$ git clone -n https://src.fedoraproject.org/rpms/R-servr.git /var/lib/mock/f38-build-side-42-init-devel-613048-26292/root/chroot_tmpdir/scmroot/R-servr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-613048-26292/root/chroot_tmpdir/scmroot/R-servr'...
$ git fetch origin dc0c7d6ec5a266c0add22ffbc52db264ff7da4aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-servr
 * [new ref]         dc0c7d6ec5a266c0add22ffbc52db264ff7da4aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc0c7d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild