source: Jenkins/Promote @ 402a1e7

#!groovy

node {
        // Globals
        BuildDir   = pwd tmp: true
        SrcDir     = pwd tmp: false
        RemoteRepo = 'git@github.com:cforall/cforall.git'
        ArchiveUrl = 'https://cforall.uwaterloo.ca/jenkins/job/Cforall_Distribute_Ref/lastSuccessfulBuild/artifact/*zip*/archive.zip'

        // Local variables
        def err = null
        def log_needed = false

        currentBuild.result = "SUCCESS"

        //Wrap build to add timestamp to command line
        wrap([$class: 'TimestamperBuildWrapper']) {

                PrepRepo();

                def name = GetArchive();

                PushRepo(name);
        }

}

def GetTarName() {
        def files = findFiles(glob: 'archive/cfa-cc-*.tar.gz')
        echo "found: ${files[0].name}"
        return files[0].name - '.tar.gz';
}

def PrepRepo() {
        stage('Clone') { // for display purposes
                dir (BuildDir) {
                    sh 'rm -rf *'
                        sshagent (credentials: ['git_key_mar27']) {
                                sh "git clone --bare ${RemoteRepo} repo"
                        }
                        dir ('repo') {
                                sh "mkdir .git"
                                sh "mv * .git"
                                sh "git init"
                        }
                }
        }
}

def GetArchive() {
        def tarball
        stage('Unzip') { // for display purposes
                dir (BuildDir) {
                        sh "wget -q ${ArchiveUrl}"
                        sh "unzip archive.zip"
                        tarball = GetTarName();
                        sh "tar -xzf archive/${tarball}.tar.gz"
                        sh "mv ${tarball}/* repo/."
                }
        }

        return tarball
}

def PushRepo(name) {
        stage('Push') { // for display purposes
                dir ("${BuildDir}/repo") {
                        sh "git add -A"
                        sh "git status"
                        sh "git diff-index --quiet HEAD || git commit -m 'Push from build machine: ${name}'"
                        sshagent (credentials: ['git_key_mar27']) {
                                sh "git push origin master"
                        }
                }
        }
}