Chunker: Always seek on the uncompressed stream.

The `WriteRequest.write_offset` field has bizarre semantics during compressed uploads as documented in the remote API protos: https://github.com/bazelbuild/remote-apis/blob/3b4b6402103539d66fcdd1a4d945f660742665ca/build/bazel/remote/execution/v2/remote_execution.proto#L241-L248 In particular, the write offset of the first `WriteRequest` refers to the offset in the uncompressed source.

This change ensures we always seek the uncompressed stream to the correct offset when starting an upload call. The old code could fail to resume compressed uploads under some conditions. The `progressiveCompressedUploadShouldWork` test purported to exercise this situation. The test, however, contained the same logic error as the code under test.

Closes #15669.

PiperOrigin-RevId: 455083727
Change-Id: Ie22dacf31f15644c7a83f49776e7a633d8bb4bca
2 files changed
tree: 05f60428de74c4a056e056242b9040a1ad11999e
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .gitattributes
  11. .gitignore
  12. AUTHORS
  13. BUILD
  14. CHANGELOG.md
  15. CODE_OF_CONDUCT.md
  16. CODEBASE.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. LICENSE
  26. MODULE.bazel
  27. README.md
  28. SECURITY.md
  29. WORKSPACE
  30. WORKSPACE.bzlmod
README.md

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