$ git clone -n https://src.fedoraproject.org/rpms/ghc-dns.git /var/lib/mock/f41-build-side-1-2805274-32863/root/chroot_tmpdir/scmroot/ghc-dns
Cloning into '/var/lib/mock/f41-build-side-1-2805274-32863/root/chroot_tmpdir/scmroot/ghc-dns'...
$ git fetch origin 7095a4ff238a16761b619bd4de30ea59caaf2aaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-dns
 * [new ref]         7095a4ff238a16761b619bd4de30ea59caaf2aaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7095a4f https://hackage.haskell.org/package/dns-4.2.0/changelog