#!/usr/bin/ruby
#
# Program to receive backups and run rsync in receive mode.  Must check that
# user as authorised by SSH is allowed to access particular directory.

$LOAD_PATH << '/usr/lib/byteback'

require 'trollop'
require 'byteback'
include Byteback::Log


if ENV['SSH_ORIGINAL_COMMAND']
	ARGV.concat(ENV['SSH_ORIGINAL_COMMAND'].split(" "))
end

byteback_host = ENV['BYTEBACK_HOST']
fatal("BYTEBACK_HOST environment not set") unless byteback_host

byteback_root = ENV['HOME'] + "/" + ENV["BYTEBACK_HOST"]
fatal("#{byteback_root} does not exist") unless File.directory?(byteback_root)

#
#  Force restores to be limited to the hostname we're connecting form
#
if ( ARGV[0] == 'restore' )
  ARGV[0] = 'rsync'
  a = []
  ARGV.each do |tmp|
    if ( tmp =~ /^\/(.*)/ )
      tmp = "#{byteback_host}/#{$1.dup}"
    end
    a.push(tmp)
  end
  exec(*a)
elsif ARGV[0] == 'rsync'
  ARGV[-1] = "#{byteback_root}/current"
  exec(*ARGV)
elsif ARGV[0] == 'byteback-snapshot'
  ARGV.concat(["--root", "#{byteback_root}"])
  exec(*ARGV)
end

opts = Trollop::options do
	opt :verbose, "Print diagnostics"
	opt :ping, "Check connection parameters and exit"
	opt :list, "Show backed up files matching the given pattern", :type => :string
	opt :restore, "Perform a restoration operation", :type => :string
	opt :complete, "Mark current backup as complete"
end

error("Please only choose one mode") if opts[:ping] && opts[:complete]
if opts[:complete]
	system("byteback-snapshot", "--root", byteback_root)
elsif opts[:list]
	system( "cd #{byteback_root} && find . -print | grep #{opts[:list]}" )
	exit(0 )
elsif opts[:ping]
	exit 0
else
	STDERR.print "byteback-receive failed\n"
	exit 9
end