can't install on docker + nix-2.3 (nixos-19.09)

[tim2CF]

Steps to reproduce:

   #!/bin/sh

   docker run -it --rm \
     -v "nix:/nix" \
     nixos/nix:2.3 sh -c "
     nix-channel --add https://nixos.org/channels/nixos-19.09 nixpkgs &&
     nix-channel --update &&
     nix-env -iA nixpkgs.haskellPackages.network_3_1_0_1 &&
     sh
     "

causes error

Failures:

  tests/Network/SocketSpec.hs:43:9:
  1) Network.Socket.bind successfully binds to an ipv6 socket
       uncaught exception: IOException of type UnsupportedOperation
       Network.Socket.bind: unsupported operation (Cannot assign requested address)

  To rerun use: --match "/Network.Socket/bind/successfully binds to an ipv6 socket/"

Randomized with seed 1342511728

Finished in 0.2589 seconds
48 examples, 1 failure
Test suite spec: FAIL

the same error for latest release v3.1.1.1

[kazu-yamamoto]

@tim2CF Does your system support IPv6?

[tim2CF]

Docker supports IPv6 only if your host system is Linux.
I'm running docker on Mac, and have this issue. I assume Windows users have it as well.
Is IPv6 so required feature to use this library? Because previous versions of it worked just fine.
IPv6 support for Mac/Windows was reported multiple times, but docker team just ignoring it. Many developers need to use docker nowdays because of different reasons, it's necessary evil :(

[kazu-yamamoto]

OK. I will think how we can improve this test case.

[tim2CF]

thanks!

[kazu-yamamoto]

@eborden @Mistuke I cannot find any ways to detect IPv6-capability of a host or to check if "::1" is assigned to any network interface. Do you know any?

If we all don't know, I would like to propose simply disabling this test item.

[Mistuke]

@eborden @Mistuke I cannot find any ways to detect IPv6-capability of a host or to check if "::1" is assigned to any network interface. Do you know any?

If we all don't know, I would like to propose simply disabling this test item.

On Windows the WSCEnumProtocol API can be used to detect if the host has support for a particular protocol.