Convert to Jenkins Pipeline

Jenkinsfile

@@ -0,0 +1,87 @@
+/*
+Required plugins in Jenkins:
+- Pipeline Utility Steps
+- Docker Pipeline
+*/
+
+def app_version
+def app_build
+def url_download
+def app_filename
+def docker_tag
+def docker_tag_latest
+
+pipeline {
+    agent any
+
+    parameters {
+        string(name: 'MC_VERSION', description: 'The Minecraft version to build.')
+    }
+
+    environment {
+        URL_BASE = 'https://api.papermc.io/v2/projects/paper'
+        URL_VERSION_INFOS = "${URL_BASE}/versions/${params.MC_VERSION}"
+
+        DOCKER_TAG_BASE = 'cr.pandacube.fr/paper'
+        DOCKER_REGISTRY_URL = 'https://cr.pandacube.fr'
+        DOCKER_REGISTRY_CREDENTIALS = 'cr-pandacube-credentials'
+    }
+
+    stages {
+
+        stage('Get build data') {
+            steps {
+                sh "curl -L -s '$URL_VERSION_INFOS' -o version_infos.json"
+                script {
+                    def version_infos = readJSON file: 'version_infos.json'
+                    
+                    app_version = params.MC_VERSION
+                    app_build = version_infos.builds[-1]
+                    url_download = "${URL_VERSION_INFOS}/builds/${app_build}/downloads/paper-${app_version}-${app_build}.jar"
+                    app_filename = "Paper-${MC_VERSION}-${app_build}.jar"
+
+                    docker_tag = "${DOCKER_TAG_BASE}:${app_version}-${app_build}"
+                    docker_tag_version = "${DOCKER_TAG_BASE}:${app_version}"
+                }
+                echo "Paper version ${app_version} build #${app_build}"
+            }
+        }
+
+        stage('Download jar') {
+            steps {
+                sh "curl -L -o '$app_filename' '$url_download'"
+            }
+            post {
+                success {
+                    archiveArtifacts artifacts: 'Paper-*.jar', fingerprint: true
+                }
+            }
+        }
+
+        stage('Build Docker image') {
+            steps {
+                script {
+                    docker.build(docker_tag, "--build-arg RUNNABLE_SERVER_JAR=$app_filename .")
+                }
+                sh "docker tag ${docker_tag} ${docker_tag_version}"
+            }
+        }
+
+        stage('Push Docker image') {
+            steps {
+                script {
+                    docker.withRegistry(DOCKER_REGISTRY_URL, DOCKER_REGISTRY_CREDENTIALS) {
+                        docker.image(docker_tag).push()
+                        docker.image(docker_tag_version).push()
+                    }
+                }
+            }
+        }
+    }
+
+    post {
+        cleanup {
+            cleanWs()
+        }
+    }
+}

Readme.md

@@ -1,4 +1,22 @@
-Docker Compose Example
+# PaperDockerBuilder
+
+Jenkins pipeline to build a Docker image of Paper.
+
+```bash
+Dockerfile  # used to build the Docker image
+Jenkinsfile # the pipeline file
+Readme.md   # you are reading this file
+run.sh      # entrypoint of the Docker image
+```
+
+## Pipeline process
+
+1. Fetches the information about the latest build of Paper for the provided MC version, from the [PaperMC API](https://api.papermc.io/v2/projects/paper)
+2. Downloads the Paper jar file.
+3. Builds the docker image with the downloaded jar and the entrypoint script, ensuring libraries are downloaded and Paper patch is applied.
+4. Pushes the image to the container registry with the tags `$mc_version` (e.g. `1.20.1`) and `$mc_version-$paper_build` (e.g. `1.20.1-196`)
+
+## Docker Compose Example
 
 ```yml
 version: "3"

build.sh

@@ -1,47 +0,0 @@
-#!/bin/bash
-
-URL_PROJECT='https://api.papermc.io/v2/projects/paper'
-
-echo "Getting Paper last build id for MC "$MC_VERSION"..."
-
-URL_VERSION=$URL_PROJECT'/versions/'$MC_VERSION
-
-# get paper build version
-if ! curl -s $URL_VERSION -o version_infos.json; then
-	echo -e "Error: Can't join API"
-    exit 1
-fi
-
-
-if ! jq -r '.builds[-1]' -e < version_infos.json > build_number.txt; then
-	echo -e "API returned an error (probably MC_VERSION is not valid)"
-    exit 1
-fi
-
-PAPER_BUILD=`cat build_number.txt`
-URL_BUILD=$URL_VERSION'/builds/'$PAPER_BUILD
-
-
-DOWNLOAD_REOBF=$URL_BUILD'/downloads/paper-'$MC_VERSION'-'$PAPER_BUILD'.jar'
-
-# the runnable jar is actually paperclip
-RUNNABLE_SERVER_JAR='Paper-'$MC_VERSION'-'$PAPER_BUILD'.jar'
-#UBER_SERVER_JAR='Paper-uberjar-'$MC_VERSION'-'$PAPER_BUILD'.jar'
-
-echo "Downloadling Paperclip for Paper-"$MC_VERSION"-"$PAPER_BUILD"..."
-echo "From "$DOWNLOAD_REOBF
-echo "To "$RUNNABLE_SERVER_JAR
-curl -o $RUNNABLE_SERVER_JAR $DOWNLOAD_REOBF
-
-
-DOCKER_TAG="cr.pandacube.fr/paper:"$MC_VERSION"-"$PAPER_BUILD
-DOCKER_TAG_VERSION="cr.pandacube.fr/paper:"$MC_VERSION
-echo "Building docker image with pre-downloaded and pre-patched files, with tag "$DOCKER_TAG
-docker build --build-arg RUNNABLE_SERVER_JAR=$RUNNABLE_SERVER_JAR -t $DOCKER_TAG .
-docker tag $DOCKER_TAG $DOCKER_TAG_VERSION
-
-
-echo "Pushing image to Pandacube's container registry"
-docker push $DOCKER_TAG
-docker push $DOCKER_TAG_VERSION
-