KACL from KIO isn't really POSIX-compliant

[Aleix Pol]

On Wed, Dec 2, 2020 at 10:47 AM Gleb Popov <6yearold at gmail.com> wrote:
>
> Hello everyone.
>
> I tried compiling kio/src/core/kacl.cpp on FreeBSD, which does support POSIX ACLs, and failed. This is because KACL's code uses non-standard Linux-specific acl_* functions. I tried implementing them using standard ones and it turned out to be impossible, mainly because types like acl_t are opaque to the user of the library.
>
> For instance, there is no standard acl_get_perm() function and it is impossible to implement it without getting into acl_permset_t.
>
> Now I'm a bit unsure how to solve this. I can implement non-standard functions in FreeBSD's libc without touching KACL code, or I can rewrite the KACL class to be truly POSIX-compliant. The latter seems to be a better idea on the first look, but it'd require keeping track of all the permission flags set (again, because there is no acl_get_perm()) inside. This will turn KACL class from being a tiny acl_* wrapper into a beefy chunk of code, but at least we won't lie that it is POSIX-compliant.
>
> Any thoughts?
>
> P.S. Please CC me, as I'm not subscribed.

Adding Adriaan who has been working on KDE+FreeBSD things.

Aleix