synchronously run system command in nodejs <= 0.10.x

processExecSync.js

/*jslint
    maxerr: 8,
    maxlen: 96,
    node: true,
    stupid: true
*/
(function () {
    'use strict';

    function processExecSync(command, options) {
        /*
            this function emulates child_process.execSync for legacy node <= 0.10.x
            derived from https://github.com/gvarsanyi/sync-exec/blob/master/js/sync-exec.js
        */
        var child, error, fs, timeout, tmpdir;
        // init fs
        fs = require('fs');
        // init options
        options = options || {};
        // init timeout
        timeout = Date.now() + options.timeout;
        // init tmpdir
        tmpdir = '/tmp/processExecSync.' + Date.now() + Math.random();
        fs.mkdirSync(tmpdir);
        // init command
        command = '(' + command + ' > ' + tmpdir + '/stdout 2> ' + tmpdir +
            '/stderr); echo $? > ' + tmpdir + '/status';
        // init child
        child = require('child_process').exec(command, options, function () {
            return;
        });
        while (true) {
            try {
                fs.readFileSync(tmpdir + '/status');
                break;
            } catch (ignore) {
            }
            if (Date.now() > timeout) {
                error = child;
                break;
            }
        }
        ['stdout', 'stderr', 'status'].forEach(function (file) {
            child[file] = fs.readFileSync(tmpdir + '/' + file, options.encoding);
            fs.unlinkSync(tmpdir + '/' + file);
        });
        child.status = Number(child.status);
        if (child.status !== 0) {
            error = child;
        }
        try {
            fs.rmdirSync(tmpdir);
        } catch (ignore) {
        }
        if (error) {
            throw error;
        }
        return child.stdout;
    }

    console.log(String(processExecSync('sleep 1 && echo "hello"')));
    // hello
}());