$ git clone -n https://src.fedoraproject.org/rpms/pcb-rnd.git /var/lib/mock/f40-build-2301069-56762/root/chroot_tmpdir/scmroot/pcb-rnd
Cloning into '/var/lib/mock/f40-build-2301069-56762/root/chroot_tmpdir/scmroot/pcb-rnd'...
$ git fetch origin b634096072a7c5c0fe394009a0a42682427fa7a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcb-rnd
 * [new ref]         b634096072a7c5c0fe394009a0a42682427fa7a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b634096 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild