Ramalama debug option shows traceback when no subcommand is passed.

[pghole]

I ran the following command and got the below response. I think it should just print till requires a subcommand and not the traceback, as it looks like the tool has crashed. Perhaps the intention is to show the traceback as it's in debug mode but this looks a confusing to users. Thoughts ?

pghole@pghole-thinkpadt14sgen2i:~/opensource_contribution/ramalama$ ramalama --debug
usage: ramalama [-h] [--container] [--debug] [--dryrun] [--engine ENGINE] [--image IMAGE] [--nocontainer] [--gpu] [--runtime {llama.cpp,vllm}] [--store STORE] [-v]
                {help,convert,containers,ps,info,list,ls,login,logout,pull,push,rm,run,serve,stop,version} ...
ramalama: requires a subcommand
Traceback (most recent call last):
  File "/usr/local/bin/ramalama", line 4, in <module>
    __import__('pkg_resources').run_script('ramalama==0.3.0', 'ramalama')
  File "/usr/lib/python3.12/site-packages/pkg_resources/__init__.py", line 720, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python3.12/site-packages/pkg_resources/__init__.py", line 1559, in run_script
    exec(code, namespace, namespace)
  File "/usr/local/lib/python3.12/site-packages/ramalama-0.3.0-py3.12.egg/EGG-INFO/scripts/ramalama", line 95, in <module>
    main(sys.argv[1:])
  File "/usr/local/lib/python3.12/site-packages/ramalama-0.3.0-py3.12.egg/EGG-INFO/scripts/ramalama", line 72, in main
    args.func(args)
    ^^^^^^^^^
AttributeError: 'Namespace' object has no attribute 'func'

[ericcurtin]

Best we should do here is make the error more clear.

ramalama --debug

is like running:

podman --debug

it doesn't really make much sense, but we should at least print the usage help in this case.

[pghole]

@ericcurtin Can I send a PR for this ? Should we print the entire help menu like podman or just printing ramalama: requires a subcommand should be fine (ramalama other commands are just printing this line) ?

[ericcurtin]

Of course you can @pghole 😄