• I am on the latest Poetry version. (1.0.0b9)

• 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: Debian buster

• Poetry version: 1.0.0b9

Issue

Thanks for the great work! With current releases we experience that already up-to-date packages (with the correct versions) are reinstalled by poetry, as it tries to update them. This seems to happen because we don't use poetry's virtualenv feature (using poetry config virtualenvs.create false).

Here's a part of the poetry install output, when running it the second time:

  - Updating humanfriendly (4.18 /usr/local/lib/python3.6/dist-packages -> 4.18)
  - Updating imageio (2.6.1 /usr/local/lib/python3.6/dist-packages -> 2.6.1)
  - Updating importlab (0.5.1 /usr/local/lib/python3.6/dist-packages -> 0.5.1)

It seems that dist-packages can never match the version, so poetry tries to upgrade them, even when the version actually matches.

Output of poetry debug info:

Poetry
Version: 1.0.0b9
Python:  3.6.8

Virtualenv
Python:         3.6.8
Implementation: CPython
Path:           NA

System
Platform: linux
OS:       posix
Python:   /usr