$ git clone -n https://src.fedoraproject.org/rpms/python-qt5.git /var/lib/mock/f40-build-735675-106456/root/chroot_tmpdir/scmroot/python-qt5
Cloning into '/var/lib/mock/f40-build-735675-106456/root/chroot_tmpdir/scmroot/python-qt5'...
$ git fetch origin a41b03e23316577a8c4cfacfac93afe7a332905e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-qt5
 * [new ref]         a41b03e23316577a8c4cfacfac93afe7a332905e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a41b03e Rebuild (qt5)