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Re: [PATCH] bootp: set is_def while processing dhcp ack


From: Nikunj A Dadhania
Subject: Re: [PATCH] bootp: set is_def while processing dhcp ack
Date: Thu, 17 Mar 2016 11:46:40 +0530
User-agent: Notmuch/0.21 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-redhat-linux-gnu)

Andrei Borzenkov <address@hidden> writes:

> On Wed, Mar 16, 2016 at 1:16 PM, Nikunj A Dadhania
> <address@hidden> wrote:
>> Hi Andrei,
>>
>>> If you call net_bootp manually,
>>
>> Thats what we are using in this current case, booting from the disk,
>> and the grub.cfg has a netboot entry.
>>
>> menuentry 'Linux dev netboot' --class os {
>>      insmod net
>>      insmod ofnet
>>      insmod tftp
>>
>>      net_bootp
>>
>>      echo 'Network status: '
>>      net_ls_cards
>>      net_ls_addr
>>      net_ls_routes
>>
>>      echo 'Loading Linux ...'
>>      linux  (tftp)/ubuntu-installer/ppc64el/vmlinux tasks=standard 
>> pkgsel/language-pack-patterns= pkgsel/install-language-support=false --- 
>> quiet
>>      initrd     (tftp)/ubuntu-installer/ppc64el/initrd.gz
>> }
>>
>
> OK, so you attempt to configure everything. The first obvious question
> is - *which* interface should now become default? Your patch would
> make them compete, whoever is the last would win.
>
> We would need to define some mechanism to designate interface as "default" 
> here.
>
>>> server is stored in environment variable net_<if>_dhcp_server_name;
>>> you are free to use it as needed, e.g. set $root and $prefix.
>>>
>
> You can already fetch this information from environment. Something like
>
> for i in 0 1 2 3 4 5; do
>   eval "set ip=\$net_ofnet${i}_dhcp_server"

I dont see net_ofnet0_dhcp_server or net_ofnet_dhcp_server set

>   if [ -n "$ip" ]; then
>     set boot_from=tftp,$ip
>     break
>   fi
> done
>
> And later use ($boot_from) everywhere.

Regards
Nikunj




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