scripts/live-premount/select_eth_device

   1 #!/bin/sh
   2
   3 # Original script by Andreas Teuchert <ant+dl@hsg-kl.de>
   4 # Modified by Frédéric Boiteux <fboiteux@calistel.com>
   5
   6 PREREQ="blacklist udev"
   7
   8 prereqs()
   9 {
  10         echo "$PREREQ"
  11 }
  12
  13 case $1 in
  14 # get pre-requisites
  15 prereqs)
  16         prereqs
  17         exit 0
  18         ;;
  19 esac
  20
  21 # Boot type in initramfs's config
  22 bootconf=$(egrep '^BOOT=' /conf/initramfs.conf | tail -1)
  23
  24 # can be superseded by command line (used by Debian-Live's netboot for example)
  25 for ARGUMENT in $(cat /proc/cmdline); do
  26         case "${ARGUMENT}" in
  27                 netboot=*)
  28                         NETBOOT="${ARGUMENT#netboot=}"
  29                         ;;
  30         esac
  31 done
  32
  33 if [ "$bootconf" != "BOOT=nfs" ] &&
  34    [ "$NETBOOT" = "" ] &&
  35    [ "$FETCH" = "" ] &&
  36    [ "$FTPFS" = "" ] &&
  37    [ "$HTTPFS" = "" ]
  38 then
  39     # Not a net boot : nothing to do
  40     exit 0
  41 fi
  42
  43 # we want to do some basic IP
  44 modprobe -q af_packet
  45
  46 # Available Ethernet interfaces ?
  47 l_interfaces=""
  48 echo "Waiting for ethernet card(s) up... If this fails, maybe the ethernet card is not supported by the kernel `uname -r`?"
  49 while [ -z "$l_interfaces" ]; do
  50   l_interfaces="$(cd /sys/class/net/ && ls -d eth* 2>/dev/null)"
  51 done
  52
  53 if [ $(echo $l_interfaces | wc -w) -lt 2 ]; then
  54         # only one interface : no choice
  55         echo "DEVICE=$l_interfaces" >> /conf/param.conf
  56         exit 0
  57 fi
  58
  59 # If user force to use specific device, write it
  60 for ARGUMENT in $(cat /proc/cmdline); do
  61     case "${ARGUMENT}" in
  62         live-netdev=*)
  63         NETDEV="${ARGUMENT#live-netdev=}"
  64         echo "DEVICE=$NETDEV" >> /conf/param.conf
  65         echo "Found live-netdev parameter in /proc/cmdline. Force to use network device $NETDEV."
  66         exit 0
  67         ;;
  68     esac
  69 done
  70
  71 while true; do
  72         echo -n "Looking for a connected Ethernet interface ..."
  73
  74         for interface in $l_interfaces; do
  75                 # ATTR{carrier} is not set if this is not done
  76                 echo -n " $interface ?"
  77                 ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
  78         done
  79
  80         echo ''
  81
  82         for step in 1 2 3 4 5; do
  83                 for interface in $l_interfaces; do
  84                         carrier=$(cat /sys/class/net/$interface/carrier \
  85                                 2>/dev/null)
  86                         # link detected
  87                         if [ "$carrier" = 1 ]; then
  88                                 echo " found $interface."
  89                                 # inform initrd's init script :
  90                                 echo "DEVICE=$interface" >> /conf/param.conf
  91                                 exit 0
  92                         fi
  93                 done
  94                 # wait a bit
  95                 sleep 1
  96         done
  97 done