Check the connection during installation (#1399)

Author: zen0bit

AM-INSTALLER

@@ -21,6 +21,16 @@ _check_dependency() {
 
 _check_dependency
 
+# Function to check online connections (uses github.com by default, as the database and CLI itself are stored/hosted there)
+_online_check() {
+	if ! wget -q --tries=3 --timeout=10 --spider https://github.com; then
+		printf "\n Installer wouldn't work offline\n\n Please check your internet connection and try again\n\n"
+		exit 1
+	fi
+}
+
+_online_check
+
 # INSTALL "AM" SYSTEM-WIDE
 _install_am() {
 	CACHEDIR="${XDG_CACHE_HOME:-$HOME/.cache}"