params: support OPENPILOT_PREFIX (#24495)

* prefix params

* set env

* prefix in manager

* filesystem except

* dont delete manager folder

* Update selfdrive/common/params.h

Co-authored-by: Adeeb Shihadeh <adeebshihadeh@gmail.com>

* debug same path

* remove cleanup + same default

* dont use filesystem lib

* param symlink path

* path

* spelling

Co-authored-by: Adeeb Shihadeh <adeebshihadeh@gmail.com>

selfdrive/common/params.cc

@@ -60,9 +60,9 @@ bool create_params_path(const std::string &param_path, const std::string &key_pa
   return true;
 }
 
-std::string ensure_params_path(const std::string &path = {}) {
+std::string ensure_params_path(const std::string &prefix, const std::string &path = {}) {
   std::string params_path = path.empty() ? Path::params() : path;
-  if (!create_params_path(params_path, params_path + "/d")) {
+  if (!create_params_path(params_path, params_path + prefix)) {
     throw std::runtime_error(util::string_format("Failed to ensure params path, errno=%d", errno));
   }
   return params_path;
@@ -180,9 +180,12 @@ std::unordered_map<std::string, uint32_t> keys = {
 
 } // namespace
 
+
 Params::Params(const std::string &path) {
-  static std::string default_param_path = ensure_params_path();
-  params_path = path.empty() ? default_param_path : ensure_params_path(path);
+  const char* env = std::getenv("OPENPILOT_PREFIX");
+  prefix = env ? "/" + std::string(env) : "/d";
+  std::string default_param_path = ensure_params_path(prefix);
+  params_path = path.empty() ? default_param_path : ensure_params_path(prefix, path);
 }
 
 bool Params::checkKey(const std::string &key) {

selfdrive/common/params.h

@@ -18,7 +18,7 @@ public:
   bool checkKey(const std::string &key);
   ParamKeyType getKeyType(const std::string &key);
   inline std::string getParamPath(const std::string &key = {}) {
-    return key.empty() ? params_path + "/d" : params_path + "/d/" + key;
+    return params_path + prefix + (key.empty() ? "" : "/" + key);
   }
 
   // Delete a value
@@ -43,4 +43,5 @@ public:
 
 private:
   std::string params_path;
+  std::string prefix;
 };