Merge branch 'bvl-unlink-fixes' into 'master'

This fixes some bugs related to forked projects of which the source was deleted.

Closes #39667

See merge request gitlab-org/gitlab-ce!15150

6 files changed, 136 insertions, 0 deletions

diff --git a/spec/controllers/concerns/lfs_request_spec.rb b/spec/controllers/concerns/lfs_request_spec.rb
new file mode 100644
index 00000000000..33b23db302a
--- /dev/null
+++ b/spec/controllers/concerns/lfs_request_spec.rb
@@ -0,0 +1,50 @@
+require 'spec_helper'
+
+describe LfsRequest do
+  include ProjectForksHelper
+
+  controller(Projects::GitHttpClientController) do
+    # `described_class` is not available in this context
+    include LfsRequest # rubocop:disable RSpec/DescribedClass
+
+    def show
+      storage_project
+
+      render nothing: true
+    end
+
+    def project
+      @project ||= Project.find(params[:id])
+    end
+
+    def download_request?
+      true
+    end
+
+    def ci?
+      false
+    end
+  end
+
+  let(:project) { create(:project, :public) }
+
+  before do
+    stub_lfs_setting(enabled: true)
+  end
+
+  describe '#storage_project' do
+    it 'assigns the project as storage project' do
+      get :show, id: project.id
+
+      expect(assigns(:storage_project)).to eq(project)
+    end
+
+    it 'assigns the source of a forked project' do
+      forked_project = fork_project(project)
+
+      get :show, id: forked_project.id
+
+      expect(assigns(:storage_project)).to eq(project)
+    end
+  end
+end
diff --git a/spec/features/projects/settings/forked_project_settings_spec.rb b/spec/features/projects/settings/forked_project_settings_spec.rb
new file mode 100644
index 00000000000..28954a4fb40
--- /dev/null
+++ b/spec/features/projects/settings/forked_project_settings_spec.rb
@@ -0,0 +1,40 @@
+require 'spec_helper'
+
+feature 'Settings for a forked project', :js do
+  include ProjectForksHelper
+  let(:user) { create(:user) }
+  let(:original_project) { create(:project) }
+  let(:forked_project) { fork_project(original_project, user) }
+
+  before do
+    original_project.add_master(user)
+    forked_project.add_master(user)
+    sign_in(user)
+  end
+
+  shared_examples 'project settings for a forked projects' do
+    it 'allows deleting the link to the forked project' do
+      visit edit_project_path(forked_project)
+
+      click_button 'Remove fork relationship'
+
+      wait_for_requests
+
+      fill_in('confirm_name_input', with: forked_project.name)
+      click_button('Confirm')
+
+      expect(page).to have_content('The fork relationship has been removed.')
+      expect(forked_project.reload.forked?).to be_falsy
+    end
+  end
+
+  it_behaves_like 'project settings for a forked projects'
+
+  context 'when the original project is deleted' do
+    before do
+      original_project.destroy!
+    end
+
+    it_behaves_like 'project settings for a forked projects'
+  end
+end
diff --git a/spec/models/fork_network_spec.rb b/spec/models/fork_network_spec.rb
index 605ccd6db06..a43baf1820a 100644
--- a/spec/models/fork_network_spec.rb
+++ b/spec/models/fork_network_spec.rb
@@ -24,6 +24,16 @@ describe ForkNetwork do
     end
   end
 
+  describe '#merge_requests' do
+    it 'finds merge requests within the fork network' do
+      project = create(:project)
+      forked_project = fork_project(project)
+      merge_request = create(:merge_request, source_project: forked_project, target_project: project)
+
+      expect(project.fork_network.merge_requests).to include(merge_request)
+    end
+  end
+
   context 'for a deleted project' do
     it 'keeps the fork network' do
       project = create(:project, :public)
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index ed6e42d476e..e8588975118 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -1923,6 +1923,20 @@ describe Project do
         expect(forked_project.in_fork_network_of?(other_project)).to be_falsy
       end
     end
+
+    describe '#fork_source' do
+      let!(:second_fork) { fork_project(forked_project) }
+
+      it 'returns the direct source if it exists' do
+        expect(second_fork.fork_source).to eq(forked_project)
+      end
+
+      it 'returns the root of the fork network when the directs source was deleted' do
+        forked_project.destroy
+
+        expect(second_fork.fork_source).to eq(project)
+      end
+    end
   end
 
   describe '#pushes_since_gc' do
diff --git a/spec/services/projects/unlink_fork_service_spec.rb b/spec/services/projects/unlink_fork_service_spec.rb
index 50d3a4ec982..2bba71fef4f 100644
--- a/spec/services/projects/unlink_fork_service_spec.rb
+++ b/spec/services/projects/unlink_fork_service_spec.rb
@@ -12,6 +12,9 @@ describe Projects::UnlinkForkService do
 
   context 'with opened merge request on the source project' do
     let(:merge_request) { create(:merge_request, source_project: forked_project, target_project: fork_link.forked_from_project) }
+    let(:merge_request2) { create(:merge_request, source_project: forked_project, target_project: fork_project(project)) }
+    let(:merge_request_in_fork) { create(:merge_request, source_project: forked_project, target_project: forked_project) }
+
     let(:mr_close_service) { MergeRequests::CloseService.new(forked_project, user) }
 
     before do
@@ -22,9 +25,14 @@ describe Projects::UnlinkForkService do
 
     it 'close all pending merge requests' do
       expect(mr_close_service).to receive(:execute).with(merge_request)
+      expect(mr_close_service).to receive(:execute).with(merge_request2)
 
       subject.execute
     end
+
+    it 'does not close merge requests for the project being unlinked' do
+      expect(mr_close_service).not_to receive(:execute).with(merge_request_in_fork)
+    end
   end
 
   it 'remove fork relation' do
@@ -53,4 +61,14 @@ describe Projects::UnlinkForkService do
 
     expect(source.forks_count).to be_zero
   end
+
+  context 'when the original project was deleted' do
+    it 'does not fail when the original project is deleted' do
+      source = forked_project.forked_from_project
+      source.destroy
+      forked_project.reload
+
+      expect { subject.execute }.not_to raise_error
+    end
+  end
 end
diff --git a/spec/support/stub_configuration.rb b/spec/support/stub_configuration.rb
index 4d448a55978..4ead78529c3 100644
--- a/spec/support/stub_configuration.rb
+++ b/spec/support/stub_configuration.rb
@@ -38,6 +38,10 @@ module StubConfiguration
     allow(Gitlab.config.backup).to receive_messages(to_settings(messages))
   end
 
+  def stub_lfs_setting(messages)
+    allow(Gitlab.config.lfs).to receive_messages(to_settings(messages))
+  end
+
   def stub_storage_settings(messages)
     # Default storage is always required
     messages['default'] ||= Gitlab.config.repositories.storages.default