Make proto_library based on protoc_minimal

BEGIN_PUBLIC
Internal change
END_PUBLIC

PiperOrigin-RevId: 655586183
Change-Id: Ib9f41309d50227efb18f0c050f8397d6a7ef94a1

src/main/starlark/builtins_bzl/common/proto/proto_library.bzl

@@ -336,7 +336,7 @@ lang_proto_library that is not in one of the listed packages.""",
             cfg = "exec",
             executable = True,
             allow_files = True,
-            default = configuration_field("proto", "proto_compiler"),
+            default = semantics.PROTOC_MINIMAL if hasattr(semantics, "PROTOC_MINIMAL") else configuration_field("proto", "proto_compiler"),
         ),
     }),
     fragments = ["proto"],

src/test/java/com/google/devtools/build/lib/packages/util/MockProtoSupport.java

@@ -52,7 +52,10 @@ private static void registerProtoToolchain(MockToolsConfig config) throws IOExce
             + "')");
   }
 
-  /** Create a dummy "net/proto2 compiler and proto APIs for all languages and versions. */
+  /**
+   * Create a dummy net/proto2 compiler, a dummy protoc_minimal and proto APIs for all languages and
+   * versions.
+   */
   private static void createNetProto2(MockToolsConfig config) throws IOException {
     config.create(
         "net/proto2/compiler/public/BUILD",
@@ -65,6 +68,18 @@ private static void createNetProto2(MockToolsConfig config) throws IOException {
         )
         """);
 
+    // TODO: b/305068148 - Remove this after blaze is released with protoc_minimal.
+    config.create(
+        "third_party/protobuf/compiler/BUILD",
+        """
+        package(default_visibility = ["//visibility:public"])
+
+        sh_binary(
+            name = "protoc_minimal",
+            srcs = ["protoc_minimal.sh"],
+        )
+        """);
+
     if (config.isRealFileSystem()) {
       // when using a "real" file system, import the jars and link to ensure compilation
       config.create(