Fix a bug where forking a project from a repository storage to another would fail

CHANGELOG

@@ -21,6 +21,7 @@ v 8.10.2 (unreleased)
   - Fix backup restore. !5459
   - Rescue Rugged::OSError (lock exists) when creating references. !5497
   - Disable MySQL foreign key checks before dropping all tables. !5472
+  - Fix a bug where forking a project from a repository storage to another would fail
   - Show release notes in tags list
   - Use project ID in repository cache to prevent stale data from persisting across projects. !5460
   - Ensure relative paths for video are rewritten as we do for images. !5474

GITLAB_SHELL_VERSION

-3.2.0
+3.2.1

app/models/project.rb

@@ -451,7 +451,9 @@ class Project < ActiveRecord::Base
   def add_import_job
     if forked?
-      job_id = RepositoryForkWorker.perform_async(self.id, forked_from_project.path_with_namespace, self.namespace.path)
+      job_id = RepositoryForkWorker.perform_async(id, forked_from_project.repository_storage_path,
+                                                  forked_from_project.path_with_namespace,
+                                                  self.namespace.path)
     else
       job_id = RepositoryImportWorker.perform_async(self.id)
     end

app/workers/repository_fork_worker.rb

@@ -4,7 +4,7 @@ class RepositoryForkWorker
   sidekiq_options queue: :gitlab_shell
-  def perform(project_id, source_path, target_path)
+  def perform(project_id, forked_from_repository_storage_path, source_path, target_path)
     project = Project.find_by_id(project_id)
     unless project.present?
@@ -12,7 +12,8 @@ class RepositoryForkWorker
       return
     end
-    result = gitlab_shell.fork_repository(project.repository_storage_path, source_path, target_path)
+    result = gitlab_shell.fork_repository(forked_from_repository_storage_path, source_path,
+                                          project.repository_storage_path, target_path)
     unless result
       logger.error("Unable to fork project #{project_id} for repository #{source_path} -> #{target_path}")
       project.mark_import_as_failed('The project could not be forked.')

lib/gitlab/backend/shell.rb

@@ -60,16 +60,18 @@ module Gitlab
     end
     # Fork repository to new namespace
-    # storage - project's storage path
+    # forked_from_storage - forked-from project's storage path
     # path - project path with namespace
+    # forked_to_storage - forked-to project's storage path
     # fork_namespace - namespace for forked project
     #
     # Ex.
-    #  fork_repository("/path/to/storage", "gitlab/gitlab-ci", "randx")
+    #  fork_repository("/path/to/forked_from/storage", "gitlab/gitlab-ci", "/path/to/forked_to/storage", "randx")
     #
-    def fork_repository(storage, path, fork_namespace)
+    def fork_repository(forked_from_storage, path, forked_to_storage, fork_namespace)
       Gitlab::Utils.system_silent([gitlab_shell_projects_path, 'fork-project',
-                                   storage, "#{path}.git", fork_namespace])
+                                   forked_from_storage, "#{path}.git", forked_to_storage,
+                                   fork_namespace])
     end
     # Remove repository from file system

spec/models/project_spec.rb

@@ -1244,6 +1244,32 @@ describe Project, models: true do
     end
   end
+  describe '#add_import_job' do
+    context 'forked' do
+      let(:forked_project_link) { create(:forked_project_link) }
+      let(:forked_from_project) { forked_project_link.forked_from_project }
+      let(:project) { forked_project_link.forked_to_project }
+
+      it 'schedules a RepositoryForkWorker job' do
+        expect(RepositoryForkWorker).to receive(:perform_async).
+          with(project.id, forked_from_project.repository_storage_path,
+              forked_from_project.path_with_namespace, project.namespace.path)
+
+        project.add_import_job
+      end
+    end
+
+    context 'not forked' do
+      let(:project) { create(:project) }
+
+      it 'schedules a RepositoryImportWorker job' do
+        expect(RepositoryImportWorker).to receive(:perform_async).with(project.id)
+
+        project.add_import_job
+      end
+    end
+  end
+
   describe '.where_paths_in' do
     context 'without any paths' do
       it 'returns an empty relation' do

spec/workers/repository_fork_worker_spec.rb

@@ -14,21 +14,24 @@ describe RepositoryForkWorker do
   describe "#perform" do
     it "creates a new repository from a fork" do
       expect(shell).to receive(:fork_repository).with(
-        project.repository_storage_path,
+        '/test/path',
         project.path_with_namespace,
+        project.repository_storage_path,
         fork_project.namespace.path
       ).and_return(true)
       subject.perform(
         project.id,
+        '/test/path',
         project.path_with_namespace,
         fork_project.namespace.path)
     end
     it 'flushes various caches' do
       expect(shell).to receive(:fork_repository).with(
-        project.repository_storage_path,
+        '/test/path',
         project.path_with_namespace,
+        project.repository_storage_path,
         fork_project.namespace.path
       ).and_return(true)
@@ -38,7 +41,7 @@ describe RepositoryForkWorker do
       expect_any_instance_of(Repository).to receive(:expire_exists_cache).
         and_call_original
-      subject.perform(project.id, project.path_with_namespace,
+      subject.perform(project.id, '/test/path', project.path_with_namespace,
                       fork_project.namespace.path)
     end
@@ -49,6 +52,7 @@ describe RepositoryForkWorker do
       subject.perform(
         project.id,
+        '/test/path',
         project.path_with_namespace,
         fork_project.namespace.path)
     end