CEP-17 python_site_packages_path parameter not included in PackageRecord of solution

[jjhelmus]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

When creating an environment which includes a python package that includes the optional CEP-17 python_site_packages_path parameter, this parameter is not included in the PackageRecord of the solution determined by conda-libmamba-solver. The results in conda being unable to use this parameter to correctly place noarch: python package contents, see conda/conda#14256.

A small reproducer is:

from conda.base.context import context
from conda.models.match_spec import MatchSpec

context.__init__()
solver_backend = context.plugin_manager.get_cached_solver_backend()
solver = solver_backend(
    prefix="/fake/fake/fake",
    channels = ("jjhelmus/label/sp_path", ),
    subdirs = ("linux-64", "noarch"),
    specs_to_add=(MatchSpec("python=3.99.90"), ),
    repodata_fn="repodata.json",
    command="create"
)
solution = solver.solve_final_state()
python_record = solution[0]
print(f"version: {python_record.version}")
print(f"path: {python_record.python_site_packages_path}")

With CONDA_SOLVER=classic this returns:

version: 3.99.90
path: sample_path/from_the_file/index_json

vs CONDA_SOLVER=libmamba

version: 3.99.90
path: None

Conda Info

Local dev install of conda+conda-libmamba-solver:

❯ conda info

     active environment : base
    active env location : /Users/jhelmus/workspace/conda-libmamba-solver/conda-libmamba-solver/env
            shell level : 2
       user config file : /Users/jhelmus/.condarc
 populated config files : /Users/jhelmus/.condarc
          conda version : 24.9.3.dev34
    conda-build version : 24.9.0
         python version : 3.12.7.final.0
                 solver : libmamba (default)
       virtual packages : __archspec=1=m1
                          __conda=24.9.3.dev34=0
                          __osx=14.6.1=0
                          __unix=0=0
       base environment : /Users/jhelmus/workspace/conda-libmamba-solver/conda-libmamba-solver/env  (writable)
      conda av data dir : /Users/jhelmus/workspace/conda-libmamba-solver/conda-libmamba-solver/env/etc/conda
  conda av metadata url : None
           channel URLs : https://repo.anaconda.com/pkgs/main/osx-arm64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/osx-arm64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /Users/jhelmus/workspace/conda-libmamba-solver/conda-libmamba-solver/env/pkgs
                          /Users/jhelmus/.conda/pkgs
       envs directories : /Users/jhelmus/workspace/conda-libmamba-solver/conda-libmamba-solver/env/envs
                          /Users/jhelmus/.conda/envs
               platform : osx-arm64
             user-agent : conda/24.9.3.dev34 requests/2.32.3 CPython/3.12.7 Darwin/23.6.0 OSX/14.6.1 solver/libmamba conda-libmamba-solver/24.7.1.dev20+g8a9cf41 libmambapy/1.5.10
                UID:GID : 502:20
             netrc file : None
           offline mode : False

Conda Config

==> /Users/jhelmus/.condarc <==
add_pip_as_python_dependency: False
changeps1: False
ssl_verify: True
channels:
  - defaults
report_errors: False

==> envvars <==
allow_softlinks: False

Conda list

NA

Additional Context

No response

[jjhelmus]

Fairly certain support for this field needs to be added to mamba first. mamba-org/mamba#3558 looks to be the ticket for this work in mamba.