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   8         # can be superseded by command line (used by Debian-Live's netboot for example)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 eth* 2>/dev/null)"
  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="${ARGUMENT#live-netdev=}"
  58                                 echo "DEVICE=$NETDEV" >> /conf/param.conf
  59                                 echo "Found live-netdev parameter, forcing to to use network device $NETDEV."
  60                                 return
  61                                 ;;
  62                         esac
  63                 done
  64         else
  65                 l_interfaces="$DEVICE"
  66         fi
  67
  68         found_eth_dev=""
  69         while true
  70         do
  71                 echo -n "Looking for a connected Ethernet interface ..."
  72
  73                 for interface in $l_interfaces
  74                 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
  83                 do
  84                         for interface in $l_interfaces
  85                         do
  86                                 carrier=$(cat /sys/class/net/$interface/carrier \
  87                                         2>/dev/null)
  88                                 # link detected
  89
  90                                 case "${carrier}" in
  91                                         1)
  92                                                 echo "Connected $interface found"
  93                                                 # inform initrd's init script :
  94                                                 found_eth_dev="$found_eth_dev $interface"
  95                                                 ;;
  96                                 esac
  97                         done
  98                         if [ -n "$found_eth_dev" ]
  99                         then
 100                                 echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
 101                                 return
 102                         else
 103                                 # wait a bit
 104                                 sleep 1
 105                         fi
 106                 done
 107         done
 108 }