Remove spectre warning

src/freedombone-utils-webadmin

@@ -916,9 +916,26 @@ function webadmin_update_system_monitor {
 
     local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
     webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
+
+    spectre-meltdown-checker --no-color > "$webadmin_install_dir/spectre.txt"
+    if [ -f "$webadmin_install_dir/spectre.txt" ]; then
+        spectre_vulnerabilities=$(grep "VULNERABLE" "$webadmin_install_dir/spectre.txt" | grep -vc "NOT ")
+    else
+        spectre_vulnerabilities=0
+    fi
+
     if [ -f "$webadmin_install_dir/system_monitor_template.html" ]; then
         cp "$webadmin_install_dir/system_monitor_template.html" "$webadmin_install_dir/system_monitor.html"
 
+        # remove spectre warning
+        # shellcheck disable=SC2086
+        if [ $spectre_vulnerabilities -eq 0 ]; then
+            sed -i 's|images/spectre.png||g' "$webadmin_install_dir/system_monitor.html"
+            if [ -f "$webadmin_install_dir/spectre.txt" ]; then
+                rm "$webadmin_install_dir/spectre.txt"
+            fi
+        fi
+
         if [[ "$disk_use_percent" == *'%'* ]]; then
             sed -i "s|<div name=\"diskspace\" class=\"w3-container.*|<div name=\"diskspace\" class=\"w3-container w3-blue w3-round-xlarge\" style=\"width:$disk_use_percent\">$disk_use_percent</div>|g" "$webadmin_install_dir/system_monitor.html"
         fi