[Buildbot-devel] Output to stdout, too?

Dobes Vandermeer dobesv at gmail.com
Fri Oct 28 01:07:21 UTC 2005

Here is an even better solution, just add this to buildbot.tac:

import sys
from twisted.python import log

And it'll correctly handle stacktraces, etc..

On 10/2/05, Brian Warner <warner-buildbot at lothar.com> wrote:
> > Is there any hope or dream of making buildbot also dump logs to stdout
> > as well as to the logfile?
> Hm. I'm not sure what is available under windows, but if it were under Unix
> then the approach I'd take is to run twistd by hand and add a '--logfile=-'
> argument, which will cause it to log to stdout *instead of* to a twistd.log
> file. Then I'd pipe that into something like /bin/tee to send it to both a
> file and to the console window.
> When you run 'buildbot start DIR' (under windows), internally it just moves
> to DIR and then runs:
>  twistd --no_save --logfile=twisted.log --python=buildbot.tac --reactor=win32
> So you could just change the --logfile argument and run that command
> yourself.
> Now, if you don't have something like 'tee' on windows, and you want to have
> that functionality implemented inside buildbot itself.. well, the approach
> I'd take there is to add some code to buildbot.tac that will register an
> extra log observer. (note that this is a Twisted thing, not a
> buildbot-specific thing, it's just that buildbot.tac is a convenient place to
> do the registration):
> ---- start buildbot.tac
> [existing setup code, which creates the 'application' instance]
> def printLogMessage(msgdict):
>     print msgdict['message']
> from twisted.python import log
> log.addObserver(printLogMessage)
> ---- end buildbot.tac
> (actually, printLogMessage should be a little bit more complicated than
> that.. look at twisted/python/log.py in FileLogObserver.emit to see what log
> observers are supposed to implement).
> By registering a second LogObserver, each log message will go to stdout as
> well as the file.
> If you're seeing problems with log rotation under windows, please consider
> filing a bug in the Twisted bug tracker, http://twistedmatrix.com/bugs/ ,
> since that's the best way to address this problem long-term.
> hope that helps,
>  -Brian

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