$ git clone -n https://src.fedoraproject.org/rpms/dub.git /var/lib/mock/f39-build-2461388-61443/root/chroot_tmpdir/scmroot/dub
Cloning into '/var/lib/mock/f39-build-2461388-61443/root/chroot_tmpdir/scmroot/dub'...
$ git fetch origin 845d0ef663a42476e8d0842c9129dbb2db4f0228:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dub
 * [new ref]         845d0ef663a42476e8d0842c9129dbb2db4f0228 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 845d0ef Update to 1.33.1