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-rwxr-xr-xsystem-boot/components/9990-select-eth-device.sh108
1 files changed, 108 insertions, 0 deletions
diff --git a/system-boot/components/9990-select-eth-device.sh b/system-boot/components/9990-select-eth-device.sh
new file mode 100755
index 0000000..c8f36b0
--- /dev/null
+++ b/system-boot/components/9990-select-eth-device.sh
@@ -0,0 +1,108 @@
+#!/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+ # can be superseded by command line (used by Debian-Live's netboot for example)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
+
+ # Ensure all our net modules get loaded so we can actually compare MAC addresses...
+ udevadm trigger
+ udevadm settle
+
+ # 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 * 2>/dev/null | grep -v "lo")"
+ 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
+}