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# 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())
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