Every daemon with an extension host opened an extra full-access API
socket at startup, even when no extension used the API.
The socket is now created when an extension first connects to the API.
The daemonapi client looks up the endpoint on its first connection, so
NewClient no longer takes a context.
The socket is served separately from the configured hosts, returns 503
until the daemon is ready, and closes after extensions shut down.
It is accessible only to the daemon user, or to Administrators and
LocalSystem on Windows.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
Extensions had no supported way to call the Engine API.
The configured hosts may be socket-activated or TLS-only TCP.
Add the org.mobyproject.extension.daemon.api.v0 point.
It returns the address of a private unix socket where the daemon serves
its regular API handler.
daemonapiv0.NewClient helper resolves the point and returns a
*client.Client.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
Paweł Gronowski