[tor-bugs] #21425 [Core Tor/Tor]: entry_list_is_constrained() should look at the guard_selection_t object

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#21425: entry_list_is_constrained() should look at the guard_selection_t object
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  guards
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 We use entry_list_is_constrained() in a few places to find out if our list
 of entry points is highly limited (e.g., to a few bridges or a few
 EntryNodes).  But it doesn't do that very well:  instead, it looks to see
 if EntryNodes is set or UseBridges is set.

 We have better ways: we should be looking at the size of the guard sample,
 or something.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21425>
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