$ git clone -n https://github.com/xcp-ng-rpms/gnutls.git /var/lib/mock/v8.3-incoming-10874-29365/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/v8.3-incoming-10874-29365/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin 4cb9f63af837bbfcab24f685674004cd5b479357:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/gnutls
 * [new ref]         4cb9f63af837bbfcab24f685674004cd5b479357 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cb9f63 Use main package to obsolete gnutls-dane