gh_hook.php

<?php

//error_reporting(E_ALL);
ignore_user_abort(true);

function syscall ($cmd, $cwd) {
	$descriptorspec = array(
		1 => array('pipe', 'w') // stdout is a pipe that the child will write to
	);
	$resource = proc_open($cmd, $descriptorspec, $pipes, $cwd);
	if (is_resource($resource)) {
		$output = stream_get_contents($pipes[1]);
		fclose($pipes[1]);
		proc_close($resource);
		return $output;
	}
}

// GitHub will hit us with POST (http://help.github.com/post-receive-hooks/)
if (!empty($_POST['payload'])) {
	
	// pull from master
	$result = syscall('git pull', '/var/www/example.com');

	// send us the output
	mail('team@example.com', 'GitHub hook `git pull` result', $result);

	// clear APC
	if (apc_clear_cache('opcode') == false) {
		mail('root', 'Unable to apc_clear_cache()', '');
	}
	
}

?>