[tor-bugs] #20778 [Applications/Tor Browser Sandbox]: Check and download updates in the background.

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#20778: Check and download updates in the background.
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 Reporter:  yawning                           |          Owner:  yawning
     Type:  enhancement                       |         Status:  accepted
 Priority:  High                              |      Milestone:
Component:  Applications/Tor Browser Sandbox  |        Version:
 Severity:  Normal                            |     Resolution:
 Keywords:  Yawning201612                     |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Comment (by yawning):

 Under this model update checks will:
  * Still be done solely by querying the XML thingies, instead of
 `versioncheck_url` (I *could* fetch that and discard the results on a
 timer, but that seems wasteful and stupid).
  * Occur:
    * At launch if the browser is known to be out of date (ie: The user
 exited instead of restarting to apply the update, after a check indicated
 that updates are available).
    * At launch if it has been > 2 hours past the last check.
    * Every 2 hours past the launch in the background.
    * If requested by the user via the torbutton menu item.

 This is fairly close (barring the check URL being different), to existing
 behavior, except:
  * I use a timer, torbutton triggers off "new tab" and "new window".
  * I'll always wait 2 hours before hitting up the update server after
 launching firefox, torbutton can end up checking earlier (I could do the
 time math, if it's utterly important).

 Assuming no one convinces me otherwise my plan moving forward is roughly:
  1. Do the `sandboxed-tor-browser` non-UI modifications required to
 support basic integration.
  2. Write the torbutton changes.
  3. (Maybe) Add support for downloading the MAR in the background (I might
 punt on this till a future version due to time/funding constraints).
  4. Do the `sandboxed-tor-browser` UI modifications, basically adding a
 dialog box to the background update checker.
  5. Change the behavior for old bundles that lack update integration to
 something other than "annoy the user with a modal dialog box every 5
 mins".

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20778#comment:11>
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