Fix resources with PBXVariantGroups outside of a resource bundle

CHANGELOG.md

@@ -12,6 +12,11 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 
 ##### Bug Fixes
 
+* Fix build phase resource references to point at PBXVariantGroups where relevant.  
+  [Wes Campaigne](https://github.com/Westacular)
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#6373](https://github.com/CocoaPods/CocoaPods/issues/6373)
+
 * Add `--skip-import-validation` to skip linking a pod during lint.  
   [Samuel Giddins](https://github.com/segiddins)
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)

lib/cocoapods/installer/xcode/pods_project_generator/pod_target_installer.rb

@@ -65,6 +65,31 @@ module Pod
             settings
           end
 
+          # Filters the given resource file references discarding empty paths which are
+          # added by their parent directory. This will also include references to the parent [PBXVariantGroup]
+          # for all resources underneath it.
+          #
+          # @param  Array[<Pathname>] resource_file_references
+          #         The array of all resource file references to filter.
+
+          # @return [Array<Pathname>] The filtered resource file references.
+          #
+          def filter_resource_file_references(resource_file_references)
+            resource_file_references.map do |resource_file_reference|
+              ref = project.reference_for_path(resource_file_reference)
+
+              # Some nested files are not directly present in the Xcode project, such as the contents
+              # of an .xcdatamodeld directory. These files are implicitly included by including their
+              # parent directory.
+              next if ref.nil?
+
+              # For variant groups, the variant group itself is added, not its members.
+              next ref.parent if ref.parent.is_a?(Xcodeproj::Project::Object::PBXVariantGroup)
+
+              ref
+            end
+          end
+
           #-----------------------------------------------------------------------#
 
           SOURCE_FILE_EXTENSIONS = Sandbox::FileAccessor::SOURCE_FILE_EXTENSIONS
@@ -111,13 +136,7 @@ module Pod
 
               next unless target.requires_frameworks?
 
-              resource_refs = file_accessor.resources.flatten.map do |res|
-                project.reference_for_path(res)
-              end
-
-              # Some nested files are not directly present in the Xcode project, such as the contents
-              # of an .xcdatamodeld directory. These files will return nil file references.
-              resource_refs.compact!
+              resource_refs = filter_resource_file_references(file_accessor.resources.flatten).compact
 
               native_target.add_resources(resource_refs)
             end
@@ -138,19 +157,7 @@ module Pod
           def add_resources_bundle_targets
             target.file_accessors.each do |file_accessor|
               file_accessor.resource_bundles.each do |bundle_name, paths|
-                file_references = paths.map do |path|
-                  ref = project.reference_for_path(path)
-
-                  # Some nested files are not directly present in the Xcode project, such as the contents
-                  # of an .xcdatamodeld directory. These files are implicitly included by including their
-                  # parent directory.
-                  next if ref.nil?
-
-                  # For variant groups, the variant group itself is added, not its members.
-                  next ref.parent if ref.parent.is_a?(Xcodeproj::Project::Object::PBXVariantGroup)
-
-                  ref
-                end
+                file_references = filter_resource_file_references(paths)
                 file_references = file_references.uniq.compact
 
                 label = target.resources_bundle_target_label(bundle_name)

spec/unit/installer/xcode/pods_project_generator/pod_target_installer_spec.rb

@@ -545,6 +545,50 @@ module Pod
               end
             end
 
+            describe 'concerning resources' do
+              before do
+                config.sandbox.prepare
+
+                @project = Project.new(config.sandbox.project_path)
+
+                config.sandbox.project = @project
+
+                @spec = fixture_spec('banana-lib/BananaLib.podspec')
+                @spec.resources = ['Resources/**/*']
+                @spec.resource_bundle = nil
+                @project.add_pod_group('BananaLib', fixture('banana-lib'))
+
+                @pod_target = fixture_pod_target(@spec)
+                @pod_target.stubs(:requires_frameworks? => true)
+                @pod_target.user_build_configurations = { 'Debug' => :debug, 'Release' => :release }
+                target_installer = PodTargetInstaller.new(config.sandbox, @pod_target)
+
+                # Use a file references installer to add the files so that the correct ones are added.
+                file_ref_installer = Installer::Xcode::PodsProjectGenerator::FileReferencesInstaller.new(config.sandbox, [@pod_target], @project)
+                file_ref_installer.install!
+
+                target_installer.install!
+              end
+
+              it 'adds variant groups directly to resources' do
+                native_target = @project.targets.first
+
+                # The variant group item should be present.
+                group_build_file = native_target.resources_build_phase.files.find do |bf|
+                  bf.file_ref.path == 'Resources' && bf.file_ref.name == 'Main.storyboard'
+                end
+
+                group_build_file.should.be.not.nil
+                group_build_file.file_ref.is_a?(Xcodeproj::Project::Object::PBXVariantGroup).should.be.true
+
+                # An item within the variant group should not be present.
+                strings_build_file = native_target.resources_build_phase.files.find do |bf|
+                  bf.file_ref.path == 'Resources/en.lproj/Main.strings'
+                end
+                strings_build_file.should.be.nil
+              end
+            end
+
             describe 'concerning resource bundles' do
               before do
                 config.sandbox.prepare
@@ -572,7 +616,7 @@ module Pod
                 @bundle_target.should.be.not.nil
               end
 
-              it 'adds variant groups directly to resources' do
+              it 'adds variant groups directly to resource bundle' do
                 # The variant group item should be present.
                 group_build_file = @bundle_target.resources_build_phase.files.find do |bf|
                   bf.file_ref.path == 'Resources' && bf.file_ref.name == 'Main.storyboard'
@@ -587,7 +631,7 @@ module Pod
                 strings_build_file.should.be.nil
               end
 
-              it 'adds Core Data models directly to resources' do
+              it 'adds Core Data models directly to resource bundle' do
                 # The model directory item should be present.
                 dir_build_file = @bundle_target.resources_build_phase.files.find { |bf| bf.file_ref.path == 'Resources/Sample.xcdatamodeld' }
                 dir_build_file.should.be.not.nil