[tor-bugs] #20352 [Applications/Tor Browser]: Integrate sandboxed Tor Browser into our gitian build system

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#20352: Integrate sandboxed Tor Browser into our gitian build system
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-gitian, tbb-sandboxing,          |  Actual Points:
  GeorgKoppen201611, TorBrowserTeam201611R       |
Parent ID:  #19750                               |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by boklm):

 I attached a patch for `builders/gitian-builder.git` which updates
 `libexec/stop-target` to use `poweroff` instead of `halt`.

 It seems that in previous versions of Debian/Ubuntu, `halt` and `poweroff`
 were equivalent, but it is no longer the case in Debian Jessie (maybe
 after the switch to systemd) where `halt` shuts down all services but does
 not turn off power (which results in the qemu process not exiting). Using
 the `poweroff` command instead of `halt` should fix that.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20352#comment:19>
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