• 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: 1.1.3

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/iksteen/bd2e570b8986f348e136038439d6be19

Issue

After installing a package with extras from a private repository and running poetry install again, the extra dependencies are uninstalled. For easy reproducibility I've created a private repository that's publicly accessible and contains a single package (iksteen-aaa).

• Start out with a fairly empty pyproject.toml: https://gist.github.com/iksteen/83a3d5b55a8274bfbb434d72676fea70
• Now add the iksteen-aaa package with the example extra:

$ poetry add iksteen-aaa -E example
Using version ^0.1.0 for iksteen-aaa

Updating dependencies
Resolving dependencies... (1.6s)

Writing lock file

Package operations: 9 installs, 0 updates, 0 removals

  • Installing pycparser (2.20)
  • Installing cffi (1.14.3)
  • Installing pyasn1 (0.4.8)
  • Installing six (1.15.0)
  • Installing cryptography (3.1.1)
  • Installing ecdsa (0.14.1)
  • Installing rsa (4.6)
  • Installing python-jose (3.2.0)
  • Installing iksteen-aaa (0.1.0)

• Run poetry install again and see the extra dependencies getting uninstalled:

$ poetry install
Installing dependencies from lock file

Package operations: 0 installs, 0 updates, 8 removals

  • Removing cffi (1.14.3)
  • Removing cryptography (3.1.1)
  • Removing ecdsa (0.14.1)
  • Removing pyasn1 (0.4.8)
  • Removing pycparser (2.20)
  • Removing python-jose (3.2.0)
  • Removing rsa (4.6)
  • Removing six (1.15.0)

When adding the package in a different way, f.e. by adding the wheel by its direct URL https://pypi.thegraveyard.org/api/package/iksteen-aaa/iksteen_aaa-0.1.0-py3-none-any.whl, the uninstalling of the extra dependencies does NOT occur.