fix metadata generator

cmd/metadatagen/main.go

@@ -17,32 +17,39 @@ var (
 
 	dst      string
 	metadata string
+	fstat    bool
 )
 
+func fatal(err error) {
+	fmt.Println(err)
+	os.Exit(1)
+}
+
 func main() {
-	flag.StringVar(&dst, "dst", "", "url path to cache files (example: file:///mnt/cache)")
+	flag.StringVar(&dst, "dst", "", "url path to cache files (example: file:///mnt/cache, uses DST_KEY)")
 	flag.StringVar(&metadata, "data", "", "path to metadata file")
+	flag.BoolVar(&fstat, "fstat", false, "use fstat to determine real file size for sparse files")
 	flag.Parse()
 
 	var (
-		dstk []byte
-		err  error
+		dstk      []byte
+		err       error
+		encrypted bool
 	)
 	dstkey := os.Getenv("DST_KEY")
 	if dstkey != "" {
 		dstk, err = hex.DecodeString(dstkey)
-		fmt.Println(err)
-		os.Exit(1)
+		if err != nil {
+			fatal(err)
+		}
+		encrypted = true
 	}
 	dstfs, err := parse.FS(dst, dstk, true)
 	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
+		fatal(err)
 	}
-	err = fs.MetadataGenerator(metadata, dstfs)
+	err = fs.MetadataGenerator(metadata, dstfs, fstat, encrypted)
 	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
+		fatal(err)
 	}
-	os.Exit(0)
 }