$ git clone -n https://src.fedoraproject.org/rpms/R-DBI.git /var/lib/mock/f45-build-5896-345/root/chroot_tmpdir/scmroot/R-DBI
Cloning into '/var/lib/mock/f45-build-5896-345/root/chroot_tmpdir/scmroot/R-DBI'...
$ git fetch origin 27158d36bb8d081a5b693eaab5c30a4c4939811e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-DBI
 * [new ref]         27158d36bb8d081a5b693eaab5c30a4c4939811e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27158d3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild