#!/bin/sh
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# This allows NFS booting to work while also being able to configure
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# the network interface via DHCP when not NFS booting. Otherwise, a
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# NFS booted system will likely hang during DHCP configuration.
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# Attempting to configure the network interface used for NFS will
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# initially bring that network down. Since the root filesystem is
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# accessed over this network, the system hangs.
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# This script is run by ifup and will attempt to detect if a NFS root
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# mount uses the interface to be configured (IFACE), and if so does
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# not configure it. This should allow the same build to be disk/flash
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# booted or NFS booted.
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nfsip=`sed -n '/^[^ ]*:.* \/ nfs.*[ ,]addr=\([0-9.]\+\).*/s//\1/p' /proc/mounts`
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if [ -n "$nfsip" ] && ip route get to "$nfsip" | grep -q "dev $IFACE"; then
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echo Skipping $IFACE, used for NFS from $nfsip
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exit 1
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fi
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