$ git clone -n https://src.fedoraproject.org/rpms/showtime.git /var/lib/mock/f42-build-side-1-3533131-46342/root/chroot_tmpdir/scmroot/showtime
Cloning into '/var/lib/mock/f42-build-side-1-3533131-46342/root/chroot_tmpdir/scmroot/showtime'...
$ git fetch origin 6e8a7a2e3afe158537dd0df6fb01e87ae9414744:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/showtime
 * [new ref]         6e8a7a2e3afe158537dd0df6fb01e87ae9414744 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e8a7a2 Update to 48.1