Getting a successful build number into another build using renderables

example.py

class LastBuild(util.ComparableMixin):
    """
    This code isn't meant to be functional!

    It's really pseudo code for how i would the # of the last successful 
    build into a completely unrelated build - some digging around will
    be required.

    You are invited to explore the build.master API and see if there is
    a better way to iterate previous builds - look for getLastFinishedBuild.
    That object will have a getPreviousBuild which will let you walk
    builds looking for a success.
    """

    implements(IRenderable)

    def __init__(self, buildername, subst='%s'):
        self.buildername = buildername
        self.subst = subst

    def getRenderingFor(self, props):
        build = props.getBuild()
        builder_status = build.master.getBuilder(self.buildername)
        for num in xrange(1,40):
            b = builder_status.getBuild(-num)
            if not b:
                continue
            if b.getResults() == SUCCESS:
                return self.subst % str(b.number)
        return "OH WELL"


# In your .cfg, you might use it like this:

ShellCommand(
    command = ['cp', LastBuild('buildername', "somedir/%s/tarball.tar.gz")],
    )

shell.py

class MyShellCommand(ShellCommand):

    def find_finished_build(self, buildername):
        builder_status = self.master.getBuilder(buildername)
        for num in xrange(1,40):
            b = builder_status.getBuild(-num)
            if not b:
                continue
            if b.getResults() == SUCCESS:
                return str(b.number)
        return "OH WELL"

    def start(self):
        self.setCommand(["cp", "/blah/%s/blah.tar.gz" % self.find_finished_build("myotherbuilder")])
        return ShellCommand.start(self)