lock('checkout') {
    def checkouts = [:]
    def threads = 8

    stage('Super Repo') {
        checkout([$class: 'GitSCM',
                branches: [[name: branch]],
                doGenerateSubmoduleConfigurations: false,
                extensions: [[$class: 'CleanCheckout'], [$class: 'ScmName', name: 'super']],
                submoduleCfg: [],
                userRemoteConfigs: [[url: "${gitBaseUrl}/${superRepo}"]]])

        def repos = readFile('.gitslave')
        def reposLines = repos.readLines()
        for (i = 0; i < threads; i++){
            checkouts["Thread ${i}"] = []
        }
        def idx = 0
        for (line in reposLines) {
            def repoInfo = line.split(' ')
            def repoUrl = repoInfo[0]
            def repoPath = repoInfo[1]
            def curatedRepoUrl = repoUrl.substring(4, repoUrl.length()-1)
            def curatedRepoPath = repoPath.substring(1, repoPath.length()-1)
            echo("Thread ${idx%threads}")
            checkouts["Thread ${idx%threads}"] << [path: curatedRepoPath, url: "${gitBaseUrl}/${curatedRepoUrl}"]
            idx++
        }
    }
    stage('GitSlave Repos') {
        def doCheckouts = [:]
        for (i = 0; i < threads; i++){
            def j = i
            doCheckouts["Thread ${j}"] = {
                for (co in checkouts["Thread ${j}"]) {
                    retry(3) {
                        checkout([$class: 'GitSCM',
                                branches: [[name: branch]],
                                doGenerateSubmoduleConfigurations: false,
                                extensions: [[$class: 'RelativeTargetDirectory', relativeTargetDir: co.path], [$class: 'CleanCheckout'], [$class: 'ScmName', name: co.path]],
                                submoduleCfg: [],
                                userRemoteConfigs: [[url: co.url]]])
                    }
                }
            }
        }
        parallel doCheckouts
    }