Theo de Raadt <dera...@openbsd.org> wrote:
> Thomas Bohl <openbsd-misc-518...@aloof.de> wrote:
>
> > Hello,
> >
> > > I suppose there is some argument that we should support hostname.MAC
> > > files
> >
> > Maybe a function in netstart right before vifscreate could be enough
> > to achieve this? I creates this diff, against stable for now though,
> > as a test.
> >
> > Create a /etc/hostname.MAC file like you would create a
> > /etc/hostname.if file. (MAC = lladdr as shown with ifconfig. Like
> > /etc/hostname.08:00:27:14:26:0d)
> > /etc/netstart than creates a symbolic link to the corresponding
> > hostname.if. If there is a hostname.if file it is not overwritten. The
> > rest works the same.
> >
> >
> > --- netstart Tue Sep 27 19:39:43 2022
> > +++ netstart Tue Nov 22 03:39:49 2022
> > @@ -104,6 +104,21 @@ ifcreate() {
> > fi
> > }
> >
> > +# Symlink hostname.MAC to hostname.if.
> > +# Existing hostname.if-file (no symlink) wins.
> > +link_MAC_to_if() {
> > + local _hn _mac _if
> > +
> > + for _hn in /etc/hostname.??:??:??:??:??:??; do
> > + _mac=`echo $_hn | cut -c 15-31`
> > + _if=`ifconfig | grep -B 1 $_mac | head -n 1 | awk -F ": "
> > '{print $1}'`
Oh, except that using grep, head, or awk. That breaks NFS diskless
machines, because they are in /usr, which may not be mounted yet.
So this has to be done using shell features or commands in /bin and /sbin.
You will see these interesting hacks in other parts of rc and netstart.
