From 97382ed9d8ab2caf3af58b07ee1691dc37062ae7 Mon Sep 17 00:00:00 2001
From: Jim Salter <github@jrs-s.net>
Date: Mon, 17 Nov 2014 10:22:20 -0500
Subject: [PATCH] added iszfsbusy check to pruning routine

---
 sanoid | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sanoid b/sanoid
index 30d4c02..5d6ce1d 100755
--- a/sanoid
+++ b/sanoid
@@ -201,7 +201,11 @@ sub prune_snapshots {
 					writelock('sanoid_pruning');
 					foreach my $snap( @prunesnaps ){
 						print "pruning $snap ... \n";
-						system($zfs, "destroy","-Rr",$snap) == 0 or die "could not remove $snap : $?";
+						if (iszfsbusy($path)) {
+							print "INFO: deferring pruning of $snap - $path is currently in zfs send or receive.\n";
+						} else {
+							system($zfs, "destroy","-Rr",$snap) == 0 or die "could not remove $snap : $?";
+						}
 					}
 					removelock('sanoid_pruning');
 					$forcecacheupdate = 1;