Add e2e test of push over SSH over Git protocol v2

Adds a new end-to-end test to check that Git protocol v2 can be used to
push over SSH.

Includes a change in Git::Repository to use Runtime::Env.debug? to
enable logging instead of .verbose?

qa/qa/git/repository.rb

@@ -109,6 +109,28 @@ module QA
         known_hosts_file.close(true)
       end
 
+      def push_with_git_protocol(version, file_name, file_content, commit_message = 'Initial commit')
+        self.git_protocol = version
+        add_file(file_name, file_content)
+        commit(commit_message)
+        push_changes
+
+        fetch_supported_git_protocol
+      end
+
+      def git_protocol=(value)
+        raise ArgumentError, "Please specify the protocol you would like to use: 0, 1, or 2" unless %w[0 1 2].include?(value.to_s)
+
+        run("git config protocol.version #{value}")
+      end
+
+      def fetch_supported_git_protocol
+        # ls-remote is one command known to respond to Git protocol v2 so we use
+        # it to get output including the version reported via Git tracing
+        output = run("git ls-remote #{uri}", "GIT_TRACE_PACKET=1")
+        output[/git< version (\d+)/, 1] || 'unknown'
+      end
+
       private
 
       attr_reader :uri, :username, :password, :known_hosts_file, :private_key_file
@@ -117,8 +139,8 @@ module QA
         !private_key_file.nil?
       end
 
-      def run(command_str)
-        command = [env_vars, command_str, '2>&1'].compact.join(' ')
+      def run(command_str, *extra_env)
+        command = [env_vars, *extra_env, command_str, '2>&1'].compact.join(' ')
         Runtime::Logger.debug "Git: command=[#{command}]"
 
         output, _ = Open3.capture2(command)

qa/qa/runtime/env.rb

@@ -7,6 +7,16 @@ module QA
 
       attr_writer :personal_access_token
 
+      # The environment variables used to indicate if the environment under test
+      # supports the given feature
+      SUPPORTED_FEATURES = {
+        git_protocol_v2: 'QA_CAN_TEST_GIT_PROTOCOL_V2'
+      }.freeze
+
+      def supported_features
+        SUPPORTED_FEATURES
+      end
+
       def debug?
         enabled?(ENV['QA_DEBUG'], default: false)
       end
@@ -104,6 +114,15 @@ module QA
         raise ArgumentError, "Please provide GITHUB_ACCESS_TOKEN"
       end
 
+      # Returns true if there is an environment variable that indicates that
+      # the feature is supported in the environment under test.
+      # All features are supported by default.
+      def can_test?(feature)
+        raise ArgumentError, %Q(Unknown feature "#{feature}") unless SUPPORTED_FEATURES.include? feature
+
+        enabled?(ENV[SUPPORTED_FEATURES[feature]], default: true)
+      end
+
       private
 
       def enabled?(value, default: true)

qa/qa/specs/features/browser_ui/3_create/repository/protocol_v2_push_ssh_spec.rb

+# frozen_string_literal: true
+
+module QA
+  context 'Create' do
+    describe 'Push over SSH using Git protocol version 2', :requires_git_protocol_v2 do
+      # Note: If you run this test against GDK make sure you've enabled sshd and
+      # enabled setting the Git protocol by adding `AcceptEnv GIT_PROTOCOL` to
+      # `sshd_config`
+      # See: https://gitlab.com/gitlab-org/gitlab-qa/blob/master/docs/run_qa_against_gdk.md
+
+      let(:key_title) { "key for ssh tests #{Time.now.to_f}" }
+      let(:ssh_key) do
+        Factory::Resource::SSHKey.fabricate! do |resource|
+          resource.title = key_title
+        end
+      end
+
+      def login
+        Runtime::Browser.visit(:gitlab, Page::Main::Login)
+        Page::Main::Login.perform(&:sign_in_using_credentials)
+      end
+
+      around do |example|
+        # Create an SSH key to be used with Git
+        login
+        ssh_key
+
+        example.run
+
+        # Remove the SSH key
+        login
+        Page::Main::Menu.perform(&:go_to_profile_settings)
+        Page::Profile::Menu.perform(&:click_ssh_keys)
+        Page::Profile::SSHKeys.perform do |ssh_keys|
+          ssh_keys.remove_key(key_title)
+        end
+      end
+
+      it 'user pushes to the repository' do
+        # Create a project to push to
+        project = Factory::Resource::Project.fabricate! do |project|
+          project.name = 'git-protocol-project'
+        end
+
+        file_name = 'README.md'
+        file_content = 'Test Git protocol v2'
+        git_protocol = '2'
+        git_protocol_reported = nil
+
+        # Use Git to clone the project, push a file to it, and then check the
+        # supported Git protocol
+        Git::Repository.perform do |repository|
+          username = 'GitLab QA'
+          email = 'root@gitlab.com'
+
+          repository.uri = project.repository_ssh_location.uri
+
+          begin
+            repository.use_ssh_key(ssh_key)
+            repository.clone
+            repository.configure_identity(username, email)
+
+            git_protocol_reported = repository.push_with_git_protocol(
+              git_protocol,
+              file_name,
+              file_content)
+          ensure
+            repository.delete_ssh_key
+          end
+        end
+
+        project.visit!
+        Page::Project::Show.perform(&:wait_for_push)
+
+        # Check that the push worked
+        expect(page).to have_content(file_name)
+        expect(page).to have_content(file_content)
+
+        # And check that the correct Git protocol was used
+        expect(git_protocol_reported).to eq(git_protocol)
+      end
+    end
+  end
+end

qa/qa/specs/runner.rb

@@ -25,6 +25,10 @@ module QA
 
         args.push(%w[--tag ~skip_signup_disabled]) if QA::Runtime::Env.signup_disabled?
 
+        QA::Runtime::Env.supported_features.each_key do |key|
+          args.push(["--tag", "~requires_#{key}"]) unless QA::Runtime::Env.can_test? key
+        end
+
         args.push(options)
         args.push(DEFAULT_TEST_PATH_ARGS) unless options.any? { |opt| opt =~ %r{/features/} }
 

qa/spec/git/repository_spec.rb

@@ -26,6 +26,36 @@ describe QA::Git::Repository do
     end
   end
 
+  describe '#git_protocol=' do
+    [0, 1, 2].each do |version|
+      it "configures git to use protocol version #{version}" do
+        expect(repository).to receive(:run).with("git config protocol.version #{version}")
+        repository.git_protocol = version
+      end
+    end
+
+    it 'raises an error if the version is unsupported' do
+      expect { repository.git_protocol = 'foo' }.to raise_error(ArgumentError, "Please specify the protocol you would like to use: 0, 1, or 2")
+    end
+  end
+
+  describe '#fetch_supported_git_protocol' do
+    it "reports the detected version" do
+      expect(repository).to receive(:run).and_return("packet: git< version 2")
+      expect(repository.fetch_supported_git_protocol).to eq('2')
+    end
+
+    it 'reports unknown if version is unknown' do
+      expect(repository).to receive(:run).and_return("packet: git< version -1")
+      expect(repository.fetch_supported_git_protocol).to eq('unknown')
+    end
+
+    it 'reports unknown if content does not identify a version' do
+      expect(repository).to receive(:run).and_return("foo")
+      expect(repository.fetch_supported_git_protocol).to eq('unknown')
+    end
+  end
+
   def cd_empty_temp_directory
     tmp_dir = 'tmp/git-repository-spec/'
     FileUtils.rm_rf(tmp_dir) if ::File.exist?(tmp_dir)

qa/spec/runtime/env_spec.rb

@@ -3,49 +3,62 @@
 describe QA::Runtime::Env do
   include Support::StubENV
 
-  shared_examples 'boolean method' do |method, env_key, default|
+  shared_examples 'boolean method' do |**kwargs|
+    it_behaves_like 'boolean method with parameter', kwargs
+  end
+
+  shared_examples 'boolean method with parameter' do |method:, param: nil, env_key:, default:|
     context 'when there is an env variable set' do
       it 'returns false when falsey values specified' do
         stub_env(env_key, 'false')
-        expect(described_class.public_send(method)).to be_falsey
+        expect(described_class.public_send(method, *param)).to be_falsey
 
         stub_env(env_key, 'no')
-        expect(described_class.public_send(method)).to be_falsey
+        expect(described_class.public_send(method, *param)).to be_falsey
 
         stub_env(env_key, '0')
-        expect(described_class.public_send(method)).to be_falsey
+        expect(described_class.public_send(method, *param)).to be_falsey
       end
 
       it 'returns true when anything else specified' do
         stub_env(env_key, 'true')
-        expect(described_class.public_send(method)).to be_truthy
+        expect(described_class.public_send(method, *param)).to be_truthy
 
         stub_env(env_key, '1')
-        expect(described_class.public_send(method)).to be_truthy
+        expect(described_class.public_send(method, *param)).to be_truthy
 
         stub_env(env_key, 'anything')
-        expect(described_class.public_send(method)).to be_truthy
+        expect(described_class.public_send(method, *param)).to be_truthy
       end
     end
 
     context 'when there is no env variable set' do
       it "returns the default, #{default}" do
         stub_env(env_key, nil)
-        expect(described_class.public_send(method)).to be(default)
+        expect(described_class.public_send(method, *param)).to be(default)
       end
     end
   end
 
   describe '.signup_disabled?' do
-    it_behaves_like 'boolean method', :signup_disabled?, 'SIGNUP_DISABLED', false
+    it_behaves_like 'boolean method',
+      method: :signup_disabled?,
+      env_key: 'SIGNUP_DISABLED',
+      default: false
   end
 
   describe '.debug?' do
-    it_behaves_like 'boolean method', :debug?, 'QA_DEBUG', false
+    it_behaves_like 'boolean method',
+      method: :debug?,
+      env_key: 'QA_DEBUG',
+      default: false
   end
 
   describe '.chrome_headless?' do
-    it_behaves_like 'boolean method', :chrome_headless?, 'CHROME_HEADLESS', true
+    it_behaves_like 'boolean method',
+      method: :chrome_headless?,
+      env_key: 'CHROME_HEADLESS',
+      default: true
   end
 
   describe '.running_in_ci?' do
@@ -182,4 +195,16 @@ describe QA::Runtime::Env do
       expect(described_class.log_destination).to eq('path/to_file')
     end
   end
+
+  describe '.can_test?' do
+    it_behaves_like 'boolean method with parameter',
+      method: :can_test?,
+      param: :git_protocol_v2,
+      env_key: 'QA_CAN_TEST_GIT_PROTOCOL_V2',
+      default: true
+
+    it 'raises ArgumentError if feature is unknown' do
+      expect { described_class.can_test? :foo }.to raise_error(ArgumentError, 'Unknown feature "foo"')
+    end
+  end
 end

qa/spec/specs/runner_spec.rb

@@ -76,6 +76,20 @@ describe QA::Specs::Runner do
       end
     end
 
+    context 'when git protocol v2 is not supported' do
+      before do
+        allow(QA::Runtime::Env).to receive(:can_test?).with(:git_protocol_v2).and_return(false)
+      end
+
+      subject { described_class.new }
+
+      it 'it includes default args and excludes the requires_git_protocol_v2 tag' do
+        expect_rspec_runner_arguments(['--tag', '~orchestrated', '--tag', '~requires_git_protocol_v2', *described_class::DEFAULT_TEST_PATH_ARGS])
+
+        subject.perform
+      end
+    end
+
     def expect_rspec_runner_arguments(arguments)
       expect(RSpec::Core::Runner).to receive(:run)
         .with(arguments, $stderr, $stdout)