fix: Add quirks mode for FTP compatibility, where read permission is required even if O_WRONLY is set

cmd/stfs/cmd/serve_ftp.go

@@ -193,6 +193,7 @@ var serveFTPCmd = &cobra.Command{
 				)
 			},
 			viper.GetBool(readOnlyFlag),
+			true, // FTP requires read permission even if `O_WRONLY` is set if cache is enabled
 
 			func(hdr *config.Header) {
 				jsonLogger.Trace("Header transform", hdr)

cmd/stfs/cmd/serve_http.go

@@ -128,9 +128,10 @@ var serveHTTPCmd = &cobra.Command{
 				Metadata: metadataPersister,
 			},
 
-			"",   // We never write
-			nil,  // We never write
-			true, // We never write
+			"",    // We never write
+			nil,   // We never write
+			true,  // We never write
+			false, // We never write
 
 			func(hdr *config.Header) {
 				jsonLogger.Trace("Header transform", hdr)