ET#87293 [mysql-operator] port the build.sh script changes to 9.4.0 and trunk

adding the strict option checks and handle unknown args

Author: gipulla

build.sh

@@ -4,6 +4,19 @@
 # Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/
 #
 
+# Usage function
+print_usage() {
+cat <<EOF
+Usage: $0 -a <arch> -t <tag>
+
+Options:
+  -a  Architecture (amd64,arm64)
+  -t  Image tag (e.g., mysql/community-operator, mysql/enterprise-operator)
+  -h  Show this help message
+EOF
+}
+
+#Default values
 ARCH='amd64'
 IMG_TAG=$(./tag.sh)
 MAJOR_VERSION=${IMG_TAG:0:3}
@@ -14,14 +27,30 @@ while getopts "a:f:t:h" opt; do
     a)
       # Set architecture from -a option
       ARCH="$OPTARG"
+      if [[ -z "$ARCH" || ! "$ARCH" =~ ^(amd64|arm64)$ ]]; then
+        echo "Error: Invalid architecture '$ARCH'" >&2
+        exit 1
+      fi
       ;;
     f)
       # Set Dockerfile from -f option
       DOCKERFILE="$OPTARG"
+      if [[ -z "$DOCKERFILE" ]]; then
+        echo "Error: Docker file arg (-f) is required and cannot be empty." >&2
+        exit 1
+      fi
       ;;
     t)
       # Set image tag from -t option
       TAG="$OPTARG"
+      if [[ -z "$TAG" ]]; then
+        echo "Error: Image tag (-t) is required and cannot be empty." >&2
+        exit 1
+      fi
+      ;;
+    h)
+      print_usage
+      exit 0
       ;;
     \?)
       # Unknown option handler
@@ -31,4 +60,12 @@ while getopts "a:f:t:h" opt; do
   esac
 done
 
+#check if any unknown args passed to the script
+shift $((OPTIND - 1))
+if [[ $# -gt 0 ]]; then
+  echo "Error: Unknown arguments: $*" >&2
+  print_usage
+  exit 1
+fi
+
 docker build --build-arg http_proxy=${http_proxy} --build-arg https_proxy=${https_proxy} --build-arg no_proxy=${no_proxy} -f "${DOCKERFILE}" -t "${TAG}":${MAJOR_VERSION}-$ARCH .