Up-to-date packages are re-installed if virtualenvs.create is false #4254

• I am on the latest current master (22c3aad) 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: Ubuntu 20.04

• Poetry version: current master (22c3aad)

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/jstriebel/6e804c769e2075be390496e68474a36c

Issue

Packages that were already installed (by poetry itself) are re-installed if virtualenvs.create is false. This bug only appears on v1.2, it does not occur on the 1.1 branch or the latest v1.1 releases. I added a reproducible case via a Dockerfile in the linked gist.

When running docker build . on those files, this produces:

Step 12/14 : RUN poetry install
 ---> Running in 73dfd5dcf683
Skipping virtualenv creation, as specified in config file.
Installing dependencies from lock file

Package operations: 3 installs, 0 updates, 2 removals

  • Removing importlib-metadata (4.6.1)
  • Removing zipp (3.5.0)
  • Installing attrs (21.2.0)
  • Installing pyrsistent (0.18.0)
  • Installing jsonschema (3.2.0)
Removing intermediate container 73dfd5dcf683
 ---> 04e982ae2043
Step 13/14 : RUN echo SECOND INSTALL!!!
 ---> Running in 7ec46c74fa47
SECOND INSTALL!!!
Removing intermediate container 7ec46c74fa47
 ---> eff9efcdee5e
Step 14/14 : RUN poetry install
 ---> Running in a877dc9c4864
Skipping virtualenv creation, as specified in config file.
Installing dependencies from lock file

Package operations: 3 installs, 0 updates, 0 removals

  • Installing attrs (21.2.0)
  • Installing pyrsistent (0.18.0)
  • Installing jsonschema (3.2.0)
Removing intermediate container a877dc9c4864

The packages are not installed twice if virtualenvs.create is true (tested by commenting out the COPY poetry.toml / line).

Possibly related previous issues: #1711, #1882 (solved in previous releases, but re-introduced in v1.2)

Given that this was broken multiple times in different ways now, would it be possible to add some tests for this case as well? I'd be happy to help here, but have no experience with the poetry code-base.