How to use the koji.pathinfo.rpm function in koji

def get_pkg_urls(self, pkg, arch=None):
        '''
        Gets the urls for the packages specified in pkg

        @type pkg: KojiPkgSpec
        @param pkg: a package specification
        @type arch: string
        @param arch: packages built for this architecture, but also including
                architecture independent (noarch) packages
        '''
        info = self.get_pkg_info(pkg)
        rpms = self.get_pkg_rpm_info(pkg, arch)
        rpm_urls = []
        for rpm in rpms:
            rpm_name = koji.pathinfo.rpm(rpm)
            url = ("%s/%s/%s/%s/%s" % (self.config_options['pkgurl'],
                                       info['package_name'],
                                       info['version'], info['release'],
                                       rpm_name))
            rpm_urls.append(url)
        return rpm_urls

'''
        Gets the urls for the packages specified in pkg

        :type pkg: KojiPkgSpec
        :param pkg: a package specification
        :type arch: string
        :param arch: packages built for this architecture, but also including
                architecture independent (noarch) packages
        '''
        info = self.get_pkg_info(pkg)
        rpms = self.get_pkg_rpm_info(pkg, arch)
        rpm_urls = []
        base_url = self.get_pkg_base_url()

        for rpm in rpms:
            rpm_name = koji.pathinfo.rpm(rpm)
            url = ("%s/%s/%s/%s/%s" % (base_url,
                                       info['package_name'],
                                       info['version'], info['release'],
                                       rpm_name))
            rpm_urls.append(url)
        return rpm_urls

def get_pkg_rpm_file_names(self, pkg, arch=None):
        """
        Gets the file names for the RPM packages specified in pkg

        :type pkg: KojiPkgSpec
        :param pkg: a package specification
        :type arch: string
        :param arch: packages built for this architecture, but also including
                architecture independent (noarch) packages
        """
        if arch is None:
            arch = os.uname()[4]
        rpm_names = []
        rpms = self.get_pkg_rpm_info(pkg, arch)
        for rpm in rpms:
            arch_rpm_name = koji.pathinfo.rpm(rpm)
            rpm_name = os.path.basename(arch_rpm_name)
            rpm_names.append(rpm_name)
        return rpm_names

def get_pkg_rpm_file_names(self, pkg, arch=None):
        '''
        Gets the file names for the RPM packages specified in pkg

        :type pkg: KojiPkgSpec
        :param pkg: a package specification
        :type arch: string
        :param arch: packages built for this architecture, but also including
                architecture independent (noarch) packages
        '''
        if arch is None:
            arch = utils.get_arch()
        rpm_names = []
        rpms = self.get_pkg_rpm_info(pkg, arch)
        for rpm in rpms:
            arch_rpm_name = koji.pathinfo.rpm(rpm)
            rpm_name = os.path.basename(arch_rpm_name)
            rpm_names.append(rpm_name)
        return rpm_names

"""
        Gets the urls for the packages specified in pkg

        :type pkg: KojiPkgSpec
        :param pkg: a package specification
        :type arch: string
        :param arch: packages built for this architecture, but also including
                architecture independent (noarch) packages
        """
        info = self.get_pkg_info(pkg)
        rpms = self.get_pkg_rpm_info(pkg, arch)
        rpm_urls = []
        base_url = self.get_pkg_base_url()

        for rpm in rpms:
            rpm_name = koji.pathinfo.rpm(rpm)
            url = ("%s/%s/%s/%s/%s" % (base_url,
                                       info['package_name'],
                                       info['version'], info['release'],
                                       rpm_name))
            rpm_urls.append(url)
        return rpm_urls

def get_pkg_rpm_file_names(self, pkg, arch=None):
        '''
        Gets the file names for the RPM packages specified in pkg

        @type pkg: KojiPkgSpec
        @param pkg: a package specification
        @type arch: string
        @param arch: packages built for this architecture, but also including
                architecture independent (noarch) packages
        '''
        if arch is None:
            arch = utils.get_arch()
        rpm_names = []
        rpms = self.get_pkg_rpm_info(pkg, arch)
        for rpm in rpms:
            arch_rpm_name = koji.pathinfo.rpm(rpm)
            rpm_name = os.path.basename(arch_rpm_name)
            rpm_names.append(rpm_name)
        return rpm_names

def rpm_path(self, rpminfo):
        build = rpminfo['build']
        return os.path.join(koji.pathinfo.build(build), koji.pathinfo.rpm(rpminfo))