[tor-bugs] #9957 [Tor]: Tor should consider stderr output of transport proxies

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#9957: Tor should consider stderr output of transport proxies
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     Reporter:  wfn     |      Owner:
         Type:  defect  |     Status:  needs_review
     Priority:  minor   |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  tor-pt
Actual Points:          |  Parent ID:
       Points:          |
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Comment (by asn):

 Replying to [comment:9 wfn]:
 > Replying to [comment:7 asn]:
 >
 >
 > > Patch looks plausible.
 > >
 > > Three comments:
 >
 > > Maybe we should just suggest people to look into INFO-level logs,
 since obfsproxy doesn't log to a file by default, and some times it
 doesn't have time to write a logfile when this error appears (in
 ImportErrors, etc.).
 >
 > I agree (that was indeed the original problem anyway.) Log message tells
 them that, maybe it should be more clear about it? But this notice is
 there.
 >

 I wanted to say that maybe we shouldn't even suggest people to look at
 obfsproxy's log, because that might confuse them (they probably don't know
 if obfsproxy is logging or where. and obfsproxy does not log by default).
 We should only suggest people to look at Tor's info log.

 What do you think?

 > >
 > > c) I wonder what PTs currently output to stderr. Maybe if we are
 serious about this, we should add another convention to `pt-spec.txt`
 asking PTs to not print stuff in stderr except if they have error messages
 that the user should see.
 >
 > Yeah, I was wondering if this could not cause any trouble in some
 other/future PTs. Adding an explicit clause makes sense. Also, it'd be
 nice to make sure all current PTs already stick to this practice
 (obfsproxy does, I guess.)

 Yeah, we should make sure of this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9957#comment:11>
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