Properly account for symlinks and root symlinks in repo mapping manifest

A runfiles symlink entry `path/to/pkg/file -> path/to/artifact` is implicitly prefixed with the workspace name and should thus result in repo mappings to the main repository being added to the repo mapping manifest, not mappings for the owner of the artifact.

A runfiles root symlink entry `first_segment/path/to/pkg/file -> path/to/artifact` should result result in repo mappings to the repository with canonical name equal to the first segment being added to the repo mapping manifest, if such a repository exists.

Along the way clarifies in the documentation of `ctx.runfiles(symlinks = ...)` that the workspace name will be prefixed implicitly.

Closes #18381.

PiperOrigin-RevId: 541934743
Change-Id: I2931772c3b337d76e65fd81e4a6b783ed80ac05b
12 files changed
tree: 6ef1e40d215edd06ffc3c61558bbaef809167e66
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .bazelversion
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. BUILD
  15. CHANGELOG.md
  16. CODE_OF_CONDUCT.md
  17. CODEOWNERS
  18. combine_distfiles.py
  19. combine_distfiles_to_tar.sh
  20. compile.sh
  21. CONTRIBUTING.md
  22. CONTRIBUTORS
  23. distdir.bzl
  24. distdir_deps.bzl
  25. extensions.bzl
  26. LICENSE
  27. maven_install.json
  28. MODULE.bazel
  29. README.md
  30. repositories.bzl
  31. SECURITY.md
  32. WORKSPACE
  33. WORKSPACE.bzlmod
README.md

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