diff options
Diffstat (limited to 'cloudinit/handlers/jinja_template.py')
| -rw-r--r-- | cloudinit/handlers/jinja_template.py | 48 |
1 files changed, 40 insertions, 8 deletions
diff --git a/cloudinit/handlers/jinja_template.py b/cloudinit/handlers/jinja_template.py index 5033abbb..de88a5ea 100644 --- a/cloudinit/handlers/jinja_template.py +++ b/cloudinit/handlers/jinja_template.py @@ -1,14 +1,18 @@ # This file is part of cloud-init. See LICENSE file for license information. +import copy from errno import EACCES import os import re +from typing import Optional try: from jinja2.exceptions import UndefinedError as JUndefinedError + from jinja2.lexer import operator_re except ImportError: # No jinja2 dependency JUndefinedError = Exception + operator_re = re.compile(r'[-.]') from cloudinit import handlers from cloudinit import log as logging @@ -97,7 +101,9 @@ def render_jinja_payload_from_file( def render_jinja_payload(payload, payload_fn, instance_data, debug=False): instance_jinja_vars = convert_jinja_instance_data( instance_data, - decode_paths=instance_data.get('base64-encoded-keys', [])) + decode_paths=instance_data.get('base64-encoded-keys', []), + include_key_aliases=True + ) if debug: LOG.debug('Converted jinja variables\n%s', json_dumps(instance_jinja_vars)) @@ -118,7 +124,30 @@ def render_jinja_payload(payload, payload_fn, instance_data, debug=False): return rendered_payload -def convert_jinja_instance_data(data, prefix='', sep='/', decode_paths=()): +def get_jinja_variable_alias(orig_name: str) -> Optional[str]: + """Return a jinja variable alias, replacing any operators with underscores. + + Provide underscore-delimited key aliases to simplify dot-notation + attribute references for keys which contain operators "." or "-". + This provides for simpler short-hand jinja attribute notation + allowing one to avoid quoting keys which contain operators. + {{ ds.v1_0.config.user_network_config }} instead of + {{ ds['v1.0'].config["user.network-config"] }}. + + :param orig_name: String representing a jinja variable name to scrub/alias. + + :return: A string with any jinja operators replaced if needed. Otherwise, + none if no alias required. + """ + alias_name = re.sub(operator_re, '_', orig_name) + if alias_name != orig_name: + return alias_name + return None + + +def convert_jinja_instance_data( + data, prefix='', sep='/', decode_paths=(), include_key_aliases=False +): """Process instance-data.json dict for use in jinja templates. Replace hyphens with underscores for jinja templates and decode any @@ -127,21 +156,24 @@ def convert_jinja_instance_data(data, prefix='', sep='/', decode_paths=()): result = {} decode_paths = [path.replace('-', '_') for path in decode_paths] for key, value in sorted(data.items()): - if '-' in key: - # Standardize keys for use in #cloud-config/shell templates - key = key.replace('-', '_') key_path = '{0}{1}{2}'.format(prefix, sep, key) if prefix else key if key_path in decode_paths: value = b64d(value) if isinstance(value, dict): result[key] = convert_jinja_instance_data( - value, key_path, sep=sep, decode_paths=decode_paths) - if re.match(r'v\d+', key): + value, key_path, sep=sep, decode_paths=decode_paths, + include_key_aliases=include_key_aliases + ) + if re.match(r'v\d+$', key): # Copy values to top-level aliases for subkey, subvalue in result[key].items(): - result[subkey] = subvalue + result[subkey] = copy.deepcopy(subvalue) else: result[key] = value + if include_key_aliases: + alias_name = get_jinja_variable_alias(key) + if alias_name: + result[alias_name] = copy.deepcopy(result[key]) return result # vi: ts=4 expandtab |