$ git clone -n https://src.fedoraproject.org/rpms/PyQt-builder.git /var/lib/mock/f42-build-side-1-3589293-46956/root/chroot_tmpdir/scmroot/PyQt-builder
Cloning into '/var/lib/mock/f42-build-side-1-3589293-46956/root/chroot_tmpdir/scmroot/PyQt-builder'...
$ git fetch origin 99823dc5a6f1451ed1039b8fb464191796aa39ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/PyQt-builder
 * [new ref]         99823dc5a6f1451ed1039b8fb464191796aa39ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99823dc 1.18.2