sphinxdocs .serve does not work when --symlink_prefix is set

[schenker]

🐞 bug report

Affected Rule

https://github.com/bazel-contrib/rules_python/blob/7c6b109db7e7fdece78561dc62ef8f7c92185734/sphinxdocs/private/sphinx.bzl#L187-L196

Description

When using sphinx_docs to define my_docs, running bazel run //my_docs.serve outputs

Serving directory: /home/me/.../my-project/bazel-out/k8-dbg/bin/my_docs/_build/html

This works, until I use a different symlink prefix (https://bazel.build/reference/command-line-reference#build-flag--symlink_prefix). With a different symlink prefix, the served directory bazel-out does not exist which leads to a 404 error.

🌍 Your Environment

Operating System:

  
      Ubuntu 24.04.3 LTS
  

Output of bazel version:

  
    bazel 8.4.2
  

Rules_python version:

  
    1.6.3