$ git clone -n https://src.fedoraproject.org/rpms/R-RPostgres.git /var/lib/mock/f38-build-side-42-init-devel-845798-28422/root/chroot_tmpdir/scmroot/R-RPostgres
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-845798-28422/root/chroot_tmpdir/scmroot/R-RPostgres'...
$ git fetch origin 236ea1a7a5ae78d2d9bb31b74e487ec5571cef50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RPostgres
 * [new ref]         236ea1a7a5ae78d2d9bb31b74e487ec5571cef50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 236ea1a Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild