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  33         # can be superseded by command line (used by Debian-Live's netboot for example)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="${ARGUMENT#live-netdev=}"
  84
  85                                 # Check if NETDEV is a valid MAC address
  86                                 if echo "$NETDEV" | grep -Eq '^[0-9A-Fa-f]{2}[:-]([0-9A-Fa-f]{2}[:-]){4}[0-9A-Fa-f]{2}$'
  87                                 then
  88                                         echo "NETDEV is a valid MAC address."
  89
  90                                         # Retrieve the device name associated with the MAC address
  91                                         DEVICE_NAME=$(ip -o link | awk -v mac="$NETDEV" '$0 ~ mac{print substr($2, 1, length($2)-1)}')
  92                                         if [ -n "$DEVICE_NAME" ]
  93                                         then
  94                                                 echo "Device name for MAC address $NETDEV is $DEVICE_NAME."
  95                                                 NETDEV="$DEVICE_NAME"
  96                                         fi
  97                                 else
  98                                         echo "NETDEV is not a valid MAC address. Assuming it is a device name."
  99                                 fi
 100
 101                                 echo "DEVICE=$NETDEV" >> /conf/param.conf
 102                                 echo "Found live-netdev parameter, forcing it to use network device $NETDEV."
 103                                 Wait_for_carrier "$NETDEV"
 104                                 return
 105                                 ;;
 106                         esac
 107                 done
 108         else
 109                 l_interfaces="$DEVICE"
 110         fi
 111
 112         found_eth_dev=""
 113         while true
 114         do
 115                 echo -n "Looking for a connected Ethernet interface ..."
 116
 117                 for interface in $l_interfaces
 118                 do
 119                         # ATTR{carrier} is not set if this is not done
 120                         echo -n " $interface ?"
 121                         ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
 122                         sleep 1
 123                 done
 124
 125                 echo ''
 126
 127                 for step in 1 2 3 4 5
 128                 do
 129                         for interface in $l_interfaces
 130                         do
 131                                 ip link set $interface up
 132                                 carrier=$(cat /sys/class/net/$interface/carrier \
 133                                         2>/dev/null)
 134                                 # link detected
 135
 136                                 case "${carrier}" in
 137                                         1)
 138                                                 echo "Connected $interface found"
 139                                                 # inform initrd's init script :
 140                                                 found_eth_dev="$found_eth_dev $interface"
 141                                                 found_eth_dev="$(echo $found_eth_dev | sed -e "s/^[[:space:]]*//g")"
 142                                                 ;;
 143                                 esac
 144                         done
 145                         if [ -n "$found_eth_dev" ]
 146                         then
 147                                 echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
 148                                 return
 149                         else
 150                                 # wait a bit
 151                                 sleep 1
 152                         fi
 153                 done
 154         done
 155 }