$ git clone -n https://src.fedoraproject.org/rpms/R-preprocessCore.git /var/lib/mock/f40-build-789196-135676/root/chroot_tmpdir/scmroot/R-preprocessCore
Cloning into '/var/lib/mock/f40-build-789196-135676/root/chroot_tmpdir/scmroot/R-preprocessCore'...
$ git fetch origin b3c83d033df5ef5b1f91ba6b1af57b420ec31966:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-preprocessCore
 * [new ref]         b3c83d033df5ef5b1f91ba6b1af57b420ec31966 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3c83d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild