Install fails due to "pip" or "setuptools" import in setup.py

[jdb78]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• Same error on Windows 10, Amazon Linux 2, and Ubuntu:
• Poetry version 1.2.0:
• Link of a Gist with the contents of your pyproject.toml file:

Issue

Adding "pandoc" to dependencies leads to an install error via poetry. Installing via "pip" directly succeeds:

  Command ['/home/ec2-user/environment/.../.venv/bin/python', '/home/ec2-user/.local/share/pypoetry/venv/lib64/python3.7/site-packages/virtualenv/seed/wheels/embed/pip-22.2.2-py3-none-any.whl/pip', 'install', '--use-pep517', '--disable-pip-version-check', '--prefix', '/home/ec2-user/environment/.../.venv', '--no-deps', '/home/ec2-user/.cache/pypoetry/artifacts/68/1b/01/40e9b347306cf5956f2b25567dc3206a72ec9e77eb0da7eb26dca212e4/pandoc-2.2.tar.gz'] errored with the following return code 1, and output: 
  Processing /home/ec2-user/.cache/pypoetry/artifacts/68/1b/01/40e9b347306cf5956f2b25567dc3206a72ec9e77eb0da7eb26dca212e4/pandoc-2.2.tar.gz
    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 'error'
    error: subprocess-exited-with-error
    
    × Getting requirements to build wheel did not run successfully.
    │ exit code: 1
    ╰─> [23 lines of output]
        Traceback (most recent call last):
          File "<string>", line 7, in <module>
        ModuleNotFoundError: No module named 'pip'
        
        During handling of the above exception, another exception occurred:
        
        Traceback (most recent call last):
          File "/tmp/tmpzve1wlyp_in_process.py", line 363, in <module>
            main()
          File "/tmp/tmpzve1wlyp_in_process.py", line 345, in main
            json_out['return_val'] = hook(**hook_input['kwargs'])
          File "/tmp/tmpzve1wlyp_in_process.py", line 130, in get_requires_for_build_wheel
            return hook(config_settings)
          File "/tmp/pip-build-env-8w54ypyd/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 338, in get_requires_for_build_wheel
            return self._get_build_requires(config_settings, requirements=['wheel'])
          File "/tmp/pip-build-env-8w54ypyd/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 320, in _get_build_requires
            self.run_setup()
          File "/tmp/pip-build-env-8w54ypyd/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 482, in run_setup
            super(_BuildMetaLegacyBackend,
          File "/tmp/pip-build-env-8w54ypyd/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 335, in run_setup
            exec(code, locals())
          File "<string>", line 12, in <module>
        ImportError: pip is not installed, refer to <http://pip.readthedocs.org> for instructions.
        [end of output]
    
    note: This error originates from a subprocess, and is likely not a problem with pip.
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  

  at ~/.local/share/pypoetry/venv/lib64/python3.7/site-packages/poetry/utils/env.py:1473 in _run
      1469│                 output = subprocess.check_output(
      1470│                     command, stderr=subprocess.STDOUT, env=env, **kwargs
      1471│                 )
      1472│         except CalledProcessError as e:
    → 1473│             raise EnvCommandError(e, input=input_)
      1474│ 
      1475│         return decode(output)
      1476│ 
      1477│     def execute(self, bin: str, *args: str, **kwargs: Any) -> int:

The following error occurred when trying to handle this error:


  PoetryException

  Failed to install /home/ec2-user/.cache/pypoetry/artifacts/68/1b/01/40e9b347306cf5956f2b25567dc3206a72ec9e77eb0da7eb26dca212e4/pandoc-2.2.tar.gz

  at ~/.local/share/pypoetry/venv/lib64/python3.7/site-packages/poetry/utils/pip.py:51 in pip_install
       47│ 
       48│     try:
       49│         return environment.run_pip(*args)
       50│     except EnvCommandError as e:
    →  51│         raise PoetryException(f"Failed to install {path.as_posix()}") from e

In pandoc's setup.py file (https://github.com/boisgera/pandoc/blob/master/setup.py), the section

try:
    import pip
    import setuptools
except ImportError:
    url = "http://pip.readthedocs.org"
    error = f"pip is not installed, refer to <{url}> for instructions."
    raise ImportError(error)

seems to be responsible for the fail. Somehow "pip" or "setuptools" is not available.

[dimbleby]

this needs to be solved at pandoc

boisgera/pandoc#49 seems to say that it has come up before, but the maintainer hasn't gotten round to resolving it yet.

[neersighted]

See #6407 for a similar case, as well as some workarounds that you can perform as the end user.

[github-actions]

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