74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
# Copyright 2016 Canonical Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import six
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from charmhelpers.core.hookenv import (
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log,
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DEBUG,
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WARNING,
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)
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try:
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from jinja2 import FileSystemLoader, Environment
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except ImportError:
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from charmhelpers.fetch import apt_install
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from charmhelpers.fetch import apt_update
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apt_update(fatal=True)
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if six.PY2:
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apt_install('python-jinja2', fatal=True)
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else:
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apt_install('python3-jinja2', fatal=True)
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from jinja2 import FileSystemLoader, Environment
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# NOTE: function separated from main rendering code to facilitate easier
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# mocking in unit tests.
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def write(path, data):
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with open(path, 'wb') as out:
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out.write(data)
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def get_template_path(template_dir, path):
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"""Returns the template file which would be used to render the path.
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The path to the template file is returned.
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:param template_dir: the directory the templates are located in
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:param path: the file path to be written to.
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:returns: path to the template file
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"""
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return os.path.join(template_dir, os.path.basename(path))
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def render_and_write(template_dir, path, context):
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"""Renders the specified template into the file.
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:param template_dir: the directory to load the template from
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:param path: the path to write the templated contents to
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:param context: the parameters to pass to the rendering engine
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"""
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env = Environment(loader=FileSystemLoader(template_dir))
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template_file = os.path.basename(path)
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template = env.get_template(template_file)
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log('Rendering from template: %s' % template.name, level=DEBUG)
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rendered_content = template.render(context)
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if not rendered_content:
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log("Render returned None - skipping '%s'" % path,
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level=WARNING)
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return
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write(path, rendered_content.encode('utf-8').strip())
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log('Wrote template %s' % path, level=DEBUG)
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