Bazel client: mock out read/write calls

Make blaze::ReadFileDescriptor(int fd, ...) and
blaze::WriteFile(int fd, ...) platform-independent
by mocking out the read(2) and write(2) calls.

Also rename ReadFileDescriptor to ReadFrom and
introduce a new WriteTo method that encapsulates
WriteFile's prior logic.

In particular these functions now take a
read_func/write_func function argument instead of
a file descriptor, so the read(2)/write(2) calls
can be mocked out.

This allows us to use these functions on Windows
too, where read(2)/write(2) are not implemented,
and we can inject a different
read_func/write_func.

See https://github.com/bazelbuild/bazel/issues/2107

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MOS_MIGRATED_REVID=140195973
4 files changed
tree: 06344c6c393bc21b44070cab37ece2f731e49ff9
  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.txt
  18. README.md
  19. WORKSPACE
README.md

Bazel (Beta)

{Fast, Correct} - Choose two

Bazel is a build tool that builds code quickly and reliably. It is used to build the majority of Google‘s software, and thus it has been designed to handle build problems present in Google’s development environment, including:

  • A massive, shared code repository, in which all software is built from source. Bazel has been built for speed, using both caching and parallelism to achieve this. Bazel is critical to Google's ability to continue to scale its software development practices as the company grows.

  • An emphasis on automated testing and releases. Bazel has been built for correctness and reproducibility, meaning that a build performed on a continuous build machine or in a release pipeline will generate bitwise-identical outputs to those generated on a developer's machine.

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