kern/121566: [nfs] [request] [patch] ethernet iface should be brought up when booting from a mfs_root over nfs

[Robert Schulze]

The following reply was made to PR kern/121566; it has been noted by GNATS.

From: Robert Schulze <rs at bytecamp.net>
To: bug-followup at FreeBSD.org, rs at bytecamp.net
Cc:  
Subject: Re: kern/121566: [nfs] [request] [patch] ethernet iface should be
 brought up when booting from a mfs_root over nfs
Date: Tue, 25 Mar 2008 11:54:38 +0100

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 First sorry for the first "proof-of-concept"-like patch.
 
 I now appended one that does some more checking and sets nfsroot 
 according to variables from kenv to accomplish relative paths in 
 diskless_remount.
 
 
 with kind regards,
 
 Robert Schulze
 
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 --- rc.initdiskless.dflt	Tue Mar 25 11:49:22 2008
 +++ rc.initdiskless	Tue Mar 25 11:25:09 2008
 @@ -163,6 +163,47 @@
      fi
  }
  
 +# Fire up an interface to do nfs-mounts if this machine
 +# was booted from a md_root
 +# Use kenv to get the configuration vom dhcp like
 +# /sys/nfsclient/nfs_vfsops.c does
 +
 +ifconfig_kenv()
 +{
 +IF=`kenv | grep 'boot.netif.name' | awk 'BEGIN {FS="="} {print $2}' | sed 's/"//g'`
 +
 +# check if ifname is nonempty
 +#
 +if [ "x$IF" = "x" ]; then
 +	return 0
 +fi
 +
 +# check if interface is already up 
 +#
 +ifcfg=`ifconfig ${IF} | grep -q inet`
 +if [ $? -eq "0" ]; then
 +	return 0
 +fi
 +
 +GW=`kenv | grep 'boot.netif.gateway' | awk 'BEGIN {FS="="} {print $2}' | sed 's/"//g'`
 +IP=`kenv | grep 'boot.netif.ip' | awk 'BEGIN {FS="="} {print $2}' | sed 's/"//g'`
 +NM=`kenv | grep 'boot.netif.netmask' | awk 'BEGIN {FS="="} {print $2}' | sed 's/"//g'`
 +
 +echo "configuring $IF from kenv: $IP netmask $NM gw $GW"
 +ifconfig $IF $IP netmask $NM up
 +route add default $GW
 +
 +# setting nfsroot to accomplish relative paths
 +# in diskless_remount
 +
 +nfsroot=`kenv | grep 'boot.nfsroot.path' | awk 'BEGIN {FS="="} {print $2}' | sed 's/"//g'`
 +nfsserver=`kenv | grep 'boot.nfsroot.server' | awk 'BEGIN {FS="="} {print $2}' | sed 's/"//g'`
 +
 +nfsroot="$nfsserver:$nfsroot"
 +
 +
 +}
 +
  # DEBUGGING
  #
  # set -v
 @@ -175,6 +216,8 @@
  class=""
  if [ ${dlv:=0} -ne 0 ] ; then
  	iflist=`ifconfig -l`
 +	ifconfig_kenv
 +
  	for i in ${iflist} ; do
  	    set -- `ifconfig ${i}`
  	    while [ $# -ge 1 ] ; do
 
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