[users at bb.net] Unable to run builder

[Chris Spencer]

How do you configure a builder to run a specific script in your source?

I have a "runtests" script in my code which creates the Python virtualenv,
creates an in-memory test database, and runs all unittests, but when I
enter a builder command like "cd src/myproject; runtests", I get the error:

    Upon execvpe cd src/myproject; ./runtests ['cd src/myproject;
./runtests'] in environment id 140610380051352
    :Traceback (most recent call last):
      File "/usr/lib/python2.7/dist-packages/twisted/internet/process.py",
line 403, in _fork
        path, uid, gid, executable, args, environment)
      File "/usr/lib/python2.7/dist-packages/twisted/internet/process.py",
line 453, in _execChild
        os.execvpe(executable, args, environment)
      File "/usr/lib/python2.7/os.py", line 353, in execvpe
        _execvpe(file, args, env)
      File "/usr/lib/python2.7/os.py", line 368, in _execvpe
        func(file, *argrest)
    OSError: [Errno 2] No such file or directory

presumably because Buildbot's default CWD is not the same as my code's
clone directory.

The tutorial (http://docs.buildbot.net/current/tutorial/tour.html) is a
little confusing. It calls "trial pyflakes", which is a globally-accessible
command, so it's not clear how Buildbot knows where anything is. How do I
construct my command to reference Buildbot's CWD and the location where it
checks-out my code?

My master.cfg looks like:

    c['change_source'] = []
    c['change_source'].append(changes.GitPoller(
            'https://myuser:mypass@bitbucket.org/myproject/myproject.git',
            workdir='gitpoller-workdir',
            branch='master',
            pollinterval=300, # interval in seconds between polls
    ))

    ####### SCHEDULERS

    c['schedulers'] = []
    c['schedulers'].append(schedulers.SingleBranchScheduler(
        name="all",
        change_filter=util.ChangeFilter(branch='master'),
        #The scheduler will wait for this many seconds before starting the
build.
        treeStableTimer=None,
        builderNames=["myproject_runtests"],
    ))
    c['schedulers'].append(schedulers.ForceScheduler(
        name="force",
        builderNames=["myproject_runtests"]))

    ####### BUILDERS

    factory = util.BuildFactory()
    factory.addStep(steps.Git(repourl='
https://myuser:mypass@bitbucket.org/myproject/myproject.git',
mode='incremental'))
    factory.addStep(steps.ShellCommand(command=["cd src/myproject;
./runtests"]))

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