Bazel client: add blaze_util::IsDevNull

Add a method to test if a path is /dev/null (or
case-insensitive "NUL" on Windows), and use it in
blaze::MakeAbsolute.

In this commit:
- implement blaze_util::IsDevNull with POSIX and
  Windows semantics + add tests
- blaze::MakeAbsolute calls blaze::ConvertPath
  on its input to convert MSYS paths on Windows
- blaze_util::GetCwdW (thus GetCwd) always returns
  a lowercase path so that it is deterministic
- blaze_util::GetCurrentDrive returns lowercase
  letter to be consisent with blaze::ConvertPath,
  which also returns a lowercase path

Fixes https://github.com/bazelbuild/bazel/issues/3440

Change-Id: I3af5ba0a033d542fe64a676d67f27472298d1089
PiperOrigin-RevId: 163038503
8 files changed
tree: 5bd9963eb65bd139e7e159f713438555a6609b9d
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.sh
  13. compile.sh
  14. CONTRIBUTING.md
  15. CONTRIBUTORS
  16. ISSUE_TEMPLATE.md
  17. LICENSE
  18. README.md
  19. WORKSPACE
README.md

Bazel

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