How do i find missing dependents using the port command?

[Gerben Wierda]

A while back I have done a lot of cleanup, using looking at dependents, reinstalling stuff so it no longer depends on, say, older versions of python, etc.

Now, recently I’ve started reaching certbot/letsencrypt warnings that my certificates are about to expire. I used to have a fully automatic setup that did the updates in the background. Apparently, that has died. And it turns out certbot doesn’t work anymore because some part of python is missing:

Traceback (most recent call last):
  File "/opt/local/bin/certbot", line 33, in <module>
    sys.exit(load_entry_point('certbot==1.18.0', 'console_scripts', 'certbot')())
  File "/opt/local/bin/certbot", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/main.py", line 2, in <module>
    from certbot._internal import main as internal_main
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/_internal/main.py", line 23, in <module>
    from certbot import crypto_util, configuration
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/crypto_util.py", line 34, in <module>
    from certbot import interfaces
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/interfaces.py", line 14, in <module>
    from certbot import configuration
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/configuration.py", line 8, in <module>
    from certbot import util
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/util.py", line 24, in <module>
    from certbot._internal import constants
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/certbot/_internal/constants.py", line 4, in <module>
    import pkg_resources
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3243, in <module>
    def _initialize_master_working_set():
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3226, in _call_aside
    f(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3255, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 568, in _build_master
    ws.require(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 886, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 772, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'chardet' distribution was not found and is required by acme

Other than that the cleaning up has removed chardet. Looking at chardet in what is available, I find:

py39-cchardet @2.1.7 (python, devel, textproc)
    cChardet is high speed universal character encoding detector.

py39-chardet @4.0.0 (python, devel, textproc)
    Universal character encoding detector

I suspect I need the chardet extension.

What is the way to find this out using a port command? 

Gerben Wierda (LinkedIn <https://www.linkedin.com/in/gerbenwierda>)
R&A Enterprise Architecture <https://ea.rna.nl/> (main site)
Book: Chess and the Art of Enterprise Architecture <https://ea.rna.nl/the-book/>
Book: Mastering ArchiMate <https://ea.rna.nl/the-book-edition-iii/>

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