Reorganizing components in source tree.

[live-boot-grml.git] / components / 9990-select-eth-device.sh

diff --git a/components/9990-select-eth-device.sh b/components/9990-select-eth-device.sh
new file mode 100755 (executable)
index 0000000..7d1aa16
--- /dev/null
+++ b/components/9990-select-eth-device.sh
@@ -0,0 +1,104 @@
+#!/bin/sh
+
+Select_eth_device ()
+{
+       # Boot type in initramfs's config
+       bootconf=$(egrep '^BOOT=' /conf/initramfs.conf | tail -1)
+
+       # can be superseded by command line (used by Debian-Live's netboot for example)
+       for ARGUMENT in ${LIVE_BOOT_CMDLINE}
+       do
+               case "${ARGUMENT}" in
+                       netboot=*)
+                               NETBOOT="${ARGUMENT#netboot=}"
+                               ;;
+               esac
+       done
+
+       if [ "$bootconf" != "BOOT=nfs" ] && [ -z "$NETBOOT" ] && [ -z "$FETCH" ] && [ -z "$FTPFS" ] && [ -z "$HTTPFS" ]
+       then
+               # Not a net boot : nothing to do
+               return
+       fi
+
+       # we want to do some basic IP
+       modprobe -q af_packet
+
+       # Available Ethernet interfaces ?
+       l_interfaces=""
+
+       # See if we can derive the boot device
+       Device_from_bootif
+
+       if [ -z "$DEVICE" ]
+       then
+               echo "Waiting for ethernet card(s) up... If this fails, maybe the ethernet card is not supported by the kernel `uname -r`?"
+               while [ -z "$l_interfaces" ]
+               do
+                       l_interfaces="$(cd /sys/class/net/ && ls -d eth* 2>/dev/null)"
+               done
+
+               if [ $(echo $l_interfaces | wc -w) -lt 2 ]
+               then
+                       # only one interface : no choice
+                       echo "DEVICE=$l_interfaces" >> /conf/param.conf
+                       return
+               fi
+
+               # If user force to use specific device, write it
+               for ARGUMENT in ${LIVE_BOOT_CMDLINE}
+               do
+                       case "${ARGUMENT}" in
+                               live-netdev=*)
+                               NETDEV="${ARGUMENT#live-netdev=}"
+                               echo "DEVICE=$NETDEV" >> /conf/param.conf
+                               echo "Found live-netdev parameter, forcing to to use network device $NETDEV."
+                               return
+                               ;;
+                       esac
+               done
+       else
+               l_interfaces="$DEVICE"
+       fi
+
+       found_eth_dev=""
+       while true
+       do
+               echo -n "Looking for a connected Ethernet interface ..."
+
+               for interface in $l_interfaces
+               do
+                       # ATTR{carrier} is not set if this is not done
+                       echo -n " $interface ?"
+                       ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
+               done
+
+               echo ''
+
+               for step in 1 2 3 4 5
+               do
+                       for interface in $l_interfaces
+                       do
+                               carrier=$(cat /sys/class/net/$interface/carrier \
+                                       2>/dev/null)
+                               # link detected
+
+                               case "${carrier}" in
+                                       1)
+                                               echo "Connected $interface found"
+                                               # inform initrd's init script :
+                                               found_eth_dev="$found_eth_dev $interface"
+                                               ;;
+                               esac
+                       done
+                       if [ -n "$found_eth_dev" ]
+                       then
+                               echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
+                               return
+                       else
+                               # wait a bit
+                               sleep 1
+                       fi
+               done
+       done
+}