Résumé

Liste des changements à apporter à l’environnement de build pour passer de Gradle 4.5 à Maven 3.8.

Ticket JIRA et commit

Avant de toucher à un module, il faut créer un ticket JIRA avec comme titre :

[Nom de l’app] - Migration Maven

Après chaque portage, le message de commit doit être le suivant :

"feat: #<NUM_TICKET>, migration Maven"

Portage

pom.xml

Reprendre le squelette ci-desous

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <groupId>fr.wseduc</groupId>   <!-- Vient de gradle.properties > modowner -->
  <artifactId>mod-zip</artifactId><!-- Vient de gradle.properties > modname -->
  <version>3.0-b2school-SNAPSHOT</version><!-- Vient de gradle.properties > version -->
  <properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
    <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
    <vertx.version>4.4.5</vertx.version>
    <web-utils.version>2.0.0</web-utils.version>
    <jacksonDatabindVersion>2.15.2</jacksonDatabindVersion>
  </properties>
  <scm><!-- À ajuster en fonction de l'url GitHub/GitLab -->
    <connection>scm:git:https://github.com/opendigitaleducation/mod-zip.git</connection>
    <developerConnection>scm:git:https://github.com/opendigitaleducation/mod-zip.git</developerConnection>
    <url>https://github.com/opendigitaleducation/mod-zip</url>
  </scm>
  <repositories>
    <repository>
      <id>ode</id>
      <name>ODE Repository</name>
      <url>https://maven.opendigitaleducation.com/nexus/content/groups/public</url>
    </repository>
  </repositories>
  <distributionManagement>
    <snapshotRepository>
      <id>ode-snapshots</id>
      <name>Snapshots</name>
      <url>https://maven.opendigitaleducation.com/nexus/content/repositories/snapshots/</url>
    </snapshotRepository>
    <repository>
      <id>ode-releases</id>
      <name>Releases</name>
      <url>https://maven.opendigitaleducation.com/nexus/content/repositories/releases/</url>
    </repository>
  </distributionManagement>

  <dependencies>
    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-core</artifactId>
      <version>${vertx.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>fr.wseduc</groupId>
      <artifactId>web-utils</artifactId>
      <version>${web-utils.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jacksonDatabindVersion}</version>
      <scope>provided</scope>
    </dependency>
    <!-- Ajouter les autres dépendances qui étaient dans build.gradle > dependencies -->
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>buildnumber-maven-plugin</artifactId>
        <version>3.2.0</version>
        <executions>
          <execution>
            <phase>validate</phase>
            <goals><goal>create</goal></goals>
          </execution>
        </executions>
        <configuration>
          <getRevisionOnlyOnce>true</getRevisionOnlyOnce>
          <shortRevisionLength>8</shortRevisionLength>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>3.5.1</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <finalName>${project.groupId}~${project.artifactId}~${project.version}-fat</finalName>
              <!--transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <mainClass>your.main.class.name</mainClass>
                </transformer>
              </transformers-->
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.2.2</version> <!-- Use the latest version -->
        <configuration>
          <archive>
            <manifestEntries>
              <Build-Time>${maven.build.timestamp}</Build-Time>
              <Main-Verticle>service:mod</Main-Verticle>
              <SCM-Commit-Id>${buildNumber}</SCM-Commit-Id>
              <SCM-Branch>${scmBranch}</SCM-Branch>

            </manifestEntries>
          </archive>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>2.6</version>
        <executions>
          <execution>
            <id>copy-resources</id>
            <phase>validate</phase>
            <goals>
              <goal>copy-resources</goal>
            </goals>
            <configuration>
              <outputDirectory>${basedir}/target/classes</outputDirectory>
              <includeEmptyDirs>true</includeEmptyDirs>
              <resources>
                <resource>
                  <directory>${basedir}/deployment</directory>
                  <filtering>false</filtering>
                </resource>
              </resources>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven-compiler-plugin.version}</version>
        <configuration>
          <source>${java.version}</source>
          <target>${java.version}</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>${maven-surefire-plugin.version}</version>
      </plugin>
    </plugins>
  </build>
</project>

docker-compose.yml

Remplacer le service gradle par le service maven tel que décrit plus bas.

version: "3"
services:
  maven:
    image: maven:3.8.6-jdk-8
    user: "$DEFAULT_DOCKER_USER"
    working_dir: /usr/src/maven
    volumes:
      - ./:/usr/src/maven
      - ~/.m2:/var/maven/.m2
    environment:
      MAVEN_CONFIG: /var/maven/.m2

build.sh

Ajouter au début du fichier la variable MVN_OPTS tel que décrit ci-dessous.

MVN_OPTS="-Duser.home=/var/maven"

Remplacer les appels au service gradle par des appels au service maven tel que ci-dessous.

Avant:

docker-compose run --rm -u "$USER_UID:$GROUP_GID" gradle gradle clean

Après :

docker-compose run --rm maven mvn $MVN_OPTS clean

Ajouter les méthodes init , install et test et les ajouter à la liste des options supportées (la méthode install remplace buildGradle)

init() {
  me=`id -u`:`id -g`
  echo "DEFAULT_DOCKER_USER=$me" > .env
}

...

install () {
  docker-compose run --rm maven mvn $MVN_OPTS install -DskipTests
}

test () {
  docker-compose run --rm maven mvn $MVN_OPTS test
}
...

for param in "$@"
do
  case $param in
    init)
      init
      ;;
      
      ...
      
    install)
      install
      ;; 
    test)
      test
      ;;
      
...

Modifier la méthode publish pour qu’elle soit équivalente à celle écrite ci-dessous :

publish() {
  version=`docker-compose run --rm maven mvn $MVN_OPTS help:evaluate -Dexpression=project.version -q -DforceStdout`
  level=`echo $version | cut -d'-' -f3`
  case "$level" in
    *SNAPSHOT) export nexusRepository='snapshots' ;;
    *)         export nexusRepository='releases' ;;
  esac

  docker-compose run --rm  maven mvn -DrepositoryId=ode-$nexusRepository -DskiptTests -Dmaven.test.skip=true --settings /var/maven/.m2/settings.xml deploy
}

Exemple complet :

#!/bin/bash

MVN_OPTS="-Duser.home=/var/maven"

init() {
  me=`id -u`:`id -g`
  echo "DEFAULT_DOCKER_USER=$me" > .env
}

clean () {
  docker-compose run --rm maven mvn $MVN_OPTS clean
}

install () {
  docker-compose run --rm maven mvn $MVN_OPTS install -DskipTests
}

test () {
  docker-compose run --rm maven mvn $MVN_OPTS test
}

publish() {
  version=`docker-compose run --rm maven mvn $MVN_OPTS help:evaluate -Dexpression=project.version -q -DforceStdout`
  level=`echo $version | cut -d'-' -f3`
  case "$level" in
    *SNAPSHOT) export nexusRepository='snapshots' ;;
    *)         export nexusRepository='releases' ;;
  esac
  docker-compose run --rm  maven mvn -DrepositoryId=ode-$nexusRepository -DskiptTests -Dmaven.test.skip=true --settings /var/maven/.m2/settings.xml deploy
}

for param in "$@"
do
  case $param in
    init)
      init
      ;;
    clean)
      clean
      ;;
    install)
      install
      ;;
    test)
      test
      ;;
    publish)
      publish
      ;;
    *)
      echo "Invalid argument : $param"
  esac
  if [ ! $? -eq 0 ]; then
    exit 1
  fi
done

Jenkinsfile

Ajouter l'étape “Initialization”.
Au tout premier argument du build.sh, ajouter le paramètre init afin d’initialiser le fichier .env

Avant :

#!/usr/bin/env groovy

pipeline {
  agent any
    stages {
      stage("Initialization") {
        steps {
          script {
            def version = sh(returnStdout: true, script: 'docker-compose run --rm maven mvn $MVN_OPTS help:evaluate -Dexpression=project.version -q -DforceStdout')
            buildName "${env.GIT_BRANCH.replace("origin/", "")}@${version}"
          }
        }
      }
      stage('Build') {
        steps {
          checkout scm
          sh './build.sh clean install publish'
        }
      }
    }
}