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Support different backends #1487

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Support different backends #1487

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dukecat0
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@dukecat0 dukecat0 commented Jul 22, 2024

  • I have added a news fragment under changelog.d/ (if the patch affects the end users)

Summary of changes

Closes #1392
This allows users to choose from different backends and also speeds up the installation process.

Screenshot 2024-07-21 at 11 11 55 AM

Test plan

Tested by running

pipx install --backend uv --install uv black
pipx run --backend uv --installer uv black

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@chrysle chrysle left a comment

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Thank you very much for working on this feature! Some initial thoughts.

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@dukecat0 dukecat0 marked this pull request as ready for review July 23, 2024 06:56
@dukecat0 dukecat0 marked this pull request as draft July 23, 2024 06:59
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@dukecat0 dukecat0 changed the title [WIP] Support different backends Support different backends Aug 24, 2024
@dukecat0 dukecat0 marked this pull request as ready for review August 24, 2024 13:29
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chrysle commented Sep 8, 2024

Per #1539 (comment), we should consider adding the --no-seed option to the virtualenv (not sure concerning the uv mechanism) backend invocation.

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dukecat0 commented Sep 8, 2024

It seems like uv doesn't have this issue since it doesn't carry extra seed packages by default:

activate      activate.fish  activate_this.py  python
activate.bat  activate.nu    deactivate.bat    python3
activate.csh  activate.ps1   pydoc.bat	       python3.9

Comment on lines +202 to 204
shared_libs.create(verbose=self.verbose, pip_args=pip_args)
if not override_shared and (self.backend != "uv" or self.installer != "uv"):
pipx_pth = get_site_packages(self.python_path) / PIPX_SHARED_PTH
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Should the shared environment still be injected/exist after this or should it only be used (and thus maybe renamed) as the environment holding pip and allowing "{shared_libs.python_path}" -m pip --python "{self.python_path}" being used as an installer (rather than "{self.python_path}" -m pip in _run_pip)

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Using --python option sounds reasonable, but would there be any scenarios where users would prefer to keep the .pth file?

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The only thing that comes to mind would be if they were directly running python in an app venv to run pip instead of using pipx runpip.

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Support different backends for pipx?
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