woked - yay.

dhcp-host=00:26:9e:03:9d:e5,set:negk,negk
dhcp-option-force=tag:negk,209,"partman-auto/disk=/dev/sda"

# grub/grub.cfg
net_get_dhcp_option appends ${net_default_interface} 209 string

menuentry "Install Ubuntu preseed" {
set gfxpayload=keep
linux /ubuntu-installer/amd64/linux gfxpayload=800x600x16,800x600 ---
auto=true url=dc10b DEBCONF_DEBUG=5 tasks="" hostname=
interface=${net_default_mac} ${appends}
initrd /ubuntu-installer/amd64/initrd.gz
}

~ # head /var/log/syslog
May  1 04:30:40 kernel: [    0.000000] Command line:
BOOT_IMAGE=/ubuntu-installer/amd64/linux gfxpayload=800x600x16,800x600 ---
auto=true url=dc10b DEBCONF_DEBUG=5 tasks= hostname=
interface=00:26:9e:03:9d:e5 partman-auto/disk=/dev/sda



On Fri, Apr 28, 2017 at 5:53 PM, Simon Kelley <si...@thekelleys.org.uk>
wrote:

> On 27/04/17 17:42, Carl Karsten wrote:
> > I am looking for the syntax of dhcp vendor options, and then how to
> > access them in grub-net.  I think.  maybe there is a better way.
> >
> > I pxe boot grub, which boots di (Debian Installer) and pass a preseed
> file.
> >
> > I am trying to work out a nice way to pass host specific info to di
> > example, most use:
> > partman-auto/disk="/dev/sda"
> > but one machine has an onboard ssd nvme which needs /dev/nvme0n1
> >
> > di will read values appended to the kernel boot line, so I can hard code
> > it like this:
> >
> > menuentry "Install Ubuntu preseed" {
> > set gfxpayload=keep
> > linux /ubuntu-installer/amd64/linux gfxpayload=800x600x16,800x600 ---
> > auto=true url=dc10b hostname= partman-auto/disk="/dev/nvme0n1"
> > interface=${net_default_mac}
> > initrd /ubuntu-installer/amd64/initrd.gz
> > }
> >
> > interface=${net_default_mac} - use the nic that pxe booted.
> >
> > Now I get lost in conf options and syntax.  forgive me for making stuff
> > up here, if it worked I wouldn't be asking for help.
> >
> > I am hoping for something like
> > partman-auto/disk=$(net_pxe_extensionspath/disk}
> >
> > in dnsmasq conf:
> > dhcp-host=40:8d:5c:7f:bb:90,,gator
> >
> > dhcp-option-force=host:gator,209,"disk=/dev/nvme0n1"
> >
>
> Look for "tags" in the man page, in this case, set a tag in the
> dhcp-host line (it can be the same as the hostname)
>
> dhcp-host=40:8d:5c:7f:bb:90,set:gator,gator
>
>
> and make the option conditional on that tag
>
> dhcp-option-force=tag:gator,209,"disk=/dev/nvme0n1"
>
> >
> > So yeah, how do I send random strings based on mac/hostname
> See above
>
>
> > and how do I read what was sent in grub?
>
> Set the "log-dhcp" flag in the dnsmasq configuration to get lots of
> useful information.
>
> Cheers,
>
> Simon.
>
> >
>
>
>
> > --
> > Carl K
> >
> >
> >
> > _______________________________________________
> > Dnsmasq-discuss mailing list
> > Dnsmasq-discuss@lists.thekelleys.org.uk
> > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> >
>
>
>
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss@lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>
>
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