$ git clone -n https://src.fedoraproject.org/rpms/mame.git /var/lib/mock/f40-build-1830844-24926/root/chroot_tmpdir/scmroot/mame
Cloning into '/var/lib/mock/f40-build-1830844-24926/root/chroot_tmpdir/scmroot/mame'...
$ git fetch origin 523769f44539a861843d9e1cd3ece8d771ea54e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mame
 * [new ref]         523769f44539a861843d9e1cd3ece8d771ea54e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 523769f Update to 0.268