$ git clone -n https://src.fedoraproject.org/rpms/ghc-dns.git /var/lib/mock/f39-build-1972836-43327/root/chroot_tmpdir/scmroot/ghc-dns
Cloning into '/var/lib/mock/f39-build-1972836-43327/root/chroot_tmpdir/scmroot/ghc-dns'...
$ git fetch origin d64ca629d539f3af8810c896c45eb8af93e4dc47:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-dns
 * [new ref]         d64ca629d539f3af8810c896c45eb8af93e4dc47 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d64ca62 https://hackage.haskell.org/package/dns-4.1.1/changelog