[Buildbot] #3024: logfilewatcher is not synchronously finished at the end of the command

[Buildbot trac]

#3024: logfilewatcher is not synchronously finished at the end of the command
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Reporter:  tardyp  |       Owner:
    Type:  defect  |      Status:  new
Priority:  major   |   Milestone:  0.9.+
 Version:  0.8.9   |  Resolution:
Keywords:          |
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Comment (by tardyp):

 I'm not sure if this is clear. This is about logwatchers. not about stdio
 logs. The feature that watches file on the slave on a particular path, and
 report it. Do we really have build-in-steps that process such files. I
 only know of steps processing the stdio.

 Fixing on the slave is looking harder than expected, as code style of this
 file is from prehistoric twisted. i couldn't find the function that
 actually return a defered we could wait on.

 For master workaround, instead of waiting one second, I think a better
 option is to poll wait until the log is finished by the slave. poll is
 evil, but hardcoded sleeps are hell.
 Another option would be a DeferredSemaphore that is locked until the log
 is finished.

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Ticket URL: <http://trac.buildbot.net/ticket/3024#comment:5>
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