$ git clone -n https://src.fedoraproject.org/rpms/plexus-io.git /var/lib/mock/f40-build-2435619-60784/root/chroot_tmpdir/scmroot/plexus-io
Cloning into '/var/lib/mock/f40-build-2435619-60784/root/chroot_tmpdir/scmroot/plexus-io'...
$ git fetch origin b0d345f11bf52b2a5b4d488350e83e9aa248582a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-io
 * [new ref]         b0d345f11bf52b2a5b4d488350e83e9aa248582a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0d345f Update to upstream version 3.4.2