From 6b71b68fcb0a8351bd1ccd07e815d1dc9ffd863f Mon Sep 17 00:00:00 2001
From: Axel Burri <axel@tty0.ch>
Date: Wed, 6 Apr 2016 20:41:14 +0200
Subject: [PATCH] btrbk: bugfix: do not run "rm" command with no arguments (on
 raw targets)

---
 btrbk | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/btrbk b/btrbk
index d7bfba0..f8feddd 100755
--- a/btrbk
+++ b/btrbk
@@ -3861,12 +3861,16 @@ MAIN:
           }
           my $ret;
           if($target_type eq "raw") {
-            DEBUG "[raw] delete:";
-            DEBUG "[raw]   file: $_->{PRINT}" foreach(@delete);
-            $ret = run_cmd({
-              cmd  => ['rm', (map { $_->{PATH} } @delete) ],
-              rsh  => $droot->{RSH},
-            });
+            if(scalar(@delete)) {
+              DEBUG "[raw] delete:";
+              DEBUG "[raw]   file: $_->{PRINT}" foreach(@delete);
+              $ret = run_cmd({
+                cmd  => ['rm', (map { $_->{PATH} } @delete) ],
+                rsh  => $droot->{RSH},
+              });
+            } else {
+              $ret = 0;
+            }
           }
           else {
             $ret = btrfs_subvolume_delete(\@delete, commit => config_key($droot, "btrfs_commit_delete"), type => "delete_garbled");