feat: provide toolchain

BUILD.bazel

@@ -3,6 +3,7 @@ package(default_visibility = ["//visibility:public"])
 load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_library")
 load("@rules_rust//cargo:defs.bzl", "cargo_build_script")
 load("@crate_index_protobuf//:defs.bzl", "all_crate_deps")
+load("//:toolchains.bzl", "pact_protobuf_plugin_toolchain")
 
 # This will run the build script from the root of the workspace, and
 # collect the outputs.
@@ -44,3 +45,20 @@ filegroup(
     srcs = ['pact-plugin.json'],
     visibility = ["//visibility:public"],
 )
+
+pact_protobuf_plugin_toolchain(
+    name = "toolchain_impl",
+    protobuf_plugin = ":pact_protobuf_plugin_bin",
+    manifest = ":pact-plugin"
+)
+
+toolchain(
+    name = "toolchain",
+    toolchain = ":toolchain_impl",
+    toolchain_type = ":toolchain_type",
+)
+
+toolchain_type(
+    name = "toolchain_type",
+    visibility = ["//visibility:public"],
+)

repositories.bzl

@@ -14,6 +14,6 @@ def repos():
         git_repository,
         name = "source_protobuf",
         remote = "https://github.com/opicaud/pact-protobuf-plugin",
-        commit = "3a2b8b621beb044b675c5809389844a304574370",
+        branch = "toolchain"
     )
 

toolchains.bzl

@@ -0,0 +1,24 @@
+"""pact_protobuf_plugin toolchain implementation"""
+
+def _pact_protobuf_plugin_toolchain_impl(ctx):
+    return platform_common.ToolchainInfo(
+        protobuf_plugin = ctx.file.protobuf_plugin,
+        manifest = ctx.file.manifest
+    )
+
+pact_protobuf_plugin_toolchain = rule(
+    implementation = _pact_protobuf_plugin_toolchain_impl,
+    doc = "A pact protobuf plugin toolchain",
+    attrs = {
+        "protobuf_plugin": attr.label(
+            doc = "A pact protobuf plugin binary",
+            allow_single_file = True,
+            mandatory = True,
+        ),
+        "manifest": attr.label(
+            doc = "A json manifest",
+            allow_single_file = True,
+            mandatory = True,
+        )
+    },
+)