From ccf933b29a6966adce5b5c722119c94ca5a07c5c Mon Sep 17 00:00:00 2001
From: Tariq Ibrahim <tariq181290@gmail.com>
Date: Thu, 23 May 2019 10:54:06 -0700
Subject: [PATCH] return error when io.Copy fails in Digest

Signed-off-by: Tariq Ibrahim <tariq181290@gmail.com>
---
 pkg/provenance/sign.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkg/provenance/sign.go b/pkg/provenance/sign.go
index 5a7626424..26ae26031 100644
--- a/pkg/provenance/sign.go
+++ b/pkg/provenance/sign.go
@@ -405,7 +405,7 @@ func DigestFile(filename string) (string, error) {
 func Digest(in io.Reader) (string, error) {
 	hash := crypto.SHA256.New()
 	if _, err := io.Copy(hash, in); err != nil {
-		return "", nil
+		return "", err
 	}
 	return hex.EncodeToString(hash.Sum(nil)), nil
 }