Function get_current_user

sql/sql_acl.cc:13535–13583

*/

LEX_USER *get_current_user(THD *thd, LEX_USER *user, bool lock)
{
  if (user->user.str == current_user.str)  // current_user
    return create_default_definer(thd, false);

  if (user->user.str == current_role.str)  // current_role
    return create_default_definer(thd, true);

  if (user->host.str == NULL) // Possibly a role
  {
    // to be reexecution friendly we have to make a copy
    LEX_USER *dup= (LEX_USER*) thd->memdup(user, sizeof(*user));
    if (!dup)
      return 0;

#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (has_auth(user, thd->lex))
    {
      dup->host= host_not_specified;
      return dup;
    }

    role_name_check_result result= check_role_name(&dup->user, true);
    if (result == ROLE_NAME_INVALID)
      return 0;
    if (result == ROLE_NAME_PUBLIC)
    {
      dup->host= empty_clex_str;
      return dup;
    }

    if (!initialized)
      return dup;

    if (lock)
      mysql_mutex_lock(&acl_cache->lock);
    if (find_acl_role(dup->user, false))
      dup->host= empty_clex_str;
    else
      dup->host= host_not_specified;
    if (lock)
      mysql_mutex_unlock(&acl_cache->lock);
#endif

    return dup;
  }

  return user;
}

struct ACL_internal_schema_registry_entry
{