GitHub Webhook Deployment handler

deploy.php

<?php
header("Content-Type: text/plain");

// Decode the payload
$payload = json_decode( $_POST );

# Include config file if found
@include( __DIR__ . '/deploy-config.php' );

// Ability to choose a custom branch to track / deploy from, in the webhook registered URL
// ie: http://staging.com/pull.php?branch=somecustomone
if ( empty( $branch ) ) {
	$branch = ! empty( $_REQUEST['branch'] ) ? $_REQUEST['branch'] : 'staging';
}

# check that this payload is sent to the branch we're targetting
$commit_branch = preg_match( '#refs/heads/(.*)#', $payload['ref'], $matches ) ? $matches[1] : null;
if ( $commit_branch !== $branch ) {
	die( 'Not pushed to the tracking branch.');
}

# execute before_deployment logic if found
function_exists( 'before_deployment' ) && before_deployment();

# update and checkout the repo tracked branch
passthru("exec 2>&1 && git checkout -f $branch && git pull");

# run db migrations if possible
passthru("exec 2>&1 && rake db:migrate");

# execute after_deployment logic if found
function_exists( 'after_deployment' ) && after_deployment();