Description

Currently the engine ID shown in docker info is the fingerprint ID used to sign the deprecated manifest schema v1. The key signature and finger on these manifests are not checked or used any longer for security, deprecated by notary. So, given this context, we could:

1. Generate ephemeral fingerprint keys to push the v1 manifests
2. Replace the current engine ID with an UUID generated once

Suggested format

Location: <docker_storage_directory>/engine_uuid

/var/lib/docker # cat engine_uuid
0df9fdce-f163-41f0-92bb-d0df29dd79bc
/var/lib/docker #

/cc @dmp42 @friism