New SkyFunction: PathCasingLookupFunction

The new PathCasingLookupFunction is a SkyFunction
that can validate the casing of a path.

On case-insensitive filesystems if "foo/BUILD"
exists then "FOO/BUILD" also exists (because they
mean the same file), but this should not imply
that the "//foo" and "//FOO" packages both exist.

The new SkyFunction can validate whether
"FOO/BUILD" is the correct casing. The casing is
correct if the file's name in its parent
directory's listing is exactly the same
(case-sensitively) as the expected name.

In a later PR we can change the
PackageLookupFunction to deny loading if the path
is not correctly cased.

Motivation: https://github.com/bazelbuild/bazel/issues/8799

Change-Id: Ibb2a5f4f6c6041bdfc537b33d0c6fc55e568b998

Closes #10362.

Change-Id: Ie25b9b202a1aef3b2594064b4842fc0f2fb2776b
PiperOrigin-RevId: 283939452
6 files changed
tree: 1555e57b28809b854e735b997c34cd6bd09d3046
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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