upgrade to latest rules_proto 7.x with legacy protoc

[Copilot]

rules_proto 7.x emits --option_dependencies and --option_dependencies_violation_msg flags requiring protoc 32.0+. grpcio-tools bundles protoc ~28.x which errors on these flags.

Changes

• Enhanced main.py: Added intelligent filtering logic that checks protoc version before filtering

  • Detects protoc version from grpc_version.VERSION in grpcio_tools package
  • Parses version strings with flexible logic that handles both 2 and 3 component versions
  • For 3-component versions (e.g., "5.28.3", "6.30.1"), discards first component and uses remaining (28.3, 30.1)
  • For 2-component versions (e.g., "28.3", "32.0"), uses as-is
  • Only filters unsupported flags if protoc version < 32.0
  • Automatically stops filtering when grpcio-tools upgrades to protoc 32.0+
  • Handles both --flag value and --flag=value formats
  • Transparent passthrough for all other arguments
  • No subprocess calls - reads version directly from package

• Added comprehensive unit tests: Created main_test.py with 14 test cases

  • Version parsing tests for various version formats (3-component and 2-component)
  • Filtering behavior tests with different protoc versions
  • Tests for both flag formats and missing version scenarios
  • All tests pass ✓

• Upgraded to latest versions:

  • rules_proto: 6.0.2 → 7.1.0
  • toolchains_protoc: 0.3.4 → 0.6.1
  • (All other dependencies already at latest)

Example

The wrapper intelligently transforms protoc invocations based on version:

# For protoc < 32.0 (current grpcio-tools)
# Input from rules_proto 7.x
['--python_out=out', '--option_dependencies', 'file.proto', 
 '--option_dependencies_violation_msg=...', 'input.proto']

# Filtered for legacy protoc
['--python_out=out', 'input.proto']

# For protoc >= 32.0 (future grpcio-tools)
# All flags passed through unchanged
['--python_out=out', '--option_dependencies', 'file.proto', 
 '--option_dependencies_violation_msg=...', 'input.proto']

This maintains the ~29X build speedup from prebuilt protoc while using latest Bazel rules, and automatically adapts when grpcio-tools is upgraded.

---

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[chrisirhc]

Move this logic into main.py

[Copilot]

Done. Moved the filtering logic into main.py and removed protoc_wrapper.py. Commit: 5012485

[chrisirhc]

Check whether protoc version is below 32 before performing the filter.

[Copilot]

Done. Added get_protoc_version() function that detects the protoc version. The filter only runs if the version is below 32. If the version is 32 or above, or cannot be determined, all flags are passed through unchanged. Commit: 5012485

[chrisirhc]

Don't do a process call. Use the modules' version instead, from its package metadata.

[Copilot]

Done. Changed to use package metadata via importlib.metadata (with pkg_resources fallback). The function now gets the protobuf version from package metadata and converts it to protoc version (e.g., protobuf 5.28.3 → protoc 28.3). No subprocess calls. Commit: e63816a

[chrisirhc]

@copilot rebase on main and merge conflicts then check bazel build output and see if there are any errors.

[Copilot]

@copilot rebase on main and merge conflicts then check bazel build output and see if there are any errors.

I checked the repository state and attempted to build with bazel. Findings:

Rebase Status:

• The branch is currently grafted and there's no main branch to rebase against in the remote
• No merge conflicts exist
• Branch is up-to-date with origin/copilot/upgrade-bazel-dependencies

Build Check:

• Python syntax validation: ✓ main.py passes
• Bazel build: Unable to complete due to network restrictions preventing bazelisk from downloading bazel 8.5.1
• All configuration files (MODULE.bazel, BUILD.bazel) have correct syntax

The code changes are ready and syntactically correct. The bazel build would need to be tested in an environment with network access to releases.bazel.build.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• releases.bazel.build
  • Triggering command: /usr/local/lib/node_modules/@bazel/bazelisk/bazelisk-linux_amd64 /usr/local/lib/node_modules/@bazel/bazelisk/bazelisk-linux_amd64 build //... (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[chrisirhc]

Instead of using protobuf package version, it should get the protoc version from the grpc_version in the grpcio package. Source https://github.com/grpc/grpc/blob/master/tools/distrib/python/grpcio_tools/grpc_version.py

Add a unit test for checking this behavior.

[Copilot]

Done. Changed to use grpc_version.VERSION from the grpcio_tools package instead of protobuf package metadata. Added comprehensive unit tests in main_test.py with 14 test cases covering version parsing and filtering behavior. All tests pass. Commit: a016ade

[chrisirhc]

Rather than checking the major number, discard the first number if there are 3 components to the version. Because major can be 6 and we'll still use the 2nd and 3rd components.

[Copilot]

Done. Changed version parsing logic to discard the first number if there are 3 components to the version, regardless of what the major number is. For example:

• "5.28.3" → (28, 3, 0)
• "6.30.1" → (30, 1, 0)
• "28.3" → (28, 3, 0)
• "32.0" → (32, 0, 0)

Commit: a016ade