$ git clone -n https://src.fedoraproject.org/rpms/cpuinfo.git /var/lib/mock/f40-build-2483816-61639/root/chroot_tmpdir/scmroot/cpuinfo
Cloning into '/var/lib/mock/f40-build-2483816-61639/root/chroot_tmpdir/scmroot/cpuinfo'...
$ git fetch origin ee4a3030765bd7dd7b80d3de1971a05aa00d55c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpuinfo
 * [new ref]         ee4a3030765bd7dd7b80d3de1971a05aa00d55c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee4a303 Prepare for the next cpuinfo