Traceback when trying to build package

[mnaser]

Hi there,

I'm trying to build the following code:

let
  pkgs = import <nixpkgs> {};
  mach-nix = import (builtins.fetchGit {
    url = "https://github.com/DavHau/mach-nix";
    ref = "refs/tags/3.4.0";
  }) {};
in
mach-nix.buildPythonApplication rec {
  pname = "keystone";
  version = "16.0.0";

  # Manually set version because pbr wants to get it from the git
  # upstream repository (and we are installing from tarball instead)
  PBR_VERSION = version;

  src = pkgs.fetchFromGitea {
    domain = "opendev.org";
    owner = "openstack";
    repo = pname;
    rev = version;
    sha256 = "sha256-tXTrN79jBOXdVLs4g0lrl1Bx8YYGYoPCedl1CzdQZcc=";
  };

  requirements = builtins.readFile "${src}/requirements.txt";
}

It's resulting in the following:

Traceback (most recent call last):
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generate.py", line 110, in <module>
    main()
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generate.py", line 103, in main
    do()
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generate.py", line 66, in do
    expr = generator.generate(reqs)
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generators/overides_generator.py", line 36, in generate
    pkgs = self.resolver.resolve(reqs)
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/resolver/resolvelib_resolver.py", line 83, in resolve
    remove_circles_and_print(nix_py_pkgs, self.nixpkgs)
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/deptree.py", line 97, in remove_circles_and_print
    print(format_tree(
  File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 81, in format_tree
    return u'\n'.join(lines)
  File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 53, in _format_tree
    format_node(child))])
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/deptree.py", line 78, in name
    if indexed_pkgs[node_name].build_inputs + indexed_pkgs[node_name].prop_build_inputs == []:
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'
error: builder for '/nix/store/is4v1wsxxryq0bfwgd8f0n616vbj9fz9-mach_nix_file.drv' failed with exit code 1;
       last 10 log lines:
       >     remove_circles_and_print(nix_py_pkgs, self.nixpkgs)
       >   File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/deptree.py", line 97, in remove_circles_and_print
       >     print(format_tree(
       >   File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 81, in format_tree
       >     return u'\n'.join(lines)
       >   File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 53, in _format_tree
       >     format_node(child))])
       >   File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/deptree.py", line 78, in name
       >     if indexed_pkgs[node_name].build_inputs + indexed_pkgs[node_name].prop_build_inputs == []:
       > TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'
       For full logs, run 'nix log /nix/store/is4v1wsxxryq0bfwgd8f0n616vbj9fz9-mach_nix_file.drv'.
(use '--show-trace' to show detailed location information)

I'm trying to troubleshoot but it seems like it's an actual bug...

[mnaser]

I added some print statements and it looks like the following is what fails it:

pysaml2
Traceback (most recent call last):
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generate.py", line 110, in <module>
    main()
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generate.py", line 103, in main
    do()
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generate.py", line 66, in do
    expr = generator.generate(reqs)
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/generators/overides_generator.py", line 36, in generate
    pkgs = self.resolver.resolve(reqs)
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/resolver/resolvelib_resolver.py", line 83, in resolve
    remove_circles_and_print(nix_py_pkgs, self.nixpkgs)
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/deptree.py", line 98, in remove_circles_and_print
    print(format_tree(
  File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 81, in format_tree
    return u'\n'.join(lines)
  File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 54, in _format_tree
    for result in _format_tree(child,
  File "/nix/store/1jq9cw7vi7ij3wzwkqa3nipc7h43zikf-python3-3.9.9-env/lib/python3.9/site-packages/tree_format/_text.py", line 67, in _format_tree
    format_node(children[-1]))])
  File "/nix/store/6dr20pzvf1k8y6804dw8q31nj4d7aamz-h88mkfsmnchwn89a3mbgh7d6ixy1di5l-source/mach_nix/deptree.py", line 78, in name
    if indexed_pkgs[node_name].build_inputs + indexed_pkgs[node_name].prop_build_inputs == []:
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

Further troubleshooting shows that this issue happens when it gets to cryptography as node_name.

[mnaser]

Interesting, adding the following:

providers.cryptography = "sdist";

helps get through it, but obviously that adds to the build time.