jenkins

#!/bin/bash

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
CONTAINERS_DIR="${DIR}/.containers"

jenkinsVersion="1.580.2"
jenkinsPort="8080"
seedJobName="Seed"

dockerCmd="docker"

function updateGlobals() {
    containerName="$(basename "${BASH_SOURCE[0]}")-${jenkinsPort}"

    prefixCmd="sudo"
    jenkinsUrl="http://localhost:${jenkinsPort}"
    which boot2docker > /dev/null 2>&1
    if [[ $? == 0 ]]; then
        boot2dockerIp=$(boot2docker ip 2>/dev/null)
        jenkinsUrl="http://${boot2dockerIp}:${jenkinsPort}"
        prefixCmd=""
    fi
    containerDir="${CONTAINERS_DIR}/${containerName}"
    jenkinsDir="${containerDir}/jenkins-home"
    jenkinsUserHomeDir="${containerDir}/jenkins-root"
    jenkinsJobsDir="${jenkinsDir}/jobs"
    jenkinsPluginsDir="${jenkinsDir}/plugins"
    pluginUrlsFilename="plugin-urls.txt"
    pluginUrlsFile="${DIR}/${pluginUrlsFilename}"
    backupPluginsDir="${DIR}/.jenkins-plugins"
    backupPluginUrlsFile="${backupPluginsDir}/${pluginUrlsFilename}"
    seedJobConfigFile="${DIR}/seed-job-config.xml"
}

function start() {
    local projectPath="$1"
    local volumes=("${jenkinsDir}:/var/jenkins_home")
# if you want to add/edit the files in /root of the jenkins container
# uncomment the line below:
#    volumes+=("${jenkinsUserHomeDir}:/root")

    echo "Starting Jenkins..."

    if [[ -n "${projectPath}" ]]; then
        echo ">> Provided path to project [${projectPath}]"
        if [[ ! "${projectPath}" == /* ]]; then
            local originalProjectPath="${projectPath}"
            projectPath="${DIR}/${projectPath}"
            echo ">> Made relative path [${originalProjectPath}] absolute [${projectPath}]"
        fi
        if [[ -d "${projectPath}" ]]; then
            echo "   Will mount it to as read-only to [/source] within the container"
            volumes+=("${projectPath}:/source:ro")
        else
            echo "!! Project path [${projectPath}] is not an existing directory"
            exit 1
        fi
    else
        echo "!! No project path provided"
        echo -e
        usage
        exit 1
    fi

    removeContainer

    if [[ ! -d "${backupPluginsDir}" || $(diff "${pluginUrlsFile}" "${backupPluginUrlsFile}" > /dev/null 2>&1; echo $?) -ne 0 ]]; then
        echo ">> Downloading the plugins..."
        wget --input-file "${pluginUrlsFile}" --directory-prefix "${backupPluginsDir}" --continue -nv
        if [[ $? -ne 0 ]]; then
            echo "!! Error during downloading of the plugins"
            exit 1
        fi
        cp -f "${pluginUrlsFile}" "${backupPluginUrlsFile}"
        removeDir "${jenkinsPluginsDir}"
    fi
    if [[ ! -d "${jenkinsPluginsDir}" ]]; then
        echo ">> Copying plugins to Jenkins..."
        ${prefixCmd} mkdir -p "${jenkinsPluginsDir}"
        ${prefixCmd} cp -rf "${backupPluginsDir}/." "${jenkinsPluginsDir}/"
        echo ">> Pinning plugins to not be overridden by Jenkins' defaults..."
        for plugin in "${jenkinsPluginsDir}"/*.hpi; do
            ${prefixCmd} touch "${plugin}.pinned"
        done
    fi

    fixJobsDirAccess
    installSeedJob

    echo "Starting [${containerName}] container..."
    ${dockerCmd} run -d -p ${jenkinsPort}:8080 --name ${containerName} -u root $(printf " -v %s" "${volumes[@]}") jenkins:${jenkinsVersion}
    if [[ $? == 0 ]]; then
        echo ">> Container [${containerName}] started"
    else
        echo "!! An error occurred while starting container [${containerName}]"
        exit 1
    fi

    echo ">> Waiting for Jenkins to be fully up and loaded..."
    echo "   (this may take a few minutes on first run)"
    if [[ -n "${boot2dockerIp}" ]]; then
        echo "   (especially as boot2docker user, I've heard >10 minutes)"
    fi
    until ${dockerCmd} logs ${containerName} 2>&1 | grep "Jenkins is fully up and running" > /dev/null; do
        sleep 1s
    done

    triggerSeedJob
    echo -e
    echo "Jenkins is fully up and running at [${jenkinsUrl}]"
}

function fixJobsDirAccess() {
    echo ">> Make Jobs directory accessable for current user..."
    ${prefixCmd} mkdir -p "${jenkinsJobsDir}"
    ${prefixCmd} chown -R $USER "${jenkinsJobsDir}"
}

function installSeedJob() {
    echo ">> Creating [${seedJobName}] job..."
    local seedJobDir="${jenkinsJobsDir}/${seedJobName}"
    ${prefixCmd} mkdir -p "${seedJobDir}"
    ${prefixCmd} cp -f "${seedJobConfigFile}" "${seedJobDir}/config.xml"
}

function triggerSeedJob() {
    echo ">> Triggering a [${seedJobName}] Job build"
    curl -X POST "${jenkinsUrl}/job/${seedJobName}/build"
}

function getPublicJenkinsPortOfContainer() {
    ${dockerCmd} inspect --format='{{range $p, $conf := .NetworkSettings.Ports}}{{with $p | eq "8080/tcp"}}{{(index $conf 0).HostPort}}{{end}}{{end}}' ${containerName}
}

function status() {
    ${dockerCmd} ps -a ${containerName}
}

function stop() {
    echo "Stopping container [${containerName}]..."
    ${dockerCmd} stop ${containerName} > /dev/null 2>&1
    echo -e
    echo "Stopped container [${containerName}]"
}

function clear() {
    echo "Removing any existing jobs..."
    removeDir "${jenkinsJobsDir}/"
    fixJobsDirAccess
    installSeedJob
    echo ">> Triggering a Jenkins reload..."
    jenkinsPort="$(getPublicJenkinsPortOfContainer)"
    jenkinsUrl=$(eval echo ${jenkinsUrl})

    curl -X POST "${jenkinsUrl}/reload"
    until [[ $(curl -s -o /dev/null -w '%{http_code}' "${jenkinsUrl}") -eq 200 ]]; do
        sleep 1s
    done

    triggerSeedJob
    echo -e
    echo "Done clearing"
}

function removeContainer() {
    echo ">> Remove existing container called [${containerName}]"
    ${dockerCmd} rm -f ${containerName} > /dev/null 2>&1
}

function remove() {
    echo "Removing Jenkins..."
    removeContainer
    echo ">> Removing Jenkins working directory [${jenkinsDir}]"
    removeDir "${jenkinsDir}"
    echo -e
    echo "Done removing"
}

function removeAll() {
    echo "Removing all state..."
    for d in ${CONTAINERS_DIR}/*/; do
        containerName="$(basename "${d}")"
        jenkinsPort="$(echo "${containerName}" | sed 's/^.*-//')"
        updateGlobals
        echo ">> Removing container [${containerName}]..."
        removeContainer
    done
    echo ">> Removing containers state directory..."
    removeDir "${CONTAINERS_DIR}"
    echo ">> Removing plugins backup directory..."
    removeDir "${backupPluginsDir}"
    echo -e
    echo "Done removing all state"
}

function removeDir() {
    set -o xtrace
    ${prefixCmd} rm -r "$1"
    set +o xtrace
}

function usage() {
    echo "Usage: $(basename $0) <command> [<args>]"
    echo -e
    echo "Available commands:"
    echo "  start    PATH  [PORT]  Start Jenkins with given Gradle project, which must have the [jenkins-jobdsl] plugin configured"
    echo "  stop           [PORT]  Stop Jenkins"
    echo "  restart        [PORT]  Restart Jenkins"
    echo "  status                 Show if Jenkins is running or not"
    echo "  clear                  Remove all jobs from Jenkins"
    echo "                         [${jenkinsJobsDir}]"
    echo "  remove         [PORT]  Remove the Jenkins working directory"
    echo "                         [${jenkinsDir}]"
    echo "  remove-all     [PORT]  Remove all directories created by this script"
    echo "                         [${jenkinsDir}]"
    echo "                         [${jenkinsUserHomeDir}]"
    echo "                         [${backupPluginsDir}]"
}

function requires() {
    local command=$1
    which ${command} > /dev/null 2>&1 || { echo "!! This script requires [${command}] to be installed" && exit 1; }
}

requires 'docker'
requires 'curl'
requires 'wget'

updateGlobals

command=$1; shift
case "${command}" in
    start)
        if [[ $# -ge 2 ]]; then
            jenkinsPort="$2"
        fi
        updateGlobals

        start "$@"
        ;;
    stop)
        if [[ $# -ge 1 ]]; then
            jenkinsPort="$1"
        fi
        updateGlobals

        stop
        ;;
    restart)
        if [[ $# -ge 2 ]]; then
            jenkinsPort="$2"
        fi
        updateGlobals

        stop && start "$@"
        ;;
    status)
        status
        ;;
    clear)
        clear
        ;;
    remove)
        if [[ $# -ge 1 ]]; then
            jenkinsPort="$1"
        fi
        updateGlobals

        remove
        ;;
    remove-all)
        removeAll
        ;;
    *)
        usage
        exit 1
       ;;
esac