def clone(Map gitConf, String base_branch, String path='projdir') {
    
    echo "-----> Check out project source from ${gitConf.address}:${base_branch}..."
    dir(path){
        git branch: "${base_branch}", 
            credentialsId: "${gitConf.credentialId}",
            url: "${gitConf.address}"
        def COMMIT_SHA = sh(returnStdout: true, script: 'git rev-parse --short HEAD').trim()
        return COMMIT_SHA
    }
}

return this