CI is broken: setuptools_scm ModuleNotFoundError: No module named 'tomli'

[carlosperate]

From the CI:

Collecting adafruit-board-toolkit~=1.1
  Downloading adafruit-board-toolkit-1.1.0.tar.gz (34 kB)
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
  Installing backend dependencies: started
  Installing backend dependencies: finished with status 'done'
    Preparing wheel metadata: started
    Preparing wheel metadata: finished with status 'error'
    ERROR: Command errored out with exit status 1:
     command: /Users/runner/hostedtoolcache/Python/3.6.14/x64/bin/python /Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py prepare_metadata_for_build_wheel /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/tmpy7xb811j
         cwd: /private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-install-szf6jl68/adafruit-board-toolkit_9dc3c74c56134dbb8ff383bfee2a5524
    Complete output (32 lines):
    Traceback (most recent call last):
      File "/Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 349, in <module>
        main()
      File "/Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 331, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File "/Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 151, in prepare_metadata_for_build_wheel
        return hook(metadata_directory, config_settings)
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 166, in prepare_metadata_for_build_wheel
        self.run_setup()
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 259, in run_setup
        self).run_setup(setup_script=setup_script)
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/overlay/lib/python3.6/site-packages/setuptools/build_meta.py", line 150, in run_setup
        exec(compile(code, __file__, 'exec'), locals())
      File "setup.py", line 54, in <module>
        packages=["adafruit_board_toolkit"],
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/overlay/lib/python3.6/site-packages/setuptools/__init__.py", line 153, in setup
        return distutils.core.setup(**attrs)
      File "/Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/distutils/core.py", line 108, in setup
        _setup_distribution = dist = klass(attrs)
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/overlay/lib/python3.6/site-packages/setuptools/dist.py", line 456, in __init__
        k: v for k, v in attrs.items()
      File "/Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/distutils/dist.py", line 281, in __init__
        self.finalize_options()
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/overlay/lib/python3.6/site-packages/setuptools/dist.py", line 807, in finalize_options
        ep(self)
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/normal/lib/python3.6/site-packages/setuptools_scm/integration.py", line 52, in infer_version
        config = Configuration.from_file(dist_name=dist_name)
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/normal/lib/python3.6/site-packages/setuptools_scm/config.py", line 187, in from_file
        defn = _load_toml(data)
      File "/private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-build-env-w917timz/normal/lib/python3.6/site-packages/setuptools_scm/config.py", line 59, in _lazy_tomli_load
        from tomli import loads
    ModuleNotFoundError: No module named 'tomli'
    ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/c8/bf/5f30ad39b4e781ed32dd5ddfadd75e1bc20710d78d7e5627f586e341687e/adafruit-board-toolkit-1.1.0.tar.gz#sha256=61e19c30854764230138f4c1d65bf3b5d6ef22866396b231df7123a5a2507f27 (from https://pypi.org/simple/adafruit-board-toolkit/) (requires-python:>=3.5.0). Command errored out with exit status 1: /Users/runner/hostedtoolcache/Python/3.6.14/x64/bin/python /Users/runner/hostedtoolcache/Python/3.6.14/x64/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py prepare_metadata_for_build_wheel /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/tmpy7xb811j Check the logs for full command output.
ERROR: Could not find a version that satisfies the requirement adafruit-board-toolkit~=1.1 (from mu-editor[dev]) (from versions: 1.0.0, 1.0.1, 1.1.0)
ERROR: No matching distribution found for adafruit-board-toolkit~=1.1

---

I can replicate locally if I remove the wheels from my pip cache and try to install adafruit-board-toolkit:

pip cache purge

pip uninstall adafruit-board-toolkit

pip install adafruit-board-toolkit~=1.1
Collecting adafruit-board-toolkit~=1.1
  Using cached adafruit-board-toolkit-1.1.0.tar.gz (34 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
    Preparing wheel metadata ... error
    ERROR: Command errored out with exit status 1:
     command: /Users/microbit-carlos/workspace/mine/mu-upstream/.venv/bin/python /Users/microbit-carlos/workspace/mine/mu-upstream/.venv/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/tmpb_dtciot
         cwd: /private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-install-zrqs2fhx/adafruit-board-toolkit
    Complete output (32 lines):
    Traceback (most recent call last):
      File "/Users/microbit-carlos/workspace/mine/mu-upstream/.venv/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 280, in <module>
        main()
      File "/Users/microbit-carlos/workspace/mine/mu-upstream/.venv/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 263, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File "/Users/microbit-carlos/workspace/mine/mu-upstream/.venv/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 133, in prepare_metadata_for_build_wheel
        return hook(metadata_directory, config_settings)
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 166, in prepare_metadata_for_build_wheel
        self.run_setup()
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 258, in run_setup
        super(_BuildMetaLegacyBackend,
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 150, in run_setup
        exec(compile(code, __file__, 'exec'), locals())
      File "setup.py", line 24, in <module>
        setup(
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/overlay/lib/python3.8/site-packages/setuptools/__init__.py", line 153, in setup
        return distutils.core.setup(**attrs)
      File "/Users/microbit-carlos/.pyenv/versions/3.8.2/lib/python3.8/distutils/core.py", line 108, in setup
        _setup_distribution = dist = klass(attrs)
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/overlay/lib/python3.8/site-packages/setuptools/dist.py", line 455, in __init__
        _Distribution.__init__(self, {
      File "/Users/microbit-carlos/.pyenv/versions/3.8.2/lib/python3.8/distutils/dist.py", line 292, in __init__
        self.finalize_options()
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/overlay/lib/python3.8/site-packages/setuptools/dist.py", line 807, in finalize_options
        ep(self)
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/normal/lib/python3.8/site-packages/setuptools_scm/integration.py", line 52, in infer_version
        config = Configuration.from_file(dist_name=dist_name)
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/normal/lib/python3.8/site-packages/setuptools_scm/config.py", line 187, in from_file
        defn = _load_toml(data)
      File "/private/var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/pip-build-env-zbr498da/normal/lib/python3.8/site-packages/setuptools_scm/config.py", line 59, in _lazy_tomli_load
        from tomli import loads
    ModuleNotFoundError: No module named 'tomli'
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Users/microbit-carlos/workspace/mine/mu-upstream/.venv/bin/python /Users/microbit-carlos/workspace/mine/mu-upstream/.venv/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /var/folders/jy/jkj1bwkd1blg0fd67553zct00000gn/T/tmpb_dtciot Check the logs for full command output.

We can see that the build requirements is the latest version of setuptools_scm:
https://github.com/adafruit/Adafruit_Board_Toolkit/blob/b6ed0c8f05f0b408114c5075a5377bea83c1f83e/setup.py#L27

[carlosperate]

This was just opened a few minutes ago, so it seems like a common issue that started with the latest release from about an hour ago: pypa/setuptools-scm#608

[carlosperate]

The setuptools-scm broken versions have been yanked and CI should start to work again:

[carlosperate]

This was resolved in the respective dependencies (although it did break again a couple of days later, but it was swiftly fixed again).