$ git clone -n https://src.fedoraproject.org/rpms/R-RPostgres.git /var/lib/mock/f39-build-1544671-36658/root/chroot_tmpdir/scmroot/R-RPostgres
Cloning into '/var/lib/mock/f39-build-1544671-36658/root/chroot_tmpdir/scmroot/R-RPostgres'...
$ git fetch origin 023f76a96f13a4f153570b905ef7ad57b91a89eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RPostgres
 * [new ref]         023f76a96f13a4f153570b905ef7ad57b91a89eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 023f76a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild