moodledata/cache/core_component.php created with incorrect permission during fresh installation

Warning: sha1_file(/Users/aparup/mtools/moodleglobalsearchdata/cache/core_component.php): failed to open stream: Permission denied in /Users/aparup/Sites/moodleglobalsearch/lib/classes/component.php on line 132
Call Stack

1. Time Memory Function Location
   1 0.0013 405528 {main}

   ( ) ../install.php:0
   2 0.0880 16120256 mysqli_native_moodle_database->get_name( ) ../install.php:407
   3 0.0880 16120416 get_string( ) ../mysqli_native_moodle_database.php:288
   4 0.0904 16580160 core_string_manager->get_string( ) ../moodlelib.php:7617
   5 0.0905 16580768 core_string_manager->load_component_strings( ) ../moodlelib.php:6894
   6 0.0905 16581360 core_component::normalize_component( ) ../moodlelib.php:6736
   7 0.0905 16581432 core_component::init( ) ../component.php:643
   8 0.1018 16746592 sha1_file ( )

$ ls -al /Users/aparup/mtools/moodleglobalsearchdata/cache/core_component.php
---------- 1 aparup staff 38777 2 Jul 15:23 /Users/aparup/mtools/moodleglobalsearchdata/cache/core_component.php

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The problem is that installers do not set permissions properly, let's replicate the logic from lib/setup.php in core_component. (skodak)