implemented groovy script to configure admin user creation using environment variables passed to the vm

Author: amr-yassir

tfgrid3/jenkins/Dockerfile

@@ -2,20 +2,19 @@ FROM ubuntu
 
 RUN apt update
 RUN apt -y install wget openssh-server
-RUN apt -y install gnupg
 
-RUN wget -O /usr/share/keyrings/jenkins-keyring.asc \
-https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key
+RUN wget -O /usr/share/keyrings/jenkins-keyring.asc https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key
+RUN echo "deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] https://pkg.jenkins.io/debian-stable binary/" | tee /etc/apt/sources.list.d/jenkins.list > /dev/null
 
-RUN echo "deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc]" \
-https://pkg.jenkins.io/debian-stable binary/ | tee \
-/etc/apt/sources.list.d/jenkins.list > /dev/null
-
-RUN apt-get update
-RUN apt -y install jenkins
+RUN apt-get update && apt-get -y install jenkins default-jre
 
 RUN wget -O /sbin/zinit https://github.com/threefoldtech/zinit/releases/download/v0.2.5/zinit && chmod +x /sbin/zinit
+
 COPY rootfs /
 
-EXPOSE 8080
+RUN mkdir -p /root/.jenkins/init.groovy.d
+COPY /set-admin-user.groovy /root/.jenkins/init.groovy.d/set-admin-user.groovy
+
+EXPOSE 9090
+
 ENTRYPOINT [ "/sbin/zinit", "init" ]

tfgrid3/jenkins/rootfs/etc/zinit/print-jenkins-password.yaml

@@ -1 +1 @@
-exec: /usr/bin/jenkins
+exec: /usr/bin/jenkins --httpPort=9090

tfgrid3/jenkins/rootfs/etc/zinit/start-jenkins.yaml

@@ -0,0 +1,17 @@
+#!groovy
+
+import jenkins.model.*
+import hudson.security.*
+
+def instance = Jenkins.getInstance()
+
+def adminUsername = System.getenv("JENKINS_ADMIN_USERNAME") ?: "admin"
+def adminPassword = System.getenv("JENKINS_ADMIN_PASSWORD") ?: "admin"
+
+def hudsonRealm = new HudsonPrivateSecurityRealm(false)
+hudsonRealm.createAccount(adminUsername, adminPassword)
+instance.setSecurityRealm(hudsonRealm)
+
+def strategy = new FullControlOnceLoggedInAuthorizationStrategy()
+instance.setAuthorizationStrategy(strategy)
+instance.save()