From aa44bf1cd17b7f261acfd7b3e9a2eecc4d21b238 Mon Sep 17 00:00:00 2001
From: Eli Schwartz <eschwartz@archlinux.org>
Date: Thu, 9 May 2019 07:10:06 -0400
Subject: [PATCH] py3: hashlib .hexdigest() always returns a hexadecimal string

This is a subset of ascii and cannot be decoded.
---
 src/calibre/srv/books.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/srv/books.py b/src/calibre/srv/books.py
index 3fd0bed4da..d8ceeede36 100644
--- a/src/calibre/srv/books.py
+++ b/src/calibre/srv/books.py
@@ -50,7 +50,7 @@ def books_cache_dir():
 
 def book_hash(library_uuid, book_id, fmt, size, mtime):
     raw = json_dumps((library_uuid, book_id, fmt.upper(), size, mtime, RENDER_VERSION))
-    return sha1(raw).hexdigest().decode('ascii')
+    return sha1(raw).hexdigest()
 
 
 staging_cleaned = False