posix main: only try to generate symlinks if data path argument given

if not given, the dirs are either not needed (eg RPI) or assumed to
exist already

src/platforms/posix/main.cpp

@@ -358,12 +358,16 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
+	bool symlinks_needed = true;
+
 	if (positional_arg_count == 1) { //data path is optional
 		commands_file = data_path;
-		data_path = ".";
+		symlinks_needed = false;
+
+	} else {
+		cout << "data path: " << data_path << endl;
 	}
 
-	cout << "data path: " << data_path << endl;
 	cout << "commands file: " << commands_file << endl;
 
 	if (commands_file.size() < 1) {
@@ -377,32 +381,34 @@ int main(int argc, char **argv)
 	}
 
 	// create sym-links
-	vector<string> path_sym_links;
-	path_sym_links.push_back("ROMFS");
-	path_sym_links.push_back("posix-configs");
-	path_sym_links.push_back("test_data");
+	if (symlinks_needed) {
+		vector<string> path_sym_links;
+		path_sym_links.push_back("ROMFS");
+		path_sym_links.push_back("posix-configs");
+		path_sym_links.push_back("test_data");
 
-	for (int i = 0; i < path_sym_links.size(); i++) {
-		string path_sym_link = path_sym_links[i];
-		//cout << "path sym link: " << path_sym_link << endl;
-		string src_path = data_path + "/" + path_sym_link;
-		string dest_path =  pwd() + "/" +  path_sym_link;
+		for (int i = 0; i < path_sym_links.size(); i++) {
+			string path_sym_link = path_sym_links[i];
+			//cout << "path sym link: " << path_sym_link << endl;
+			string src_path = data_path + "/" + path_sym_link;
+			string dest_path =  pwd() + "/" +  path_sym_link;
 
-		PX4_DEBUG("Creating symlink %s -> %s", src_path.c_str(), dest_path.c_str());
+			PX4_DEBUG("Creating symlink %s -> %s", src_path.c_str(), dest_path.c_str());
 
-		if (dirExists(path_sym_link)) { continue; }
+			if (dirExists(path_sym_link)) { continue; }
 
-		// create sym-links
-		int ret = symlink(src_path.c_str(), dest_path.c_str());
+			// create sym-links
+			int ret = symlink(src_path.c_str(), dest_path.c_str());
 
-		if (ret != 0) {
-			PX4_ERR("Error creating symlink %s -> %s",
-				src_path.c_str(), dest_path.c_str());
-			return ret;
+			if (ret != 0) {
+				PX4_ERR("Error creating symlink %s -> %s",
+					src_path.c_str(), dest_path.c_str());
+				return ret;
 
-		} else {
-			PX4_DEBUG("Successfully created symlink %s -> %s",
-				  src_path.c_str(), dest_path.c_str());
+			} else {
+				PX4_DEBUG("Successfully created symlink %s -> %s",
+					  src_path.c_str(), dest_path.c_str());
+			}
 		}
 	}