Add pipenv support for build command

[sthulb]

It would be cool if SAM CLI could understand Python projects that use pipenv. Right now, sam build only supports dependencies that are specified in a requirements.txt.

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SAM Version: 0.8.0

[sriram-mv]

This could be a new workflow in https://github.com/awslabs/aws-lambda-builders. The current worflow is a python_pip workflow. this could be a python_pipenv workflow.

[sthulb]

I’ll see if I have capacity to do this next week.

[jblakeney]

:+1:

[jrupp]

Any movement on this?

[solarmosaic-kflorence]

FWIW using pipenv with PackageType: Image works fine (you can utilize it in your Dockerfile) with sam build. I seem to be having some issues getting that to work with sam local invoke, though (can't seem to find the dependencies even though they exist in my image).

EDIT: ah, this is because of the lambda entrypoint for the public.ecr.aws/lambda/python:3.8 image... it doesn't seem to be running the python commands in the same virtual environment that pipenv is using, and I can't use pipenv run since the entrypoint requires the handler to be the first function argument... I guess I can use pipenv install --system for now, even though it is discouraged.

[sriram-mv]

I'm going to go ahead and close this in favor of using a makefile based builder if one wants additional flexibility.

[matteocontrini]

@sriram-mv is there a chance to have this mentioned in the documentation, perhaps with an example?