src: fall back to env->exec_path() for default profile directory

When the current working directory is deleted, fall back to
exec_path as the default profile directory.

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

Author: joyeecheung

src/inspector_profiler.cc

@@ -320,17 +320,20 @@ void EndStartedProfilers(Environment* env) {
   }
 }
 
-std::string GetCwd() {
+std::string GetCwd(Environment* env) {
   char cwd[PATH_MAX_BYTES];
   size_t size = PATH_MAX_BYTES;
   int err = uv_cwd(cwd, &size);
-  // This can fail if the cwd is deleted.
-  // TODO(joyeecheung): store this in the Environment during Environment
-  // creation and fallback to exec_path and argv0, then we no longer need
-  // SetCoverageDirectory().
-  CHECK_EQ(err, 0);
-  CHECK_GT(size, 0);
-  return cwd;
+
+  if (err == 0) {
+    CHECK_GT(size, 0);
+    return cwd;
+  }
+
+  // This can fail if the cwd is deleted. In that case, fall back to
+  // exec_path.
+  const std::string& exec_path = env->exec_path();
+  return exec_path.substr(0, exec_path.find_last_of(kPathSeparator));
 }
 
 void StartProfilers(Environment* env) {
@@ -345,7 +348,7 @@ void StartProfilers(Environment* env) {
   if (env->options()->cpu_prof) {
     const std::string& dir = env->options()->cpu_prof_dir;
     env->set_cpu_prof_interval(env->options()->cpu_prof_interval);
-    env->set_cpu_prof_dir(dir.empty() ? GetCwd() : dir);
+    env->set_cpu_prof_dir(dir.empty() ? GetCwd(env) : dir);
     if (env->options()->cpu_prof_name.empty()) {
       DiagnosticFilename filename(env, "CPU", "cpuprofile");
       env->set_cpu_prof_name(*filename);
@@ -360,7 +363,7 @@ void StartProfilers(Environment* env) {
   if (env->options()->heap_prof) {
     const std::string& dir = env->options()->heap_prof_dir;
     env->set_heap_prof_interval(env->options()->heap_prof_interval);
-    env->set_heap_prof_dir(dir.empty() ? GetCwd() : dir);
+    env->set_heap_prof_dir(dir.empty() ? GetCwd(env) : dir);
     if (env->options()->heap_prof_name.empty()) {
       DiagnosticFilename filename(env, "Heap", "heapprofile");
       env->set_heap_prof_name(*filename);