$ git clone -n https://src.fedoraproject.org/rpms/ghc-lens-aeson.git /var/lib/mock/f41-build-side-1-2883132-34500/root/chroot_tmpdir/scmroot/ghc-lens-aeson
Cloning into '/var/lib/mock/f41-build-side-1-2883132-34500/root/chroot_tmpdir/scmroot/ghc-lens-aeson'...
$ git fetch origin d711733be57d784e8baf4181331213d594a519b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-lens-aeson
 * [new ref]         d711733be57d784e8baf4181331213d594a519b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d711733 refresh .cabal revision