Jenkinsfile.tools.update-jenkins-dependencies

import org.jenkinsci.plugins.workflow.libs.Library

@Library('jenkins-pipeline-shared-libraries')_

// This Jenkinsfile has not been tested on Apache Jenkins yet
// and will likely fail due to restrictions on Groovy sandbox methods
// See `findPlugin` and `getJenkinsVersion` methods

branchCreated = false

pipeline {
    agent {
        docker {
            image env.AGENT_DOCKER_BUILDER_IMAGE
            args env.AGENT_DOCKER_BUILDER_ARGS
            label util.avoidFaultyNodes('ubuntu')
        }
    }

    options {
        timeout(time: 60, unit: 'MINUTES')
    }

    environment {
        KOGITO_CI_EMAIL_TO = credentials("${JENKINS_EMAIL_CREDS_ID}")
    }

    stages {
        stage('Checkout repo') {
            steps {
                script {
                    dir(getRepoName()) {
                        deleteDir()

                        // Checkout repository
                        checkout(githubscm.resolveRepository(getRepoName(), getGitAuthor(), getBuildBranch(), false, getGitAuthorCredsId()))
                        githubscm.setUserConfig(getGitAuthorCredsId())
                        branchCreated = getOrCreateGitBranch(getPRBranch(), getGitAuthorPushCredsId())
                    }
                }
            }
        }

        stage('Update DSL Gradle dependencies') {
            steps {
                script {
                    dir(getRepoName()) {
                        String lookupCmd = '''
                            cat dsl/seed/gradle.properties | grep 'version_jenkins_plugins_' | awk -F'version_jenkins_plugins_' '{print $2}' | awk -F'=' '{print $1}' | tr '\n' ','
                        '''
                        def plugins = sh(returnStdout: true, script: lookupCmd).trim().split(',')
                        echo "Got plugins ${plugins}"

                        def managedPluginsVersion = [:]
                        plugins.each {
                            String pluginShortName = it.replaceAll('_', '-')
                            String pluginVarName = "version_jenkins_plugins_${it}"
                            def plugin = findPlugin(pluginShortName)
                            if (plugin) {
                                managedPluginsVersion[pluginVarName] = plugin.getVersion()
                            } else {
                                unstable("Could not find plugin ${pluginShortName}. Please make sure it is installed")
                            }
                        }

                        echo "Got managed plugins version: ${managedPluginsVersion}"
                        managedPluginsVersion.each { pluginVarName, pluginVersion ->
                            echo "Updating plugin ${pluginVarName} with version ${pluginVersion}"
                            sh """
                                sed -i 's|${pluginVarName}=.*|${pluginVarName}=${pluginVersion}|g' dsl/seed/gradle.properties
                            """
                        }

                        String jenkinsVersion = getJenkinsVersion()
                        echo "Updating Jenkins version to version ${jenkinsVersion}"
                        sh """
                            sed -i 's|version_jenkins=.*|version_jenkins=${jenkinsVersion}|g' dsl/seed/gradle.properties
                        """
                    }
                }
            }
        }

        stage('Update Maven tests dependencies') {
            steps {
                script {
                    dir(getRepoName()) {
                        String lookupCmd = '''
                            cat .ci/jenkins/tests/pom.xml | grep '<version.jenkins.plugins.' | awk -F'>' '{print $1}' | awk -F'<version.jenkins.plugins.' '{print $2}' | tr '\n' ','
                        '''
                        def plugins = sh(returnStdout: true, script: lookupCmd).trim().split(',')
                        echo "Got plugins ${plugins}"

                        def managedPluginsVersion = [:]
                        plugins.each {
                            String pluginShortName = it
                            String pluginVarName = "version.jenkins.plugins.${it}"
                            def plugin = findPlugin(pluginShortName)
                            if (plugin) {
                                managedPluginsVersion[pluginVarName] = plugin.getVersion()
                            } else {
                                unstable("Could not find plugin ${pluginShortName}. Please make sure it is installed")
                            }
                        }

                        echo "Got managed plugins version: ${managedPluginsVersion}"
                        managedPluginsVersion.each { pluginVarName, pluginVersion ->
                            echo "Updating plugin ${pluginVarName} with version ${pluginVersion}"
                            sh """
                                sed -i 's|<${pluginVarName}>.*</${pluginVarName}>|<${pluginVarName}>${pluginVersion}</${pluginVarName}>|g' .ci/jenkins/tests/pom.xml
                            """
                        }

                        String jenkinsVersion = getJenkinsVersion()
                        echo "Updating Jenkins version to version ${jenkinsVersion}"
                        sh """
                            sed -i 's|<version.jenkins>.*</version.jenkins>|<version.jenkins>${jenkinsVersion}</version.jenkins>|g' .ci/jenkins/tests/pom.xml
                        """
                    }
                }
            }
        }

        stage('Create PR') {
            steps {
                script {
                    dir(getRepoName()) {
                        if (githubscm.isThereAnyChanges()) {
                            def commitMsg = "[${getBuildBranch()}] Update Jenkins dependencies to DSL/Jenkins files"
                            githubscm.commitChanges(commitMsg, {
                                githubscm.findAndStageNotIgnoredFiles('pom.xml')
                                githubscm.findAndStageNotIgnoredFiles('gradle.properties')
                            })
                            githubscm.pushObject('origin', getPRBranch(), getGitAuthorPushCredsId())

                            if (branchCreated) {
                                def prBody = "Generated by build ${BUILD_TAG}: ${BUILD_URL}.\nPlease review and merge."
                                prLink = githubscm.createPR(commitMsg, prBody, getBuildBranch(), getGitAuthorCredsId())

                                sendNotification("Please review PR ${prLink}")
                            } else {
                                echo "Branch ${getPRBranch()} was already created so assuming the PR exists alrerady ..."
                            }
                        } else {
                            println '[WARN] no changes to commit'
                        }
                    }
                }
            }
        }
    }
    post {
        unsuccessful {
            script {
                sendErrorNotification()
            }
        }
    }
}

def findPlugin(String pluginShortName) {
    return Jenkins.instance.pluginManager.plugins.find { it.getShortName() == pluginShortName }
}

String getJenkinsVersion() {
    return Jenkins.getVersion()
}

void sendNotification(String body) {
    emailext body: "**Jenkins dependencies update to DSL/Jenkins files**\n${body}",
             subject: "[${getBuildBranch()}] Kogito pipelines",
             to: env.KOGITO_CI_EMAIL_TO
}

void sendErrorNotification() {
    String body = """
Job #${BUILD_NUMBER} was: **${currentBuild.currentResult}**

Please look here: ${BUILD_URL}
"""
    sendNotification(body)
}

String getBuildBranch() {
    return env.BUILD_BRANCH_NAME
}

String getGitAuthor() {
    return env.GIT_AUTHOR
}

String getGitAuthorCredsId() {
    return env.GIT_AUTHOR_CREDS_ID
}

String getGitAuthorPushCredsId() {
    return env.GIT_AUTHOR_PUSH_CREDS_ID
}

String getPRBranch() {
    return "${getBuildBranch()}-${getJenkinsVersion()}"
}

String getRepoName() {
    return env.REPO_NAME
}

boolean getOrCreateGitBranch(String branch, String credentialsId) {
    sh 'git fetch origin'
    String branchRemoteResult = sh(script: "git ls-remote origin ${branch} | wc -l", returnStdout: true).trim()
    if (Integer.parseInt(branchRemoteResult) > 0) {
        echo "Branch ${branch} already exist ... will not create it. Checking out !"
        sh """
            git checkout origin/${branch} -b ${branch}
            git merge origin/${getBuildBranch()}
        """
        return false
    } else {
        echo "Branch ${branch} does not exist ... gonna create it"
        githubscm.createBranch(branch)
        githubscm.pushObject('origin', branch,  credentialsId)
        return true
    }
}