btrfish/backup.fish

#!/usr/bin/fish

set scriptdir (dirname (status --current-filename))

source $scriptdir/config.fish
source $scriptdir/utils.fish

if not test -d $subvoldir
	echo "Backup directory doesn't exist, run bootstrap.fish first!"
	exit
end

echo "Creating new snapshots..."
for pair in (get-subvol-mounts)
	set subvol (get-subvol $pair)
	set mount (get-mount $pair)

	set safename (clean-name $subvol)
	set safepath $subvoldir/$safename

	if test -d $safepath
		if not test -f $mount/.btrfish-lock
			sudo btrfs subvolume snapshot -r $mount $safepath-new

			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
end

echo "Syncing..."
sync

echo "Sending to target..."
for snapshot in $snapshots
	sudo btrfs send -p $snapshot $snapshot-new | receive-on-target
	while [ $status != 0 ]
		echo "Sending failed, retrying..."
		sleep 5
		sudo btrfs send -p $snapshot $snapshot-new | receive-on-target
	end
end

echo "Replacing old snapshots..."
for snapshot in $snapshots
	sudo btrfs subvolume delete $snapshot
	sudo mv $snapshot-new $snapshot
end

echo "Renaming subvolumes on target..."
for pair in $pairs
	set subvol (clean-name (get-subvol $pair))
	set mount (get-mount $pair)

	if not test -f $mount/.btrfish-keepone
		rename-target-subvolume $subvol $subvol.(date +%Y-%m-%d)
		while [ $status != 0 ]
			echo "Renaming failed, retrying..."
			sleep 5
			rename-target-subvolume $subvol $subvol.(date +%Y-%m-%d)
		end
	else
		delete-target-subvolume $subvol
		while [ $status != 0 ]
			echo "Deleting failed, retrying..."
			sleep 5
			delete-target-subvolume $subvol
		end
	end

	rename-target-subvolume $subvol-new $subvol
	while [ $status != 0 ]
		echo "Renaming failed, retrying..."
		sleep 5
		rename-target-subvolume $subvol-new $subvol
	end

	sudo rm $mount/.btrfish-lock
end

echo "Done!"