#!/usr/bin/ruby
#
# Run on a client machine to set up backups for the first time

require 'fileutils'
require 'trollop'

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

def verbose(message)
	print "#{message}\n"
end

opts = Trollop::options do

	opt :hostname, "Set host name for backups",
	  :type => :string

	opt :destination, "Backup destination (i.e. user@host:/path)", 
	  :type => :string

end

@destination = opts[:destination]
@hostname = opts[:hostname]

_dummy, @destination_user, @destination_host, colon, @destination_path = 
  /^(.*)?(?:@)([^:]+)(:)(.*)?$/.match(@destination).to_a

error("Must be a remote path") unless colon
if !@hostname
	@hostname = `hostname -f`
	print "No hostname set, using #{@hostname}"
end

error "This host already appears set up - you need to delete /etc/byteback if not" if
  File.readable?("/etc/byteback/key")

FileUtils.mkdir_p("/etc/byteback")

error "Couldn't generate SSH key" unless 
  system("ssh-keygen -q -t rsa -C \"byteback client key\" -N \"\" -f /etc/byteback/key")

key_pub = File.read("/etc/byteback/key.pub")

error "Setup didn't work" unless
  system("ssh -i /etc/byteback/key -l #{@destination_user} #{@destination_host} byteback-setup-client-receive #{@hostname} #{key_pub}")

File.open("/etc/byteback/destination", "w") { |f| f.print @destination }

print "Setup worked!  To take your first backup run: byteback-backup --verbose\n"