components/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   8         # can be superseded by command line (used by Debian-Live's netboot for example)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 ${LIVE_BOOT_CMDLINE}
  10         do
  11                 case "${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         # Ensure all our net modules get loaded so we can actually compare MAC addresses...
  28         udevadm trigger
  29         udevadm settle
  30
  31         # Available Ethernet interfaces ?
  32         l_interfaces=""
  33
  34         # See if we can derive the boot device
  35         Device_from_bootif
  36
  37         if [ -z "$DEVICE" ]
  38         then
  39                 echo "Waiting for ethernet card(s) up... If this fails, maybe the ethernet card is not supported by the kernel `uname -r`?"
  40                 while [ -z "$l_interfaces" ]
  41                 do
  42                         l_interfaces="$(cd /sys/class/net/ && ls -d * 2>/dev/null | grep -v "lo")"
  43                 done
  44
  45                 if [ $(echo $l_interfaces | wc -w) -lt 2 ]
  46                 then
  47                         # only one interface : no choice
  48                         echo "DEVICE=$l_interfaces" >> /conf/param.conf
  49                         return
  50                 fi
  51
  52                 # If user force to use specific device, write it
  53                 for ARGUMENT in ${LIVE_BOOT_CMDLINE}
  54                 do
  55                         case "${ARGUMENT}" in
  56                                 live-netdev=*)
  57                                 NETDEV="${ARGUMENT#live-netdev=}"
  58                                 # net device could be specified by MAC address
  59                                 hex="[0-9A-Fa-f][0-9A-Fa-f]"
  60                                 case "${NETDEV}" in
  61                                     ${hex}:${hex}:${hex}:${hex}:${hex}:${hex})
  62                                         # MAC address; record it and select later
  63                                         netdev_mac_addr="${NETDEV}"
  64                                         ;;
  65                                     *)
  66                                         # interface name
  67                                         echo "DEVICE=$NETDEV" >> /conf/param.conf
  68                                         echo "Found live-netdev parameter, forcing to to use network device $NETDEV."
  69                                         return
  70                                         ;;
  71                                 esac
  72                                 ;;
  73                         esac
  74                 done
  75         else
  76                 l_interfaces="$DEVICE"
  77         fi
  78
  79         found_eth_dev=""
  80         while true
  81         do
  82                 echo -n "Looking for a connected Ethernet interface ..."
  83
  84                 for interface in $l_interfaces
  85                 do
  86                         # ATTR{carrier} is not set if this is not done
  87                         echo -n " $interface ?"
  88                         ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
  89                 done
  90
  91                 echo ''
  92
  93                 for step in 1 2 3 4 5
  94                 do
  95                         for interface in $l_interfaces
  96                         do
  97                             if [ -z "$netdev_mac_addr" ]; then
  98                                 carrier=$(cat /sys/class/net/$interface/carrier \
  99                                         2>/dev/null)
 100                                 # link detected
 101
 102                                 case "${carrier}" in
 103                                         1)
 104                                                 echo "Connected $interface found"
 105                                                 # inform initrd's init script :
 106                                                 found_eth_dev="$found_eth_dev $interface"
 107                                                 ;;
 108                                 esac
 109                             else
 110                                 # MAC addr given, check for that
 111                                 mac_addr=$(ifconfig "$interface" \
 112                                                   | grep HWaddr \
 113                                                   | { read _ _ _ _ mac_addr; echo $mac_addr; })
 114                                 if [ "$mac_addr" = "$netdev_mac_addr" ]; then
 115                                     found_eth_dev="$interface"
 116                                 fi
 117                             fi
 118                         done
 119                         if [ -n "$found_eth_dev" ]
 120                         then
 121                                 echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
 122                                 return
 123                         else
 124                                 # wait a bit
 125                                 sleep 1
 126                         fi
 127                 done
 128         done
 129 }