src: save exec path when initializing Environment

PR-URL: #28252
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: joyeecheung

src/env-inl.h

@@ -635,6 +635,10 @@ inline const std::vector<std::string>& Environment::exec_argv() {
   return exec_argv_;
 }
 
+inline const std::string& Environment::exec_path() const {
+  return exec_path_;
+}
+
 #if HAVE_INSPECTOR
 inline void Environment::set_coverage_directory(const char* dir) {
   coverage_directory_ = std::string(dir);

src/env.cc

@@ -261,6 +261,32 @@ void Environment::CreateProperties() {
   set_process_object(process_object);
 }
 
+std::string GetExecPath(const std::vector<std::string>& argv) {
+  char exec_path_buf[2 * PATH_MAX];
+  size_t exec_path_len = sizeof(exec_path_buf);
+  std::string exec_path;
+  if (uv_exepath(exec_path_buf, &exec_path_len) == 0) {
+    exec_path = std::string(exec_path_buf, exec_path_len);
+  } else {
+    exec_path = argv[0];
+  }
+
+  // On OpenBSD process.execPath will be relative unless we
+  // get the full path before process.execPath is used.
+#if defined(__OpenBSD__)
+  uv_fs_t req;
+  req.ptr = nullptr;
+  if (0 ==
+      uv_fs_realpath(env->event_loop(), &req, exec_path.c_str(), nullptr)) {
+    CHECK_NOT_NULL(req.ptr);
+    exec_path = std::string(static_cast<char*>(req.ptr));
+  }
+  uv_fs_req_cleanup(&req);
+#endif
+
+  return exec_path;
+}
+
 Environment::Environment(IsolateData* isolate_data,
                          Local<Context> context,
                          const std::vector<std::string>& args,
@@ -274,6 +300,7 @@ Environment::Environment(IsolateData* isolate_data,
       timer_base_(uv_now(isolate_data->event_loop())),
       exec_argv_(exec_args),
       argv_(args),
+      exec_path_(GetExecPath(args)),
       should_abort_on_uncaught_toggle_(isolate_, 1),
       stream_base_state_(isolate_, StreamBase::kNumStreamBaseStateFields),
       flags_(flags),

src/env.h

@@ -850,6 +850,7 @@ class Environment : public MemoryRetainer {
   void InitializeLibuv(bool start_profiler_idle_notifier);
   inline const std::vector<std::string>& exec_argv();
   inline const std::vector<std::string>& argv();
+  const std::string& exec_path() const;
 
   typedef void (*HandleCleanupCb)(Environment* env,
                                   uv_handle_t* handle,
@@ -1239,6 +1240,7 @@ class Environment : public MemoryRetainer {
   std::shared_ptr<HostPort> inspector_host_port_;
   std::vector<std::string> exec_argv_;
   std::vector<std::string> argv_;
+  std::string exec_path_;
 
   uint32_t module_id_counter_ = 0;
   uint32_t script_id_counter_ = 0;

src/node_process_object.cc

@@ -180,37 +180,15 @@ void PatchProcessObject(const FunctionCallbackInfo<Value>& args) {
 #undef V
 
   // process.execPath
-  {
-    char exec_path_buf[2 * PATH_MAX];
-    size_t exec_path_len = sizeof(exec_path_buf);
-    std::string exec_path;
-    if (uv_exepath(exec_path_buf, &exec_path_len) == 0) {
-      exec_path = std::string(exec_path_buf, exec_path_len);
-    } else {
-      exec_path = env->argv()[0];
-    }
-    // On OpenBSD process.execPath will be relative unless we
-    // get the full path before process.execPath is used.
-#if defined(__OpenBSD__)
-    uv_fs_t req;
-    req.ptr = nullptr;
-    if (0 ==
-        uv_fs_realpath(env->event_loop(), &req, exec_path.c_str(), nullptr)) {
-      CHECK_NOT_NULL(req.ptr);
-      exec_path = std::string(static_cast<char*>(req.ptr));
-    }
-    uv_fs_req_cleanup(&req);
-#endif
-    process
-        ->Set(context,
-              FIXED_ONE_BYTE_STRING(isolate, "execPath"),
-              String::NewFromUtf8(isolate,
-                                  exec_path.c_str(),
-                                  NewStringType::kInternalized,
-                                  exec_path.size())
-                  .ToLocalChecked())
-        .Check();
-  }
+  process
+      ->Set(context,
+            FIXED_ONE_BYTE_STRING(isolate, "execPath"),
+            String::NewFromUtf8(isolate,
+                                env->exec_path().c_str(),
+                                NewStringType::kInternalized,
+                                env->exec_path().size())
+                .ToLocalChecked())
+      .Check();
 
   // process.debugPort
   CHECK(process