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# Copyright 2014-2015 Canonical Limited.
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# This file is part of charm-helpers.
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# charm-helpers is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3 as
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# published by the Free Software Foundation.
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# charm-helpers is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public License
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# along with charm-helpers. If not, see <http://www.gnu.org/licenses/>.
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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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# http://www.apache.org/licenses/LICENSE-2.0
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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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from charmhelpers.core import hookenv
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from charmhelpers.core import host
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from charmhelpers.core import templating
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from charmhelpers.core.services.base import ManagerCallback
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:param str source: The template source file, relative to
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`$CHARM_DIR/templates`
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`$CHARM_DIR/templates`
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:param str target: The target to write the rendered template to
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:param str target: The target to write the rendered template to (or None)
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:param str owner: The owner of the rendered file
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:param str group: The group of the rendered file
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:param int perms: The permissions of the rendered file
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:param partial on_change_action: functools partial to be executed when
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rendered file changes
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:param jinja2 loader template_loader: A jinja2 template loader
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:return str: The rendered template
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def __init__(self, source, target,
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owner='root', group='root', perms=0o444):
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owner='root', group='root', perms=0o444,
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on_change_action=None, template_loader=None):
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self.source = source
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self.target = target
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self.owner = owner
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self.group = group
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self.perms = perms
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self.on_change_action = on_change_action
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self.template_loader = template_loader
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def __call__(self, manager, service_name, event_name):
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if self.on_change_action and os.path.isfile(self.target):
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pre_checksum = host.file_hash(self.target)
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service = manager.get_service(service_name)
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context = {'ctx': {}}
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for ctx in service.get('required_data', []):
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context.update(ctx)
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templating.render(self.source, self.target, context,
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self.owner, self.group, self.perms)
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context['ctx'].update(ctx)
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result = templating.render(self.source, self.target, context,
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self.owner, self.group, self.perms,
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template_loader=self.template_loader)
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if self.on_change_action:
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if pre_checksum == host.file_hash(self.target):
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'No change detected: {}'.format(self.target),
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self.on_change_action()
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# Convenience aliases for templates
added
removed
hooks/charmhelpers/core/services/helpers.py
