$ git clone -n https://src.fedoraproject.org/rpms/mame.git /var/lib/mock/f45-build-17982-506/root/chroot_tmpdir/scmroot/mame
Cloning into '/var/lib/mock/f45-build-17982-506/root/chroot_tmpdir/scmroot/mame'...
$ git fetch origin f8ace5bba969f11b87ea5a1a0e8a4c9237938933:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mame
 * [new ref]         f8ace5bba969f11b87ea5a1a0e8a4c9237938933 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8ace5b Update to 0.289