$ git clone -n https://src.fedoraproject.org/rpms/mame.git /var/lib/mock/f40-build-2658119-66917/root/chroot_tmpdir/scmroot/mame
Cloning into '/var/lib/mock/f40-build-2658119-66917/root/chroot_tmpdir/scmroot/mame'...
$ git fetch origin 015d0d15d8087a135c3e952e7ea163d9b2f4e3ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mame
 * [new ref]         015d0d15d8087a135c3e952e7ea163d9b2f4e3ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 015d0d1 Update to 0.264