$ git clone -n https://src.fedoraproject.org/rpms/ntp-refclock.git /var/lib/mock/f45-build-19848-556/root/chroot_tmpdir/scmroot/ntp-refclock
Cloning into '/var/lib/mock/f45-build-19848-556/root/chroot_tmpdir/scmroot/ntp-refclock'...
$ git fetch origin fb5573bfc0bbf7b64eeddd6b486cb02b2059a567:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ntp-refclock
 * [new ref]         fb5573bfc0bbf7b64eeddd6b486cb02b2059a567 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb5573b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild