[tor-bugs] #15775 [Tor]: Add Fallback Directory List to add_default_fallback_dir_servers()

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#15775: Add Fallback Directory List to add_default_fallback_dir_servers()
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     Reporter:  teor         |      Owner:
         Type:  enhancement  |     Status:  needs_information
     Priority:  normal       |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor          |    Version:  Tor: 0.2.4.7-alpha
   Resolution:               |   Keywords:
Actual Points:               |  Parent ID:  #15228
       Points:               |
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Comment (by teor):

 Questions from #15774:

     Do we need to wait until a majority of clients update to versions with
 this change, controlled by a consensus parameter? (Otherwise, using any
 entry in the file itself would allow clients to effectively be partitioned
 from the rest of the network by their behaviour.)

     While I'm making a list, do we need to modify the existing proposal
 which describes fallback directories?

     Is this change proposed for 0.2.7?
     Or all currently supported releases?

     Do we need a new configuration option to give the location of the
 Fallback Directories file(s)?
     How should this interact with the existing FallbackDir option?
     I propose multiple files and options are all cumulative, but de-
 duplicated.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15775#comment:5>
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