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Edit: render.py
#!/usr/bin/env python3 # This file is part of cloud-init. See LICENSE file for license information. """Debug jinja template rendering of user-data.""" import argparse import logging import os import sys from cloudinit.cmd.devel import read_cfg_paths from cloudinit.handlers.jinja_template import ( JinjaLoadError, JinjaSyntaxParsingException, NotJinjaError, render_jinja_payload_from_file, ) NAME = "render" CLOUDINIT_RUN_DIR = read_cfg_paths().run_dir LOG = logging.getLogger(__name__) def get_parser(parser=None): """Build or extend and arg parser for jinja render utility. @param parser: Optional existing ArgumentParser instance representing the subcommand which will be extended to support the args of this utility. @returns: ArgumentParser with proper argument configuration. """ if not parser: parser = argparse.ArgumentParser(prog=NAME, description=__doc__) parser.add_argument( "user_data", type=str, help="Path to the user-data file to render" ) parser.add_argument( "-i", "--instance-data", type=str, help=( "Optional path to instance-data.json file. " f"Defaults to {CLOUDINIT_RUN_DIR}" ), ) parser.add_argument( "-d", "--debug", action="store_true", default=False, help="Add verbose messages during template render", ) return parser def render_template(user_data_path, instance_data_path=None, debug=False): """Render the provided user-data template file using instance-data values. Also setup CLI log handlers to report to stderr since this is a development utility which should be run by a human on the CLI. @return 0 on success, 1 on failure. """ if instance_data_path: instance_data_fn = instance_data_path else: paths = read_cfg_paths() uid = os.getuid() redacted_data_fn = paths.get_runpath("instance_data") if uid == 0: instance_data_fn = paths.get_runpath("instance_data_sensitive") if not os.path.exists(instance_data_fn): LOG.warning( "Missing root-readable %s. Using redacted %s instead.", instance_data_fn, redacted_data_fn, ) instance_data_fn = redacted_data_fn else: instance_data_fn = redacted_data_fn if not os.path.exists(instance_data_fn): LOG.error("Missing instance-data.json file: %s", instance_data_fn) return 1 try: with open(user_data_path) as stream: user_data = stream.read() except IOError: LOG.error("Missing user-data file: %s", user_data_path) return 1 try: rendered_payload = render_jinja_payload_from_file( payload=user_data, payload_fn=user_data_path, instance_data_file=instance_data_fn, debug=True if debug else False, ) except (JinjaLoadError, NotJinjaError) as e: LOG.error( "Cannot render from instance data due to exception: %s", repr(e) ) return 1 except JinjaSyntaxParsingException as e: LOG.error( "Failed to render templated user-data file '%s'. %s", user_data_path, str(e), ) return 1 if not rendered_payload: LOG.error("Unable to render user-data file: %s", user_data_path) return 1 sys.stdout.write(rendered_payload) return 0 def handle_args(_name, args): return render_template(args.user_data, args.instance_data, args.debug) if __name__ == "__main__": sys.exit(handle_args(NAME, get_parser().parse_args()))