1 files changed, 22 insertions, 0 deletions
diff --git a/modules/util/io.go b/modules/util/io.go
index e5d7561bef..69b1d63145 100644
--- a/modules/util/io.go
+++ b/modules/util/io.go
@@ -4,6 +4,7 @@
 package util
 
 import (
+	"errors"
 	"io"
 )
 
@@ -17,3 +18,24 @@ func ReadAtMost(r io.Reader, buf []byte) (n int, err error) {
 	}
 	return n, err
 }
+
+// ErrNotEmpty is an error reported when there is a non-empty reader
+var ErrNotEmpty = errors.New("not-empty")
+
+// IsEmptyReader reads a reader and ensures it is empty
+func IsEmptyReader(r io.Reader) (err error) {
+	var buf [1]byte
+
+	for {
+		n, err := r.Read(buf[:])
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+		if n > 0 {
+			return ErrNotEmpty
+		}
+	}
+}