[tor-bugs] #14847 [Tor]: Controller: add a command to fetch HS descriptor from HSdir(s)

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#14847: Controller: add a command to fetch HS descriptor from HSdir(s)
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     Reporter:  dgoulet      |      Owner:  dgoulet
         Type:  enhancement  |     Status:  needs_review
     Priority:  normal       |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor          |    Version:
   Resolution:               |   Keywords:  SponsorR tor-hs controller
Actual Points:               |  Parent ID:  #3521
       Points:               |
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Comment (by dgoulet):

 Ok, that was much more difficult than I anticipated and I expect quite a
 bit of rounds of review. Below are both the latest control-spec patch and
 little-t tor code. Make sure to read the commit message, they will be
 useful :).

 See branch `ticket14847_08` in
 ​​​​https://git.torproject.org/user/dgoulet/torspec.git
 Code: branch `bug14847_027_02` in my personal repo.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14847#comment:23>
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