[tor-bugs] #20539 [Core Tor/Tor]: Make sure fallback directories deliver a recent consensus

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#20539: Make sure fallback directories deliver a recent consensus
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 Reporter:  teor          |          Owner:
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.2.9.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  fallback      |  Actual Points:
Parent ID:  #18828        |         Points:  0.5
 Reviewer:                |        Sponsor:
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Comment (by teor):

 There are a few separate issues here:
 1. We don't want to ever add any fallback directories running the buggy
 versions,
 2. We don't want to ever add any fallback directories that can't deliver a
 recent consensus, regardless of version, and
 3. We want to remove any fallback directories that do either of the above
 things.

 If we modify the fallback selection script to check 1 and 2, 3 will happen
 automatically when we next rebuild the list (or when we remove failed
 fallbacks from the existing list).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20539#comment:2>
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