[tor-bugs] #21912 [Applications/Tor Browser Sandbox]: Deal with the deprecation of the `hardened` channel.

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#21912: Deal with the deprecation of the `hardened` channel.
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 Reporter:  yawning                           |          Owner:  yawning
     Type:  defect                            |         Status:  new
 Priority:  High                              |      Milestone:
Component:  Applications/Tor Browser Sandbox  |        Version:
 Severity:  Normal                            |     Resolution:
 Keywords:                                    |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Comment (by yawning):

 Given the complexity of migrating users seamlessly, I'm going to opt for a
 forced reinstall, unless someone manages to convince me otherwise.

 Rationale:
  * It's not immediately obvious to me how to detect that a channel switch
 has happened from the update metadata
 (https://wiki.mozilla.org/Software_Update:updates.xml_Format).  This also
 applies to the bundle locale.
  * The `sandboxed-tor-browser` update code was not, and is not written to
 take into account things like channels changing, or locales disappearing.
  * It's cleaner in the long run.

 I do not know what will happen when the existing `sandboxed-tor-browser`
 has a hardened bundle installed and it encounters the update at the
 deprecation point.  My suspicion is that the update has a good chance of
 applying, but it will then fail to detect `libasan.so` and drop the user
 back to the config screen repeatedly.

 There isn't anything I can do about this now, since code that's out there
 is code that's out there.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21912#comment:2>
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