mkosi $command --help should not run the actual command

[davide125]

mkosi commit the issue has been seen with

main

Used host distribution

Fedora Linux 41

Used target distribution

Fedora Linux 41

Linux kernel version used

No response

CPU architectures issue was seen on

None

Unexpected behaviour you saw

When inside a mkosi config, running mkosi burn --help will immediately attempt to burn, instead of printing something. Likewise for mkosi qemu --help or any other similar invocation.

Used mkosi config

No response

mkosi output

With a valid config:

$ mkosi burn --help
‣ Burning 🔥🔥🔥 to medium…

Without a valid config:

$ mkosi burn --help
‣ Image 'default' has not been built yet
‣ (Make sure to build the image first with 'mkosi build' or use '--force')

[behrmann]

That's unfortunately an artifact of how our commandline parsing works, since mkosi options come before verbs everything after the verb is an option for that verb if the verb takes a cmdline.

We should probably specialcase that for our verbs that don't take arguments and support -h/--help there, to alleviate that footgun.