[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):

 Instead of displaying an ugly dialog box, I wrote code to
 opportunistically use `libnotify` to inform the user that an update is
 available.  This integrates better into most desktop environments, and is
 what other applications do.

 `libnotify` was chosen because I'd rather deal with cgo than refactor the
 launcher around glib's `GApplication` (or the Gtk counterpart).  The cost
 is another build time dependency, and a runtime optional dependency (the
 binding I wrote uses `dlopen()/dlsym()`), but the library is on my
 Debian/Fedora VMs so I suspect it's fairly ubiquitous, and the code will
 fall back to the ugly dialog box if required.

 TODO: Notifications can have actions, so add an action to restart.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20778#comment:13>
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