$ git clone -n https://src.fedoraproject.org/rpms/R-generics.git /var/lib/mock/f38-build-side-42-init-devel-794828-28038/root/chroot_tmpdir/scmroot/R-generics
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-794828-28038/root/chroot_tmpdir/scmroot/R-generics'...
$ git fetch origin 53881bd38186f3dbf1312551c5032cf189cd5869:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-generics
 * [new ref]         53881bd38186f3dbf1312551c5032cf189cd5869 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53881bd Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild