Define how to enable/disable and configure plugins

[ncdc]

For example, some users might not want to enable the plugins that automatically walk from pod to pvc to pv.

[ncdc]

Let's say we want to enable/disable and configure the "foo.com/pod" BackupItemAction. Possible options:

• Create a ConfigMap in the heptio-ark namespace, the name can be whatever:

apiVersion: v1
kind: ConfigMap
metadata:
  name: foo-com-pod-config
  labels:
    ark.heptio.com/plugin-config: foo.com/pod
data:
  enabled: false
  addAnnotations:
    color: green
    size: small

Let's say we just want to disable a plugin that has no configuration:

• add --enable-plugins NAME(s) and/or --disable-plugins NAME(s) flags to the ark server
• use ConfigMaps and Ark is responsible for checking for an enable/disable annotation:

apiVersion: v1
kind: ConfigMap
metadata:
  name: foo-com-pod-config
  labels:
    ark.heptio.com/plugin-config: foo.com/pod
    ark.heptio.com/plugin-enabled: false

Proposed approach:

1. Admin uses --enable-plugins and/or --disable-plugins flag for the ark server to control which plugins are enabled
2. Admin and/or users can create ConfigMaps to configure their plugins, assuming plugins support configuration

[carlisia]

Un-assigned myself since I'm not currently working on this.