bug#51425: file-system: validate flags

[Ludovic Courtès]

Hi!

Jonathan Brielmaier <jonathan.brielmaier@web.de> skribis:

> Imagine the following file system definition in your config.scm:
>
> ```
> (file-system
>   (device (uuid "UUID-123"))
>   (flags '((create-mount-point? #t)))
>   (mount-point "/mnt")
>   (type "ext4")))
> ```
>
> When you reconfigure there will be no complain, but when you reboot your
> system wont boot.

I suppose it fails to boot because of a match error in
‘mount-flags->bit-mask’, right?

> The parameter to flags is nonsense, it should be something like:
> `read-only`. So mounting of the file system will fail...

That’s a good use case for the recently-added ‘sanitize’ record field
property.

Ludo’.