[tor-bugs] #23454 [Applications/Tor Browser]: stderr is missing from build logs

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#23454: stderr is missing from build logs
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     Reporter:  boklm                |      Owner:  boklm
         Type:  defect               |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm,
     Severity:  Normal               |  TorBrowserTeam201709
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 In #23425 we redirected the output from `runc start` to `/dev/null` to
 avoid annoying messages saying "stdin: is not a tty". However this also
 removes stderr from build logs.

 It seems the command producing the `stdin: is not a tty` message is the
 `chown -R` command from `runc/remote_put`, so we should only remove stderr
 from that part while keeping it for the runc command running the build
 script.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23454>
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