bug#49168: ‘guix import pypi’ misses package dependencies

["Ludovic Courtès" <ludovic.courtes@inria.fr>]

Hi!

‘guix import pypi -r django-import-export’ does not include all the
inputs:

--8<---------------cut here---------------start------------->8---
$ guix build -L /tmp/mods python-django-import-export

[...]

starting phase `build'
running "python setup.py" with command "build" and parameters ()
Download error on https://pypi.org/simple/setuptools_scm/: [Errno -2] Name or service not known -- Some packages may not be found!
Download error on https://pypi.org/simple/setuptools-scm/: [Errno -2] Name or service not known -- Some packages may not be found!
Couldn't find index page for 'setuptools_scm' (maybe misspelled?)
Download error on https://pypi.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
No local packages or working download links found for setuptools_scm
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "setup.py", line 5, in <module>
    setup(
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/setuptools/__init__.py", line 144, in setup
    _install_setup_requires(attrs)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/setuptools/__init__.py", line 139, in _install_setup_requires
    dist.fetch_build_eggs(dist.setup_requires)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/setuptools/dist.py", line 716, in fetch_build_eggs
    resolved_dists = pkg_resources.working_set.resolve(
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/pkg_resources/__init__.py", line 780, in resolve
    dist = best[req.key] = env.best_match(
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1065, in best_match
    return self.obtain(req, installer)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1077, in obtain
    return installer(requirement)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/setuptools/dist.py", line 786, in fetch_build_egg
    return cmd.easy_install(req)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 673, in easy_install
    raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('setuptools_scm')
command "python" "-c" "import setuptools, tokenize;__file__='setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\\r\\n', '\\n');f.close();exec(compile(code, __file__, 'exec'))" "build" failed with status 1
builder for `/gnu/store/74ph75dfy1i9hrx9n327j32ma2zv4hhd-python-tablib-3.0.0.drv' failed with exit code 1
build of /gnu/store/74ph75dfy1i9hrx9n327j32ma2zv4hhd-python-tablib-3.0.0.drv failed
View build log at '/var/log/guix/drvs/74/ph75dfy1i9hrx9n327j32ma2zv4hhd-python-tablib-3.0.0.drv.bz2'.
cannot build derivation `/gnu/store/6xk0jk0qnjsazqgjihmpafsx3wfmxjf0-python-django-import-export-2.5.0.drv': 1 dependencies couldn't be built
guix build: error: build of `/gnu/store/6xk0jk0qnjsazqgjihmpafsx3wfmxjf0-python-django-import-export-2.5.0.drv' failed
$ cat /tmp/mods/django.scm
(define-module (django)
  #:use-module (guix)
  #:use-module (guix build-system python)
  #:use-module (gnu packages python)
  #:use-module (gnu packages python-xyz)
  #:use-module (gnu packages django)
  #:use-module ((guix licenses) #:prefix license:))

(define-public python-tablib
  (package
    (name "python-tablib")
    (version "3.0.0")
    (source
      (origin
        (method url-fetch)
        (uri (pypi-uri "tablib" version))
        (sha256
          (base32
            "03f1z6jq6rf67gwhbm9ma4rydm8h447a5nh5lcs5l8jg8l4aqg7q"))))
    (build-system python-build-system)
    (home-page "https://tablib.readthedocs.io")
    (synopsis
      "Format agnostic tabular data library (XLS, JSON, YAML, CSV)")
    (description
      "Format agnostic tabular data library (XLS, JSON, YAML, CSV)")
    (license license:expat)))

(define-public python-django-import-export
  (package
    (name "python-django-import-export")
    (version "2.5.0")
    (source
      (origin
        (method url-fetch)
        (uri (pypi-uri "django-import-export" version))
        (sha256
          (base32
            "0j0gsj18bkkmbn262qj2syla80vncvqn49bllwxvcgw0zhxh1763"))))
    (build-system python-build-system)
    (propagated-inputs
      `(("python-diff-match-patch"
         ,python-diff-match-patch)
        ("python-django" ,python-django)
        ("python-tablib" ,python-tablib)))
    (home-page
      "https://github.com/django-import-export/django-import-export")
    (synopsis
      "Django application and library for importing and exporting data with included admin integration.")
    (description
      "Django application and library for importing and exporting data with included admin integration.")
    (license license:bsd-3)))

--8<---------------cut here---------------end--------------->8---

Here, some of tablib’s dependencies are missing; the same problem seems
to happen with python-django-import-export itself.

Are we failing to parse some of the PyPI metadata?

Thanks,
Ludo’.