$ git clone -n https://github.com/xcp-ng-rpms/gnutls.git /var/lib/mock/v8.3-incoming-11390-29697/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/v8.3-incoming-11390-29697/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin 36d8ab3cc21007fad9f5e7966cad6165e97dcd52:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/gnutls
 * [new ref]         36d8ab3cc21007fad9f5e7966cad6165e97dcd52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36d8ab3 Merge pull request #3 from xcp-ng-rpms/pcoval/fix/review/master