From cb2d31ed98ed557cff0436ef9146bb184e504471 Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Fri, 23 Aug 2019 00:24:23 +0200
Subject: [PATCH] fix partial extract for hardlinked contentless file types,
 fixes #4725

if the file is not a regular file, but a hardlink slave with a not
extracted hardlink master, chunks will be None and we must not call
preload(chunks).

(cherry picked from commit 291d58efa1a2ca71b102012309214294cf8e0ec1)
---
 src/borg/archive.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/borg/archive.py b/src/borg/archive.py
index 86e8a62e0..5a5f19d47 100644
--- a/src/borg/archive.py
+++ b/src/borg/archive.py
@@ -293,7 +293,8 @@ class DownloadPipeline:
                             if source not in masters_preloaded:
                                 # we only need to preload *once* (for the 1st selected slave)
                                 chunks, _ = hardlink_masters[source]
-                                preload(chunks)
+                                if chunks is not None:
+                                    preload(chunks)
                                 masters_preloaded.add(source)
                 else:
                     # easy: we do not have a filter, thus all items are selected, thus we need to preload all chunks.