1 files changed, 107 insertions, 0 deletions
diff --git a/lib/bundler/stub_specification.rb b/lib/bundler/stub_specification.rb
new file mode 100644
index 0000000000..aeacf245a3
--- /dev/null
+++ b/lib/bundler/stub_specification.rb
@@ -0,0 +1,107 @@
+# frozen_string_literal: true
+require "bundler/remote_specification"
+
+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
+
+    attr_accessor :stub, :ignored
+
+    # Pre 2.2.0 did not include extension_dir
+    # https://github.com/rubygems/rubygems/commit/9485ca2d101b82a946d6f327f4bdcdea6d4946ea
+    if Bundler.rubygems.provides?(">= 2.2.0")
+      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)
+        path = File.join(stub.extensions_dir, source.extension_dir_name)
+        stub.extension_dir = File.expand_path(path)
+      end
+    end
+
+    def to_yaml
+      _remote_specification.to_yaml
+    end
+
+    # @!group Stub Delegates
+
+    if Bundler.rubygems.provides?(">= 2.3")
+      # This is defined directly to avoid having to load every installed spec
+      def missing_extensions?
+        stub.missing_extensions?
+      end
+    end
+
+    def activated
+      stub.activated
+    end
+
+    def activated=(activated)
+      stub.instance_variable_set(:@activated, activated)
+    end
+
+    def default_gem
+      stub.default_gem
+    end
+
+    def full_gem_path
+      # deleted gems can have their stubs return nil, so in that case grab the
+      # expired path from the full spec
+      stub.full_gem_path || method_missing(:full_gem_path)
+    end
+
+    if Bundler.rubygems.provides?(">= 2.2.0")
+      def full_require_paths
+        stub.full_require_paths
+      end
+
+      # This is what we do in bundler/rubygems_ext
+      # full_require_paths is always implemented in >= 2.2.0
+      def load_paths
+        full_require_paths
+      end
+    end
+
+    def loaded_from
+      stub.loaded_from
+    end
+
+    if Bundler.rubygems.stubs_provide_full_functionality?
+      def matches_for_glob(glob)
+        stub.matches_for_glob(glob)
+      end
+    end
+
+    def raw_require_paths
+      stub.raw_require_paths
+    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
+      end
+    end
+  end
+end