$ git clone -n https://src.fedoraproject.org/rpms/libretro-stella2014.git /var/lib/mock/f40-build-2008279-45359/root/chroot_tmpdir/scmroot/libretro-stella2014
Cloning into '/var/lib/mock/f40-build-2008279-45359/root/chroot_tmpdir/scmroot/libretro-stella2014'...
$ git fetch origin 91a77b086ee93c76880f6aa46e8beb1ca2aad1d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libretro-stella2014
 * [new ref]         91a77b086ee93c76880f6aa46e8beb1ca2aad1d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91a77b0 chore: Update to latest git snapshot