$ git clone -n https://src.fedoraproject.org/rpms/xtl.git /var/lib/mock/f40-build-2177549-51096/root/chroot_tmpdir/scmroot/xtl
Cloning into '/var/lib/mock/f40-build-2177549-51096/root/chroot_tmpdir/scmroot/xtl'...
$ git fetch origin b8adb7e8bc76bc0a61b39a8aec1f7756ac5c98f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xtl
 * [new ref]         b8adb7e8bc76bc0a61b39a8aec1f7756ac5c98f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8adb7e Update to latest version (#2255729)