[tor-bugs] #31851 [Core Tor/Tor]: Implement some more optional modules in Tor

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#31851: Implement some more optional modules in Tor
-------------------------------+--------------------------------
     Reporter:  teor           |      Owner:  teor
         Type:  task           |     Status:  assigned
     Priority:  Medium         |  Milestone:  Tor: 0.4.3.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-design
Actual Points:                 |  Parent ID:
       Points:  5              |   Reviewer:  nickm
      Sponsor:  Sponsor31-can  |
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 Let's make some more optional modules.

 Our target set of modules might include:
 * dirauth - the code only used by directory authorities (including bridge
 authorities)
 * dircache - the code only used by directory caches and directory
 authorities
 * relay - the code only used by relays and directory authorities
 * common - the code used by all roles

 I'll do a design, and a proposed CI build strategy, and then get it
 reviewed.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31851>
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