$ git clone -n https://src.fedoraproject.org/rpms/R-glue.git /var/lib/mock/f45-build-6142-346/root/chroot_tmpdir/scmroot/R-glue
Cloning into '/var/lib/mock/f45-build-6142-346/root/chroot_tmpdir/scmroot/R-glue'...
$ git fetch origin 0d6219a866708a367e20afddef929520cfc327a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-glue
 * [new ref]         0d6219a866708a367e20afddef929520cfc327a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d6219a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild