#!/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.

require 'trollop'

def error(message)
	STDERR.print "*** #{message}\n"
	exit 1
end

#STDERR.print "ARGV=#{ARGV.inspect}\nSSH_ORIGINAL_COMMAND=#{ENV['SSH_ORIGINAL_COMMAND']}\n"

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

#STDERR.print "after ARGV=#{ARGV.inspect}"

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

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

# force destination to be where we expect
#
if ARGV[0] == 'rsync'
	ARGV[-1] = "#{byteback_root}/current"
	exec(*ARGV)
elsif ARGV[0] == 'byteback-snapshot' || (ARGV[0] == 'sudo' && ARGV[1] == '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 :complete, "Mark current backup as complete"
end

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