Adding extremely simple fs based get and put in erasure-demo

cmd/erasure-demo/fs.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path"
+
+	"github.com/minio-io/minio/pkgs/storage"
+	"github.com/minio-io/minio/pkgs/storage/fsstorage"
+)
+
+func fsGet(config inputConfig, objectPath string) (io.Reader, error) {
+	var objectStorage storage.ObjectStorage
+	rootDir := path.Join(config.rootDir, config.storageDriver)
+	objectStorage = fsstorage.FileSystemStorage{RootDir: rootDir}
+	object, err := objectStorage.Get(objectPath)
+	if err != nil {
+		return nil, err
+	}
+	objectBuffer := bytes.NewBuffer(object)
+	return objectBuffer, nil
+}
+
+func fsPut(config inputConfig, objectPath string, reader io.Reader) error {
+	var err error
+	rootDir := path.Join(config.rootDir, config.storageDriver)
+	if err := os.MkdirAll(config.rootDir, 0700); err != nil {
+		return err
+	}
+	var objectStorage storage.ObjectStorage
+	buffer := new(bytes.Buffer)
+	buffer.ReadFrom(reader)
+	object := buffer.Bytes()
+	objectStorage = fsstorage.FileSystemStorage{RootDir: rootDir}
+	if err = objectStorage.Put(objectPath, object); err != nil {
+		return err
+	}
+	return nil
+}