Initial commit for a jenkins build container.

.gitignore

+##LDE specific
+.project
+*.iml
+*.idea

Dockerfile

+FROM jenkins/inbound-agent:4.3-4-jdk11
+
+# install maven like https://github.com/carlossg/docker-maven/tree/master/openjdk-11
+ARG MAVEN_VERSION=3.6.3
+ARG USER_HOME_DIR="/root"
+ARG SHA=c35a1803a6e70a126e80b2b3ae33eed961f83ed74d18fcd16909b2d44d7dada3203f1ffe726c17ef8dcca2dcaa9fca676987befeadc9b9f759967a8cb77181c0
+ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries
+
+RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
+  && curl -fsSL -o /tmp/apache-maven.tar.gz ${BASE_URL}/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
+  && echo "${SHA}  /tmp/apache-maven.tar.gz" | sha512sum -c - \
+  && tar -xzf /tmp/apache-maven.tar.gz -C /usr/share/maven --strip-components=1 \
+  && rm -f /tmp/apache-maven.tar.gz \
+  && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
+
+ENV MAVEN_HOME /usr/share/maven
+ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"
+
+COPY mvn-entrypoint.sh /usr/local/bin/mvn-entrypoint.sh
+COPY settings-docker.xml /usr/share/maven/ref/
+
+# configure maven
+COPY settings-maven.xml ${MAVEN_CONFIG}/settings.xml
+
+ENTRYPOINT ["/usr/local/bin/mvn-entrypoint.sh"]
+
+CMD ["mvn"]
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Jenkinsfile

+pipeline {
+    agent {
+        node {
+            label 'docker'
+        }
+    }
+    options {
+        timeout(time: 1, unit: 'HOURS')
+        buildDiscarder(
+            logRotator(
+                numToKeepStr: '10',
+                artifactNumToKeepStr: '3'
+            )
+        )
+        ansiColor('xterm')
+    }
+    triggers {
+        cron('@weekly')
+    }
+    stages {
+        def customImage
+
+        stage('Clone repository') {
+            checkout scm
+        }
+        stage('Build Docker image') {
+            customImage = docker.build("demo-infra-jenkins-agent")
+        }
+        stage('Test Docker image') {
+            app.inside {
+                sh 'mvn'
+            }
+        }
+        stage('Push image') {
+            /* push image with two tags:
+             *  - the incremental build number from Jenkins;
+             *  - the 'latest' tag. */
+            docker.withRegistry('https://www.joaolino.com/nexus/repository/docker-public/', 'nexus-admin') {
+                customImage.push("${env.BUILD_NUMBER}")
+                customImage.push("latest")
+            }
+        }
+    }
+}
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mvn-entrypoint.sh

+#! /bin/sh -eu
+
+# Copy files from /usr/share/maven/ref into ${MAVEN_CONFIG}
+# So the initial ~/.m2 is set with expected content.
+# Don't override, as this is just a reference setup
+
+copy_reference_files() {
+  local log="$MAVEN_CONFIG/copy_reference_file.log"
+  local ref="/usr/share/maven/ref"
+
+  if mkdir -p "${MAVEN_CONFIG}/repository" && touch "${log}" > /dev/null 2>&1 ; then
+      cd "${ref}"
+      local reflink=""
+      if cp --help 2>&1 | grep -q reflink ; then
+          reflink="--reflink=auto"
+      fi
+      if [ -n "$(find "${MAVEN_CONFIG}/repository" -maxdepth 0 -type d -empty 2>/dev/null)" ] ; then
+          # destination is empty...
+          echo "--- Copying all files to ${MAVEN_CONFIG} at $(date)" >> "${log}"
+          cp -rv ${reflink} . "${MAVEN_CONFIG}" >> "${log}"
+      else
+          # destination is non-empty, copy file-by-file
+          echo "--- Copying individual files to ${MAVEN_CONFIG} at $(date)" >> "${log}"
+          find . -type f -exec sh -eu -c '
+              log="${1}"
+              shift
+              reflink="${1}"
+              shift
+              for f in "$@" ; do
+                  if [ ! -e "${MAVEN_CONFIG}/${f}" ] || [ -e "${f}.override" ] ; then
+                      mkdir -p "${MAVEN_CONFIG}/$(dirname "${f}")"
+                      cp -rv ${reflink} "${f}" "${MAVEN_CONFIG}/${f}" >> "${log}"
+                  fi
+              done
+          ' _ "${log}" "${reflink}" {} +
+      fi
+      echo >> "${log}"
+  else
+    echo "Can not write to ${log}. Wrong volume permissions? Carrying on ..."
+  fi
+}
+
+owd="$(pwd)"
+copy_reference_files
+unset MAVEN_CONFIG
+
+cd "${owd}"
+unset owd
+
+exec "$@"

settings-docker.xml

+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                      https://maven.apache.org/xsd/settings-1.0.0.xsd">
+  <localRepository>/usr/share/maven/ref/repository</localRepository>
+</settings>

settings-maven.xml

+<?xml version="1.0"?>
+<settings>
+    <profiles>
+        <profile>
+            <id>nexus</id>
+            <repositories>
+                <repository>
+                    <id>Maven repository</id>
+                    <url>https://repo1.maven.org/maven2/</url>
+                    <snapshots>
+                        <enabled>false</enabled>
+                    </snapshots>
+                    <releases>
+                        <enabled>true</enabled>
+                    </releases>
+                </repository>
+                <repository>
+                    <id>Nexus repository</id>
+                    <url>https://www.joaolino.com/nexus/repository/maven-public</url>
+                    <releases>
+                        <enabled>true</enabled>
+                    </releases>
+                    <snapshots>
+                        <enabled>true</enabled>
+                    </snapshots>
+                </repository>
+            </repositories>
+            <pluginRepositories>
+                <pluginRepository>
+                    <id>Maven repository</id>
+                    <url>https://repo1.maven.org/maven2/</url>
+                    <snapshots>
+                        <enabled>false</enabled>
+                    </snapshots>
+                    <releases>
+                        <enabled>true</enabled>
+                    </releases>
+                </pluginRepository>
+                <pluginRepository>
+                    <id>Nexus repository</id>
+                    <url>https://www.joaolino.com/nexus/repository/maven-public</url>
+                    <releases>
+                        <enabled>true</enabled>
+                    </releases>
+                    <snapshots>
+                        <enabled>true</enabled>
+                    </snapshots>
+                </pluginRepository>
+            </pluginRepositories>
+        </profile>
+    </profiles>
+    <activeProfiles>
+        <!--make the profile active all the time -->
+        <activeProfile>nexus</activeProfile>
+    </activeProfiles>
+</settings>
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