info: fix metadata build error propagation

[abn]

This change fixes a regression that caused the swallowing of PEP517 build errors when isolated builds fail during metadata build.

Borrowing from another issue, you can use the following pyproject.toml to reproduce/test.

[tool.poetry]
name = "my-package"
version = "0.1.0"
description = ""
authors = ["My Name <my.name@example.com>"]
readme = "README.md"

[tool.poetry.dependencies]
python = "^3.10"
mmagic = {git = "/~https://github.com/open-mmlab/mmagic.git", rev = "0a560bb"}

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

Output w/ Poetry (1.8.4)

Updating dependencies
Resolving dependencies... (3.1s)

Unable to determine package info for path: /tmp/foo/.venv/src/mmagic

Command ['/tmp/tmp_xptxh3p/.venv/bin/python', '-I', '-W', 'ignore', '-c', "import build\nimport build.env\nimport pyproject_hooks\n\nsource = '/tmp/foo/.venv/src/mmagic'\ndest = '/tmp/tmp_xptxh3p/dist'\n\nwith build.env.DefaultIsolatedEnv() as env:\n    builder = build.ProjectBuilder.from_isolated_env(\n        env, source, runner=pyproject_hooks.quiet_subprocess_runner\n    )\n    env.install(builder.build_system_requires)\n    env.install(builder.get_requires_for_build('wheel'))\n    builder.metadata_path(dest)\n"] errored with the following return code 1

Error output:
Traceback (most recent call last):
  File "<string>", line 13, in <module>
    env.install(builder.get_requires_for_build('wheel'))
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/tmp/tmp_xptxh3p/.venv/lib/python3.13/site-packages/build/__init__.py", line 239, in get_requires_for_build
    with self._handle_backend(hook_name):
         ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/usr/lib64/python3.13/contextlib.py", line 162, in __exit__
    self.gen.throw(value)
    ~~~~~~~~~~~~~~^^^^^^^
  File "/tmp/tmp_xptxh3p/.venv/lib/python3.13/site-packages/build/__init__.py", line 360, in _handle_backend
    raise BuildBackendException(exception, f'Backend subprocess exited when trying to invoke {hook}') from None
build._exceptions.BuildBackendException: Backend subprocess exited when trying to invoke get_requires_for_build_wheel

Fallback egg_info generation failed.

Command ['/tmp/tmp_xptxh3p/.venv/bin/python', 'setup.py', 'egg_info'] errored with the following return code 1

Output:
Traceback (most recent call last):
  File "/tmp/foo/.venv/src/mmagic/setup.py", line 9, in <module>
    import torch
ModuleNotFoundError: No module named 'torch'

Output w/ Poetry (git@main)

Updating dependencies
Resolving dependencies... (0.4s)

Unable to determine package info for path: /tmp/foo/.venv/src/mmagic

Backend subprocess exited when trying to invoke get_requires_for_build_wheel

PEP517 build failed

Output w/ PR

Updating dependencies
Resolving dependencies... (6.7s)

Unable to determine package info for path: /root/.cache/pypoetry/virtualenvs/my-package-lWDpn5M1-py3.13/src/mmagic

PEP517 build of a dependency failed

Backend subprocess exited when trying to invoke get_requires_for_build_wheel

    | Command '['/tmp/tmp34u3w5e2/.venv/bin/python', '/usr/local/lib/python3.13/site-packages/pyproject_hooks/_in_process/_in_process.py', 'get_requires_for_build_wheel', '/tmp/tmp12kuqqsd']' returned non-zero exit status 1.
    | 
    | Traceback (most recent call last):
    |   File "/usr/local/lib/python3.13/site-packages/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
    |     main()
    |     ~~~~^^
    |   File "/usr/local/lib/python3.13/site-packages/pyproject_hooks/_in_process/_in_process.py", line 373, in main
    |     json_out["return_val"] = hook(**hook_input["kwargs"])
    |                              ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
    |   File "/usr/local/lib/python3.13/site-packages/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
    |     return hook(config_settings)
    |   File "/tmp/tmp34u3w5e2/.venv/lib/python3.13/site-packages/setuptools/build_meta.py", line 334, in get_requires_for_build_wheel
    |     return self._get_build_requires(config_settings, requirements=[])
    |            ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |   File "/tmp/tmp34u3w5e2/.venv/lib/python3.13/site-packages/setuptools/build_meta.py", line 304, in _get_build_requires
    |     self.run_setup()
    |     ~~~~~~~~~~~~~~^^
    |   File "/tmp/tmp34u3w5e2/.venv/lib/python3.13/site-packages/setuptools/build_meta.py", line 522, in run_setup
    |     super().run_setup(setup_script=setup_script)
    |     ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |   File "/tmp/tmp34u3w5e2/.venv/lib/python3.13/site-packages/setuptools/build_meta.py", line 320, in run_setup
    |     exec(code, locals())
    |     ~~~~^^^^^^^^^^^^^^^^
    |   File "<string>", line 9, in <module>
    | ModuleNotFoundError: No module named 'torch'

Note: This error originates from the build backend, and is likely not a problem with poetry but one of the following issues with /root/.cache/pypoetry/virtualenvs/my-package-lWDpn5M1-py3.13/src/mmagic

  - not supporting PEP 517 builds
  - not specifying PEP 517 build requirements correctly
  - the build requirements are incompatible with your operating system or Python versions
  - the build requirements are missing system dependencies (eg: compilers, libraries, headers).

You can verify this by running pip wheel --no-cache-dir --use-pep517 "/root/.cache/pypoetry/virtualenvs/my-package-lWDpn5M1-py3.13/src/mmagic".

You can test this pull request using the following command. You can swap podman with docker if you use that.

podman run --rm -it --entrypoint bash docker.io/python:3.13 <<EOF
set -xe
python -m pip install --root-user-action ignore  --disable-pip-version-check -q git+/~https://github.com/python-poetry/poetry.git@refs/pull/9870/head
install -d foobar
pushd foobar
cat > pyproject.toml <<TOML
[tool.poetry]
name = "my-package"
version = "0.1.0"
description = ""
authors = ["My Name <my.name@example.com>"]
readme = "README.md"

[tool.poetry.dependencies]
python = "^3.10"
mmagic = {git = "/~https://github.com/open-mmlab/mmagic.git", rev = "0a560bb"}

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"
TOML
poetry install
EOF

You can also preview the changes on asciinema.

[radoering]

Nice. Have you thought about adding the indentation of the inner error and/or the listing of possible reasons also at

poetry/src/poetry/installation/executor.py

Lines 316 to 322 in c70cbf4

	"<info>"
	"Note: This error originates from the build backend,"
	" and is likely not a problem with poetry"
	f" but with {pkg.pretty_name} ({pkg.full_pretty_version})"
	" not supporting PEP 517 builds. You can verify this by"
	f" running '{pip_command} \"{requirement}\"'."
	"</info>"

?

[abn]

Yeah. But figured I'll do that in a separate PR just to keep things clean here. I also wanted to see if we can unify that somehow. Once this is accepted I can work on that, ie. No one has objections to the formatting.

[abn]

@radoering @Secrus I have now also unified the changes for executor and info as well here.

[github-actions]

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