Refactor

Author: aranjans

scripts/protoc_installer.sh

@@ -1,5 +1,22 @@
 #!/bin/bash
-# Install protoc
+# 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.
+
+set -eu -o pipefail
+
+# Perform installation of protoc from source based on OS.
+
 PROTOC_VERSION="25.2"
 
 # Function to download pre-built binaries for Linux with
@@ -25,10 +42,10 @@ install_protoc() {
     die "Unsupported architecture. Please consider manual installation."
   fi
   # Detect the Operating System
-  OS=$(uname -s)
-  case "$OS" in
+  case "$(uname -s)" in
     "Darwin") download_binary $ARCH "osx" "$1";;
     "Linux") download_binary $ARCH "linux" $1;;
-  *) echo "Unsupported operating system. Please consider manual installation." ;;
+  *) echo "Please consider manual installation from \
+     https://github.com/protocolbuffers/protobuf/releases/ and add to PATH" ;;
   esac
 }