Robots.txt redirect for aegir site-specific robots.txt

###
### Redirect requests for /robots.txt
### First we check for existance of site-specific robots.txt
### If none, we redirect to default drupal robots.
###
location = /robots.txt {
  access_log    off;
  log_not_found off;
  try_files /sites/$server_name/robots.txt @robots;
}

location @robots {
  access_log    off;
  log_not_found off;
  try_files /robots.txt @cache;
}