$ git clone -n https://src.fedoraproject.org/rpms/cups.git /var/lib/mock/f40-build-2197760-51683/root/chroot_tmpdir/scmroot/cups
Cloning into '/var/lib/mock/f40-build-2197760-51683/root/chroot_tmpdir/scmroot/cups'...
$ git fetch origin 6f839d5bfa18b0ecfd5871c05088ba77e6cdf4f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cups
 * [new ref]         6f839d5bfa18b0ecfd5871c05088ba77e6cdf4f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f839d5 add weak dependency on cups-filters-driverless for F40+