Fix failing importer test case on MySQL due to missing trailing slash in root path

lib/gitlab/bare_repository_import/repository.rb

@@ -34,8 +34,11 @@ module Gitlab
       private
 
       def repo_relative_path
+        absolute_path = Pathname.new(repo_path)
+        project_root = Pathname.new(@root_path)
+
         # Remove root path and `.git` at the end
-        repo_path[@root_path.size...-4]
+        absolute_path.relative_path_from(project_root).to_s.gsub(/\.git$/, '')
       end
     end
   end

spec/lib/gitlab/bare_repository_import/importer_spec.rb

@@ -134,8 +134,12 @@ describe Gitlab::BareRepositoryImport::Importer, repository: true do
     end
 
     it 'moves an existing project to the correct path' do
+      # This is a quick way to get a valid repository instead of copying an existing one
       project = create(:project, :repository)
       original_commit_count = project.repository.commit_count
+      # We need to destroy the model but keep the repository so that the
+      # importer will attempt to load the repository
+      project.destroy
 
       bare_repo = Gitlab::BareRepositoryImport::Repository.new(project.repository_storage_path, project.repository.path)
       gitlab_importer = described_class.new(admin, bare_repo)

spec/lib/gitlab/bare_repository_import/repository_spec.rb

@@ -46,6 +46,13 @@ describe ::Gitlab::BareRepositoryImport::Repository do
   describe '#project_full_path' do
     it 'returns the project full path' do
       expect(project_repo_path.repo_path).to eq('/full/path/to/repo.git')
+      expect(project_repo_path.project_full_path).to eq('to/repo')
+    end
+
+    it 'with no trailing slash in the root path' do
+      repo_path = described_class.new('/full/path', '/full/path/to/repo.git')
+
+      expect(repo_path.project_full_path).to eq('to/repo')
     end
   end
 end