$ git clone -n https://src.fedoraproject.org/rpms/PyQt-builder.git /var/lib/mock/f42-build-3181730-40950/root/chroot_tmpdir/scmroot/PyQt-builder
Cloning into '/var/lib/mock/f42-build-3181730-40950/root/chroot_tmpdir/scmroot/PyQt-builder'...
$ git fetch origin 98dbce21eb0d234171772a6eb77a52d123e14189:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/PyQt-builder
 * [new ref]         98dbce21eb0d234171772a6eb77a52d123e14189 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98dbce2 Update to new upstream release 1.17.2 (#2334704)