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Fish build not reproducible due to non-deterministic search index

Description:

Currently https://reproducible.archlinux.org/ lists as bad because it can't reproduce the search index in the documentation, because Sphinx builds non-deterministic search indexes when parallelization is enabled for documentation builds.

That's being worked on upstream as far as I can see (e.g. https://github.com/sphinx-doc/sphinx/issues/11887), but meanwhile a workaround would be to turn off parallelization for the doc build. Unfortunately, fish upstream hardcodes -j auto in its sphinx-build invocation, but that's presumably easy to patch.

I could make a merge request with the corresponding change, but I figured I'd ask first whether patching upstream to make a build reproducible would be acceptable and desirable for Arch Linux.

Additional info:

  • package version(s): 3.7.0-1
  • config and/or log files:
  • link to upstream bug report, if any:

Steps to reproduce:

n/a

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