$ git clone -n https://src.fedoraproject.org/rpms/dub.git /var/lib/mock/f38-build-side-42-init-devel-622763-26355/root/chroot_tmpdir/scmroot/dub
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-622763-26355/root/chroot_tmpdir/scmroot/dub'...
$ git fetch origin b4c2b35158b097a2d6cabbf85333245df3a536da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dub
 * [new ref]         b4c2b35158b097a2d6cabbf85333245df3a536da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4c2b35 Exclude self tests on ppc64le as well