.gitignore

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+.#*
+.\#*

src/is/sudo/jenkins/Utils.groovy

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+package is.sudo.jenkins
+
+import com.cloudbees.groovy.cps.NonCPS
+
+class Utils {
+    @NonCPS
+    static String default_or_value(String value, String defval) {
+        if (value == null) {
+            return defval
+        }
+        return value
+    }
+
+    @NonCPS
+    static String dockerhub_account(String account) {
+        if (account == null) {
+            return "benediktkr"
+        }
+        return account
+    }
+
+    @NonCPS
+    static String docker_image_name(String project) {
+        return Utils.docker_image_name(project, null)
+    }
+
+    @NonCPS
+    static String trim_docker_postfix(String repo) {
+        if (repo.endsWith("-docker")) {
+            return repo.substring(0, repo.indexOf("-docker"))
+        }
+        return repo
+    }
+
+    @NonCPS
+    static String docker_image_name(String repo,  String account) {
+
+        def imgname = Utils.trim_docker_postfix(repo)
+        def acc = Utils.dockerhub_account(account)
+        return "${acc}/${imgname}"
+    }
+}

vars/dockerimg.groovy

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+import is.sudo.jenkins.Utils
+
+def call(Map config) {
+
+    String repo = "${env.JOB_NAME.split('/')[1]}"
+    String crontab = Utils.default_or_value(config.cron, "")
+
+    pipeline {
+        agent any
+
+        triggers {
+            cron crontab
+        }
+        options {
+            timestamps()
+            ansiColor("xterm")
+            disableConcurrentBuilds()
+        }
+
+        environment {
+            DOCKER_NAME=Utils.docker_image_name(repo)
+            DOCKER_TAG=Utils.default_or_value(config.tag, "latest")
+        }
+        stages {
+
+            stage('build') {
+                steps {
+                    sh "docker build -t ${DOCKER_NAME}:${DOCKER_TAG} ."
+                }
+            }
+
+            stage('push') {
+                steps {
+                    sh "docker push ${DOCKER_NAME}:${DOCKER_TAG}"
+                }
+            }
+
+            stage('push version tag') {
+                when {
+                    tag "v*"
+                }
+                steps {
+                    sh "docker tag ${DOCKER_NAME}:${DOCKER_TAG} ${DOCKER_NAME}:${TAG_NAME}"
+                    sh "docker push ${DOCKER_NAME}:${TAG_NAME}"
+                }
+            }
+
+        }
+    }
+}