[tor-bugs] #24839 [Core Tor/Tor]: Add a torrc option and descriptor line to opt-in as a FallbackDir

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#24839: Add a torrc option and descriptor line to opt-in as a FallbackDir
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 Reporter:  teor                                |          Owner:  (none)
     Type:  task                                |         Status:  new
 Priority:  Medium                              |      Milestone:  Tor:
                                                |  0.3.4.x-final
Component:  Core Tor/Tor                        |        Version:
 Severity:  Normal                              |     Resolution:
 Keywords:  needs-proposal, fallback, tor-spec  |  Actual Points:
Parent ID:  #24786                              |         Points:  3
 Reviewer:                                      |        Sponsor:
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Comment (by teor):

 We should check if the fallbacks have a DirPort and ContactInfo.
 A ContactInfo should be required on the relay and by the selection script.
 No DirPort should result in a warning on the relay.
 A DirPort should be required by the selection script until #19129 is
 implemented.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24839#comment:1>
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