thempatel commented on a change in pull request #16961:
URL: https://github.com/apache/beam/pull/16961#discussion_r830357685



##########
File path: sdks/go/scripts/genmodel.sh
##########
@@ -0,0 +1,81 @@
+#!/bin/bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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
+
+if [[ -z "$(which protoc)" ]]; then
+  echo "protoc not found on path"
+  exit 1
+fi
+
+SCRIPT_DIR="$( realpath "$( dirname "${BASH_SOURCE[0]}" )" )"
+if [[ -z $SCRIPT_DIR ]]; then
+  echo "unable to resolve path to script"
+  exit 1
+fi
+
+PROJECT_ROOT="$(realpath "$(dirname $SCRIPT_DIR)/../..")"
+if [[ -z "$PROJECT_ROOT" ]]; then
+  echo "unable to resolve path to project root"
+  exit 1
+fi
+
+if [[ -z "$(which go)" ]]; then
+  echo "go runtime missing"
+  exit 1
+fi
+
+if [[ -z "$GOPATH" ]]; then
+  export GOPATH="$(go env GOPATH)"

Review comment:
       I need help making a decision on this one, it looks like 
`protoc-gen-go-grpc` is released separately from 
https://github.com/grpc/grpc-go despite being in the same repository. When 
performing
   
   `go install google.golang.org/grpc/cmd/protoc-gen-go-grpc` without a version 
number, i.e. relying on what's in the go.mod file, the downloaded version is 
`v.1.10`.
   
   ```sh
   "$(go env GOPATH)/bin/protoc-gen-go-grpc" --versionprotoc-gen-go-grpc 1.1.0
   protoc-gen-go-grpc 1.1.0
   ```
   
   and the resulting generated files lose the version and path info:
   
   ```diff
   // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
   -// versions:
   -// - protoc-gen-go-grpc v1.1.0
   -// - protoc             v3.19.4
   -// source: org/apache/beam/model/pipeline/v1/beam_runner_api.proto
   ```
   
   if I add a dedicated version number to the go.mod file, like so:
   
   ```diff
        google.golang.org/api v0.45.0
        google.golang.org/genproto v0.0.0-20210728212813-7823e685a01f
        google.golang.org/grpc v1.39.0
   +    google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.2.0 // indirect
        google.golang.org/protobuf v1.27.1
        gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
        gopkg.in/linkedin/goavro.v1 v1.0.5 // indirect
   ```
   
   then the version numbers come back. Same result if I replace the version 
number in go.mod with `ebf6a4b`. The question is, how do we want to handle the 
difference in release versions for this?




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