oras discover should show a placeholder of artifactType if it's not presented in an index referrer #1108
Description
What is the version of your ORAS CLI
1.1.0
What would you like to be added?
Currently oras discover shows an empty node when artifactType if it's not presented in an index referrer, like
✗ oras discover -o tree localhost:5000/test:multi
localhost:7000/command/artifacts@sha256:e2bfc9cc6a84ec2d7365b5a28c6bc5806b7fa581c9ad7883be955a64e3cc034f
├── referrer/index
│ └── sha256:d37baf66300b9006b0f4c7102075d56b970fbf910be5c6bca07fdbb000dfa383
└──
└── sha256:7679bc22c33b87aa345c6950a993db98a6df7a6cc77a35c388908a3Should use a placeholder for the empty artifactType, like <nil> since fmt.Println(nil) prints <nil>
✗ oras discover -o tree localhost:5000/test:multi
localhost:7000/command/artifacts@sha256:e2bfc9cc6a84ec2d7365b5a28c6bc5806b7fa581c9ad7883be955a64e3cc034f
├── referrer/index
│ └── sha256:d37baf66300b9006b0f4c7102075d56b970fbf910be5c6bca07fdbb000dfa383
└── <nil>
└── sha256:7679bc22c33b87aa345c6950a993db98a6df7a6cc77a35c388908a3Why is this needed for ORAS?
Showing an empty node makes no sense and will confuse our user.
Are you willing to submit PRs to contribute to this feature?
- Yes, I am willing to implement it.