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#!/bin/sh
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#
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# Format:
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# bond=<bondname>[:<bondslaves>:[:<options>]]
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#
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# bondslaves is a comma-separated list of physical (ethernet) interfaces
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# options is a comma-separated list on bonding options (modinfo bonding for details) in format compatible with initscripts
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# if options include multi-valued arp_ip_target option, then its values should be separated by semicolon.
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#
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# bond without parameters assumes bond=bond0:eth0,eth1:mode=balance-rr
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#
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# return if bond already parsed
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[ -n "$bondname" ] && return
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# Check if bond parameter is valid
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if getarg bond= >/dev/null ; then
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if [ -z "$netroot" ] ; then
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die "No netboot configured, bond is invalid"
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fi
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command -v brctl >/dev/null 2>&1 || die "No 'brctl' installed"
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fi
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# We translate list of slaves to space-separated here to mwke it easier to loop over them in ifup
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# Ditto for bonding options
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parsebond() {
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local v=${1}:
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set --
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while [ -n "$v" ]; do
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set -- "$@" "${v%%:*}"
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v=${v#*:}
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done
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unset bondname bondslaves bondoptions
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case $# in
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0) bondname=bond0; bondslaves="eth0 eth1" ;;
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1) bondname=$1; bondslaves="eth0 eth1" ;;
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2) bondname=$1; bondslaves=$(echo $2|tr "," " ") ;;
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3) bondname=$1; bondslaves=$(echo $2|tr "," " "); bondoptions=$(echo $3|tr "," " ") ;;
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*) die "bond= requires zero to four parameters" ;;
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esac
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}
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unset bondname bondslaves bondoptions
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# Parse bond for bondname, bondslaves, bondmode and bondoptions
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if getarg bond >/dev/null; then
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# Read bond= parameters if they exist
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bond="$(getarg bond=)"
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if [ ! "$bond" = "bond" ]; then
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parsebond "$(getarg bond=)"
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fi
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# Simple default bond
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if [ -z "$bondname" ]; then
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bondname=bond0
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bondslaves="eth0 eth1"
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fi
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# Make it suitable for initscripts export
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bondoptions=$(echo $bondoptions|tr ";" ",")
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echo "bondname=$bondname" > /tmp/bond.info
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echo "bondslaves=\"$bondslaves\"" >> /tmp/bond.info
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echo "bondoptions=\"$bondoptions\"" >> /tmp/bond.info
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return
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fi
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