builedbot-mail-issue

Steps to repro:
  
---------------
1. buildbot create-master temp-master
2. mv temp-master/temp-master.cfg.sample temp-master/master.cfg
3. Change so it looks like this (MailNotifier added)
---------------

# -*- python -*-
# ex: set syntax=python:

from buildbot.plugins import *

# This is a sample buildmaster config file. It must be installed as
# 'master.cfg' in your buildmaster's base directory.

# This is the dictionary that the buildmaster pays attention to. We also use
# a shorter alias to save typing.
c = BuildmasterConfig = {}

####### BUILDSLAVES

# The 'slaves' list defines the set of recognized buildslaves. Each element is
# a BuildSlave object, specifying a unique slave name and password.  The same
# slave name and password must be configured on the slave.
c['slaves'] = [buildslave.BuildSlave("example-slave", "pass")]

# 'protocols' contains information about protocols which master will use for
# communicating with slaves.
# You must define at least 'port' option that slaves could connect to your master
# with this protocol.
# 'port' must match the value configured into the buildslaves (with their
# --master option)
c['protocols'] = {'pb': {'port': 9989}}

####### CHANGESOURCES

# the 'change_source' setting tells the buildmaster how it should find out
# about source code changes.  Here we point to the buildbot clone of pyflakes.

c['change_source'] = []
c['change_source'].append(changes.GitPoller(
        'git://github.com/buildbot/pyflakes.git',
        workdir='gitpoller-workdir', branch='master',
        pollinterval=300))

####### SCHEDULERS

# Configure the Schedulers, which decide how to react to incoming changes.  In this
# case, just kick off a 'runtests' build

c['schedulers'] = []
c['schedulers'].append(schedulers.SingleBranchScheduler(
                            name="all",
                            change_filter=util.ChangeFilter(branch='master'),
                            treeStableTimer=None,
                            builderNames=["runtests"]))
c['schedulers'].append(schedulers.ForceScheduler(
                            name="force",
                            builderNames=["runtests"]))

####### BUILDERS

# The 'builders' list defines the Builders, which tell Buildbot how to perform a build:
# what steps, and which slaves can execute them.  Note that any particular build will
# only take place on one slave.

factory = util.BuildFactory()
# check out the source
factory.addStep(steps.Git(repourl='git://github.com/buildbot/pyflakes.git', mode='incremental'))
# run the tests (note that this will require that 'trial' is installed)
factory.addStep(steps.ShellCommand(command=["trial", "pyflakes"]))

c['builders'] = []
c['builders'].append(
    util.BuilderConfig(name="runtests",
      slavenames=["example-slave"],
      factory=factory))

####### STATUS TARGETS

# 'status' is a list of Status Targets. The results of each build will be
# pushed to these targets. buildbot/status/*.py has a variety to choose from,
# including web pages, email senders, and IRC bots.

from buildbot.plugins import status
m = status.MailNotifier(fromaddr="buildbot@localhost", extraRecipients=["[email protected]"], sendToInterestedUsers=False)

c['status'] = []
c['status'].append(m)

####### PROJECT IDENTITY

# the 'title' string will appear at the top of this buildbot
# installation's html.WebStatus home page (linked to the
# 'titleURL') and is embedded in the title of the waterfall HTML page.

c['title'] = "Pyflakes"
c['titleURL'] = "https://launchpad.net/pyflakes"

# the 'buildbotURL' string should point to the location where the buildbot's
# internal web server (usually the html.WebStatus page) is visible. This
# typically uses the port number set in the Waterfall 'status' entry, but
# with an externally-visible host name which the buildbot cannot figure out
# without some help.

c['buildbotURL'] = "http://localhost:8020/"

# minimalistic config to activate new web UI
c['www'] = dict(port=8020,
                plugins=dict(waterfall_view={}, console_view={}))

####### DB URL

c['db'] = {
    # This specifies what database buildbot uses to store its state.  You can leave
    # this at its default for all but the largest installations.
    'db_url' : "sqlite:///state.sqlite",
}

--------------------
4. buildbot start temp-master
--------------------
Following twistd.log until startup finished..
2015-02-05 08:09:16+0100 [-] Log opened.
2015-02-05 08:09:16+0100 [-] twistd 13.2.0 (/usr/bin/python 2.7.6) starting up.
2015-02-05 08:09:16+0100 [-] reactor class: twisted.internet.selectreactor.SelectReactor.
2015-02-05 08:09:16+0100 [-] Starting BuildMaster -- buildbot.version: 0.9.0
2015-02-05 08:09:16+0100 [-] Loading configuration from '/Users/emoon/code/temp-master/master.cfg'
2015-02-05 08:09:16+0100 [-] Setting up database with URL 'sqlite:/state.sqlite'
2015-02-05 08:09:16+0100 [-] setting database journal mode to 'wal'
2015-02-05 08:09:16+0100 [-] adding 1 new changesources, removing 0
2015-02-05 08:09:16+0100 [-] adding 1 new builders, removing 0
2015-02-05 08:09:16+0100 [-] gitpoller: using workdir '/Users/emoon/code/temp-master/gitpoller-workdir'
2015-02-05 08:09:16+0100 [-] trying to load status pickle from /Users/emoon/code/temp-master/runtests/builder
2015-02-05 08:09:16+0100 [-] added builder runtests with tags []
2015-02-05 08:09:16+0100 [-] adding scheduler 'all'
2015-02-05 08:09:16+0100 [-] adding scheduler 'force'
2015-02-05 08:09:16+0100 [-] initializing www plugin 'waterfall_view'
2015-02-05 08:09:16+0100 [-] initializing www plugin 'console_view'
2015-02-05 08:09:16+0100 [-] RotateLogSite starting on 8020
2015-02-05 08:09:16+0100 [-] Starting factory <buildbot.www.service.RotateLogSite instance at 0x102712560>
2015-02-05 08:09:16+0100 [-] Setting up http.log rotating 10 files of 10000000 bytes each
2015-02-05 08:09:16+0100 [-] while starting BuildMaster
	Traceback (most recent call last):
	  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py", line 1155, in gotResult
	    _inlineCallbacks(r, g, deferred)
	  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py", line 1099, in _inlineCallbacks
	    result = g.send(result)
	  File "/Library/Python/2.7/site-packages/buildbot-0.9.0-py2.7.egg/buildbot/util/service.py", line 43, in reconfigServiceWithBuildbotConfig
	    yield svc.reconfigServiceWithBuildbotConfig(new_config)
	  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py", line 1237, in unwindGenerator
	    return _inlineCallbacks(None, gen, Deferred())
	--- <exception caught here> ---
	  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py", line 1099, in _inlineCallbacks
	    result = g.send(result)
	  File "/Library/Python/2.7/site-packages/buildbot-0.9.0-py2.7.egg/buildbot/status/master.py", line 92, in reconfigServiceWithBuildbotConfig
	    yield sr.setServiceParent(self)
	  File "/Library/Python/2.7/site-packages/buildbot-0.9.0-py2.7.egg/buildbot/status/mail.py", line 469, in setServiceParent
	    self.master_status.subscribe(self)
	exceptions.AttributeError: 'NoneType' object has no attribute 'subscribe'
	
2015-02-05 08:09:16+0100 [-] BuildMaster is running
The buildmaster appears to have (re)started correctly.