NET-962: add semver check (#2854)

* add semver check

* indentation on if

scripts/nm-quick.sh

@@ -708,7 +708,12 @@ upgrade() {
 	unset IMAGE_TAG
 	unset BUILD_TAG
 	IMAGE_TAG=$UI_IMAGE_TAG
-	BUILD_TAG=$UI_IMAGE_TAG
+	semver=$(chsv_check_version_ex "$UI_IMAGE_TAG")
+  	if [[ ! "$semver" ]]; then
+		BUILD_TAG=$LATEST
+	else
+		BUILD_TAG=$UI_IMAGE_TAG
+  	fi
 	echo "-----------------------------------------------------"
 	echo "Provide Details for pro installation:"
 	echo "    1. Log into https://app.netmaker.io"
@@ -734,7 +739,13 @@ downgrade () {
 	unset IMAGE_TAG
 	unset BUILD_TAG
 	IMAGE_TAG=$UI_IMAGE_TAG
-	BUILD_TAG=$UI_IMAGE_TAG
+
+	semver=$(chsv_check_version_ex "$UI_IMAGE_TAG")
+  	if [[ ! "$semver" ]]; then
+		BUILD_TAG=$LATEST
+	else
+		BUILD_TAG=$UI_IMAGE_TAG
+  	fi
 	save_config
 	if [ -a "$SCRIPT_DIR"/docker-compose.override.yml ]; then
 		rm -f "$SCRIPT_DIR"/docker-compose.override.yml
@@ -744,6 +755,23 @@ downgrade () {
 	install_netmaker
 }
 
+function chsv_check_version() {
+  if [[ $1 =~ ^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?$ ]]; then
+    echo "$1"
+  else
+    echo ""
+  fi
+}
+
+function chsv_check_version_ex() {
+  if [[ $1 =~ ^v.+$ ]]; then
+    chsv_check_version "${1:1}"
+  else
+    chsv_check_version "${1}"
+  fi
+}
+
+
 
 main (){