Execute a command and save the output to a file for inclusion in the
        report.

def get_cmd_output_now(self, exe, suggest_filename=None,
                           root_symlink=False, timeout=300, stderr=True,
                           chroot=True, runat=None, env=None,
                           binary=False, sizelimit=None, pred=None):
        """Execute a command and save the output to a file for inclusion in the
        report.
        """
        if not self.test_predicate(cmd=True, pred=pred):
            self._log_info("skipped cmd output '%s' due to predicate (%s)" %
                           (exe, self.get_predicate(cmd=True, pred=pred)))
            return None

        return self._get_cmd_output_now(exe, timeout=timeout, stderr=stderr,
                                        chroot=chroot, runat=runat,
                                        env=env, binary=binary,
                                        sizelimit=sizelimit)