Add script to copy proto

Author: XuanWang-Amos

tools/buildgen/copy_protos.sh

@@ -0,0 +1,42 @@
+#! /bin/bash
+# Copyright 2025 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+set -e
+
+GRPC_ROOT=$(realpath "$(dirname "$0")/../..")
+
+# Source and destination directories (base paths).
+SRC_BASE="$GRPC_ROOT/src/proto/grpc"
+DST_BASE="$GRPC_ROOT/src/python"
+
+copy_proto() {
+  local proto_name="$1"
+  local src_subdir="$2"
+  local dst_subdir="$3"
+
+  local src_file="$SRC_BASE/$src_subdir/$proto_name.proto"
+  local dst_file="$DST_BASE/$dst_subdir/$proto_name.proto"
+
+  cp "$src_file" "$dst_file"
+  echo "Copied: $src_file -> $dst_file"
+}
+
+# copy_proto proto_name src_subdir dst_subdir
+copy_proto "channelz" "channelz" "grpcio_channelz/grpc_channelz/v1"
+copy_proto "health" "health/v1" "grpcio_health_checking/grpc_health/v1"
+copy_proto "reflection" "reflection/v1alpha" "grpcio_reflection/grpc_reflection/v1alpha"
+
+echo "Proto files copied successfully."

tools/buildgen/generate_projects.sh

@@ -62,6 +62,7 @@ generate_projects_virtual_environment/bin/python src/python/grpcio_observability
 TEST=true tools/buildgen/build_cleaner.py build_autogenerated.yaml
 
 . tools/buildgen/generate_build_additions.sh
+. tools/buildgen/copy_protos.sh
 
 # Instead of generating from a single build.yaml, we've split it into
 # - build_handwritten.yaml: manually written metadata