[tor-bugs] #31309 [Core Tor/Tor]: Add envvar to pass options to practracker

[Tor Bug Tracker & Wiki]

#31309: Add envvar to pass options to practracker
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     Reporter:  nickm    |      Owner:  nickm
         Type:  defect   |     Status:  assigned
     Priority:  Medium   |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  practracker, tech-debt,
     Severity:  Normal   |  refactoring, easy, 041-deferred-20190530,
                         |  network-team-roadmap-july
Actual Points:           |  Parent ID:  #29746
       Points:  .1       |   Reviewer:
      Sponsor:           |
  Sponsor31-can          |
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 On #30752, catalyst notes:
 >The Makefile should provide a way to pass command line options in to
 practracker from the environment, so CI won't have to run practracker by
 bypassing the Makefile. This can be useful if we want to run with less-
 friendly options during cron builds, for example.

 I agree.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31309>
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