Extension Type "File" execute scriptfile tag in manifest

Question

I have declared a XML manifest file for my extension of type file like this:

<?xml version="1.0" encoding="utf-8"?>
<extension type="file" version="2.5" method="upgrade">
    <name>os_mp</name>
...
...
    <scriptfile>script.php</scriptfile>
...
...
</extension>

The script file is like this:

defined('_JEXEC') or die;

class os_mpInstallerScript
{
    public function postflight($type, $parent)
    {
        echo '<h1>' . $type . '</h1>';

        var_dump($type);
        var_dump($parent);
    }
}

But the code of the scrip file doesn't seem to get executed.

Please advise!

Answer 1

Finally found the issue. I have miswritten the class name of the installer script

defined('_JEXEC') or die;

class os_mpInstallerScript
{
    public function postflight($type, $parent)
    {
        echo '<h1>' . $type . '</h1>';

        var_dump($type);
        var_dump($parent);
    }
}

To find the correct calss name that joomla installer expected, I debugged the setupScriptfile member function of JInstallerAdapter. The file is located at libraries/cms/installer/adapter