Return a list of architectures for this task.

        :returns: a list of arch strings (eg ["ppc64le", "x86_64"]). The list
                  is empty if this task has no arches associated with it.

def arches(self):
        """
        Return a list of architectures for this task.

        :returns: a list of arch strings (eg ["ppc64le", "x86_64"]). The list
                  is empty if this task has no arches associated with it.
        """
        if self.method == 'image':
            return self.params[2]
        if self.arch:
            return [self.arch]
        return []