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plugins.html.md: Update docs example to match code example. 

`plugin.RegisterBuilder` doesn't seem to exist. Instead the [example](https://github.com/hashicorp/packer/blob/master/plugin/example/main.go) and the tests use `plugin.Server`.
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Graham King 2019-07-24 20:46:37 -07:00 committed by GitHub
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website/source/docs/extending/plugins.html.md
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@ -130,8 +130,7 @@ There are two steps involved in creating a plugin:
plugin, implement the `packer.Builder` interface.
2. Serve the interface by calling the appropriate plugin serving method in
your main method. In the case of a builder, this is
`plugin.RegisterBuilder`.
your main method.
A basic example is shown below. In this example, assume the `Builder` struct
implements the `packer.Builder` interface:
@ -145,11 +144,16 @@ import (
type Builder struct{}
func main() {
plugin.RegisterBuilder(new(Builder))
server, err := plugin.Server()
if err != nil {
panic(err)
}
server.RegisterBuilder(new(Builder))
server.Serve()
}
```
**That's it!** `plugin.RegisterBuilder` handles all the nitty gritty of
**That's it!** `plugin.Server` handles all the nitty gritty of
communicating with Packer core and serving your builder over RPC. It can't get
much easier than that.