493e57c195
If the userdata starts with the text '## template:jinja', Jinja2 templating engine will be used to render that userdata. This feature leverages the get_instance_data metadata service implementation and tries to be as close as possible with the cloud-init's implementation. Change-Id: I79cb0066f7d65ae27867ac01b443e9be432b4dc3
38 lines
1.4 KiB
Python
38 lines
1.4 KiB
Python
# Copyright 2019 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from cloudbaseinit.utils import classloader
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from oslo_log import log as oslo_logging
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TEMPLATE_ENGINE_CLASS_PATHS = ["cloudbaseinit.utils.template_engine"
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".jinja2_template.Jinja2TemplateEngine"]
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LOG = oslo_logging.getLogger(__name__)
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def get_template_engine(user_data):
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"""Returns the first template engine that loads correctly"""
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cl = classloader.ClassLoader()
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for class_path in TEMPLATE_ENGINE_CLASS_PATHS:
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tpl_engine = cl.load_class(class_path)()
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try:
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if tpl_engine.load(user_data):
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LOG.info("Using template engine: %s"
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% tpl_engine.get_template_type())
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return tpl_engine
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except Exception as ex:
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LOG.error("Failed to load template engine '%s'" % class_path)
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LOG.exception(ex)
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return
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