added noerror function to execute stuff outside of error control system

lib/aaa_errors.sh

@@ -81,6 +81,20 @@ function backtrace
 }
 
 
+# ------------------------------------------------------------------------------
+# Execute command outside of error control
+noerror()
+{
+    set +o errexit
+    trap - ERR
+
+    $@
+
+    trap "error ${LINENO}" ERR
+    set -o errexit
+}
+
+
 # ------------------------------------------------------------------------------
 # Test and exit if not root (or any UID 0 user)
 check_root()

modules/upgrade_dist.sh

@@ -47,7 +47,7 @@ upgrade_dist()
 precheck_upgrade_dist()
 {
     prnt I "Vérification du réseau..."
-    wget -q --tries=10 --timeout=20 --spider http://www.cnrs.fr
+    noerror wget -q --tries=10 --timeout=20 --spider http://www.cnrs.fr
     if [[ ! $? -eq 0 ]]; then
         prnt E "Réseau non fonctionnel ! Abandon."
         die 160