components/9990-select-eth-device.sh

   1 #!/bin/sh
   2
   3 Wait_for_carrier ()
   4 {
   5         # $1 = network device
   6         echo -n "Waiting for link to come up on $1... "
   7         ip link set $1 up
   8         for step in $(seq 1 15)
   9         do
  10                 carrier=$(cat /sys/class/net/$1/carrier \
  11                 2>/dev/null)
  12                 case "${carrier}" in
  13                         1)
  14                         echo -e "\nLink is up"
  15                         return
  16                         ;;
  17                         *)
  18                         # Counter
  19                         echo -n "$step "
  20                         ;;
  21                 esac
  22                 sleep 1
  23         done
  24         echo -e "\nError - carrier not detected on $1."
  25         ip link set $1 down
  26 }
  27
  28 Select_eth_device ()
  29 {
  30         # Boot type in initramfs's config
  31         bootconf=$(egrep '^BOOT=' /conf/initramfs.conf | tail -1)
  32
  33         # can be superseded by command line (used by Debian-Live's netboot for example)
  34         for ARGUMENT in ${LIVE_BOOT_CMDLINE}
  35         do
  36                 case "${ARGUMENT}" in
  37                         netboot=*)
  38                                 NETBOOT="${ARGUMENT#netboot=}"
  39                                 ;;
  40                 esac
  41         done
  42
  43         if [ "$bootconf" != "BOOT=nfs" ] && [ -z "$NETBOOT" ] && [ -z "$FETCH" ] && [ -z "$FTPFS" ] && [ -z "$HTTPFS" ]
  44         then
  45                 # Not a net boot : nothing to do
  46                 return
  47         fi
  48
  49         # we want to do some basic IP
  50         modprobe -q af_packet
  51
  52         # Ensure all our net modules get loaded so we can actually compare MAC addresses...
  53         udevadm trigger
  54         udevadm settle
  55
  56         # Available Ethernet interfaces ?
  57         l_interfaces=""
  58
  59         # See if we can derive the boot device
  60         Device_from_bootif
  61
  62         if [ -z "$DEVICE" ]
  63         then
  64                 echo "Waiting for ethernet card(s) up... If this fails, maybe the ethernet card is not supported by the kernel `uname -r`?"
  65                 while [ -z "$l_interfaces" ]
  66                 do
  67                         l_interfaces="$(cd /sys/class/net/ && ls -d * 2>/dev/null | grep -v "lo")"
  68                 done
  69
  70                 if [ $(echo $l_interfaces | wc -w) -lt 2 ]
  71                 then
  72                         # only one interface : no choice
  73                         echo "DEVICE=$l_interfaces" >> /conf/param.conf
  74                         Wait_for_carrier $l_interfaces
  75                         return
  76                 fi
  77
  78                 # If user force to use specific device, write it
  79                 for ARGUMENT in ${LIVE_BOOT_CMDLINE}
  80                 do
  81                         case "${ARGUMENT}" in
  82                                 live-netdev=*)
  83                                 NETDEV="${ARGUMENT#live-netdev=}"
  84                                 echo "DEVICE=$NETDEV" >> /conf/param.conf
  85                                 echo "Found live-netdev parameter, forcing to to use network device $NETDEV."
  86                                 Wait_for_carrier $NETDEV
  87                                 return
  88                                 ;;
  89                         esac
  90                 done
  91         else
  92                 l_interfaces="$DEVICE"
  93         fi
  94
  95         found_eth_dev=""
  96         while true
  97         do
  98                 echo -n "Looking for a connected Ethernet interface ..."
  99
 100                 for interface in $l_interfaces
 101                 do
 102                         # ATTR{carrier} is not set if this is not done
 103                         echo -n " $interface ?"
 104                         ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
 105                         sleep 1
 106                 done
 107
 108                 echo ''
 109
 110                 for step in 1 2 3 4 5
 111                 do
 112                         for interface in $l_interfaces
 113                         do
 114                                 ip link set $interface up
 115                                 carrier=$(cat /sys/class/net/$interface/carrier \
 116                                         2>/dev/null)
 117                                 # link detected
 118
 119                                 case "${carrier}" in
 120                                         1)
 121                                                 echo "Connected $interface found"
 122                                                 # inform initrd's init script :
 123                                                 found_eth_dev="$found_eth_dev $interface"
 124                                                 found_eth_dev="$(echo $found_eth_dev | sed -e "s/^[[:space:]]*//g")"
 125                                                 ;;
 126                                 esac
 127                         done
 128                         if [ -n "$found_eth_dev" ]
 129                         then
 130                                 echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
 131                                 return
 132                         else
 133                                 # wait a bit
 134                                 sleep 1
 135                         fi
 136                 done
 137         done
 138 }