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Viewing changes to hooks/charmhelpers/core/services/helpers.py

  • Committer: Corey Bryant
  • Date: 2015-08-18 17:34:34 UTC
  • Revision ID: corey.bryant@canonical.com-20150818173434-hp6flkiy622hjrsy
[corey.bryant,r=trivial] Sync charm-helpers to pick up Liberty support.

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hooks/charmhelpers/core/services/helpers.py
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import os
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import yaml
 
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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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    :param str target: The target to write the rendered template to
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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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    """
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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):
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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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    def __call__(self, manager, service_name, event_name):
 
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        pre_checksum = ''
 
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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 = {}
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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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        if self.on_change_action:
 
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            if pre_checksum == host.file_hash(self.target):
 
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                hookenv.log(
 
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                    'No change detected: {}'.format(self.target),
 
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                    hookenv.DEBUG)
 
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            else:
 
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                self.on_change_action()
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# Convenience aliases for templates