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Pants

I don't quite remember if Pants can be told to cache results of the `run` goal? :thread:

Say I have a deterministic Python script that is guaranteed to produce bit by bit identical output given the same input, it has no side effects etc, e.g. it reads a file from disk and saves a new file on disk. If I have run `run` on an input file and then `run` it again, the very same command (with input data unchanged), it would be nice to fetch the output file from the cache. If that helps, I can make both input and output to reside in the build workspace.

I don't want to write an own codegen which would help with that. :slightly_smiling_face: and I'd love to avoid adding an own little cache with something like <https://joblib.readthedocs.io/>.

although you want the output written to disk

We hack around the lack of <https://github.com/pantsbuild/pants/discussions/18235|https://github.com/pantsbuild/pants/discussions/18235> by using adhoc_tool to run the thing, and then have a `run_shell_command` that just copies the file. Ie the heavy work (running the script) is cached, but the writing to disk isn’t.

oh that's brilliant, Huon, I'll explore this!