$ git clone -n https://src.fedoraproject.org/rpms/R-readr.git /var/lib/mock/f38-build-side-42-init-devel-1045238-29761/root/chroot_tmpdir/scmroot/R-readr
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1045238-29761/root/chroot_tmpdir/scmroot/R-readr'...
$ git fetch origin 8ee13f25162e308a7873bdff5bcfc116850faf1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-readr
 * [new ref]         8ee13f25162e308a7873bdff5bcfc116850faf1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ee13f2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild