Implements gitops flow

Signed-off-by: Philipp Markiewka <philipp.markiewka@cloudogu.com>

Jenkinsfile

@@ -3,22 +3,10 @@
 // "Constants"
 String getCesBuildLibVersion() { '1.44.3' }
 String getCesBuildLibRepo() { 'https://github.com/cloudogu/ces-build-lib/' }
-String getAppDockerRegistry() { 'eu.gcr.io/cloudogu-backend' }
-String getCloudoguDockerRegistry() { 'ecosystem.cloudogu.com' }
-String getRegistryCredentials() { 'jenkins' }
-String getScmManagerCredentials() { 'jenkins' }
-String getKubectlImage() { 'lachlanevenson/k8s-kubectl:v1.18.2' }
-String getJdkImage() { 'bellsoft/liberica-openjdk-alpine' }
-String getHelmImage() { "${cloudoguDockerRegistry}/build-images/helm-kubeval:gcl308.0.0-alpine-helmv3.3.1" }
-String getKubevalImage() { 'garethr/kubeval:0.15.0' }
-String getGitVersion() { '2.24.3' }
-String getConfigRepositoryUrl() { "https://ecosystem.cloudogu.com/scm/repo/backend/k8s-gitops" }
-String getConfigRepositoryPRUrl() { 'ecosystem.cloudogu.com/scm/api/v2/pull-requests/backend/k8s-gitops' }
-String getDockerRegistryBaseUrl() { "https://console.cloud.google.com/gcr/images/cloudogu-backend/eu/${application}.cloudogu.com" }
-String getHelmReleaseChartSourceUrl() { "ssh://k8s-git-ops@ecosystem.cloudogu.com:2222/repo/backend/myCloudogu-helm-chart" }
-// Redundant definition of helm repo, because Flux connects via SSH and Jenkins via HTTPS. Best would be to use SSH on Jenkins -> No redundancy
-String getHelmChartRepoSourceUrl() { "https://ecosystem.cloudogu.com/scm/repo/backend/myCloudogu-helm-chart" }
-String getHelmChartTag() { "1.0.4" }
+String getScmManagerCredentials() { 'scmm-user' }
+String getConfigRepositoryUrl() { "http://scmm-scm-manager:9091/scm/repo/cluster/gitops" }
+String getConfigRepositoryPRUrl() { 'http://scmm-scm-manager:9091/scm/api/v2/pull-requests/cluster/gitops' }
+String getDockerRegistryBaseUrl() { "localhost:9092" }
 
 properties([
         // Don't run concurrent builds, because the ITs use the same port causing random failures on concurrent builds.
@@ -34,19 +22,23 @@ node {
 
     mvn = cesBuilbLib.MavenWrapper.new(this)
 
+    application = "spring-petclinic-plain"
+
     catchError {
 
         stage('Checkout') {
             checkout scm
+            git.clean('')
         }
 
+
         stage('Build') {
             mvn 'clean package -DskipTests'
 
             archiveArtifacts artifacts: '**/target/*.jar'
         }
 
-        String jacoco = "org.jacoco:jacoco-maven-plugin:0.8.1"
+        String jacoco = "org.jacoco:jacoco-maven-plugin:0.8.5"
 
         stage('Test') {
             mvn "${jacoco}:prepare-agent test ${jacoco}:report"
@@ -60,24 +52,42 @@ node {
 
         stage('Static Code Analysis') {
 
-
         }
 
+        String imageName = ""
         stage('Docker') {
+            String imageTag = createImageTag()
+            imageName = "${dockerRegistryBaseUrl}/${application}:${imageTag}"
+            mvn "spring-boot:build-image -DskipTests -Dspring-boot.build-image.imageName=${imageName}"
+
             if (isBuildSuccessful()) {
                 def docker = cesBuilbLib.Docker.new(this)
-
-                String imageTag = createImageTag()
-                imageName = "docker-registry:9092/petclinic-plain:${imageTag}"
-                def dockerImage = docker.build(imageName)
-                dockerImage.push()
+                // The docker daemon cant use the k8s service name, because it is not running inside the cluster
+                docker.withRegistry("http://${dockerRegistryBaseUrl}") {
+                    def image = docker.image(imageName)
+                    image.push()
+                }
             } else {
-                echo 'Skipping docker push, because build not successful or neither on develop branch nor "forceDeployStaging" param set'
+                echo 'Skipping docker push, because build not successful'
             }
         }
 
         stage('Deploy') {
+            if (isBuildSuccessful()) {
 
+                def gitopsConfig = [
+                        scmmCredentialsId: scmManagerCredentials,
+                        scmmConfigRepoUrl: configRepositoryUrl,
+                        scmmPullRequestUrl: configRepositoryPRUrl,
+                        updateImages: [
+                                [ deploymentFilename: "deployment.yaml",
+                                  containerName: "spring-petclinic-plain",
+                                  imageName: imageName ]
+                        ]
+                ]
+
+                pushToConfigRepo(gitopsConfig)
+            }
         }
     }
 
@@ -85,6 +95,98 @@ node {
     junit allowEmptyResults: true, testResults: '**/target/failsafe-reports/TEST-*.xml,**/target/surefire-reports/TEST-*.xml'
 }
 
+String pushToConfigRepo(Map gitopsConfig) {
+
+    def git = cesBuilbLib.Git.new(this, scmManagerCredentials)
+    def applicationRepo = GitRepo.create(git)
+    def changesOnGitOpsRepo = ''
+
+    git.committerName = 'Jenkins'
+    git.committerEmail = 'jenkins@cloudogu.com'
+
+    def configRepoTempDir = '.configRepoTempDir'
+
+
+    try {
+
+        dir(configRepoTempDir) {
+
+            git url: gitopsConfig.scmmConfigRepoUrl, branch: 'master', changelog: false, poll: false
+            git.fetch()
+
+            def repoChanges = new HashSet<String>()
+            repoChanges += createApplicationForStageAndPushToBranch 'staging', 'master', applicationRepo, git, gitopsConfig
+
+            git.checkoutOrCreate(application)
+            repoChanges += createApplicationForStageAndPushToBranch 'production', application, applicationRepo, git, gitopsConfig
+
+            changesOnGitOpsRepo = aggregateChangesOnGitOpsRepo(repoChanges)
+
+            if (changesOnGitOpsRepo) {
+                createPullRequest(gitopsConfig)
+            }
+        }
+    } finally {
+        sh "rm -rf ${configRepoTempDir}"
+    }
+
+
+    if (changesOnGitOpsRepo) {
+        // with GitOps we can only add a deployment marker for staging yet
+//        addDeploymentAnnotationToGrafana("staging")
+    }
+
+    return changesOnGitOpsRepo
+}
+
+private String aggregateChangesOnGitOpsRepo(changes) {
+    // Remove empty
+    (changes - '')
+    // and concat into string
+            .join('; ')
+}
+
+String createApplicationForStageAndPushToBranch(String stage, String branch, GitRepo applicationRepo, def git, Map gitopsConfig) {
+
+    String commitPrefix = stage == 'staging' ? '[S] ' : ''
+
+    sh "mkdir -p ${stage}/${application}"
+    // copy extra resources like sealed secrets
+    echo "Copying k8s payload from application repo to gitOps Repo: 'k8s/${stage}/*' to '${stage}/${application}'"
+    sh "cp ${env.WORKSPACE}/k8s/${stage}/* ${stage}/${application}/ || true"
+
+    gitopsConfig.updateImages.each {
+        updateImageVersion("${stage}/${application}/${it['deploymentFilename']}", it['containerName'], it['imageName'])
+    }
+
+    git.add('.')
+    if (git.areChangesStagedForCommit()) {
+        git.commit(commitPrefix + createApplicationCommitMessage(git, applicationRepo), applicationRepo.authorName, applicationRepo.authorEmail)
+
+        // If some else pushes between the pull above and this push, the build will fail.
+        // So we pull if push fails and try again
+        git.pushAndPullOnFailure("origin ${branch}")
+        return "${stage} (${git.commitHashShort})"
+    } else {
+        echo "No changes on gitOps repo for ${stage} (branch: ${branch}). Not committing or pushing."
+        return ''
+    }
+}
+
+/**
+ * Reflect build parameters in commit message used for GitOps.
+ * This is meant to bring more transparency into GitOps repo.
+ */
+String createApplicationCommitMessage(def git, def applicationRepo) {
+    String issueIds =  (applicationRepo.commitMessage =~ /#\d*/).collect { "${it} " }.join('')
+
+    String[] urlSplit = applicationRepo.repositoryUrl.split('/')
+    def repoNamespace = urlSplit[-2]
+    def repoName = urlSplit[-1]
+    String message = "${issueIds}${repoNamespace}/${repoName}@${applicationRepo.commitHash}"
+
+    return message
+}
 
 /**
  * Reflect build parameters version name.
@@ -101,3 +203,61 @@ String createImageTag() {
 
     return "${new Date().format('yyyyMMddHHmm')}-${git.commitHashShort}${branchSuffix}"
 }
+
+void updateImageVersion(String deploymentFilePath, String containerName, String newImageTag) {
+    def data = readYaml file: deploymentFilePath
+    def containers = data.spec.template.spec.containers
+    def updateContainer = containers.find {it.name == containerName}
+    updateContainer.image = newImageTag
+    writeYaml file: deploymentFilePath, data: data, overwrite: true
+}
+
+void createPullRequest(Map gitopsConfig) {
+
+    withCredentials([usernamePassword(credentialsId: gitopsConfig.scmmCredentialsId, passwordVariable: 'GIT_PASSWORD', usernameVariable: 'GIT_USER')]) {
+
+        String script =
+                'curl -s -o /dev/null -w "%{http_code}" ' +
+                        "-u ${GIT_USER}:${GIT_PASSWORD} " +
+                        '-H "Content-Type: application/vnd.scmm-pullRequest+json;v=2" ' +
+                        '--data \'{"title": "created by service ' + application + '", "source": "' + application + '", "target": "master"}\' ' +
+                        gitopsConfig.scmmPullRequestUrl
+
+        // For debugging the quotation of the shell script, just do: echo script
+        String http_code = sh returnStdout: true, script: script
+
+        // At this point we could write a mail to the last committer that his commit triggered a new or updated GitOps PR
+
+        echo "http_code: ${http_code}"
+        // PR exists if we get 409
+        if (http_code != "201" && http_code != "409") {
+            unstable 'Could not create pull request'
+        }
+    }
+}
+
+String application
+def cesBuilbLib
+
+class GitRepo {
+
+    static GitRepo create(git) {
+        // Constructors can't be used in Jenkins pipelines due to CPS
+        // https://www.jenkins.io/doc/book/pipeline/cps-method-mismatches/#constructors
+        return new GitRepo(git.commitAuthorName, git.commitAuthorEmail ,git.commitHashShort, git.commitMessage, git.repositoryUrl)
+    }
+
+    GitRepo(String authorName, String authorEmail, String commitHash, String commitMessage, String repositoryUrl) {
+        this.authorName = authorName
+        this.authorEmail = authorEmail
+        this.commitHash = commitHash
+        this.commitMessage = commitMessage
+        this.repositoryUrl = repositoryUrl
+    }
+
+    final String authorName
+    final String authorEmail
+    final String commitHash
+    final String commitMessage
+    final String repositoryUrl
+}

k8s/production/deployment.yaml

@@ -0,0 +1,23 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: spring-petclinic-plain
+  namespace: production
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: spring-petclinic-plain
+    spec:
+      containers:
+        - name: spring-petclinic-plain
+          image: localhost:9092/petclinic-plain:1
+          ports:
+            - containerPort: 8080
+          env:
+            - name: SOME_ENV
+              value: "Some Value 12345"
+  selector:
+    matchLabels:
+      app: spring-petclinic-plain

k8s/production/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  namespace: production
+  name: spring-petclinic-plain
+  labels:
+    app: spring-petclinic-plain
+spec:
+  type: LoadBalancer
+  ports:
+    - port: 9094
+      targetPort: 8080
+      protocol: TCP
+      name: http
+  selector:
+    app: spring-petclinic-plain

k8s/staging/deployment.yaml

@@ -0,0 +1,23 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: spring-petclinic-plain
+  namespace: staging
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: spring-petclinic-plain
+    spec:
+      containers:
+        - name: spring-petclinic-plain
+          image: localhost:9092/petclinic-plain:1
+          ports:
+            - containerPort: 8080
+          env:
+            - name: SOME_ENV
+              value: "Some Value 12345"
+  selector:
+    matchLabels:
+      app: spring-petclinic-plain

k8s/staging/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  namespace: staging
+  name: spring-petclinic-plain
+  labels:
+    app: spring-petclinic-plain
+spec:
+  type: LoadBalancer
+  ports:
+    - port: 9093
+      targetPort: 8080
+      protocol: TCP
+      name: http
+  selector:
+    app: spring-petclinic-plain

pom.xml

@@ -241,6 +241,7 @@
           </execution>
         </executions>
         <configuration>
+          <skip>true</skip>
           <verbose>true</verbose>
           <dateFormat>yyyy-MM-dd'T'HH:mm:ssZ</dateFormat>
           <generateGitPropertiesFile>true</generateGitPropertiesFile>