refactor: enable protoc toolchains

Author: alexeagle

.bazelrc

@@ -14,6 +14,9 @@ common --@aspect_rules_ts//ts:default_to_tsc_transpiler
 # We have some empty globs in this repo
 common --noincompatible_disallow_empty_glob
 
+# Never Compile protoc Again
+common --incompatible_enable_proto_toolchain_resolution
+
 # verbose
 common:verbose --@aspect_rules_ts//ts:verbose --worker_verbose
 

MODULE.bazel

@@ -28,6 +28,19 @@ bazel_dep(name = "gazelle", version = "0.36.0", dev_dependency = True, repo_name
 bazel_dep(name = "rules_go", version = "0.46.0", dev_dependency = True, repo_name = "io_bazel_rules_go")
 bazel_dep(name = "rules_nodejs", version = "6.1.0", dev_dependency = True)
 bazel_dep(name = "stardoc", version = "0.6.2", dev_dependency = True, repo_name = "io_bazel_stardoc")
+bazel_dep(name = "toolchains_protoc", version = "0.3.0", dev_dependency = True)
+
+# Should not be required, stardoc leaks a dependency
+bazel_dep(name = "rules_java", version = "7.6.1", dev_dependency = True)
+
+register_toolchains("//tools/toolchains:all")
+
+# pick up fix: https://github.com/bazelbuild/stardoc/pull/221
+git_override(
+    module_name = "stardoc",
+    commit = "3baa5d1761970c6285d2ac9c3adccfaac42f54c5",
+    remote = "https://github.com/bazelbuild/stardoc.git",
+)
 
 npm = use_extension("@aspect_rules_js//npm:extensions.bzl", "npm", dev_dependency = True)
 npm.npm_translate_lock(

WORKSPACE.bzlmod

@@ -1,3 +1,4 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_jar")
 load("//.github/workflows:deps.bzl", "aspect_workflows_github_actions_deps")
 
 aspect_workflows_github_actions_deps()
@@ -9,3 +10,10 @@ load(
 )
 
 fetch_shfmt()
+
+# Needed for stardoc to compile from Java sources
+http_jar(
+    name = "protobuf-java",
+    integrity = "sha256-kHLmD+Zs/11sDxGh3yHY8+Sym17ngrRcP8dfWfviuDk=",
+    urls = ["https://repo1.maven.org/maven2/com/google/protobuf/protobuf-java/4.27.0/protobuf-java-4.27.0.jar"],
+)

tools/toolchains/BUILD.bazel

@@ -0,0 +1,9 @@
+load("@rules_proto//proto:defs.bzl", "proto_lang_toolchain")
+
+proto_lang_toolchain(
+    name = "protoc_java_toolchain",
+    command_line = "--java_out=%s",
+    progress_message = "Generating Java proto_library %{label}",
+    runtime = "@protobuf-java//jar",
+    toolchain_type = "@rules_java//java/proto:toolchain_type",
+)