Converting select_eth_device initramfs-tools pre-mount script into regular live-boot script.

1 files changed, 87 insertions, 0 deletions

diff --git a/scripts/boot/select-eth-device.sh b/scripts/boot/select-eth-device.sh
new file mode 100755
index 0000000..924b8bc
--- /dev/null
+++ b/scripts/boot/select-eth-device.sh
@@ -0,0 +1,87 @@
+#!/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+	# can be superseded by command line (used by Debian-Live's netboot for example)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 $(cat /proc/cmdline); do
+		case "${ARGUMENT}" in
+			netboot=*)
+				NETBOOT="${ARGUMENT#netboot=}"
+				;;
+		esac
+	done
+
+	if [ "$bootconf" != "BOOT=nfs" ] &&
+	   [ "$NETBOOT" = "" ] &&
+	   [ "$FETCH" = "" ] &&
+	   [ "$FTPFS" = "" ] &&
+	   [ "$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=""
+	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 $(cat /proc/cmdline); do
+	    case "${ARGUMENT}" in
+	        live-netdev=*)
+	        NETDEV="${ARGUMENT#live-netdev=}"
+	        echo "DEVICE=$NETDEV" >> /conf/param.conf
+		echo "Found live-netdev parameter in /proc/cmdline. Force to use network device $NETDEV."
+	        return
+	        ;;
+	    esac
+	done
+
+	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/$interface/carrier \
+					2>/dev/null)
+				# link detected
+				if [ "$carrier" = 1 ]; then
+					echo "Connected $interface found"
+					# inform initrd's init script :
+					found_eth_dev="$found_eth_dev $interface"
+				fi
+			done
+			if [ -n "$found_eth_dev" ]; then
+				echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
+				return
+			else
+				# wait a bit
+				sleep 1
+			fi
+		done
+	done
+}