[Bug]: Examples fail to build with v29.0-rc3 or LATEST (when LATEST is a release candidate)

[aaylward]

What happened?

When I try to use one of the v29 rc releases, the repository fetch fails due to a small naming inconsistency between version names like v29.0-rc3 and release artifact names like protoc-29.0-rc-3-osx-aarch_64.zip (note the dash between rc and 3 in the artifact name). prebuilt_protoc_toolchain doesn't know about this detail in release candidate naming, so I see the following build failure:

➜  examples git:(main) ✗ bazel build //...
INFO: Repository toolchains_protoc~~protoc~toolchains_protoc_hub.osx_aarch_64 instantiated at:
  <builtin>: in <toplevel>
Repository rule prebuilt_protoc_repo defined at:
  /private/var/tmp/_bazel_andy/4cc4769677fc1e3bb8be3c9c6bb2b2f6/external/toolchains_protoc~/protoc/private/prebuilt_protoc_toolchain.bzl:70:39: in <toplevel>
ERROR: An error occurred during the fetch of repository 'toolchains_protoc~~protoc~toolchains_protoc_hub.osx_aarch_64':
   Traceback (most recent call last):
	File "/private/var/tmp/_bazel_andy/4cc4769677fc1e3bb8be3c9c6bb2b2f6/external/toolchains_protoc~/protoc/private/prebuilt_protoc_toolchain.bzl", line 41, column 53, in _prebuilt_protoc_repo_impl
		integrity = PROTOC_VERSIONS[release_version][filename],
Error: key "protoc-29.0-rc2-osx-aarch_64.zip" not found in dictionary
ERROR: no such package '@@toolchains_protoc~~protoc~toolchains_protoc_hub.osx_aarch_64//': key "protoc-29.0-rc2-osx-aarch_64.zip" not found in dictionary
ERROR: /Users/andy/src/toolchains_protoc/examples/BUILD.bazel:7:14: //:foo_proto depends on @@toolchains_protoc~~protoc~toolchains_protoc_hub.osx_aarch_64//:prebuilt_protoc_toolchain in repository @@toolchains_protoc~~protoc~toolchains_protoc_hub.osx_aarch_64 which failed to fetch. no such package '@@toolchains_protoc~~protoc~toolchains_protoc_hub.osx_aarch_64//': key "protoc-29.0-rc2-osx-aarch_64.zip" not found in dictionary
ERROR: Analysis of target '//:foo_proto' failed; build aborted: Analysis failed
INFO: Elapsed time: 0.256s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
ERROR: Build did NOT complete successfully

Version

Development (host) and target OS/architectures: N/A

Output of bazel --version: bazel 7.3.0

Version of the Aspect rules, or other relevant rules from your
WORKSPACE or MODULE.bazel file: bazel_dep(name = "toolchains_protoc", version = "0.3.4")

Language(s) and/or frameworks involved: N/A

How to reproduce

Bump the protoc version in the examples directory to `v29.0-rc3` and build the examples.

Any other information?

The filename for release candidate versions should have a bonus dash between rc and the candidate number. It might also make sense to add another example that builds with latest to catch any future funkiness in tests.

[ipoletaev]

Faced the same one :) What's the recommended way to work it around for ones who uses 0.3.4. toolchains_protoc version? Shall I rather wait for 0.3.5 with the official protobuf v29.0 added?