$ git clone -n https://src.fedoraproject.org/rpms/rubygem-timecop.git /var/lib/mock/f40-build-2323612-58726/root/chroot_tmpdir/scmroot/rubygem-timecop
Cloning into '/var/lib/mock/f40-build-2323612-58726/root/chroot_tmpdir/scmroot/rubygem-timecop'...
$ git fetch origin fe98bf68544f2906d49d4c5a9b87b90028defd3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-timecop
 * [new ref]         fe98bf68544f2906d49d4c5a9b87b90028defd3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe98bf6 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild