Allow custom data directory

Sources/App/Config.swift

@@ -20,6 +20,15 @@ struct Config: Codable {
     /// Authentication tokens for remotes allowed to write
     let writers: [String]
     
+    let dataDirectory: String?
+    
+    func customDataDirectory(or publicDirectory: String) -> URL {
+        guard let dataDirectory else {
+            return URL(fileURLWithPath: publicDirectory)
+        }
+        return URL(fileURLWithPath: dataDirectory)
+    }
+    
     func logURL(possiblyRelativeTo resourcesDirectory: URL) -> URL {
         guard let logPath else {
             return resourcesDirectory.appendingPathComponent("logs")

Sources/App/configure.swift

@@ -31,7 +31,8 @@ func configure(_ app: Application) async throws {
     app.http.server.configuration.port = config.port
     app.routes.defaultMaxBodySize = .init(stringLiteral: config.maxBodySize)
 
-    server = CapServer(in: URL(fileURLWithPath: publicDirectory))
+    let dataDirectory = config.customDataDirectory(or: publicDirectory)
+    server = CapServer(in: dataDirectory)
 
     provider = .init(observer: monitor, accessManager: config.writers)
     provider.asyncScheduler = asyncScheduler