[Buildbot] #3070: buildbot try hangs under Windows

[Buildbot trac]

#3070: buildbot try hangs under Windows
-------------------+-----------------------
Reporter:  VZ      |      Owner:
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  undecided
 Version:  0.8.9   |   Keywords:
-------------------+-----------------------
 I have buildbot 0.8.9-2 from Debian testing running under Linux and am
 trying to submit a patch for testing to it using `buildbot try` from
 Windows 7. Initially I used Cygwin Python and installed buildbot using pip
 there, but this didn't work at all:

 {{{
 # the options are specified in a config file and are presumably good
 # as they work when using buildbot try under Linux
 buildbot --verbose try
 2014-11-25 23:47:11+0100 [-] Log opened.
 2014-11-25 23:47:11+0100 [-] using 'ssh' connect method
 ... nothing any more ...
 }}}
 Even with `--dryrun`, nothing happens. A bit of debugging shows that it
 runs `git branch` but there is nothing after this, i.e. no file/network
 activity at all.

 Next I tried the with the native Python 2.7.8 (32 bit version), using
 `easy-install`. Things were slightly better with it: with `--dryrun`
 things seem to work as expected, i.e. I see the "job created" message,
 followed by the job description including the diff and "job has been
 delivered" at the end. However without `--dryrun` it hangs again. This
 time I see that it runs ssh and, if I hack `tryclient.py` to use `ssh -v`
 command, I can even see that it connects to the master successfully:
 {{{
 2014-11-26 00:14:24+0100 [-] Log opened.
 2014-11-26 00:14:24+0100 [-] using 'ssh' connect method
 2014-11-26 00:14:25+0100 [-] job created
 ...ssh output snipped ...
 2014-11-26 00:14:25+0100 [-] debug1: Sending command: buildbot tryserver
 --jobdir /var/lib/buildbot/master/jobdir
 }}}
 but nothing happens afterwards, there is no network traffic and the python
 process just loops inside select as far as I can see under the debugger.

 Finally, I tried the sources from git, but they exhibit the same
 behaviour.

 I have no idea what to do next, I tried following the code but got
 completely lost in the twisted callback logic (I love irony as much as
 anybody else but I do have to wonder if it's really such a great idea for
 a framework...). I would be very grateful for any pointers, TIA!

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Ticket URL: <http://trac.buildbot.net/ticket/3070>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation