updater.js

// During automated QA of the updater, modify this file to set testingUpdater to
// true. This will make it act as if it is at version 0.1.0 and use test URLs
// for update checks.
var testingUpdater = false;

var inFiber = require('./fiber-helpers.js').inFiber;
var files = require('./files.js');
var warehouse = require('./warehouse.js');

var manifestUrl = testingUpdater
      ? 'https://s3.amazonaws.com/com.meteor.static/test/update/manifest.json'
      : 'https://update.meteor.com/manifest.json';

/**
 * Downloads the current manifest file and returns it via a callback (or
 * null on error)
 */
exports.getManifest = function () {
  return files.getUrl({url: manifestUrl, json: true});
};

exports.startUpdateChecks = function (context) {
  var updateCheck = inFiber(function () {
    var manifest = null;
    try {
      manifest = exports.getManifest();
    } catch (e) {
      // Ignore error (eg, offline), but still do the "can we update this app
      // with a locally available release" check.
    }

    if (!files.usesWarehouse())
      return;

    // XXX in the future support release channels other than stable
    var manifestLatestRelease =
          manifest && manifest.releases && manifest.releases.stable &&
          manifest.releases.stable.version;
    var localLatestRelease = warehouse.latestRelease();
    if (manifestLatestRelease && manifestLatestRelease !== localLatestRelease) {
      // The manifest is telling us about a release that isn't our latest
      // release! First, print a banner... but only if we've never printed a
      // banner for this release before. (Or, well... only if this release isn't
      // the last release which has had a banner printed.)
      if (manifest.releases.stable.banner &&
          warehouse.lastPrintedBannerRelease() !== manifestLatestRelease) {
        console.log();
        console.log(manifest.releases.stable.banner);
        console.log();
        warehouse.writeLastPrintedBannerRelease(manifestLatestRelease);
      } else {
        // Already printed this banner, or maybe there is no banner.
        console.log("=> Meteor %s is being downloaded in the background.",
                    manifestLatestRelease);
      }
      try {
        warehouse.fetchLatestRelease(true /* background */);
      } catch (e) {
        // oh well, this was the background. no need to show any errors.
        return;
      }
      // We should now have fetched the latest release, which *probably* is
      // manifestLatestRelease. As long as it's changed from the one it was
      // before we tried to fetch it, print that out.
      var newLatestRelease = warehouse.latestRelease();
      if (newLatestRelease !== localLatestRelease) {
        console.log(
          "=> Meteor %s is available. Update this project with 'meteor update'.",
          newLatestRelease);
      }
      return;
    }

    // We didn't do a global update (or we're not online), but do we need to
    // update this app? Specifically: is our local latest release something
    // other than this app's release, and the user didn't specify a specific
    // release at the command line with --release?
    if (localLatestRelease !== context.releaseVersion &&
        !context.userReleaseOverride) {
        console.log(
          "=> Meteor %s is available. Update this project with 'meteor update'.",
          localLatestRelease);
    }
  });
  setInterval(updateCheck, 12*60*60*1000); // twice a day
  updateCheck(); // and now.
};