sync: Return the reader from importer instead of writing to a given Writer

admin/sync/importer_localfs.go

@@ -1,7 +1,6 @@
 package sync
 
 import (
-	"bufio"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -81,15 +80,11 @@ func (i LocalImporter) importFile(URI string, next func(string, string) (interfa
 	}
 }
 
-func (i LocalImporter) getFile(filename string, writer *bufio.Writer) error {
+func (i LocalImporter) getFile(filename string) (io.Reader, error) {
 	if fd, err := os.Open(path.Join(i.Base, filename)); err != nil {
-		return err
+		return nil, err
 	} else {
-		defer fd.Close()
-		reader := bufio.NewReader(fd)
-		reader.WriteTo(writer)
-		writer.Flush()
-		return nil
+		return fd, nil
 	}
 }