From 16cfb600b72ac73e6e3ed5946fd358b6384c6637 Mon Sep 17 00:00:00 2001
From: Axel Burri <axel@tty0.ch>
Date: Sun, 7 Jun 2015 11:52:39 +0200
Subject: [PATCH] btrbk: workaround for btrfs-progs < 3.17.3 (returns exit
 status 0 on errors for "btrfs subvolume show")

---
 ChangeLog | 4 ++++
 btrbk     | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 664f277..a988fec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+btrbk-current
+
+  * Bugfix: fix crash when using btrfs-progs < 3.17.3 (closes: #24).
+
 btrbk-0.19.1
 
   * Use "cgen" for snapshot comparison.
diff --git a/btrbk b/btrbk
index 162a9fc..76df0f5 100755
--- a/btrbk
+++ b/btrbk
@@ -625,6 +625,12 @@ sub btrfs_subvolume_detail($)
   my $ret = run_cmd("$rsh btrfs subvolume show '$path'", non_destructive => 1, catch_stderr => 1);
   return undef unless(defined($ret));
 
+  # workaround for btrfs-progs < 3.17.3 (returns exit status 0 on errors)
+  if($ret =~ /^ERROR: (.*)/) {
+    $err = $1;
+    return undef;
+  }
+
   my $real_path;
   if($ret =~ /^($file_match)/) {
     $real_path = $1;