[tor-bugs] #17576 [Tor]: Add torrc option to disable default fallback directories

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#17576: Add torrc option to disable default fallback directories
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 Reporter:  teor               |          Owner:
     Type:  enhancement        |         Status:  needs_revision
 Priority:  Medium             |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor                |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  TorCoreTeam201511  |  Actual Points:
Parent ID:  #15775             |         Points:
  Sponsor:                     |
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Comment (by teor):

 Replying to [comment:4 nickm]:
 > Looks great except one thing: the code in options_validate() that
 changes UseDefaultFallbackDirs is a bad idea, since that will cause later
 SAVECONF calls to write the new UseDefaultFallbackDirs value to disk even
 if the user didn't mean for it to change.
 >
 > ...
 >   * Always ignore UseDefaultFallbackDirs when FallbackDirs is set.

 This is what the code already does by checking `!options->FallbackDir &&
 options->UseDefaultFallbackDirs`. I changed options_validate so that it
 didn't change the value of UseDefaultFallbackDirs, and updated the info
 message.

 Please see my branch feature17576-UseDefaultFallbackDirs-v2.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17576#comment:5>
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