From: Alan J. Pippin <alan@pippins.net>
Date: Mon, 1 Feb 2021 01:44:04 +0000 (-0700)
Subject: Added new option to expect empty remote lists when backing up to a new disk
X-Git-Url: http://git.pippins.net/embedvideo/.git/static/images/%7Blink_participation%7D?a=commitdiff_plain;h=042746138ba0f15394db01ce99dd5b5e81002451;p=zfs-ubuntu%2F.git

Added new option to expect empty remote lists when backing up to a new disk

Change-Id: I77f3f0323f876adbb3e46640dc3acee9e3b43146
---

diff --git a/zfs-replicate b/zfs-replicate
index 7f205e2..a5a3ad9 100755
--- a/zfs-replicate
+++ b/zfs-replicate
@@ -170,7 +170,7 @@ $zfs list -H -t snapshot |
     grep ^${backup_pool}/${remote_fs}@ |
     grep -v ^${backup_pool}/${current_backup_marker} | 
     awk "{gsub(/^$backup_pool./,\"\",\$1); print\$1}" > $local_list
-if [ $? != 0 ]; then
+if [[ $? != 0 ]] && [[ $expect_empty_remote_list == 0 ]]; then
   fatal_and_exit "-E- local $zfs list on $hostname command failed" $mailto
 fi
 
diff --git a/zfs-scripts.conf.dist b/zfs-scripts.conf.dist
index 894f783..e4f3651 100644
--- a/zfs-scripts.conf.dist
+++ b/zfs-scripts.conf.dist
@@ -38,6 +38,11 @@ backup_pool=
 # import backup pool before replication and export backup pool after replication
 import_export_backup_pool=0
 
+# expect empty remote list 
+# - set to 1 if backing up any new filesystems for the first time
+# - set to 0 if not backing up new filesystems for the first time (to prevent dropping the entire filesystem if the remote list command fails)
+expect_empty_remote_list=0
+
 # when this variable is set, local filesystems will be destroyed
 # before receiving a full streams into them from the remote source.
 # if it needs to do this, and this option is set to 0, it aborts.