$ git clone -n https://src.fedoraproject.org/rpms/knot-resolver.git /var/lib/mock/f39-build-2387146-60495/root/chroot_tmpdir/scmroot/knot-resolver
Cloning into '/var/lib/mock/f39-build-2387146-60495/root/chroot_tmpdir/scmroot/knot-resolver'...
$ git fetch origin 6d20d5d644c0a272f1acd1d3c6dc00852819d746:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/knot-resolver
 * [new ref]         6d20d5d644c0a272f1acd1d3c6dc00852819d746 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d20d5d Rebuild for Knot DNS 3.3