From 5afa270577b9c2d4032e9bdc99a96619f5b546ba Mon Sep 17 00:00:00 2001
From: Axel Burri <axel@tty0.ch>
Date: Mon, 15 Jul 2019 18:36:06 +0200
Subject: [PATCH] btrbk: action origin: correctly handle root subvolumes having
 uuid

---
 btrbk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/btrbk b/btrbk
index dd5dc2c..256fb6a 100755
--- a/btrbk
+++ b/btrbk
@@ -4723,7 +4723,8 @@ sub _origin_tree
   my $uuid = $node->{uuid} || die;
 
   # cache a bit, this might be large
-  $nodelist //= [ (sort { $a->{REL_PATH} cmp $b->{REL_PATH} } values %uuid_cache) ];
+  # note: root subvolumes dont have REL_PATH
+  $nodelist //= [ (sort { ($a->{REL_PATH} // "") cmp ($b->{REL_PATH} // "") } values %uuid_cache) ];
 
   my $out_path;
   $out_path = _fs_path($node);