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Current File : /usr/lib/python2.7/site-packages/cloudinit/cmd/devel/render.py

# This file is part of cloud-init. See LICENSE file for license information.

"""Debug jinja template rendering of user-data."""

import argparse
import os
import sys

from cloudinit.handlers.jinja_template import render_jinja_payload_from_file
from cloudinit import log
from cloudinit.sources import INSTANCE_JSON_FILE, INSTANCE_JSON_SENSITIVE_FILE
from . import addLogHandlerCLI, read_cfg_paths

NAME = 'render'

LOG = log.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. Defaults to'
              ' /run/cloud-init/instance-data.json'))
    parser.add_argument('-d', '--debug', action='store_true', default=False,
                        help='Add verbose messages during template render')
    return parser


def handle_args(name, args):
    """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.
    """
    addLogHandlerCLI(LOG, log.DEBUG if args.debug else log.WARNING)
    if args.instance_data:
        instance_data_fn = args.instance_data
    else:
        paths = read_cfg_paths()
        uid = os.getuid()
        redacted_data_fn = os.path.join(paths.run_dir, INSTANCE_JSON_FILE)
        if uid == 0:
            instance_data_fn = os.path.join(
                paths.run_dir, INSTANCE_JSON_SENSITIVE_FILE)
            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(args.user_data) as stream:
            user_data = stream.read()
    except IOError:
        LOG.error('Missing user-data file: %s', args.user_data)
        return 1
    try:
        rendered_payload = render_jinja_payload_from_file(
            payload=user_data, payload_fn=args.user_data,
            instance_data_file=instance_data_fn,
            debug=True if args.debug else False)
    except RuntimeError as e:
        LOG.error('Cannot render from instance data: %s', str(e))
        return 1
    if not rendered_payload:
        LOG.error('Unable to render user-data file: %s', args.user_data)
        return 1
    sys.stdout.write(rendered_payload)
    return 0


def main():
    args = get_parser().parse_args()
    return(handle_args(NAME, args))


if __name__ == '__main__':
    sys.exit(main())


# vi: ts=4 expandtab

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