Jenkinsfile: add cgroup2

Thanks to Stefan Scherer for setting up the Jenkins nodes.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Jenkinsfile

@@ -12,6 +12,7 @@ pipeline {
         booleanParam(name: 'validate_force', defaultValue: false, description: 'force validation steps to be run, even if no changes were detected')
         booleanParam(name: 'amd64', defaultValue: true, description: 'amd64 (x86_64) Build/Test')
         booleanParam(name: 'rootless', defaultValue: true, description: 'amd64 (x86_64) Build/Test (Rootless mode)')
+        booleanParam(name: 'cgroup2', defaultValue: true, description: 'amd64 (x86_64) Build/Test (cgroup v2)')
         booleanParam(name: 'arm64', defaultValue: true, description: 'ARM (arm64) Build/Test')
         booleanParam(name: 's390x', defaultValue: true, description: 'IBM Z (s390x) Build/Test')
         booleanParam(name: 'ppc64le', defaultValue: true, description: 'PowerPC (ppc64le) Build/Test')
@@ -460,6 +461,89 @@ pipeline {
                     }
                 }
 
+                stage('cgroup2') {
+                    when {
+                        beforeAgent true
+                        expression { params.cgroup2 }
+                    }
+                    agent { label 'amd64 && ubuntu-2004 && cgroup2' }
+                    stages {
+                        stage("Print info") {
+                            steps {
+                                sh 'docker version'
+                                sh 'docker info'
+                            }
+                        }
+                        stage("Build dev image") {
+                            steps {
+                                sh '''
+                                docker build --force-rm --build-arg APT_MIRROR --build-arg SYSTEMD=true -t docker:${GIT_COMMIT} .
+                                '''
+                            }
+                        }
+                        stage("Integration tests") {
+                            environment {
+                                DOCKER_SYSTEMD = '1' // recommended cgroup driver for v2
+                                TEST_SKIP_INTEGRATION_CLI = '1' // CLI tests do not support v2
+                            }
+                            steps {
+                                sh '''
+                                docker run --rm -t --privileged \
+                                  -v "$WORKSPACE/bundles:/go/src/github.com/docker/docker/bundles" \
+                                  --name docker-pr$BUILD_NUMBER \
+                                  -e DOCKER_GITCOMMIT=${GIT_COMMIT} \
+                                  -e DOCKER_GRAPHDRIVER \
+                                  -e DOCKER_EXPERIMENTAL \
+                                  -e DOCKER_SYSTEMD \
+                                  -e TEST_SKIP_INTEGRATION_CLI \
+                                  -e TIMEOUT \
+                                  -e VALIDATE_REPO=${GIT_URL} \
+                                  -e VALIDATE_BRANCH=${CHANGE_TARGET} \
+                                  docker:${GIT_COMMIT} \
+                                  hack/make.sh \
+                                    dynbinary \
+                                    test-integration
+                                '''
+                            }
+                            post {
+                                always {
+                                    junit testResults: 'bundles/**/*-report.xml', allowEmptyResults: true
+                                }
+                            }
+                        }
+                    }
+
+                    post {
+                        always {
+                            sh '''
+                            echo "Ensuring container killed."
+                            docker rm -vf docker-pr$BUILD_NUMBER || true
+                            '''
+
+                            sh '''
+                            echo "Chowning /workspace to jenkins user"
+                            docker run --rm -v "$WORKSPACE:/workspace" busybox chown -R "$(id -u):$(id -g)" /workspace
+                            '''
+
+                            catchError(buildResult: 'SUCCESS', stageResult: 'FAILURE', message: 'Failed to create bundles.tar.gz') {
+                                sh '''
+                                bundleName=amd64-cgroup2
+                                echo "Creating ${bundleName}-bundles.tar.gz"
+                                # exclude overlay2 directories
+                                find bundles -path '*/root/*overlay2' -prune -o -type f \\( -name '*-report.json' -o -name '*.log' -o -name '*.prof' -o -name '*-report.xml' \\) -print | xargs tar -czf ${bundleName}-bundles.tar.gz
+                                '''
+
+                                archiveArtifacts artifacts: '*-bundles.tar.gz', allowEmptyArchive: true
+                            }
+                        }
+                        cleanup {
+                            sh 'make clean'
+                            deleteDir()
+                        }
+                    }
+                }
+
+
                 stage('s390x') {
                     when {
                         beforeAgent true