From cd94a6112ca0779b9323d8f041c7f6527c9fe679 Mon Sep 17 00:00:00 2001
From: Marc Baloup <marc.baloup@laposte.net>
Date: Tue, 16 Jan 2024 16:51:00 +0100
Subject: [PATCH] Jenkins pipeline

---
 Jenkinsfile | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 Readme.md   | 25 +++++++++++++++---
 2 files changed, 95 insertions(+), 3 deletions(-)
 create mode 100644 Jenkinsfile

diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..36260dd
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,73 @@
+/*
+Required plugins in Jenkins:
+- Pipeline Utility Steps
+- Docker Pipeline
+*/
+
+def geyser_version
+def geyser_build
+def runnable_jar
+def docker_tag
+def docker_tag_latest
+
+pipeline {
+    agent any
+    environment {
+        URL_BUILD = 'https://download.geysermc.org/v2/projects/geyser/versions/latest/builds/latest'
+        URL_DOWNLOAD = URL_BUILD + '/downloads/standalone'
+        DOCKER_TAG_BASE = 'cr.pandacube.fr/geyser'
+        DOCKER_CR_PANDACUBE_CREDENTIALS = 'cr-pandacube-credentials'
+    }
+
+    stages {
+
+        stage('Get build data') {
+            steps {
+                sh 'curl -L -s $URL_BUILD -o build_infos.json'
+                script {
+                    def build_infos = readJSON file: 'build_infos.json'
+                    geyser_version = build_infos.version
+                    geyser_build = build_infos.build
+                    runnable_jar = "Geyser-${geyser_version}-${geyser_build}.jar"
+                    docker_tag = "${DOCKER_TAG_BASE}:${GEYSER_VERSION}-${GEYSER_BUILD}"
+                    docker_tag_latest = "${DOCKER_TAG_BASE}:latest"
+                }
+                echo "Geyser version ${geyser_version} build #${geyser_build}"
+            }
+        }
+
+        stage('Download jar') {
+            steps {
+                echo "From $URL_DOWNLOAD"
+                echo "To $runnable_jar"
+                sh "curl -L -o '$runnable_jar' '$URL_DOWNLOAD'"
+            }
+        }
+
+        stage('Build Docker image') {
+            steps {
+                script {
+                    docker.build(docker_tag, "--build-arg RUNNABLE_JAR=$runnable_jar .")
+                }
+                sh "docker tag ${docker_tag} ${docker_tag_latest}"
+            }
+        }
+
+        stage('Push Docker image') {
+            steps {
+                script {
+                    docker.withRegistry('cr.pandacube.fr', DOCKER_CR_PANDACUBE_CREDENTIALS) {
+                        docker.image(docker_tag).push()
+                        docker.image(docker_tag_latest).push()
+                    }
+                }
+            }
+        }
+    }
+
+    post { 
+        always { 
+            cleanWs()
+        }
+    }
+}
\ No newline at end of file
diff --git a/Readme.md b/Readme.md
index 6ef7791..1b1811b 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,10 +1,29 @@
-Docker Compose Example
+# GeyserDockerBuilder
+
+Jenkins pipeline to build a Docker image of Geyser Standalone.
+
+```bash
+build.sh    # the old pipeline script, not used anymore
+Dockerfile  # used to build the image
+Jenkinsfile # the new pipeline script
+Readme.md   # you are reading this file
+run.sh      # entrypoint of the docker image
+```
+
+## Pipeline process
+
+- Fetches the information about the latest build of Geyser (version, build number), from the [GeyserMC API](https://download.geysermc.org/v2/projects)
+- Downloads the Geyser Standalone jar file.
+- Builds the docker image with the downloaded jar and the entrypoint script.
+- Pushes the image to the container registry with the tags `latest` and `$geyser_version-$geyser_build` (e.g. `2.2.0-408`)
+
+## Docker Compose Example
 
 ```yml
 version: "3"
 services:
-  (server-name):
-    image: "cr.pandacube.fr/geyser:(version)"
+  geyser:
+    image: "cr.pandacube.fr/geyser:latest"
     stdin_open: true # docker run -i
     tty: true        # docker run -t
     user: "1000:1000" # uid and gid of owner of working dir