utils/pypi: allow only updating extra_packages

[cho-m]

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---

Goal of PR is to allow easier updating of Python resources for formulae that aren't Python packages. In future, may allow brew bump to automatically run this (currently not done for non-PyPI URLs).

To give an example, the resources within the python formula

• Current state:

  ❯ brew update-python-resources python@3.12
  Error: Unable to determine metadata for "https://www.python.org/ftp/python/3.12.2/Python-3.12.2.tgz" because of a failure when running
  `/opt/homebrew/opt/python@3.12/libexec/bin/python -m pip install -q --no-deps --dry-run --ignore-installed --report /dev/stdout https://www.python.org/ftp/python/3.12.2/Python-3.12.2.tgz`.
  Please report this issue:
    https://docs.brew.sh/Troubleshooting

• With PR, need to add diff to get subsequent output:

  diff --git a/pypi_formula_mappings.json b/pypi_formula_mappings.json
  index 9718573087a..619c6da0d48 100644
  --- a/pypi_formula_mappings.json
  +++ b/pypi_formula_mappings.json
  @@ -588,6 +588,7 @@
       "extra_packages": ["flit-core", "setuptools", "pip", "wheel"]
     },
     "python@3.12": {
  +    "package_name": "",
       "extra_packages": ["flit-core", "setuptools", "pip", "wheel"]
     },
     "python-build": {

  ❯ brew update-python-resources python@3.12
  ==> Retrieving PyPI dependencies for "flit-core setuptools pip wheel"...
  ==> Retrieving PyPI dependencies for excluded ""...
  ==> Getting PyPI info for "flit-core==3.9.0"
  ==> Getting PyPI info for "pip==24.0"
  ==> Getting PyPI info for "setuptools==69.1.1"
  ==> Getting PyPI info for "wheel==0.42.0"
  ==> Updating resource blocks

[p-linnane]

cc @alex @branchvincent @timsutton and @woodruffw who may be interested in this.

[alex]

I think this means that we could remove this: https://github.com/Homebrew/brew-pip-audit/blob/main/generate-prs.rb#L19-L20

It'd be able to automatically bump the python packages used by those formula, is that right?

[woodruffw]

Makes sense to me, thanks @cho-m!

[woodruffw]

It'd be able to automatically bump the python packages used by those formula, is that right?

That's my understanding!

[MikeMcQuaid]

Looks good so far! One tweak.

[branchvincent]

nice!

[MikeMcQuaid]

Thanks again @cho-m!