$ git clone -n https://src.fedoraproject.org/rpms/postgresql-ip4r.git /var/lib/mock/f45-build-28771-633/root/chroot_tmpdir/scmroot/postgresql-ip4r
Cloning into '/var/lib/mock/f45-build-28771-633/root/chroot_tmpdir/scmroot/postgresql-ip4r'...
$ git fetch origin 8fab7ea1a579e80834b2f5093df0e2a958da91e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/postgresql-ip4r
 * [new ref]         8fab7ea1a579e80834b2f5093df0e2a958da91e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fab7ea Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild