Adding Python packages to a Docker image

[Charlie White]

Apologies for this is a somewhat duplicate post.  I thought that a better subject may get it the visibility that the other didn't.

With that being said, I have an existing Docker image that I want to simply add some Python packages to.  I have gone down

the path of using the Python rules and the pip_import described in it.  That exposes the packages I need to the BUILD, but it

does not put the packages into the image.  

When I did this with Docker and Dockerfile, I simply ran pip install command.  I understand that this is not something supported by

Bazel, and the reasons for not doing it.  There has to be a way to do this that I am simply not finding.

Thanks,

Charlie

[Evan Jones]

If you are using the pip_import rules, be warned that they are somewhat incomplete and have some parts that don't work correctly. That said, the following is supposed to work:

* Use pip_import to make the pip packages available to bazel

* Write a py_binary target that depends on those pip packages.

* Use rules_docker to package this py_binary into a Docker image: https://github.com/bazelbuild/rules_docker

There are bugs in all these tools, so this may need a bit of hacking to get it to work, but this is supposed to work. Hope that helps,

Evan

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