Can't install detectron2

• 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).

• OS version and name: Arch Linux
• Poetry version: 1.0.5
• Contents of your pyproject.toml file:

[tool.poetry]
name = "a"
version = "0.1.0"
description = ""
authors = ["a"]

[tool.poetry.dependencies]
python = "^3.6"
detectron2 = { git = "https://github.com/facebookresearch/detectron2.git" }

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

Issue

Poetry can’t figure out the version of detectron2. I’ve tried to debug this myself but the error messages don’t tell me anything useful:

$ /tmp/poetry/bin/poetry install -vvv

Creating virtualenv a-1_qs6r2x-py3.8 in /home/x/.cache/pypoetry/virtualenvs
Using virtualenv: /home/x/.cache/pypoetry/virtualenvs/a-1_qs6r2x-py3.8
Updating dependencies
Resolving dependencies...
   1: fact: a is 0.1.0
   1: derived: a
   1: fact: a depends on detectron2 (*)
   1: selecting a (0.1.0)
   1: derived: detectron2 (*)
   1: Version solving took 3.842 seconds.
   1: Tried 1 solutions.

[RuntimeError]
Unable to retrieve the package version for /tmp/pypoetry-git-detectron2683igqav

Traceback (most recent call last):
  File "/tmp/poetry/lib/poetry/_vendor/py3.8/clikit/console_application.py", line 131, in run
    status_code = command.handle(parsed_args, io)
  File "/tmp/poetry/lib/poetry/_vendor/py3.8/clikit/api/command/command.py", line 120, in handle
    status_code = self._do_handle(args, io)
  File "/tmp/poetry/lib/poetry/_vendor/py3.8/clikit/api/command/command.py", line 171, in _do_handle
    return getattr(handler, handler_method)(args, io, self)
  File "/tmp/poetry/lib/poetry/_vendor/py3.8/cleo/commands/command.py", line 92, in wrap_handle
    return self.handle()
  File "/tmp/poetry/lib/poetry/console/commands/install.py", line 63, in handle
    return_code = installer.run()
  File "/tmp/poetry/lib/poetry/installation/installer.py", line 74, in run
    self._do_install(local_repo)
  File "/tmp/poetry/lib/poetry/installation/installer.py", line 161, in _do_install
    ops = solver.solve(use_latest=self._whitelist)
  File "/tmp/poetry/lib/poetry/puzzle/solver.py", line 36, in solve
    packages, depths = self._solve(use_latest=use_latest)
  File "/tmp/poetry/lib/poetry/puzzle/solver.py", line 180, in _solve
    result = resolve_version(
  File "/tmp/poetry/lib/poetry/mixology/__init__.py", line 7, in resolve_version
    return solver.solve()
  File "/tmp/poetry/lib/poetry/mixology/version_solver.py", line 80, in solve
    next = self._choose_package_version()
  File "/tmp/poetry/lib/poetry/mixology/version_solver.py", line 355, in _choose_package_version
    packages = self._provider.search_for(dependency)
  File "/tmp/poetry/lib/poetry/puzzle/provider.py", line 130, in search_for
    packages = self.search_for_vcs(dependency)
  File "/tmp/poetry/lib/poetry/puzzle/provider.py", line 167, in search_for_vcs
    package = self.get_package_from_vcs(
  File "/tmp/poetry/lib/poetry/puzzle/provider.py", line 204, in get_package_from_vcs
    package = cls.get_package_from_directory(tmp_dir, name=name)
  File "/tmp/poetry/lib/poetry/puzzle/provider.py", line 343, in get_package_from_directory
    raise RuntimeError(

Is poetry unable to get dynamically generated versions?

[abn]

@malcolmgreaves for completeness this is what you need to keep legacy build.

[build-system]
requires = ["setuptools", "wheel", "torch"]
build-backend = "setuptools.build_meta:__legacy__"

[iamlucaswolf]

@malcolmgreaves I just tried your workaround to integrate detectron2 with an existing project but still get errors… 😕

My pyproject.toml looks like this:

[tool.poetry.dependencies]
...
detectron2 = { git = "https://github.com/facebookresearch/detectron2.git"}

[build-system]
requires = ["setuptols", "wheel", "torch"]
build-backend = "setuptools.build_meta:__legacy__"

However, when I run poetry install, I get:

PackageInfoError

  Unable to determine package info for path: /tmp/pypoetry-git-detectron20h25u89n
  
  Fallback egg_info generation failed.
  
  Command ['/tmp/tmpi8lubyub/.venv/bin/python', 'setup.py', 'egg_info'] errored with the following return code 1, and output: 
  Traceback (most recent call last):
    File "/tmp/pypoetry-git-detectron20h25u89n/setup.py", line 10, in <module>
      import torch
  ModuleNotFoundError: No module named 'torch'

  at ~/.poetry/lib/poetry/inspection/info.py:502 in _pep517_metadata
      498│                 try:
      499│                     venv.run("python", "setup.py", "egg_info")
      500│                     return cls.from_metadata(path)
      501│                 except EnvCommandError as fbe:
    → 502│                     raise PackageInfoError(
      503│                         path, "Fallback egg_info generation failed.", fbe
      504│                     )
      505│                 finally:
      506│                     os.chdir(cwd.as_posix())

Any idea why that might be the case?