$ git clone -n https://src.fedoraproject.org/rpms/ghc-dns.git /var/lib/mock/f38-build-side-42-init-devel-1063374-29775/root/chroot_tmpdir/scmroot/ghc-dns
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1063374-29775/root/chroot_tmpdir/scmroot/ghc-dns'...
$ git fetch origin b84d7c7d2a94446fbd9a6aa2be998eed1233f72a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-dns
 * [new ref]         b84d7c7d2a94446fbd9a6aa2be998eed1233f72a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b84d7c7 Convert to %autorelease and %autochangelog