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Release 9.0.1 (2026-03-10)
General
C++ / Objective-C
CLI
- Add a new optional param to fail() to allow pretty-printing user errors without a stack trace. (#28817)
Configurability
- Fix NPE caused by --repo_env with no value set (#28640)
- Fix visibility for implicit deps of parent rules (#28687)
- Refactor flag aliases to be passed around as labels (#28835)
- rules_python flag alias fixes (#28854)
- Support external repository labels in package_group (#28895)
- Emit helpful error when using removed providers (#28360)
Core
- Prevent a Blaze crash when an aspect uses a test's TestRunner action. (#28756)
External Deps
- Revert "Upgrade Apache Commons Compress from 1.26.1 to 1.28.0" (#28550)
- Fix disk cache failures on concurrent read-write access on Windows (#28552)
- Error on single_version_override patch with wrong patch_strip (#28622)
- Force `rctx.{download_and,}extract` to create user-readable files (#28649)
- Fix `StarlarkBaseExternalContext#checkInOutputDirectory` (#28677)
- Update and minimize the JDK for Windows arm64 builds (#28714)
- Only use workspace facts for validation with --lockfile_mode=error (#28767)
- Replant symlinks before caching repos (#28785)
OSS
- Support proto_library targets in @bazel_tools//src/main/protobuf (#28502)
Performance
- Fix overflow in network metrics counters (#28864)
Python
- Add deprecation warning to --build_python_zip (#28586)
Remote Execution
- Fix a deadlock in `RemotePathChecker` when using a disk cache (#28465)
Acknowledgements:
This release contains contributions from many people at Google, as well as Fabian Meumertzheim, Joseph Gette, Keith Smiley, Ted Kaplan, and Will Stranton.
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