$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson.git /var/lib/mock/f40-build-744627-111787/root/chroot_tmpdir/scmroot/ghc-aeson
Cloning into '/var/lib/mock/f40-build-744627-111787/root/chroot_tmpdir/scmroot/ghc-aeson'...
$ git reset --hard 54bff12153f6e8f1a04f267e443b0f3c1a014785
HEAD is now at 54bff12 update to 2.1.2.1; add generically