Incorrect usage is displayed when running nerdctl without any command

[narharim]

Description

Without any command passed to client, it's display [flags] instead of [command] in usage

Steps to reproduce the issue

1. Run go build . inside cmd/nerdctl
2. Run ./nerdctl

Describe the results you received and expected

Received Usage: nerdctl [flags]

Expected Usage: nerdctl [command]

What version of nerdctl are you using?

v2.0.0-rc.0

Are you using a variant of nerdctl? (e.g., Rancher Desktop)

None

Host information

No response

[narharim]

https://github.com/containerd/nerdctl/blob/bc24aa95d8b2b0b2342b88fbf97d1a44a961aac2/cmd/nerdctl/main.go#L55 I think this line should be replaced with if c != c.Root()

[narharim]

@AkihiroSuda I would like to raise a PR for this.

[fahedouch]

@AkihiroSuda I would like to raise a PR for this.

please go ahead!

[apostasie]

@narharim curious if you are still interested in working on this?