Poetry ignores extras in dev-dependencies

[arxanas]

• I am on the latest Poetry version.

  • Yes, Poetry 0.12.10

• I have searched the issues of this repo and believe that this is not a duplicate.

  • I believe this is similar to dev-dependencies that are also extras #129 but not related. That one involves installing a package with different extras depending on the mode. This involves installing extras that only exist for dev-dependencies.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

  • No exception occurs.

• OS: macOS 10.13.16 build 17G65

• Poetry version: 0.12.10

• Link of a Gist with the contents of your pyproject.toml file: same as below, see https://gist.github.com/arxanas/b18be992384c105b0163691c63549159

Issue

Expected behavior: having optional packages in dev-dependencies allows them to be installed with poetry install --extras.
Actual behavior: having optional packages in dev-dependencies does nothing when trying to invoke poetry install --extras.

I want to have extras that are installable as dev-dependencies. In particular, I would like to make it possible install the fuzzing system for my project. However, it depends on Cython, which is heavyweight, and not something I would like to be installed by default when setting up the development environment.

Therefore I created a pyproject.toml like this, with the optional dependencies cython and python-afl, and the fuzz extra that would install both:

[tool.poetry]
name = "poetrytest"
version = "0.1.0"
description = ""
authors = ["Waleed Khan <me@waleedkhan.name>"]

[tool.poetry.dependencies]
python = "^2.7"

[tool.poetry.dev-dependencies]
pytest = "^3.0"
python-afl = {version = "^0.7.1",optional = true}
cython = {version = "^0.29.2",optional = true}

[tool.poetry.extras]
fuzz = ["cython", "python-afl"]

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

But when I try to install the fuzz extra, no packages are installed:

$ poetry install --extras fuzz
Installing dependencies from lock file

Nothing to install or update

  - Installing poetrytest (0.1.0)

If I move the optional dependencies to dependencies instead of dev-dependencies like this:

[tool.poetry]
name = "poetrytest"
version = "0.1.0"
description = ""
authors = ["Waleed Khan <me@waleedkhan.name>"]

[tool.poetry.dependencies]
python = "^2.7"
python-afl = {version = "^0.7.1",optional = true}
cython = {version = "^0.29.2",optional = true}

[tool.poetry.dev-dependencies]
pytest = "^3.0"

[tool.poetry.extras]
fuzz = ["cython", "python-afl"]

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

Then it works:

$ poetry install --extras fuzz
Installing dependencies from lock file


Package operations: 2 installs, 0 updates, 0 removals

  - Installing cython (0.29.2)
  - Installing python-afl (0.7.1)
  - Installing poetrytest (0.1.0)

But this is a problem because my actual project does not have these dependencies, even as extras.

[kepler]

According to @sdispater, this is by design: #606 (comment). However, I have the same question as the subsequent comment there.

[rmorshea]

@sdispater should there be an extra section for [tool.poetry.dev-extras]?

A common use case for having dev-extras is bifurcated requirements for local development vs remote CI/CD pipelines. Given how slow dependency resolution is, being able to reduce the number of packages you install in your CI/CD pipeline can shave a lot of time off each build.

@nickpresta are you open to making a PR with this new section?

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.