$ git clone -n https://src.fedoraproject.org/rpms/R-generics.git /var/lib/mock/f40-build-2323300-58707/root/chroot_tmpdir/scmroot/R-generics
Cloning into '/var/lib/mock/f40-build-2323300-58707/root/chroot_tmpdir/scmroot/R-generics'...
$ git fetch origin bbf11876719ccadc4d5eb7872fc53fbca4c4fbb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-generics
 * [new ref]         bbf11876719ccadc4d5eb7872fc53fbca4c4fbb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbf1187 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild