don't let user continue if not connected to the internet, fixed #4

lib/functions/welcome.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'dart:io';
 
-Widget welcome(next) {
+Widget welcome(next, connected) {
   return Column(
     crossAxisAlignment: CrossAxisAlignment.center,
     children: [
@@ -74,7 +74,7 @@ Widget welcome(next) {
               elevation: 0,
               padding: EdgeInsets.zero,
             ),
-            onPressed: next,
+            onPressed: connected ? next : null,
             child: Container(
               width: 500,
               height: 500,
@@ -93,21 +93,31 @@ Widget welcome(next) {
               ),
               child: Column(
                 mainAxisAlignment: MainAxisAlignment.spaceAround,
-                children: const [
-                  SizedBox(height: 20),
-                  Text("Start the installation",
+                children: [
+                  const SizedBox(height: 20),
+                  const Text("Start the installation",
                       style: TextStyle(
                           fontSize: 20,
                           fontWeight: FontWeight.bold,
                           color: Colors.white)),
-                  SizedBox(height: 5),
-                  Image(
+                  const SizedBox(height: 5),
+                  const Image(
                     image: AssetImage(
                       'assets/jade_logo.png',
                     ),
                     height: 400,
                     fit: BoxFit.scaleDown,
                   ),
+                  Visibility(
+                    visible: !connected,
+                    child: const Text(
+                      "You are not connected to the internet!",
+                      style: TextStyle(
+                          fontSize: 20,
+                          fontWeight: FontWeight.bold,
+                          color: Colors.red),
+                    ),
+                  ),
                 ],
               ),
             ),

lib/main.dart

@@ -37,6 +37,18 @@ Future<void> checkIsEfi(
   }
 }
 
+Future<void> checkConnected(
+  setState,
+) async {
+  final String scriptOutput =
+      await Process.run("/opt/jade_gui/scripts/checkNetwork.sh", [])
+          .then((ProcessResult result) {
+    return result.stdout;
+  });
+  bool connected = scriptOutput.contains("disconnected") ? false : true;
+  setState(connected);
+}
+
 Future<void> writeToLog(String message) async {
   await File('${env["HOME"]}/jade_log.txt')
       .readAsString()
@@ -85,6 +97,7 @@ class _JadeguiState extends State<Jadegui> {
   bool isEfi = false;
   bool ipv6 = false;
   bool enableTimeshift = true;
+  bool connected = false;
   bool running = false;
   bool runningInfo = false;
   bool runningPart = false;
@@ -108,6 +121,13 @@ class _JadeguiState extends State<Jadegui> {
   @override
   Widget build(BuildContext context) {
     setWindowSize();
+    checkConnected(
+      (value) {
+        setState(() {
+          connected = value;
+        });
+      },
+    );
     return Scaffold(
       backgroundColor: const Color.fromARGB(255, 23, 23, 23),
       body: Row(
@@ -305,11 +325,14 @@ class _JadeguiState extends State<Jadegui> {
             child: SizedBox(
               width: logicWidth,
               height: logicHeight,
-              child: welcome(() {
+              child: welcome(
+                () {
                   setState(() {
                     _selectedIndex = _selectedIndex + 1;
                   });
-              }),
+                },
+                connected,
+              ),
             ),
           ),
         );

scripts/checkNetwork.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+ping -c1 getcryst.al -q > /dev/null
+if [[ $? -eq 0 ]]; then
+	echo "connected"
+else
+	echo "disconnected"
+fi