Only call ensure_params_path once (#21229)

* Only call ensore_params_path once

* only ensure default params path once

selfdrive/common/params.cc

@@ -78,7 +78,7 @@ int mkdir_p(std::string path) {
   return 0;
 }
 
-bool ensure_params_path(const std::string &param_path, const std::string &key_path) {
+static bool create_params_path(const std::string &param_path, const std::string &key_path) {
   // Make sure params path exists
   if (!util::file_exists(param_path) && mkdir_p(param_path) != 0) {
     return false;
@@ -117,6 +117,12 @@ bool ensure_params_path(const std::string &param_path, const std::string &key_pa
   return chmod(key_path.c_str(), 0777) == 0;
 }
 
+static void ensure_params_path(const std::string &params_path) {
+  if (!create_params_path(params_path, params_path + "/d")) {
+    throw std::runtime_error(util::string_format("Failed to ensure params path, errno=%d", errno));
+  }
+}
+
 class FileLock {
  public:
   FileLock(const std::string& file_name, int op) : fn_(file_name), op_(op) {}
@@ -225,9 +231,12 @@ std::unordered_map<std::string, uint32_t> keys = {
 
 Params::Params(bool persistent_param) : Params(persistent_param ? persistent_params_path : default_params_path) {}
 
+std::once_flag default_params_path_ensured;
 Params::Params(const std::string &path) : params_path(path) {
-  if (!ensure_params_path(params_path, params_path + "/d")) {
+  if (path == default_params_path) {
-    throw std::runtime_error(util::string_format("Failed to ensure params path, errno=%d", errno));
+    std::call_once(default_params_path_ensured, ensure_params_path, path);
+  } else {
+    ensure_params_path(path);
   }
 }