code: function getMachineEnv(machine) {
    var child = require('child_process');
    var result = child.spawnSync('docker-machine', ['env', machine]);
  
    if (result.status === 0) {
      var str = result.stdout.toString();
      var expr = str
        .replace(new RegExp('export ', 'g'), 'envs.')
        .split('\n')
        .filter(function (line) {
          return line[0] !== '#';
        }).join(';')
  
      var envs = {};
      eval(expr);
      return envs;
    } else {
      throw Error(result.stderr)
    }
  }
docs: Returns the env vars for the given docker machine.