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by throwaway894345
2331 days ago
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To be clear, the only file in question is requirements.txt; Docker has no idea what files `pip install ...` is pulling and doesn't factor them into any kind of cache check. Beyond that, I didn't realize that timestamps were factored into the hash, or at least if they were, I would expect git or similar to set them "correctly" such that Docker does the right thing (I still think Docker's build tooling is insane, but I'm surprised that it breaks in this case)? |
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https://docs.docker.com/develop/develop-images/dockerfile_be...
> For the ADD and COPY instructions, the contents of the file(s) in the image are examined and a checksum is calculated for each file. The last-modified and last-accessed times of the file(s) are not considered in these checksums. During the cache lookup, the checksum is compared against the checksum in the existing images. If anything has changed in the file(s), such as the contents and metadata, then the cache is invalidated.