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Author SHA1 Message Date
Ian Campbell 609dcb9152 Documentation on writing a plugin 
Signed-off-by: Ian Campbell <ijc@docker.com>
 2019-01-30 13:45:26 +00:00
Ian Campbell 1c576e9043 Integrate CLI plugins into `docker info` 
Fairly straight forward. It became necessary to wrap `Plugin.Err` with a type
which implements `encoding.MarshalText` in order to have that field rendered
properly in the `docker info -f '{{json}}'` output.

Since I changed the type somewhat I also added a unit test for `formatInfo`.

Signed-off-by: Ian Campbell <ijc@docker.com>
 2019-01-30 13:45:26 +00:00
Ian Campbell e96240427f Add basic framework for writing a CLI plugin 
That is, the helper to be used from the plugin's `main`.

Also add a `helloworld` plugin example and build integration.

Signed-off-by: Ian Campbell <ijc@docker.com>
 2019-01-29 11:26:40 +00:00