scripts/boot/9990-select-eth-device.sh

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   8         # can be superseded by command line (used by Debian-Live's netboot for example)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