From a43712ae8a198d3fb656896da50f0c9abf1bacc1 Mon Sep 17 00:00:00 2001
From: James Barnett <wes@wbarnett.us>
Date: Wed, 31 May 2017 14:22:26 -0400
Subject: [PATCH] Exclude source subvolumes

Find out parent mountpoint of /etc/conf.d/snapper, get UUID, and exclude
it from list of targets. If no external btrfs subvolumes found, exit.

Fixes #28.
---
 bin/snap-sync | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/bin/snap-sync b/bin/snap-sync
index c117a1b..a9d891e 100755
--- a/bin/snap-sync
+++ b/bin/snap-sync
@@ -141,8 +141,9 @@ else
     fi
 fi
 
-TARGETS="$($ssh findmnt -n -v -t btrfs -o TARGET --list)"
-UUIDS="$($ssh findmnt -n -v -t btrfs -o UUID --list)"
+EXCLUDE_UUID=$(findmnt -n -v -t btrfs --target /etc/conf.d/snapper -o UUID)
+TARGETS=$($ssh findmnt -n -v -t btrfs -o UUID,TARGET --list | grep -v $EXCLUDE_UUID | awk '{print $2}')
+UUIDS=$($ssh findmnt -n -v -t btrfs -o UUID,TARGET --list | grep -v $EXCLUDE_UUID | awk '{print $1}')
 
 declare -a TARGETS_ARRAY
 declare -a UUIDS_ARRAY
@@ -165,6 +166,10 @@ for x in $TARGETS; do
     i=$((i+1))
 done
 
+if [[ "${#UUIDS_ARRAY[$@]}" -eq 0 ]]; then
+    die "No external btrfs subvolumes found to backup to."
+fi
+
 if [[ "$disk_count" > 1 ]]; then
     printf "Multiple mount points were found with UUID $uuid_cmdline.\n"
     disk="-1"