/* Get a sort of unique machine identifier. Prefer the MAC address; if that fails, fall back to the hostname; if that fails, pick something. */
static std::string get_machine_identifier(void)
{
std::string result;
unsigned char mac_addr[MAC_ADDRESS_MAX_LEN] = {};
if (get_mac_address(mac_addr))
{
result.reserve(2 * MAC_ADDRESS_MAX_LEN);
for (size_t i=0; i < MAC_ADDRESS_MAX_LEN; i++)
{
char buff[3];
snprintf(buff, sizeof buff, "%02x", mac_addr[i]);
result.append(buff);
}
}
else if (get_hostname_identifier(&result))
{
/* Hooray */
}
else
{
/* Fallback */
result.assign("nohost");
}
return result;
}
static bool load_or_save_variables(bool save)
{
const wcstring wdir = fishd_get_config();
const std::string dir = wcs2string(wdir);
if (dir.empty())
return false;
const std::string machine_id = get_machine_identifier();
const std::string machine_id_path = get_variables_file_path(dir, machine_id);
bool success = load_or_save_variables_at_path(save, machine_id_path);
if (! success && ! save && errno == ENOENT)
{
/* We failed to load, because the file was not found. Older fish used the hostname only. Try *moving* the filename based on the hostname into place; if that succeeds try again. Silently "upgraded." */
std::string hostname_id;
if (get_hostname_identifier(&hostname_id) && hostname_id != machine_id)
{
std::string hostname_path = get_variables_file_path(dir, hostname_id);
if (0 == rename(hostname_path.c_str(), machine_id_path.c_str()))
{
/* We renamed - try again */
success = load_or_save_variables_at_path(save, machine_id_path);
}
}
}
return success;
}
bool env_universal_t::load()
{
scoped_lock locker(lock);
callback_data_list_t callbacks;
const wcstring vars_path = explicit_vars_path.empty() ? default_vars_path() : explicit_vars_path;
bool success = load_from_path(vars_path, &callbacks);
if (! success && ! tried_renaming && errno == ENOENT)
{
/* We failed to load, because the file was not found. Older fish used the hostname only. Try *moving* the filename based on the hostname into place; if that succeeds try again. Silently "upgraded." */
tried_renaming = true;
std::string hostname_id;
if (get_hostname_identifier(&hostname_id))
{
const wcstring hostname_path = wdirname(vars_path) + L'/' + str2wcstring(hostname_id);
if (0 == wrename(hostname_path, vars_path))
{
/* We renamed - try again */
success = this->load();
}
}
}
return success;
}
