node {
    def checkoutBranches = [:]
    def generateBranches = [:]
    generateBranches['generate git repo 1'] = {
        dir("/tmp/repo1") {
            sh "git init || true"
            sh "date > file1.txt"
            sh 'git add file1.txt'
            sh "git commit --message='commit 1-1'"
            sh "date > file2.txt"
            sh 'git add file2.txt'
            sh "git commit --message='commit 1-2'"
        }
    }
    generateBranches['generate git repo 2'] = {
        dir("/tmp/repo2") {
            sh "git init || true"
            sh "date > file1.txt"
            sh 'git add file1.txt'
            sh "git commit --message='commit 2-1'"
            sh "date > file2.txt"
            sh 'git add file2.txt'
            sh "git commit --message='commit 2-2'"
        }
    }
    parallel generateBranches
    checkoutBranches['checkout repo1'] = {
        checkout([ $class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [[ $class: 'RelativeTargetDirectory', relativeTargetDir: 'repo1' ]],
            submoduleCfg: [],
            userRemoteConfigs:[[ name: 'origin', url: '/tmp/repo1' ]]
        ])
    }
    checkoutBranches['checkout repo2'] = {
        checkout([ $class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [[ $class: 'RelativeTargetDirectory', relativeTargetDir: 'repo2' ]],
            submoduleCfg: [],
            userRemoteConfigs:[[ name: 'origin', url: '/tmp/repo2' ]]
        ])
    }
    parallel checkoutBranches
}