
+
+class Gem::Resolver::LockSpecification < Gem::Resolver::Specification
+  attr_reader :sources
+
+  def initialize(set, name, version, sources, platform)
+    super()
+
+    @name     = name
+    @platform = platform
+    @set      = set
+    @source   = sources.first
+    @sources  = sources
+    @version  = version
+
+    @dependencies = []
+    @spec         = nil
+  end
+
+  ##
+  # This is a null install as a locked specification is considered installed.
+  # +options+ are ignored.
+
+  def install(options = {})
+    destination = options[:install_dir] || Gem.dir
+
+    if File.exist? File.join(destination, "specifications", spec.spec_name)
+      yield nil
+      return
+    end
+
+    super
+  end
+
+  ##
+  # Adds +dependency+ from the lockfile to this specification
+
+  def add_dependency(dependency) # :nodoc:
+    @dependencies << dependency
+  end
+
+  def pretty_print(q) # :nodoc:
+    q.group 2, "[LockSpecification", "]" do
+      q.breakable
+      q.text "name: #{@name}"
+
+      q.breakable
+      q.text "version: #{@version}"
+
+      unless @platform == Gem::Platform::RUBY
+        q.breakable
+        q.text "platform: #{@platform}"
+      end
+
+      unless @dependencies.empty?
+        q.breakable
+        q.text "dependencies:"
+        q.breakable
+        q.pp @dependencies
+      end
+    end
+  end
+
+  ##
+  # A specification constructed from the lockfile is returned
+
+  def spec
+    @spec ||= Gem::Specification.find do |spec|
+      spec.name == @name && spec.version == @version
+    end
+
+    @spec ||= Gem::Specification.new do |s|
+      s.name     = @name
+      s.version  = @version
+      s.platform = @platform
+
+      s.dependencies.concat @dependencies
+    end
+  end
+end