`run --help` advertises `--rom dir=...` but the API rejects it with "Missing member 'image'"

[garysassano]

Environment

• Unikraft CLI 0.4.2 (linux/amd64)
• Metro: fra

Summary

The CLI's own help text offers a directory form for --rom. Using exactly that form fails with a 400 from the API.

Steps to reproduce

unikraft run --help prints, verbatim:

      --rom
          Attach ROM.
          [examples: image=myuser/my-rom:latest,at=/rom0,name=my-rom, dir=./mydata,at=/rom]

Using the advertised dir= form:

$ unikraft run --metro fra --name x --image python:3.13-alpine \
    --rom dir=./kernel,at=/rom -p 443:8080/http+tls -m 512MiB

error: failed on "fra" client: request failed: 400 Bad Request
request error: Missing member 'image' in auxiliary ROM description

Expected

Either the dir= form works and packages the directory, or it is removed from the help examples.

Actual

The help promises a form the backend will not accept.

Impact

Minor on its own, but dir= looks like exactly the escape hatch for injecting a small file without a full image build, so it is an attractive thing to reach for. I lost time assuming I had the syntax wrong.