#!/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

unless 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'