Folks, In the 6.0 release we'll support simple plugins for Fuel. The current architecture allows to create only very simple plugins and doesn't allow to "pluginize" complex features like Ceph, vCenter, etc. I'd like to propose some changes to make it possible. They are subtle enough and the plugin template still can be autogenerated by Fuel Plugin Builder. Here they are:
https://github.com/vkramskikh/fuel-plugins/commit/1ddb166731fc4bf614f502b276eb136687cb20cf 1. environment_config.yaml should contain exact config which will be mixed into cluster_attributes. No need to implicitly generate any controls like it is done now. 2. metadata.yaml should also contain "is_removable" field. This field is needed to determine whether it is possible to remove installed plugin. It is impossible to remove plugins in the current implementation. This field should contain an expression written in our DSL which we already use in a few places. The LBaaS plugin also uses it to hide the checkbox if Neutron is not used, so even simple plugins like this need to utilize it. This field can also be autogenerated, for more complex plugins plugin writer needs to fix it manually. For example, for Ceph it could look like "settings:storage.volumes_ceph.value == false and settings:storage.images_ceph.value == false". 3. For every task in tasks.yaml there should be added new "condition" field with an expression which determines whether the task should be run. In the current implementation tasks are always run for specified roles. For example, vCenter plugin can have a few tasks with conditions like "settings:common.libvirt_type.value == 'vcenter'" or "settings:storage.volumes_vmdk.value == true". Also, AFAIU, similar approach will be used in implementation of Granular Deployment feature. These simple changes will allow to write much more complex plugins. What do you think? -- Vitaly Kramskikh, Software Engineer, Mirantis, Inc.
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