fix(sysctl): 提取 Debian 版本获取逻辑为独立函数

1.sh

@@ -82,7 +82,25 @@ sysctl_config() {
   SYSCTL_CONF="/etc/sysctl.conf"
   SYSCTL_CLEANUP_FILES=("/etc/sysctl.conf" "/etc/sysctl.d/99-sysctl.conf" "/etc/sysctl.d/999-custom.conf")
   if [ "$SYSTEM_TYPE" = "debian" ]; then
-    DEBIAN_VERSION=$(grep -oP 'VERSION_ID="\K[^"]+' /etc/os-release 2>/dev/null || cat /etc/debian_version 2>/dev/null | cut -d. -f1)
+      get_debian_major_version() {
+        local version_id=""
+
+        if [ -r /etc/os-release ]; then
+          version_id=$(sed -n 's/^VERSION_ID="\?\([^"[:space:]]*\)"\?$/\1/p' /etc/os-release | head -n 1)
+        fi
+
+        if [ -z "$version_id" ] && [ -r /etc/debian_version ]; then
+          version_id=$(head -n 1 /etc/debian_version)
+        fi
+
+        version_id=${version_id%%/*}
+        version_id=${version_id%%.*}
+
+        if [[ "$version_id" =~ ^[0-9]+$ ]]; then
+          echo "$version_id"
+        fi
+      }
+      DEBIAN_VERSION=$(get_debian_major_version)
 
     if [ -z "$DEBIAN_VERSION" ]; then
       echo "无法确定 Debian 版本，使用默认配置文件"