From 0172e4a2406c792404a8d994967a4fd645cb5f44 Mon Sep 17 00:00:00 2001
From: Axel Burri <axel@tty0.ch>
Date: Sun, 6 Feb 2022 11:55:04 +0100
Subject: [PATCH] btrbk: fix mountinfo tree root detection

Set node as tree root if mount_id == parent_id. For some reasons this
is never the case on my (mostly gentoo) systems.

Regression from: eb69bc88 btrbk: refactor mountinfo
---
 btrbk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/btrbk b/btrbk
index 0f74d4b..0a56083 100755
--- a/btrbk
+++ b/btrbk
@@ -2958,7 +2958,8 @@ sub mountinfo_tree($)
   my %id = map +( $_->{mount_id} => $_ ), @$mountinfo;
   my $tree_root;
   foreach my $node (@$mountinfo) {
-    if(my $parent = $id{$node->{parent_id}}) {
+    my $parent = $id{$node->{parent_id}};
+    if($parent && ($node->{mount_id} != $node->{parent_id})) {
       $node->{PARENT} = $parent;
       push @{$parent->{SUBTREE}}, $node;
     } else {