Poetry self update --preview installs to system python

[mindlace]

• 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: OSX Big Sur 11.6
• Poetry version: 1.1.11 & 1.2.0a2
• Link of a Gist with the contents of your pyproject.toml file: No pyproject required

Issue

When updating poetry, it installs to the currently active python rather than poetry's "self contained" venv, leaving the isolated poetry at the prior version.

Steps to reproduce:

1. python -m pip list -> shows no poetry package
2. curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python - -> installs 1.11.1
3. python -m pip list -> unchanged
4. poetry self upgrade --preview -> upgrades
5. python -m pip list -> includes all deps for poetry 1.20.0a2

Full shell transcript here

Expected behavior:

Poetry updates itself inside its virtualenv, and does not install anything in the local/current python env

[rowanseymour]

I think we're seeing the same problem with updating from 1.1.11 to 1.1.12. It's trying to update system python and blowing up for a lack of permissions.

:~$ which poetry
/home/foo/.local/bin/poetry
:~$ poetry self update
Updating Poetry to 1.1.12

Updating dependencies
Resolving dependencies... (0.7s)

Package operations: 1 install, 19 updates, 0 removals

  - Updating zipp (3.1.0 -> 3.6.0)
  - Updating certifi (2018.1.18 /usr/lib/python3/dist-packages -> 2021.10.8)

  EnvCommandError

  Command ['pip', 'uninstall', 'certifi', '-y'] errored with the following return code 2, and output:
  Found existing installation: certifi 2018.1.18
  Uninstalling certifi-2018.1.18:
  ERROR: Exception:
  Traceback (most recent call last):
    File "/usr/lib/python3.6/shutil.py", line 550, in move
      os.rename(src, real_dst)
  PermissionError: [Errno 13] Permission denied: '/usr/lib/python3/dist-packages/certifi' -> '/tmp/pip-uninstall-viqko_d0'

Maybe I'm misunderstanding how it works but I would expect it to only make changes in /home/foo/.local/lib/python3.6/ and not be touching /usr/lib/python3/

[cpmsmith]

I'm seeing this as well—somehow, I've ended up with a poetry file in /opt/homebrew/bin (macOS, arm64) and try as I might, I can't get the uninstaller script to see it. The timestamp on the file is just after I ran poetry self update --preview from 1.1.13 to 1.2.0b1 [edit: as finswimmer's comment implies, I was in fact upgrading from 1.1.12, not 1.1.13, hence the problem]

[finswimmer]

Hello,

this is fixed since poetry 1.1.13 by #5048.

fin swimmer

[github-actions]

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