From c4753c39391bf30c3f07303e9d1e03816f1e7f72 Mon Sep 17 00:00:00 2001
From: Abhishek Ranjan <159750762+aranjans@users.noreply.github.com>
Date: Mon, 10 Jun 2024 23:26:01 +0530
Subject: [PATCH] scripts: improve regenerate.sh to use the correct proto
 compiler version (#7064)

---
 doc.go                                 |  2 +-
 scripts/install_protoc.sh              | 69 ++++++++++++++++++++++++
 regenerate.sh => scripts/regenerate.sh | 73 ++++++++++++++------------
 scripts/vet-proto.sh                   | 17 ++----
 4 files changed, 114 insertions(+), 47 deletions(-)
 create mode 100755 scripts/install_protoc.sh
 rename regenerate.sh => scripts/regenerate.sh (63%)

diff --git a/doc.go b/doc.go
index 0022859ad746..e7b532b6f806 100644
--- a/doc.go
+++ b/doc.go
@@ -16,7 +16,7 @@
  *
  */
 
-//go:generate ./regenerate.sh
+//go:generate ./scripts/regenerate.sh
 
 /*
 Package grpc implements an RPC system called gRPC.
diff --git a/scripts/install_protoc.sh b/scripts/install_protoc.sh
new file mode 100755
index 000000000000..f0b8aef56178
--- /dev/null
+++ b/scripts/install_protoc.sh
@@ -0,0 +1,69 @@
+#!/bin/bash
+# Copyright 2024 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.
+#
+# This script ensures the installation of protobuf on client machine.
+# In case of manual run of this script, make sure you pass the args
+# expected at
+# https://github.com/grpc/grpc-go/blob/master/scripts/install_protoc.sh#L60
+
+set -eu -o pipefail
+
+source "$(dirname $0)/vet-common.sh"
+
+# The version of protoc that will be installed.
+PROTOC_VERSION="25.2"
+
+# Function to download pre-built binaries for Linux with
+# ARCH as $1, OS as $2, and INSTALL_PATH as $3 arguments.
+download_binary() {
+  # Check if protoc is already available.
+  if command -v protoc &> /dev/null; then
+      if INSTALL_VERSION=$(protoc --version | cut -d' ' -f2 2>/dev/null); then
+        if [ "$INSTALL_VERSION" = "$PROTOC_VERSION" ]; then
+          echo "protoc version $PROTOC_VERSION is already installed."
+          return
+        else
+          die "Existing protoc version ($INSTALL_VERSION) differs. Kindly make sure you have $PROTOC_VERSION installed."
+        fi
+      else
+        echo "Unable to determine installed protoc version. Starting the installation."
+      fi
+  fi
+  DOWNLOAD_URL="https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-$2-$1.zip"
+  # Download and unzip
+  curl -LO "$DOWNLOAD_URL"
+  INSTALL_DIR="${3:-${GOBIN:-${GOPATH:-$HOME/go}}}"
+  unzip "protoc-${PROTOC_VERSION}-$2-$1.zip" -d $INSTALL_DIR
+  rm "protoc-${PROTOC_VERSION}-$2-$1.zip"
+  rm "${INSTALL_DIR}/readme.txt"
+}
+
+# Detect the architecture
+case "$(uname -m)" in
+  "x86_64") ARCH="x86_64";;
+  "aarch64") ARCH="aarch_64";;
+  "arm64") ARCH="aarch_64";;
+*) die "Unsupported architecture. Please consider manual installation from \
+       https://github.com/protocolbuffers/protobuf/releases/ and add to PATH."
+esac
+
+# Detect the Operating System
+INSTALL_PATH=${1:+"$1"}
+case "$(uname -s)" in
+  "Darwin") download_binary $ARCH "osx" "$INSTALL_PATH";;
+  "Linux") download_binary $ARCH "linux" "$INSTALL_PATH";;
+*) die "Unsupported OS. Please consider manual installation from \
+   https://github.com/protocolbuffers/protobuf/releases/ and add to PATH" ;;
+esac
diff --git a/regenerate.sh b/scripts/regenerate.sh
similarity index 63%
rename from regenerate.sh
rename to scripts/regenerate.sh
index 3edca296c224..c5d7b1a645f0 100755
--- a/regenerate.sh
+++ b/scripts/regenerate.sh
@@ -19,12 +19,15 @@ WORKDIR=$(mktemp -d)
 
 function finish {
   rm -rf "$WORKDIR"
+  # Revert back the PATH to client's original value
+  export PATH=$ORIGINAL_PATH
 }
 trap finish EXIT
 
-export GOBIN=${WORKDIR}/bin
-export PATH=${GOBIN}:${PATH}
-mkdir -p ${GOBIN}
+GOBIN="${WORKDIR}"/bin
+ORIGINAL_PATH=$PATH
+export PATH="${GOBIN}:${PATH}"
+mkdir -p "${GOBIN}"
 
 echo "remove existing generated files"
 # grpc_testing_not_regenerate/*.pb.go is not re-generated,
@@ -38,39 +41,41 @@ echo "go install cmd/protoc-gen-go-grpc"
 (cd cmd/protoc-gen-go-grpc && go install .)
 
 echo "git clone https://github.com/grpc/grpc-proto"
-git clone --quiet https://github.com/grpc/grpc-proto ${WORKDIR}/grpc-proto
+git clone --quiet https://github.com/grpc/grpc-proto "${WORKDIR}/grpc-proto"
 
 echo "git clone https://github.com/protocolbuffers/protobuf"
-git clone --quiet https://github.com/protocolbuffers/protobuf ${WORKDIR}/protobuf
+git clone --quiet https://github.com/protocolbuffers/protobuf "${WORKDIR}/protobuf"
 
 # Pull in code.proto as a proto dependency
-mkdir -p ${WORKDIR}/googleapis/google/rpc
+mkdir -p "${WORKDIR}/googleapis/google/rpc"
 echo "curl https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto"
-curl --silent https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto > ${WORKDIR}/googleapis/google/rpc/code.proto
+curl --silent https://raw.githubusercontent.com/googleapis/googleapis/master/google/rpc/code.proto > "${WORKDIR}/googleapis/google/rpc/code.proto"
 
-mkdir -p ${WORKDIR}/out
+source ./scripts/install_protoc.sh $WORKDIR
+
+mkdir -p "${WORKDIR}/out"
 
 # Generates sources without the embed requirement
 LEGACY_SOURCES=(
-  ${WORKDIR}/grpc-proto/grpc/binlog/v1/binarylog.proto
-  ${WORKDIR}/grpc-proto/grpc/channelz/v1/channelz.proto
-  ${WORKDIR}/grpc-proto/grpc/health/v1/health.proto
-  ${WORKDIR}/grpc-proto/grpc/lb/v1/load_balancer.proto
+  "${WORKDIR}/grpc-proto/grpc/binlog/v1/binarylog.proto"
+  "${WORKDIR}/grpc-proto/grpc/channelz/v1/channelz.proto"
+  "${WORKDIR}/grpc-proto/grpc/health/v1/health.proto"
+  "${WORKDIR}/grpc-proto/grpc/lb/v1/load_balancer.proto"
   profiling/proto/service.proto
-  ${WORKDIR}/grpc-proto/grpc/reflection/v1alpha/reflection.proto
-  ${WORKDIR}/grpc-proto/grpc/reflection/v1/reflection.proto
+  "${WORKDIR}/grpc-proto/grpc/reflection/v1alpha/reflection.proto"
+  "${WORKDIR}/grpc-proto/grpc/reflection/v1/reflection.proto"
 )
 
 # Generates only the new gRPC Service symbols
 SOURCES=(
   $(git ls-files --exclude-standard --cached --others "*.proto" | grep -v '^profiling/proto/service.proto$')
-  ${WORKDIR}/grpc-proto/grpc/gcp/altscontext.proto
-  ${WORKDIR}/grpc-proto/grpc/gcp/handshaker.proto
-  ${WORKDIR}/grpc-proto/grpc/gcp/transport_security_common.proto
-  ${WORKDIR}/grpc-proto/grpc/lookup/v1/rls.proto
-  ${WORKDIR}/grpc-proto/grpc/lookup/v1/rls_config.proto
-  ${WORKDIR}/grpc-proto/grpc/testing/*.proto
-  ${WORKDIR}/grpc-proto/grpc/core/*.proto
+  "${WORKDIR}/grpc-proto/grpc/gcp/altscontext.proto"
+  "${WORKDIR}/grpc-proto/grpc/gcp/handshaker.proto"
+  "${WORKDIR}/grpc-proto/grpc/gcp/transport_security_common.proto"
+  "${WORKDIR}/grpc-proto/grpc/lookup/v1/rls.proto"
+  "${WORKDIR}/grpc-proto/grpc/lookup/v1/rls_config.proto"
+  "${WORKDIR}/grpc-proto/grpc/testing/*.proto"
+  "${WORKDIR}/grpc-proto/grpc/core/*.proto"
 )
 
 # These options of the form 'Mfoo.proto=bar' instruct the codegen to use an
@@ -95,29 +100,29 @@ for src in ${SOURCES[@]}; do
   echo "protoc ${src}"
   protoc --go_out=${OPTS}:${WORKDIR}/out --go-grpc_out=${OPTS},use_generic_streams_experimental=true:${WORKDIR}/out \
     -I"." \
-    -I${WORKDIR}/grpc-proto \
-    -I${WORKDIR}/googleapis \
-    -I${WORKDIR}/protobuf/src \
-    ${src}
+    -I"${WORKDIR}/grpc-proto" \
+    -I"${WORKDIR}/googleapis" \
+    -I"${WORKDIR}/protobuf/src" \
+    "${src}"
 done
 
 for src in ${LEGACY_SOURCES[@]}; do
   echo "protoc ${src}"
-  protoc --go_out=${OPTS}:${WORKDIR}/out --go-grpc_out=${OPTS},require_unimplemented_servers=false:${WORKDIR}/out \
+  protoc --go_out="${OPTS}:${WORKDIR}/out" --go-grpc_out="${OPTS}",require_unimplemented_servers=false:"${WORKDIR}/out" \
     -I"." \
-    -I${WORKDIR}/grpc-proto \
-    -I${WORKDIR}/googleapis \
-    -I${WORKDIR}/protobuf/src \
-    ${src}
+    -I"${WORKDIR}/grpc-proto" \
+    -I"${WORKDIR}/googleapis" \
+    -I"${WORKDIR}/protobuf/src" \
+    "${src}"
 done
 
 # The go_package option in grpc/lookup/v1/rls.proto doesn't match the
 # current location. Move it into the right place.
-mkdir -p ${WORKDIR}/out/google.golang.org/grpc/internal/proto/grpc_lookup_v1
-mv ${WORKDIR}/out/google.golang.org/grpc/lookup/grpc_lookup_v1/* ${WORKDIR}/out/google.golang.org/grpc/internal/proto/grpc_lookup_v1
+mkdir -p "${WORKDIR}/out/google.golang.org/grpc/internal/proto/grpc_lookup_v1"
+mv "${WORKDIR}"/out/google.golang.org/grpc/lookup/grpc_lookup_v1/* "${WORKDIR}/out/google.golang.org/grpc/internal/proto/grpc_lookup_v1"
 
 # grpc_testing_not_regenerate/*.pb.go are not re-generated,
 # see grpc_testing_not_regenerate/README.md for details.
-rm ${WORKDIR}/out/google.golang.org/grpc/reflection/test/grpc_testing_not_regenerate/*.pb.go
+rm "${WORKDIR}"/out/google.golang.org/grpc/reflection/test/grpc_testing_not_regenerate/*.pb.go
 
-cp -R ${WORKDIR}/out/google.golang.org/grpc/* .
+cp -R "${WORKDIR}"/out/google.golang.org/grpc/* .
diff --git a/scripts/vet-proto.sh b/scripts/vet-proto.sh
index 26c1ac65885a..56b423593cb9 100755
--- a/scripts/vet-proto.sh
+++ b/scripts/vet-proto.sh
@@ -20,18 +20,11 @@ trap cleanup EXIT
 # consistent with the place where all binaries installed by scripts in this repo
 # go.)
 if [[ "$1" = "-install" ]]; then
-  if [[ "${GITHUB_ACTIONS}" = "true" ]]; then
-    PROTOBUF_VERSION=25.2 # Shows up in pb.go files as v4.22.0
-    PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
-    pushd /home/runner/go
-      wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
-      unzip ${PROTOC_FILENAME}
-      protoc --version # Check that the binary works.
-    popd
-  else 
-    # TODO: replace with install protoc when https://github.com/grpc/grpc-go/pull/7064 is merged.
-    die "-install currently intended for use in CI only."
-  fi
+    if [[ "${GITHUB_ACTIONS}" = "true" ]]; then
+      source ./scripts/install_protoc.sh "/home/runner/go"
+    else
+      die "run protoc installer https://github.com/grpc/grpc-go/blob/master/scripts/install_protoc.sh"
+    fi
   echo SUCCESS
   exit 0
 elif [[ "$#" -ne 0 ]]; then