Added internet check and warning when offline

utils.go

@@ -4,10 +4,12 @@ import (
 	"archive/zip"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 )
 
 //Utilities
@@ -91,3 +93,13 @@ func unzip(src, dest string) ([]string, error) {
 
 	return filenames, nil
 }
+
+func hasInternet() bool {
+	timeout := 2 * time.Second
+	conn, err := net.DialTimeout("tcp", "8.8.8.8:53", timeout)
+	if err != nil {
+		return false
+	}
+	conn.Close()
+	return true
+}