$ git clone -n https://src.fedoraproject.org/rpms/libpq.git /var/lib/mock/f31-build-46789-26690/root/thebuilddir/tmp/scmroot/libpq
Cloning into '/var/lib/mock/f31-build-46789-26690/root/thebuilddir/tmp/scmroot/libpq'...
$ git reset --hard 6d90478bbcbaf3c08cae6ae568ff1adf9d08ef10
HEAD is now at 6d90478 New upstream version 11.4