`poetry2nix` is now maintained out-of-tree with recent nixpkgs

[avdv]

Describe the bug
In #415, which upgraded the nixpkgs' revision:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6500b4580c2a1f3d0f980d32d285739d8e156d92' (2023-09-25)
  → 'github:NixOS/nixpkgs/fa804edfb7869c9fb230e174182a8a1a7e512c40' (2023-11-02)

there is this CI failure:

 error:
         … while calling the 'derivationStrict' builtin
  
           at /builtin/derivation.nix:9:12: (source not available)
  
         … while evaluating derivation 'python-requirements'
           whose name attribute is located at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/stdenv/generic/make-derivation.nix:311:7
  
         … while evaluating attribute 'text' of derivation 'python-requirements'
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/build-support/trivial-builders/default.nix:148:16:
  
            147|     runCommand name
            148|       { inherit text executable checkPhase allowSubstitutes preferLocalBuild;
               |                ^
            149|         passAsFile = [ "text" ];
  
         … while calling anonymous lambda
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:44:22:
  
             43|   mapAliases = aliases:
             44|     lib.mapAttrs (n: alias:
               |                      ^
             45|       removeDistribute
  
         … from call site
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:45:7:
  
             44|     lib.mapAttrs (n: alias:
             45|       removeDistribute
               |       ^
             46|         (removeRecurseForDerivations
  
         … while calling 'removeDistribute'
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:32:22:
  
             31|   # sets from building on Hydra.
             32|   removeDistribute = alias: with lib;
               |                      ^
             33|     if isDerivation alias then
  
         … from call site
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:33:8:
  
             32|   removeDistribute = alias: with lib;
             33|     if isDerivation alias then
               |        ^
             34|       dontDistribute alias
  
         … while calling 'isDerivation'
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/lib/attrsets.nix:670:5:
  
            669|     # Value to check.
            670|     value: value.type or null == "derivation";
               |     ^
            671|
  
         … from call site
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:46:10:
  
             45|       removeDistribute
             46|         (removeRecurseForDerivations
               |          ^
             47|           (checkInPkgs n alias)))
  
         … while calling 'removeRecurseForDerivations'
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:25:33:
  
             24|   # to appear while listing all the packages available.
             25|   removeRecurseForDerivations = alias: with lib;
               |                                 ^
             26|     if alias.recurseForDerivations or false
  
         … from call site
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:47:12:
  
             46|         (removeRecurseForDerivations
             47|           (checkInPkgs n alias)))
               |            ^
             48|       aliases;
  
         … while calling 'checkInPkgs'
  
           at /nix/store/a56i1y5js340dn1w9r767a8jp34k31n4-source/pkgs/top-level/aliases.nix:38:20:
  
             37|   # Make sure that we are not shadowing something from all-packages.nix.
             38|   checkInPkgs = n: alias:
               |                    ^
             39|     if builtins.hasAttr n super
  
         error: poetry2nix is now maintained out-of-tree. Please use https://github.com/nix-community/poetry2nix/

To Reproduce

1. run nix flake update
2. cd testing/python
3. bazel test

Expected behavior
We should be able to use poetry2nix. But it seems we have to get it from a different source now.

Environment

• OS name + version: Github Actions / ubuntu + macos
• Version of the code: 89ccb0c

Additional context

https://github.com/nix-community/poetry2nix/