monitors a github repo/branch and pulls new code when it detects a change

updater.php

<?php
	/* 
	A small script to authenticate to github, check a repo/branch
	and pull the code if a new commit has been made. It also does
	an initial pull as soon as it's executed.
	
	Dead Simple, but it works.
	
	$: cd <your repo>
	$: php updater.php
	
	Then ignore it while you work and hit Ctrl+C to break when
	you're done or toss it into a background process and let it
	loop forever. Just be sure to start it from within your
	repo's base directory and that you run it as the same user
	who owns the repo.
	*/
	
	$username		= '';			// Your Github username
	$token			= '';			// Your Github API token
	$repository		= '';			// Your repository name
	$branch			= 'master';		// The branch you're checking
	$check			= 180; 			// Seconds between checks
	
	$prev_commit 	= ''; // Might as well leave it blank.
	$loop_forever = true; // And don't change this.
	while($loop_forever) {
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, 'https://github.com/api/v2/xml/commits/list/'.$username.'/'.$repository.'/'.$branch);
		curl_setopt($ch, CURLOPT_POSTFIELDS, 'login='.$username.'&token='.$token);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		$output = curl_exec($ch);
		curl_close($ch);
		
		$xml = simplexml_load_string($output);
		
		$last_commit = (string) $xml->commit[0]->id;
		if($last_commit == $prev_commit) {
			echo date('m-d-Y H:i:s').": No change...\n";
		} else {
			echo date('m-d-Y H:i:s').": Pulling: ".$last_commit."\n";
			exec('git pull -q origin '.$branch); 
			$prev_commit = $last_commit;
		}
		sleep($check);
	}
	date('m-d-Y H:i:s').": Exiting..."; // Probably never happen.
?>