$ git clone -n https://src.fedoraproject.org/rpms/qpdfview.git /var/lib/mock/f40-build-747409-113167/root/chroot_tmpdir/scmroot/qpdfview
Cloning into '/var/lib/mock/f40-build-747409-113167/root/chroot_tmpdir/scmroot/qpdfview'...
$ git fetch origin 62d03b6698ed7c186266ad8e5438e2afcaa28695:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qpdfview
 * [new ref]         62d03b6698ed7c186266ad8e5438e2afcaa28695 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62d03b6 Add qpdfview-stdc++17.patch