$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtserialbus.git /var/lib/mock/f42-build-side-1-3579934-46816/root/chroot_tmpdir/scmroot/qt5-qtserialbus
Cloning into '/var/lib/mock/f42-build-side-1-3579934-46816/root/chroot_tmpdir/scmroot/qt5-qtserialbus'...
$ git fetch origin de3909f4a8b55e6d64a71fe5db10d3bb57615509:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtserialbus
 * [new ref]         de3909f4a8b55e6d64a71fe5db10d3bb57615509 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de3909f 5.15.17