[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):

 Replying to [comment:4 boklm]:
 > Replying to [comment:2 yawning]:
 > >  * 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.
 >
 > Yes, it is not possible to detect it from the update metadata. You can
 detect it by looking at the file `Browser/defaults/pref/channel-prefs.js`.
 The switch will be done with a mar file updating this file and the
 `Browser/update-settings.ini` file only.

 On a somewhat tangential note, it would be nice if the architecture,
 channel, and locale for the currently installed bundle was stored in a
 consistent location across all releases, in a format that is easy to parse
 (and no, "Javascript Mozilla prefs" is not easy to parse).

 > The update modifying the channel preferences files should apply
 correctly, but assuming the sandbox updater is not looking at those files
 to know the current channel, nothing else will happen and users will stay
 on the last hardened version.

 Ah ok.  That may be less bad than "everything breaks".

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21912#comment:5>
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