[tor-bugs] #31502 [Core Tor/Tor]: Revise authority and fallback code so that they use the same "defaults" logic as other code

[Tor Bug Tracker & Wiki]

#31502: Revise authority and fallback code so that they use the same "defaults"
logic as other code
-------------------------------+--------------------------------
     Reporter:  nickm          |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #29211
       Points:                 |   Reviewer:
      Sponsor:  Sponsor31-can  |
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 For ages we've let "NULL" be the default set of authorities, and then
 added code to substitute "NULL" with the actual authorities.

 Same with fallback directories.

 We should fix that so that the real defaults are the "actual" defaults
 from the POV of what counts as default in the code.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31502>
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