[tor-bugs] #29882 [Core Tor/Tor]: Make practracker produce output in a stable order

[Tor Bug Tracker & Wiki]

#29882: Make practracker produce output in a stable order
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     Reporter:  teor     |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |
     Severity:  Normal   |   Keywords:  042-must, tor-merge-scripts, tor-ci
Actual Points:           |  Parent ID:  #29880
       Points:           |   Reviewer:
      Sponsor:           |
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 It looks like practracker produces different output based on the OS
 directory traversal order.

 Two directories on my macOS machine produce the same file, but with a
 different line order to the one in git. See the resulting commit here:
 https://github.com/torproject/tor/pull/837/commits/973451edd1a8f0fe7c07ae5ba7fe8256ef279f95

 If we want to automate practracker, we'll need to use a stable sort order
 for warnings.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29882>
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