Unable to mkPython python38 with Ansible - infinite recursion

[atcruice]

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mach-nix is my preferred method for Python environment management in nix. I'd value any assistance resolving this infinite recursion error.

Given

System:

• macOS 12.2.1 (21D62)
• Apple M1 Pro

I use niv to pin nix dependencies:

• nixpkgs release-21.11 d2caa9377539e3b5ff1272ac3aa2d15f3081069f
• mach-nix v3.4.0 fe5255e6fd8df57e9507b7af82fc59dda9e9ff2b

$ niv show
nixpkgs
  url: https://github.com/NixOS/nixpkgs/archive/d2caa9377539e3b5ff1272ac3aa2d15f3081069f.tar.gz
  owner: NixOS
  branch: release-21.11
  repo: nixpkgs
  type: tarball
  sha256: 0syx1mqpdm37zwpxfkmglcnb1swqvsgf6sff0q5ksnsfvqv38vh0
  rev: d2caa9377539e3b5ff1272ac3aa2d15f3081069f
  homepage: 
  url_template: https://github.com/<owner>/<repo>/archive/<rev>.tar.gz
  description: Nix Packages collection
mach-nix
  url: https://github.com/DavHau/mach-nix/archive/fe5255e6fd8df57e9507b7af82fc59dda9e9ff2b.tar.gz
  owner: DavHau
  branch: master
  repo: mach-nix
  type: tarball
  sha256: 19vh5qfqlml22d6mpi34nnbh71i259sh223l4dr4axar3byy1408
  rev: fe5255e6fd8df57e9507b7af82fc59dda9e9ff2b
  homepage: 
  url_template: https://github.com/<owner>/<repo>/archive/<rev>.tar.gz
  description: Create highly reproducible python environments
niv
  url: https://github.com/nmattia/niv/archive/5912c378c2f87e911f1bc7236202f69581406c9d.tar.gz
  owner: nmattia
  branch: master
  repo: niv
  type: tarball
  sha256: 1jhs562k3pk0xgwyf0m1h2bck4rivv9f3aznz8dslgby9g5mdnda
  rev: 5912c378c2f87e911f1bc7236202f69581406c9d
  homepage: https://github.com/nmattia/niv
  url_template: https://github.com/<owner>/<repo>/archive/<rev>.tar.gz
  description: Easy dependency management for Nix projects

When

Contents of shell.nix

let
  sources = import ./nix/sources.nix;
  pkgs = import sources.nixpkgs {};

  mach-nix = import sources.mach-nix {
    inherit pkgs;
    python = "python38";
  };

  customPython = mach-nix.mkPython {
    requirements = ''
      ansible==5.3.0
    '';
  };
in
  pkgs.mkShell {
    buildInputs = [
      customPython
    ];
  }

nix/sources.json and nix/sources.nix attached for reference: nix.zip

Then

Output from nix-shell

$ nix-shell
trace: removing dependency python3.8-pycrypto-3.11.0 from ansible
trace: 
applying fix 'no-rust-build' (nativeBuildInputs) for cryptography:3.3.2

trace: removing dependency python3.8-setuptools-rust-0.12.1 from cryptography
trace: removing dependency python3.8-paramiko-2.7.2 from ansible
trace: removing dependency python3.8-Cython-0.29.24 from pyyaml
trace: removing dependency python3.8-httplib2-0.20.1 from ansible
trace: removing dependency python3.8-netaddr-0.8.0 from ansible
trace: removing dependency python3.8-dnspython-2.1.0 from ansible
trace: removing dependency python3.8-jmespath-0.10.0 from ansible
trace: removing dependency python3.8-dopy-2016-01-04 from ansible
trace: removing dependency python3.8-ncclient-0.6.12 from ansible
error: infinite recursion encountered

       at /nix/store/ngbrnnj9p9vpqcd3kv6zfaz6lcnw4950-nixpkgs-src/pkgs/stdenv/generic/make-derivation.nix:170:8:

          169|       (map (drv: drv.__spliced.hostHost or drv) depsHostHostPropagated)
          170|       (map (drv: drv.crossDrv or drv) propagatedBuildInputs)
             |        ^
          171|     ]
(use '--show-trace' to show detailed location information)

I have also tried various combinations of:

• python39
• multiple earlier versions of ansible (back to v3.4.0)
• nixpkgs-unstable
• mach-nix v3.3.0 (different error) ERROR: MarkupSafe-2.0.1-cp38-cp38-macosx_10_9_x86_64.whl is not a supported wheel on this platform.
• mach-nix latest 7b0e7f6f58f7332c1b8347e2673036eada1a6998 (at time of writing)

[atcruice]

Can confirm the same error given older MacBook Pro system:

• macOS 11.6.4 (20G417)
• Intel CPU

[yqmmm]

A temporary fix would be to use nixpkgs provider. The version of ansible in nixpkgs is older though.

[putchar]

can confirm the same error with the following shell.nix on NixOS amd64

## cf https://nixos.org/manual/nix/stable/command-ref/nix-shell.html
let
  nixpkgs-version = "21.11";
  pkgs =
    import (fetchTarball
      "https://github.com/NixOS/nixpkgs/archive/nixos-${nixpkgs-version}.tar.gz") {};
  mach-nix =
    import (builtins.fetchGit {
      url = "https://github.com/DavHau/mach-nix";
      ref = "refs/tags/3.4.0";
    }) {
      inherit pkgs;
      python = "python39";
    };

  pythonEnv = mach-nix.mkPython {
    requirements = ''
      pillow
      numpy
      requests
      python-vagrant
      openshift
      netaddr
      jmespath
      ansible
      ansible-lint
      molecule==3.5.2
      molecule-vagrant
      molecule-docker
      pylint
    '';
  };
in
  pkgs.mkShell {
    name = "pythonEnv";
    buildInputs = [
      # Change your python version here
      pythonEnv
      # Add non-python packages here
      #pkgs.ansible
      #pkgs.ansible-lint
    ];
  }