deployments/sharedLibs/imageBuilder.groovy

generateFullImageUri = {Map DOCKER, String base_branch, String BUILD_NUMBER ->
    return "${DOCKER.registry}/${DOCKER.image}:${base_branch}-${BUILD_NUMBER}"
}

generateImageName = {Map DOCKER, String base_branch, String BUILD_NUMBER ->
    return "${DOCKER.image}:${base_branch}-${BUILD_NUMBER}"
}

def generateDockerfile(String JAR, String module, String pathOfDockerfile='projdir') {
    
    module = module == null ? '' : (module[-1] == '/' ? module : module + '/')
    sh """cat > ${pathOfDockerfile}/Dockerfile<<EOF
FROM openjdk:8-alpine as final
ADD ${module}target/${JAR} /app/target/${JAR}
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-Xmx1024m","-Dserver.port=80","-jar","/app/target/${JAR}", "--spring.config.location=file:/app/configs/application.yml"]
EOF
"""
    return pathOfDockerfile
}

generateNodeJsDockerFile = { ... args ->
    return 'projdir'
}

def buildJar(String path='projdir') {
    
    echo "-----> Building java package ..."
    dir(path){
        sh '$MAVEN_HOME/bin/mvn clean package -Dmaven.test.skip=true'
    }
    return path
}

def cleanJar(String path='projdir') {
    echo "-----> Clean java package ..."
    dir(path){
        sh '$MAVEN_HOME/bin/mvn clean'
    }
    return path
}

def buildDockerImage(Object SERVICE, Object DOCKER, String base_branch, Closure dockerfile=null, String filter2Remove=null) {

    def imageUri = generateFullImageUri(DOCKER, base_branch, BUILD_NUMBER)
    echo "-----> Building docker image: ${imageUri} ..."
    def projDir = 'projdir'
    if (dockerfile != null)
        projDir = dockerfile(SERVICE.jar, SERVICE.module)
    else
        projDir = generateDockerfile(SERVICE.jar, SERVICE.module)

    dir(projDir) {
        docker.withRegistry("http://${DOCKER.registry}", "${DOCKER.push_credentialId}") {
            def imageName = generateImageName(DOCKER, base_branch, BUILD_NUMBER)
            def image = docker.build(imageName)
            image.push()
            sh "docker rmi ${imageName}"
            sh "docker rmi ${imageUri}"
            if(filter2Remove != null)
                sh "docker image prune --filter label=${filter2Remove} -f"
        }
    }
    return imageUri
}

return this