issue-link js-issue-link" data-error-text="Failed to load title" data-id="2494793412" data-permission-text="Title is private" data-url="https://github.com/heroku/buildpacks-python/issues/254" data-hovercard-type="issue" data-hovercard-url="/heroku/buildpacks-python/issues/254/hovercard" href="https://github.com/heroku/buildpacks-python/issues/254">#254, pip is now installed into its own layer rather than into the system site-packages directory inside the Python layer. This means its now possible to exclude pip from the final app image, by making the pip layer be a build-only layer. Excluding pip from the final app image: - Prevents several classes of user error/confusion/bad app design patterns seen in support tickets (see #255 for more details). - Reduces app image supply chain surface area. - Reduces app image size by 13 MB and layer count by 1, meaning less to have to push to the remote registry. - Matches the approach used for Poetry, where we don't make Poetry available at run-time either. Users that need pip at run-time for a temporary debugging task can run `python -m ensurepip --default-pip` in the container at run-time to make it available again (this command doesn't even have to download anything - it uses the pip bundled with Python). Or if pip is an actual run-time dependency of the app, then the app can add `pip` to its `requirements.txt` (which much more clearly conveys the requirements of the app, and also allows the app to pick what pip version it needs at run-time). Should we find that pip's absence causes confusion in the future, we could always add a wrapper/shim `pip` script in the app image which does something like: ``` echo "pip isn't installed at run-time, if you need it temporarily run 'python -m ensurepip --default-pip' to install it" exit 1 ``` ...to improve discoverability. We'll also document pip (and Poetry) being available at build-time only in the docs that will be added by #11. Closes #255. GUS-W-16697386.

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Commits

Commits on Sep 9, 2024

Stop including pip in the final app image