$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-reify.git /var/lib/mock/f39-build-1965604-43292/root/chroot_tmpdir/scmroot/ghc-data-reify
Cloning into '/var/lib/mock/f39-build-1965604-43292/root/chroot_tmpdir/scmroot/ghc-data-reify'...
$ git fetch origin 16378df43b98db11e7c25a28a37889ef12df917b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-reify
 * [new ref]         16378df43b98db11e7c25a28a37889ef12df917b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16378df revised .cabal file