$ git clone -n https://src.fedoraproject.org/rpms/R-remotes.git /var/lib/mock/f40-build-2305095-57060/root/chroot_tmpdir/scmroot/R-remotes
Cloning into '/var/lib/mock/f40-build-2305095-57060/root/chroot_tmpdir/scmroot/R-remotes'...
$ git fetch origin bac4db75a0b0937c033a49ac1afedaf5118de908:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-remotes
 * [new ref]         bac4db75a0b0937c033a49ac1afedaf5118de908 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bac4db7 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild