This is a Jenkins pipeline script running on a Windows Server 2016 node

   stage('clone') {
            steps {
                script {
                    dir("${WORKSPACE}") {
                        if (fileExists("foobar")) {
                            echo 'Updating workspace for Foobar application'
                            dir ("${WORKSPACE}/foobar") {
                                bat ("git fetch origin master")
                            }
                        }  else {
                            echo 'Building Workspace for Foobar Application'
                            def command="git clone -c http.extraHeader='Authorization: Bearer <HTTPACCESSToken>' https://myserver:port/scm/psrc/foobar.git"
                            bat ("${command}")
                        }
                    }
                }
            }
        }

The string in the ‘command’ variable is correctly constructed and echoed to the build log. I can copy that echo into a PS terminal and the command executes perfectly. It also works perfectly in a plain DOS terminal.

However in Jenkins pipeline, the string is NOT properly parsed into DOS and I get:

fatal: Too many arguments.

usage: git clone [<options>] [--] <repo> [<dir>]

    -v, --[no-]verbose    be more verbose
    -q, --[no-]quiet      be more quiet

I can solve that issue with escaped double quotes surrounding the parameter for -c but then the GIT command does not properly use the header and I get a username prompt.

I am completely stuck right now. I have tried every possible manner of quoting and escaping of quotes and can not get this to work.