recipe.py 文件源码

def download(self):
        if self.url is None:
            info('Skipping {} download as no URL is set'.format(self.name))
            return

        url = self.versioned_url

        shprint(sh.mkdir, '-p', join(self.ctx.packages_path, self.name))

        with current_directory(join(self.ctx.packages_path, self.name)):
            filename = shprint(sh.basename, url).stdout[:-1].decode('utf-8')

            do_download = True

            marker_filename = '.mark-{}'.format(filename)
            if exists(filename) and isfile(filename):
                if not exists(marker_filename):
                    shprint(sh.rm, filename)
                elif self.md5sum:
                    current_md5 = md5sum(filename)
                    if current_md5 == self.md5sum:
                        debug('Checked md5sum: downloaded expected content!')
                        do_download = False
                    else:
                        info('Downloaded unexpected content...')
                        debug('* Generated md5sum: {}'.format(current_md5))
                        debug('* Expected md5sum: {}'.format(self.md5sum))

                else:
                    do_download = False
                    info('{} download already cached, skipping'
                         .format(self.name))

            # If we got this far, we will download
            if do_download:
                debug('Downloading {} from {}'.format(self.name, url))

                shprint(sh.rm, '-f', marker_filename)
                self.download_file(url, filename)
                shprint(sh.touch, marker_filename)

                if exists(filename) and isfile(filename) and self.md5sum:
                    current_md5 = md5sum(filename)
                    if self.md5sum is not None:
                        if current_md5 == self.md5sum:
                            debug('Checked md5sum: downloaded expected content!')
                        else:
                            info('Downloaded unexpected content...')
                            debug('* Generated md5sum: {}'.format(current_md5))
                            debug('* Expected md5sum: {}'.format(self.md5sum))
                            exit(1)