Persist pip-source layer; add layer path to PIP_FIND_LINKS env var #451
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Summary
The changes in this PR ensure that we persist the extracted
pip
source code in a layer which is available to downstream buildpacks at build-time instead of an ephemeral directory so that invocations ofpip install
may reliably access the packages bundled therein (setuptools, wheel, etc.). Setting thePIP_FIND_LINKS
environment variable ensures that thepip-install
buildpack can see the location of thepip
source without explicit coupling.Use Cases
Resolves #421
Checklist