1 files changed, 147 insertions, 0 deletions
diff --git a/lib/bundler/stub_specification.rb b/lib/bundler/stub_specification.rb
new file mode 100644
index 0000000000..b353642b40
--- /dev/null
+++ b/lib/bundler/stub_specification.rb
@@ -0,0 +1,147 @@
+# frozen_string_literal: true
+
+module Bundler
+  class StubSpecification < RemoteSpecification
+    def self.from_stub(stub)
+      return stub if stub.is_a?(Bundler::StubSpecification)
+      spec = new(stub.name, stub.version, stub.platform, nil)
+      spec.stub = stub
+      spec
+    end
+
+    def insecurely_materialized?
+      false
+    end
+
+    attr_reader :checksum
+    attr_accessor :stub, :ignored
+
+    def source=(source)
+      super
+      # Stub has no concept of source, which means that extension_dir may be wrong
+      # This is the case for git-based gems. So, instead manually assign the extension dir
+      return unless source.respond_to?(:extension_dir_name)
+      unique_extension_dir = [source.extension_dir_name, File.basename(full_gem_path)].uniq.join("-")
+      path = File.join(stub.extensions_dir, unique_extension_dir)
+      stub.extension_dir = File.expand_path(path)
+    end
+
+    def to_yaml
+      _remote_specification.to_yaml
+    end
+
+    # @!group Stub Delegates
+
+    def ignored?
+      return @ignored unless @ignored.nil?
+
+      @ignored = missing_extensions?
+      return false unless @ignored
+
+      warn "Source #{source} is ignoring #{self} because it is missing extensions"
+
+      true
+    end
+
+    def manually_installed?
+      # This is for manually installed gems which are gems that were fixed in place after a
+      # failed installation. Once the issue was resolved, the user then manually created
+      # the gem specification using the instructions provided by `gem help install`
+      installed_by_version == Gem::Version.new(0)
+    end
+
+    # This is defined directly to avoid having to loading the full spec
+    def missing_extensions?
+      return false if RUBY_ENGINE == "jruby"
+      return false if default_gem?
+      return false if extensions.empty?
+      return false if File.exist? gem_build_complete_path
+      return false if manually_installed?
+
+      true
+    end
+
+    def activated?
+      stub.activated?
+    end
+
+    def activated=(activated)
+      stub.instance_variable_set(:@activated, activated)
+    end
+
+    def extensions
+      stub.extensions
+    end
+
+    def gem_build_complete_path
+      stub.gem_build_complete_path
+    end
+
+    def default_gem?
+      stub.default_gem?
+    end
+
+    def full_gem_path
+      stub.full_gem_path
+    end
+
+    def full_gem_path=(path)
+      stub.full_gem_path = path
+    end
+
+    def full_require_paths
+      stub.full_require_paths
+    end
+
+    def require_paths
+      stub.require_paths
+    end
+
+    def base_dir=(path)
+      stub.base_dir = path
+    end
+
+    def load_paths
+      full_require_paths
+    end
+
+    def loaded_from
+      stub.loaded_from
+    end
+
+    def matches_for_glob(glob)
+      stub.matches_for_glob(glob)
+    end
+
+    def raw_require_paths
+      stub.raw_require_paths
+    end
+
+    def inspect
+      "#<#{self.class} @name=\"#{name}\" (#{full_name.delete_prefix("#{name}-")})>"
+    end
+
+    private
+
+    def _remote_specification
+      @_remote_specification ||= begin
+        rs = stub.to_spec
+        if rs.equal?(self) # happens when to_spec gets the spec from Gem.loaded_specs
+          rs = Gem::Specification.load(loaded_from)
+          Bundler.rubygems.stub_set_spec(stub, rs)
+        end
+
+        unless rs
+          raise GemspecError, "The gemspec for #{full_name} at #{loaded_from}" \
+            " was missing or broken. Try running `gem pristine #{name} -v #{version}`" \
+            " to fix the cached spec."
+        end
+
+        rs.source = source
+        rs.base_dir = stub.base_dir
+
+        rs
+      end
+    end
+  end
+end