package/skeleton/nfs_check

   1 #!/bin/sh
   2
   3 # This allows NFS booting to work while also being able to configure
   4 # the network interface via DHCP when not NFS booting.  Otherwise, a
   5 # NFS booted system will likely hang during DHCP configuration.
   6
   7 # Attempting to configure the network interface used for NFS will
   8 # initially bring that network down.  Since the root filesystem is
   9 # accessed over this network, the system hangs.
  10
  11 # This script is run by ifup and will attempt to detect if a NFS root
  12 # mount uses the interface to be configured (IFACE), and if so does
  13 # not configure it.  This should allow the same build to be disk/flash
  14 # booted or NFS booted.
  15
  16 nfsip=`sed -n '/^[^ ]*:.* \/ nfs.*[ ,]addr=\([0-9.]\+\).*/s//\1/p' /proc/mounts`
  17 if [ -n "$nfsip" ] && ip route get to "$nfsip" | grep -q "dev $IFACE"; then
  18         echo Skipping $IFACE, used for NFS from $nfsip
  19         exit 1
  20 fi