From 79bae2d82790d8334e3b91302ffc243206489c54 Mon Sep 17 00:00:00 2001
From: Les De Ridder <les@lesderid.net>
Date: Wed, 8 Jun 2016 16:05:56 +0000
Subject: [PATCH] Add lock files

---
 backup.fish | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/backup.fish b/backup.fish
index 49c8f6f..475a094 100755
--- a/backup.fish
+++ b/backup.fish
@@ -19,9 +19,16 @@ for pair in (get-subvol-mounts)
 	set safepath $subvoldir/$safename
 
 	if test -d $safepath
-		sudo btrfs subvolume snapshot -r $mount $safepath-new
+		if not test -f $mount/.btrfish-lock
+			sudo btrfs subvolume snapshot -r $mount $safepath-new
 
-		set snapshots $snapshots $safepath
+			sudo touch $mount/.btrfish-lock
+
+			set snapshots $snapshots $safepath
+			set pairs $pairs $pair
+		else
+			echo "$mount/.btrfish-lock exists, skipping..."
+		end
 	else
 		echo $mount "is not bootstrapped and will not be included in the backups!"
 	end
@@ -42,13 +49,13 @@ for snapshot in $snapshots
 end
 
 echo "Renaming subvolumes on target..."
-for pair in (get-subvol-mounts)
+for pair in $pairs
 	set subvol (clean-name (get-subvol $pair))
 
-	if test -d $subvoldir/$subvol
-		rename-target-subvolume $subvol $subvol.(date +%Y-%m-%d)
-		rename-target-subvolume $subvol-new $subvol
-	end
+	rename-target-subvolume $subvol $subvol.(date +%Y-%m-%d)
+	rename-target-subvolume $subvol-new $subvol
+
+	sudo rm (get-mount $pair)/.btrfish-lock
 end
 
 echo "Done!"