Add FDA request dialog

SystemExtension/PacketTunnelProvider.swift

@@ -1,5 +1,7 @@
+import Libbox
 import Library
 import NetworkExtension
+import System
 
 class PacketTunnelProvider: ExtensionProvider {
     override func startTunnel(options: [String: NSObject]?) async throws {
@@ -10,6 +12,19 @@ class PacketTunnelProvider: ExtensionProvider {
         let username = usernameObject as! NSString
         FilePath.sharedDirectory = URL(filePath: "/Users/\(username)/Library/Group Containers/\(FilePath.groupName)")
         FilePath.iCloudDirectory = URL(filePath: "/Users/\(username)/Library/Mobile Documents/iCloud~\(FilePath.packageName.replacingOccurrences(of: ".", with: "~"))").appendingPathComponent("Documents", isDirectory: true)
+        let databasePath = FilePath.sharedDirectory.appendingPathComponent("settings.db").relativePath
+        if !FileManager.default.isReadableFile(atPath: databasePath) {
+            do {
+                let fd = try FileDescriptor.open(databasePath, .readOnly)
+                try! fd.close()
+                NSLog("Can access \(databasePath)")
+            } catch {
+                NSLog("Can't access \(databasePath): \(error.localizedDescription)")
+            }
+            try await Task.sleep(nanoseconds: NSEC_PER_MSEC * 100)
+            throw FullDiskAccessPermissionRequired.error
+        }
+
         self.username = String(username)
         try await super.startTunnel(options: options)
     }