#!/usr/bin/ruby
#
# Called by byteback-setup-client to set up a new byteback-setup-client
#

$LOAD_PATH.unshift('/usr/lib/byteback')

require 'fileutils'
require 'trollop'
require 'byteback/util'
require 'byteback/log'
include Byteback::Util
include Byteback::Log

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

@hostname = ARGV.shift
@pubkey = ARGV.join(' ')

error('You must call this from byteback-setup-client on remote host') unless
  @hostname &&
  /^ssh/.match(@pubkey) &&
  ENV['SSH_CONNECTION']

@client_ip = ENV['SSH_CONNECTION'].split(' ').first

Dir.chdir(ENV['HOME']) # don't know why we wouldn't be here

FileUtils.mkdir_p(@hostname)

error("Couldn't create btrfs subvolume") unless
  system("/sbin/btrfs subvolume create #{@hostname}/current")

FileUtils.mkdir_p('.ssh')

if File.exist?('.ssh/authorized_keys') &&
   File.read('.ssh/authorized_keys').match(@pubkey.split(/\s+/)[1])

  warn('This key already exists in .ssh/authorized_keys on server, nothing to do!')

else

  File.open('.ssh/authorized_keys', 'a+') do |fh|
    fh.print <<-LINE.gsub(/\n/, '') + "\n"
command="byteback-receive",
from="#{@client_ip}",
environment="BYTEBACK_HOST=#{@hostname}"
 #{@pubkey}
    LINE
  end
end