added metadata helper tool

cmd/metadatagen/main.go

@@ -0,0 +1,31 @@
+// Copyright (C) 2022 Marius Schellenberger
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"cachefs/pkg/fs"
+)
+
+var (
+	version string
+
+	dst      string
+	metadata string
+)
+
+func main() {
+	flag.StringVar(&dst, "dst", "", "local directory to cache files")
+	flag.StringVar(&metadata, "data", "", "path to metadata file")
+	flag.Parse()
+
+	err := fs.MetadataGenerator(metadata, dst)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	os.Exit(0)
+}