separate configuration storage

EpsonPrintService/ConfigurationPaths.cs

@@ -0,0 +1,72 @@
+using System.Runtime.InteropServices;
+
+namespace EpsonPrintService;
+
+public static class ConfigurationPaths
+{
+    private const string LinuxConfigDir = "/root/epsonprintservice";
+    private const string LocalConfigFileName = "config.json";
+
+    public static string GetConfigPath()
+    {
+        // Check for explicit override via environment variable
+        var envPath = Environment.GetEnvironmentVariable("EPSON_CONFIG_PATH");
+        if (!string.IsNullOrEmpty(envPath))
+            return envPath;
+
+        // Windows: always use local config.json
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        {
+            return LocalConfigFileName;
+        }
+
+        // Linux: use persistent system directory
+        var persistentPath = Path.Combine(LinuxConfigDir, LocalConfigFileName);
+
+        // If persistent config exists, use it
+        if (File.Exists(persistentPath))
+        {
+            return persistentPath;
+        }
+
+        // If only local config exists, migrate it to persistent location
+        if (File.Exists(LocalConfigFileName))
+        {
+            MigrateConfig(LocalConfigFileName, persistentPath);
+            return persistentPath;
+        }
+
+        // Default to persistent path (will fail if doesn't exist, which is expected)
+        return persistentPath;
+    }
+
+    private static void MigrateConfig(string sourcePath, string destinationPath)
+    {
+        try
+        {
+            var destDir = Path.GetDirectoryName(destinationPath);
+            if (!string.IsNullOrEmpty(destDir) && !Directory.Exists(destDir))
+            {
+                Directory.CreateDirectory(destDir);
+            }
+
+            File.Copy(sourcePath, destinationPath, overwrite: false);
+            Console.WriteLine($"Migrated configuration from {sourcePath} to {destinationPath}");
+        }
+        catch (UnauthorizedAccessException)
+        {
+            Console.WriteLine($"Warning: Cannot migrate config to {destinationPath} (permission denied). Using local config.");
+            // Fall back to local config if we can't write to system directory
+        }
+        catch (IOException ex) when (ex.Message.Contains("already exists"))
+        {
+            // File was created by another process, that's fine
+        }
+    }
+
+    public static string GetConfigDirectory()
+    {
+        var configPath = GetConfigPath();
+        return Path.GetDirectoryName(configPath) ?? ".";
+    }
+}

EpsonPrintService/Program.cs

@@ -17,8 +17,10 @@ using EpsonPrintService;
 StandardKernel kernel = new StandardKernel();
 
 
+var configPath = ConfigurationPaths.GetConfigPath();
+Console.WriteLine($"Loading configuration from: {configPath}");
 var config = JsonSerializer.Deserialize<EpsonPrintServiceConfiguration>(
-    File.ReadAllText("config.json"));
+    File.ReadAllText(configPath));
 
 kernel.Bind<IDiscoveryService>().To<DiscoveryService>().InSingletonScope();
 kernel.Bind<HttpClient>().ToConstant(new HttpClient { Timeout = TimeSpan.FromSeconds(30) }).InSingletonScope();