`ImportError` when running pyproject.toml-based build, since the build-backend can't be found

[srepollock]

Description

Currently unable to install packages with the latest release of pip

Expected behavior

No response

pip version

23.0

Python version

3.10

OS

docker ubuntu20.04

How to Reproduce

1. use:

RUN add-apt-repository ppa:deadsnakes/ppa \
    && apt update
# NOTE: Must use python3.10 due to finta 2023-01-30
RUN apt install -y python3.10 python3.10-distutils \
    && ln -fs /usr/bin/python3.10 /usr/bin/python3 \
    && curl -sS https://bootstrap.pypa.io/get-pip.py | python3

Output

#21 0.871 Requirement already satisfied: pip in /usr/local/lib/python3.10/dist-packages (22.3.1)
#21 1.012 Collecting pip
#21 1.018   Using cached pip-23.0-py3-none-any.whl (2.1 MB)
#21 1.093 Installing collected packages: pip
#21 1.093   Attempting uninstall: pip
#21 1.094     Found existing installation: pip 22.3.1
#21 1.260     Uninstalling pip-22.3.1:
#21 1.449       Successfully uninstalled pip-22.3.1
#21 2.530 Successfully installed pip-23.0
#21 2.530 WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
#21 3.013 Requirement already satisfied: wheel in /usr/local/lib/python3.10/dist-packages (from -r /requirements.txt (line 2)) (0.38.4)
#21 3.115 Requirement already satisfied: setuptools in /usr/local/lib/python3.10/dist-packages (from -r /requirements.txt (line 3)) (67.0.0)
#21 16.99 Collecting rsa<4.8,>=3.1.2
#21 17.01   Downloading rsa-4.7.2-py3-none-any.whl (34 kB)
#21 17.09 Collecting PyYAML<5.5,>=3.10
#21 17.11   Downloading PyYAML-5.4.1.tar.gz (175 kB)
#21 17.13      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 175.1/175.1 kB 13.2 MB/s eta 0:00:00
#21 17.31   Installing build dependencies: started
#21 20.70   Installing build dependencies: finished with status 'done'
#21 20.70   Getting requirements to build wheel: started
#21 20.74   Getting requirements to build wheel: finished with status 'done'
#21 20.75 ERROR: Exception:
#21 20.75 Traceback (most recent call last):
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/cli/base_command.py", line 160, in exc_logging_wrapper
#21 20.75     status = run_func(*args)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/cli/req_command.py", line 247, in wrapper
#21 20.75     return func(self, options, args)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/commands/install.py", line 415, in run
#21 20.75     requirement_set = resolver.resolve(
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/resolver.py", line 92, in resolve
#21 20.75     result = self._result = resolver.resolve(
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 481, in resolve
#21 20.75     state = resolution.resolve(requirements, max_rounds=max_rounds)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 373, in resolve
#21 20.75     failure_causes = self._attempt_to_pin_criterion(name)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 213, in _attempt_to_pin_criterion
#21 20.75     criteria = self._get_updated_criteria(candidate)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 204, in _get_updated_criteria
#21 20.75     self._add_to_criteria(criteria, requirement, parent=candidate)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/resolvelib/resolvers.py", line 172, in _add_to_criteria
#21 20.75     if not criterion.candidates:
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/resolvelib/structs.py", line 151, in __bool__
#21 20.75     return bool(self._sequence)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 155, in __bool__
#21 20.75     return any(self)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 143, in <genexpr>
#21 20.75     return (c for c in iterator if id(c) not in self._incompatible_ids)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 47, in _iter_built
#21 20.75     candidate = func()
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/factory.py", line 206, in _make_candidate_from_link
#21 20.75     self._link_candidate_cache[link] = LinkCandidate(
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 297, in __init__
#21 20.75     super().__init__(
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 162, in __init__
#21 20.75     self.dist = self._prepare()
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 231, in _prepare
#21 20.75     dist = self._prepare_distribution()
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/resolution/resolvelib/candidates.py", line 308, in _prepare_distribution
#21 20.75     return preparer.prepare_linked_requirement(self._ireq, parallel_builds=True)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/operations/prepare.py", line 491, in prepare_linked_requirement
#21 20.75     return self._prepare_linked_requirement(req, parallel_builds)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/operations/prepare.py", line 577, in _prepare_linked_requirement
#21 20.75     dist = _get_prepared_distribution(
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/operations/prepare.py", line 69, in _get_prepared_distribution
#21 20.75     abstract_dist.prepare_distribution_metadata(
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/distributions/sdist.py", line 48, in prepare_distribution_metadata
#21 20.75     self._install_build_reqs(finder)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/distributions/sdist.py", line 118, in _install_build_reqs
#21 20.75     build_reqs = self._get_build_requires_wheel()
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/distributions/sdist.py", line 95, in _get_build_requires_wheel
#21 20.75     return backend.get_requires_for_build_wheel()
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_internal/utils/misc.py", line 701, in get_requires_for_build_wheel
#21 20.75     return super().get_requires_for_build_wheel(config_settings=cs)
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/pyproject_hooks/_impl.py", line 166, in get_requires_for_build_wheel
#21 20.75     return self._call_hook('get_requires_for_build_wheel', {
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/pyproject_hooks/_impl.py", line 321, in _call_hook
#21 20.75     raise BackendUnavailable(data.get('traceback', ''))
#21 20.75 pip._vendor.pyproject_hooks._impl.BackendUnavailable: Traceback (most recent call last):
#21 20.75   File "/usr/local/lib/python3.10/dist-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 77, in _build_backend
#21 20.75     obj = import_module(mod_path)
#21 20.75   File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
#21 20.75     return _bootstrap._gcd_import(name[level:], package, level)
#21 20.75   File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
#21 20.75   File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
#21 20.75   File "<frozen importlib._bootstrap>", line 992, in _find_and_load_unlocked
#21 20.75   File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
#21 20.75   File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
#21 20.75   File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
#21 20.75   File "<frozen importlib._bootstrap>", line 1004, in _find_and_load_unlocked
#21 20.75 ModuleNotFoundError: No module named 'setuptools'

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[dnicolodi]

I think this is the issue fixed by #11740.

[srepollock]

Upgraded Dockerfile to use Ubuntu 22.04 did correct the error.

Still seems to be an error for 20.04.

[njzjz]

What's the workaround for the old ubuntu images? For some reason, I cannot bump the ubuntu version.

[vmarkovtsev]

I am running on 22.04 and this error still happens. Shall we reopen?

[uranusjr]

I can not reproduce on Ubuntu 22.04 with this:

FROM ubuntu:22.04

RUN apt-get update \
 && apt-get install -y software-properties-common \
 && add-apt-repository ppa:deadsnakes/ppa \
 && apt-get update \
 && apt-get install -y build-essential curl python3.10-distutils python3.10-dev \
 && curl -sS https://bootstrap.pypa.io/get-pip.py | python3.10

RUN python3.10 -m pip install --no-binary=pyyaml pyyaml==5.4.1

This builds cleanly. Please provide a reproduction if you see errors.

[srepollock]

Change to use ubuntu:20.04