def mr_checkout_with_merge(url, account) {
  checkout changelog: true, poll: true, scm: [
    $class: 'GitSCM',
    branches: [[name: '${gitlabSourceBranch}']],
    doGenerateSubmoduleConfigurations: false,
    extensions: [
      [$class: 'RelativeTargetDirectory', relativeTargetDir: 'src'],
      [$class: 'UserIdentity', email: 'jenkins', name: 'jenkins'],
      [$class: 'SubmoduleOption', disableSubmodules: false, parentCredentials: true, recursiveSubmodules: true, reference: '', trackingSubmodules: false],
      [$class: 'PreBuildMerge', options: [fastForwardMode: 'NO_FF', mergeRemote: 'origin', mergeStrategy: 'default', mergeTarget: '${gitlabTargetBranch}']],
      [$class: 'CloneOption', depth: 0, noTags: false, reference: '', shallow: false, timeout: 60],
      [$class: 'GitLFSPull']
    ],
    submoduleCfg: [],
    userRemoteConfigs: [[credentialsId: account, url: url]]
  ]
}

ERROR: Branch not suitable for integration as it does not merge cleanly: Command "git merge --no-ff 6af4f83cc9f2fc96d68df589e9822acf2fbf7fee" returned status code 128:
 stdout: 
 stderr: Downloading data/test_data.tar.gz (106.24 MB)
 Error downloading object: data/test_data.tar.gz (1b3d845): Smudge error: Error downloading data/test_data.tar.gz (1b3d845ad0f78327a16db63e03a7bc60dd2f7134bbaeeb117c3602d037893eef): batch request: Permission denied (publickey).: exit status 255
Errors logged to /home/jenkins/workspace/Precommits/Ubuntu16/src/.git/lfs/objects/logs/20170626T055343.268201821.log
 Use `git lfs logs last` to view the log.
 error: external filter git-lfs smudge – %f failed 2
 error: external filter git-lfs smudge – %f failed
 fatal: data/test_data.tar.gz: smudge filter lfs failed