Re: Please review netcfg templates for debian-installer

Hi,

Pascal Hambourg <[email protected]> wrote (Sat, 3 Jan 2026 21:46:05 +0100):
> Hi,
> 
> On 03/01/2026 at 10:41, Holger Wansing wrote:
> > Am 2. Januar 2026 20:48:31 MEZ schrieb Justin B Rye <[email protected]>:
> >>
> >> hostname(7) implies a trailing hyphen *is* legal, and uppercase
> >> letters *aren't*!
> 
> hostname(7) does not prohibit a trailing hyphen, but it points to RFC 
> 1123 (Requirements for Internet Hosts -- Application and Support) which 
> points to RFC 952 which does not allow it:
> 
> <hname> ::= <name>*["."<name>]
> <name>  ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]
> 
> hostname(7) does not explicitly allow upper case letters but it mentions 
> case-insensitive match, which implies that case is irrelevant. RFC 952 
> and RFC 1034 (Domain Names - Concepts and Facilities) state that no 
> distinction is made between upper and lower case.

Ok

> > > @Pascal:
> > Seems there are different rules, when it comes to allowed characters and length of FQDN (63 vs. 253).
> > 
> > Any idea how to deal with that?
> 
> This started as a language review but I am afraid we opened a can of 
> worms...

Oh dear

> > In any case, the description should match the rules the code actually 
> enforces and vice versa. If we are not happy with current rules, I think 
> we should decide on new rules first, then fix the code and update the 
> templates accordingly.

Noone complained about the max length of the domain name apparently, so leave 
it as is and just edit the template, to match code?


We can also ask in a bigger audience, what people think, but I fear this 
might be a longer discussion, so I would be in favor of not holding this 
MR/template changes because of this, but leaving the code unchanged in
the first run.

Comments?


Holger