cron.js

'use strict';

var exec = require('child_process').exec;
var fs = require('fs');
var command = 'git pull origin master';
var projectPath = __dirname;
var errorLogPath = __dirname + '/logs/error.log';
var mainLogPath = __dirname + '/logs/main.log';
// execute a git pull
var child = exec(command, {cwd: projectPath});
var buildSite = require(__dirname + '/src/builders/buildSite');
var successText;

function gitIsUpToDate(data) {
    return ((data.indexOf('Already up-to-date')) > -1);
}

function tryToBuild() {
    var time = new Date().toString();
    var text = time + ' - Build has been initiated!\n';

    fs.appendFile(mainLogPath, text, function(err) {
        var errorText = time + ' - Could not write to ' + mainLogPath + ' file\n';
        if (err) {
            fs.appendFileSync(errorLogPath, errorText);
        }
    });
    buildSite();
}
// grab stdout
child.stdout.on('data', function(data) {
    successText = data;
});
// log error
child.stderr.on('data', function(data) {
    var time = new Date().toString();
    var errorText = time + ' - Git stderr: \n   ' + data;

    fs.appendFileSync(errorLogPath, errorText);
});

// try to build the project on exit
child.on('close', function(code) {
    var time = new Date().toString();
    var text;
    // log exit code
    if (gitIsUpToDate(successText)) {
        text = time + ' - Git is up to date. Code: ' + code + '\n';
        fs.appendFileSync(errorLogPath, text);
    } else {
        tryToBuild();
    }
});