$ git clone -n https://src.fedoraproject.org/rpms/R-errors.git /var/lib/mock/f38-build-side-42-init-devel-974303-28922/root/chroot_tmpdir/scmroot/R-errors
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-974303-28922/root/chroot_tmpdir/scmroot/R-errors'...
$ git fetch origin c8ece188b833c4e17afd3a674a45c78f6ea890ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-errors
 * [new ref]         c8ece188b833c4e17afd3a674a45c78f6ea890ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8ece18 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild