$ git clone -n https://src.fedoraproject.org/rpms/libpq.git /var/lib/mock/f45-build-16787-491/root/chroot_tmpdir/scmroot/libpq
Cloning into '/var/lib/mock/f45-build-16787-491/root/chroot_tmpdir/scmroot/libpq'...
$ git fetch origin c534db6935b1e7296658a6c613ae6df73b811952:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpq
 * [new ref]         c534db6935b1e7296658a6c613ae6df73b811952 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c534db6 Use CentOS Stream test repository instead of Fedora