class UbuntuPPASourcePackage(UbuntuSourcePackage):
    "Download / unpack an PPA source package"
    def __init__(self, ppa_spec, *args, **kwargs):
        super(UbuntuPPASourcePackage, self).__init__(*args, **kwargs)
        _, ppa = ppa_spec.split(':')
        self._ppa_owner, self._ppa_name = ppa.split('/', 1)
        #self.masters = [ "http://ubuntu-cloud.archive.canonical.com/ubuntu/" ]

    def _lp_url(self, filename):
        "Build a source package URL on Launchpad"
        return os.path.join('https://launchpad.net', "~%s" % self._ppa_owner,
                            '+archive', 'ubuntu', self._ppa_name,
                            '+files', filename)

    @property
    def lp_spph(self):
        "Return the LP Source Package Publishing History entry"
        if not self._spph:
            launchpad = launchpad_login()
            possible_people = launchpad.people.findPerson(text=self._ppa_owner)
            for person in possible_people:
                if person.name == self._ppa_owner:
                    self._ppa_owner = person
                    break
            spph = (self._ppa_owner.getPPAByName(name=self._ppa_name)
                          .getPublishedSources(
                              source_name=self.source,
                              version=self.version.full_version,
                              exact_match=True,
                          ))
            print(spph)
            self._spph = SourcePackagePublishingHistory(spph[0])
        return self._spph