Still looking where is the source code.
From docker plugin install rclone/docker-volume-rclone I would assume that it is a reference to a github repo.
But https://github.com/orgs/rclone/docker-volume-rclone does not seem to exist or be accessible.
Is this a private repo ? What did I miss ?
Managed plugin is in fact a special container running in a namespace separate from normal docker containers. Inside it runs the rclone serve docker command.
The config and cache directories are bind-mounted into the container at start. The docker daemon connects to a unix socket created by the command inside the container. The command creates on-demand remote mounts right inside, then docker machinery propagates them through kernel mount namespaces and bind-mounts into requesting user containers.