Enhance cleanup_rules function to prevent script failure when no matching rules are found

scripts/iptables-mihomo-setup.sh

@@ -18,21 +18,23 @@ EXCLUDE_IFACES=("tun0" "wg0")
 # ----------------------------
 ipt() { iptables "$@"; }
 
-# Функция для удаления правил по комментарию (чтобы не тереть чужое)
-# Используем trick: добавляем комментарий ко всем правилам, чтобы потом их найти и удалить
+# Функция для удаления правил по комментарию
 cleanup_rules() {
   local table="$1"
   local chain="$2"
   local comment="$3"
   
-  # List rules with line numbers, grep by comment, sort reverse order (to delete safely), delete
+  # Добавлено "|| true" к grep, чтобы скрипт не падал, если правил нет (пустой grep возвращает 1)
   iptables -t "$table" -nL "$chain" --line-numbers 2>/dev/null | \
-  grep "$comment" | \
+  grep "$comment" || true | \
   sort -r | \
   awk '{print $1}' | \
   while read -r line; do
-    echo "Deleting rule $line from $table/$chain..."
-    iptables -t "$table" -D "$chain" "$line"
+    # Проверка на пустую строку, на случай если grep ничего не нашел
+    if [[ -n "$line" ]]; then
+        echo "Deleting rule $line from $table/$chain..."
+        iptables -t "$table" -D "$chain" "$line"
+    fi
   done
 }
 
@@ -64,7 +66,6 @@ cleanup_rules nat OUTPUT "MIHOMO-EXCLUDE"
 cleanup_rules nat PREROUTING "MIHOMO-REDIRECT"
 
 # 3. Flush and Delete Chains
-# Now that references are gone, we can safely kill the chains
 ipt -t mangle -F MIHOMO_TPROXY 2>/dev/null || true
 ipt -t mangle -X MIHOMO_TPROXY 2>/dev/null || true
 
@@ -100,8 +101,6 @@ ipt -t nat -A OUTPUT -m owner --uid-owner "${MIHOMO_UID}" -m comment --comment "
 ipt -t nat -A OUTPUT -p tcp -m comment --comment "MIHOMO-JUMP" -j MIHOMO_REDIR
 
 # --- APPLY TO INGRESS (wt0) ---
-# Exclude wt0 -> tun0/wg0 logic handled by routing mostly, but let's be safe if needed.
-# For now, strictly redirect TCP incoming on wt0
 ipt -t nat -A PREROUTING -i wt0 -p tcp -m comment --comment "MIHOMO-REDIRECT" -j REDIRECT --to-port "${REDIR_PORT}"