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openwrt-xburst/obsolete-buildroot/sources/openwrt/root/etc/functions.sh

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#!/bin/ash
alias debug=${DEBUG:-:}
# allow env to override nvram
nvram () {
case $1 in
get) eval "echo \${NVRAM_$2:-\$(command nvram get $2)}";;
*) command nvram $*;;
esac
}
. /etc/nvram.overrides
# valid interface?
if_valid () {
ifconfig "$1" >&- 2>&- ||
[ "${1%%[0-9]}" = "br" ] ||
{
[ "${1%%[0-9]}" = "vlan" ] && (
i=${1#vlan}
hwname=$(nvram get vlan${i}hwname)
hwaddr=$(nvram get ${hwname}macaddr)
[ -z "$hwaddr" ] && return 1
vif=$(ifconfig -a | awk '/^eth.*'$hwaddr'/ {print $1; exit}' IGNORECASE=1)
debug "# vlan$i => $vif"
$DEBUG ifconfig $vif up
$DEBUG vconfig add $vif $i 2>&-
)
} ||
{ echo -e "# $1 ignored: can't find/create"; false; }
}