Bug#535008: configure_networking: support BOOTIF variable set by pxelinux

[Christoph Bussenius <pepe@mathematik.uni-muenchen.de>]

Package: initramfs-tools
Version: 0.85i
Followup-For: Bug #535008

Hi,

you may use the following script as a temporary fix.

Depending on your initrd, you have to put the script (which I call
"pxedev") into one of the following places (putting it in both does not
seem to hurt):

   * /etc/initramfs-tools/scripts/nfs-top/pxedev
   * /etc/initramfs-tools/scripts/live-premount/pxedev

and then re-generate the initrd.

(Excuse the anachronistic shell-scripting style; this has to work with
minimal Bourne shell clones.)

Regards,
Christoph



#!/bin/sh

case $1 in
    prereqs) exit 0;;
esac


. /conf/initramfs.conf


echo '*******************************************************************'
echo '* pxedev auto-detection:                                          *'
echo "* DEVICE is ${DEVICE:-not set}."

# The BOOTIF parameter will be set by pxelinux if the line "ipappend 2"
# is in pxelinux.cfg

BOOTIF=
for bootparam in $(cat /proc/cmdline); do
    case $bootparam in
        BOOTIF=*)
            BOOTIF=${bootparam#BOOTIF=}
            BOOTIF=${BOOTIF#01-}
            BOOTIF=$(echo "$BOOTIF" | tr '.-' '.:')
            echo "* pxelinux tells us, BOOTIF=$BOOTIF"
            ;;
    esac
done

if [ -z "$BOOTIF" ]; then
    echo '* pxelinux did not give us a mac address'
else

    bootdevname=

    for devpath in /sys/class/net/*; do
        dev=${devpath##*/}
        addr=$(cat "$devpath/address")
        echo -n "* $dev has address $addr"
        if [ "x$BOOTIF" = "x$addr" ]; then
            echo -n ' [AHA!]'
            bootdevname=$dev
        fi
        echo
    done

    if [ "x$bootdevname" = x ]; then
        echo '* No matching device found :('
    elif [ "x$DEVICE" = "x$bootdevname" ]; then
        echo '* DEVICE already matches BOOTIF, leaving it as it is'
    else
        echo "* Setting DEVICE to $bootdevname"
        echo "DEVICE=$bootdevname" >> /conf/param.conf
    fi
fi

echo '*******************************************************************'