$ git clone -n https://src.fedoraproject.org/rpms/R-remotes.git /var/lib/mock/f40-build-2257608-54327/root/chroot_tmpdir/scmroot/R-remotes
Cloning into '/var/lib/mock/f40-build-2257608-54327/root/chroot_tmpdir/scmroot/R-remotes'...
$ git fetch origin 8264b81cd01bf725d3e7367eb46e9cbf45768d4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-remotes
 * [new ref]         8264b81cd01bf725d3e7367eb46e9cbf45768d4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8264b81 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild