#!/usr/bin/ruby
#
# Program to create a snapshot and/or rotate a directory of backup snapshots 
# using btrfs subvolume commands.

$LOAD_PATH.unshift("/usr/lib/byteback")
require 'trollop'
require 'byteback'
include Byteback
include Byteback::Log

opts = Trollop::options do

    opt :root, "Backups directory (must be a btrfs subvolume)",
    	:type => :string

    opt :snapshot, "(ignored for compatibility)"

    opt :verbose, "Print diagnostics"

end

@root = opts[:root]
@verbose = opts[:verbose]

fatal("--root not readable") unless File.directory?("#{@root}")

@backups = BackupDirectory.new(@root)
snapshots = @backups.snapshots

if !snapshots.empty?
	last_snapshot_time = snapshots.last.time
	fatal("Last snapshot was less than six hours ago") unless 
		!last_snapshot_time || 
		Time.now - last_snapshot_time >= 6*60*60 # FIXME: make configurable
end

info "Making new snapshot"
@backups.new_snapshot! 

info "Finished"