Add live restore to Info struct

[aboch]

This allows some validation during swarm init (see moby/moby#23524 for details) and would allow the --live-restore option to be shown in the docker info o/p.

Signed-off-by: Alessandro Boch [email protected]

[mavenugo]

LGTM

[icecrime]

Thanks @aboch. I don't think the field needs to be in a public API for the daemon to take a decision accordingly. Can you please let me know if we don't have any other choice?

So far, not LGTM from my point of view.

[aboch]

@icecrime Current compatibility validation for the swarm command is being done in the cluster pkg as a cluster method. Wanted to keep the validation in the same place. I am not sure of another smple option. Will check.

[icecrime]

I'm thinking that:

• executor.Backend could have an additional fun IsSwarmCompatible() bool function
• The daemon can look into its internals (--cluster-store, --live-restore, or anything else really) to reply accordingly.

[aboch]

Thanks for the suggestion @icecrime . Let me see if I can get it working.

[aboch]

Thanks @icecrime I made the change and verified it works.
See https://github.com/docker/docker/pull/23524/files#diff-9cb7240401da846ac7c2252759538e9aR168

I think this PR can be closed, and new method addition review can happen in the docker/docker PR.

[icecrime]

Nice! Thanks