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   8         # can be superseded by command line (used by Debian-Live's netboot for example)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         # Available Ethernet interfaces ?
  28         l_interfaces=""
  29
  30         # See if we can derive the boot device
  31         Device_from_bootif
  32
  33         if [ -z "$DEVICE" ]
  34         then
  35                 echo "Waiting for ethernet card(s) up... If this fails, maybe the ethernet card is not supported by the kernel `uname -r`?"
  36                 while [ -z "$l_interfaces" ]
  37                 do
  38                         l_interfaces="$(cd /sys/class/net/ && ls -d eth* 2>/dev/null)"
  39                 done
  40
  41                 if [ $(echo $l_interfaces | wc -w) -lt 2 ]
  42                 then
  43                         # only one interface : no choice
  44                         echo "DEVICE=$l_interfaces" >> /conf/param.conf
  45                         return
  46                 fi
  47
  48                 # If user force to use specific device, write it
  49                 for ARGUMENT in ${LIVE_BOOT_CMDLINE}
  50                 do
  51                         case "${ARGUMENT}" in
  52                                 live-netdev=*)
  53                                 NETDEV="${ARGUMENT#live-netdev=}"
  54                                 echo "DEVICE=$NETDEV" >> /conf/param.conf
  55                                 echo "Found live-netdev parameter, forcing to to use network device $NETDEV."
  56                                 return
  57                                 ;;
  58                         esac
  59                 done
  60         else
  61                 l_interfaces="$DEVICE"
  62         fi
  63
  64         found_eth_dev=""
  65         while true
  66         do
  67                 echo -n "Looking for a connected Ethernet interface ..."
  68
  69                 for interface in $l_interfaces
  70                 do
  71                         # ATTR{carrier} is not set if this is not done
  72                         echo -n " $interface ?"
  73                         ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
  74                 done
  75
  76                 echo ''
  77
  78                 for step in 1 2 3 4 5
  79                 do
  80                         for interface in $l_interfaces
  81                         do
  82                                 carrier=$(cat /sys/class/net/$interface/carrier \
  83                                         2>/dev/null)
  84                                 # link detected
  85
  86                                 case "${carrier}" in
  87                                         1)
  88                                                 echo "Connected $interface found"
  89                                                 # inform initrd's init script :
  90                                                 found_eth_dev="$found_eth_dev $interface"
  91                                                 ;;
  92                                 esac
  93                         done
  94                         if [ -n "$found_eth_dev" ]
  95                         then
  96                                 echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
  97                                 return
  98                         else
  99                                 # wait a bit
 100                                 sleep 1
 101                         fi
 102                 done
 103         done
 104 }