server.js

var connect = require('connect')
  , exec = require('child_process').execFile

var app = connect()
.use(connect.json())
.use(function(req, res) {
        if (!!~ req.body.ref.indexOf('gh-pages'))
                return res.end("OK");

        console.log("DEPLOYING...")

        exec('/root/app/deploy.sh', function(err, stdout, stderr) {
                if (!err) {
                        console.log("<success>")
                        res.statusCode = 200
                        return res.end('OK')
                }

                err.stderr = stderr
                console.log("<ERROR>", JSON.stringify(err))
                res.statusCode = 500
                res.end(JSON.stringify(err))
        })
})

console.log("Listening on port 80...")
app.listen(80)