Nixpkgs: cachix is broken

[eadwu]

Issue description

It might be worth noting that to get to this point, other haskellPackages need to patched, https://pastebin.com/raw/1fbxxNie.
Namely its dependency servant-streaming-client.

src/Servant/Streaming/Client/Internal.hs:50:19: error:
    Variable not in scope:
      runStreamingResponse
        :: a1 -> (GenResponse a0 -> a0) -> IO BS.ByteString
   |
50 |     respStream <- runStreamingResponse <$> streamingRequest req
   |                   ^^^^^^^^^^^^^^^^^^^^

src/Servant/Streaming/Client/Internal.hs:50:44: error:
    Variable not in scope: streamingRequest :: Request -> m a1
   |
50 |     respStream <- runStreamingResponse <$> streamingRequest req
   |                                            ^^^^^^^^^^^^^^^^

Steps to reproduce

nix-build '<nixpkgs>' -A cachix

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

 - system: `"x86_64-linux"`
 - host os: `Linux 4.20.0, NixOS, 19.03.git.c8c39b4 (Koi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2pre6526_9f99d624`
 - channels(root): `"nixos-19.03pre162671.44b02b52ea6"`
 - nixpkgs: `$HOME/Downloads/nixpkgs`

[vcunat]

/cc upstream @domenkozar.

[domenkozar]

See https://github.com/cachix/cachix/pull/149 - I plan to merge that in a week or so.

[domenkozar]

For status follow https://github.com/cachix/cachix/pull/163 - blocked by upstream. Best way to install cachix is still via known good set:

$ nix-env -iA cachix -f https://cachix.org/api/v1/install

[lheckemann]

@domenkozar Is installation from nixpkgs a story that you intend to support consistently at some point, or something you're not willing to deal with (understandable)? In the latter case, I'd suggest adding a notice to nixpkgs on the preferred way of installing cachix and closing this issue.

[domenkozar]

Yes, I will do my best to support cachix in nixpkgs, but due to Haskell updates work in nixpkgs it's hard to guarantee anything.

I've patched the bug that's affecting the cachix in 673f50f4d95acac75d004e2befccd812b0bd611c and I'll make a release in next couple of days.

[Moredread]

@domenkozar will there be a backport to 19.03? Thanks for your work!

[domenkozar]

Pushed cachix 0.2.0 to nixpkgs master and 19.03 - it's going to be usable in a couple of hours.