Shipitfile example

shipitfile.js

var project_name = "YOUR_PROJECT_NAME",
    project_url = 'YOUR_GIT_URL',
    project_destination_server = 'USER@SERVER',
    project_destination_dir = '/PROJECT_DIRECTORY',
    webhookUri = "SLACK_TOKEN_URI",
    Slack = require('slack-node'),
    slack = new Slack(),
    notify = function(text) {
        slack.webhook({
            channel: "#notifications",
            username: "deployer",
            text: text
        }, function(err, response) {
            if (err) {
                console.error(err);
            }
        });
    };

slack.setWebHook(webhookUri);

module.exports = function(shipit) {
    require('shipit-deploy')(shipit);

    shipit.initConfig({
        default: {
            workspace: '/tmp/' + project_name,
            deployTo: project_destination_dir,
            repositoryUrl: project_url,
            ignores: ['.git'],
            keepReleases: 2,
            shallowClone: true
        },
        production: {
            servers: project_destination_server
        }
    });

    shipit.on("deploy", function() {
        shipit.log("deploy started!");
        notify(":pushpin: " + project_name + " *Deploying...*");
    });

    var run_tasks = function(tasks) {
        var cwd = shipit.releasePath,
            unfold_tasks = function() {
                if (tasks.length > 0) {
                    var task = "cd " + cwd + " && " + tasks.splice(0, 1)[0];
                    return function() {
                        shipit.remote(task, {
                            cwd: cwd
                        }, unfold_tasks(fns));
                    };
                } else {
                    return function() {
                        shipit.log("deploy finished!");
                        notify(":zap: " + project_name + " *Deployed!*");
                    };
                }
            };
        unfold_tasks()();
    };

    shipit.on("published", function() {
        run_tasks(["npm install", "git submodule init", "git submodule update", "git submodule foreach git pull origin master","systemctl restart service"]);
    });

    shipit.on("rollback", function() {
        shipit.log("rolling back changes!");
        notify(":zap: " + project_name + " *Rolling back...*");
    });

    shipit.on("err", function(err) {
        shipit.log("An error occurred!", err);
        notify(":boom: " + project_name + " *" + err.err + "*");
    });
};

'deploy:publish' errored after 487 ms
ReferenceError: fns is not defined

shall be "tasks" instead "fns", right?