Docker-first Python development

Jeremy Moore on April 12, 2019

I've always been a bit annoyed at how difficult it can be to avoid shipping test code and dependencies with Python applications. A typical build... [Read Full]
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This is pretty awesome. I wonder if you could copy from the builder stage to the tests_builder stage by modifying tests_builder to copy from the builder stage like so:

FROM test_deps as tests_builder

COPY --from=builder ./src ./src

COPY tests ./tests

Disclaimer: I'm not 100% sure this would fit your use case, but it's worth a shot. If you try this out, let us know how it worked for you.

 

You can definitely do this, but Docker still has to create a new layer for it. Copying it from the builder stage could definitely help if building the src dir is more complicated than copying over a single directory.

 

That's true, I didn't think of the extra layer Docker would add in the process.

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