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#!/bin/sh
[ "$VERBOSITY" = 1 ] && set -x
sysfs()
{
# Called with :
# $1 = value to write. Won't write if $1 is empty.
# $2 = basename of the file in bonding/ to write to.
if [ "$1" ] ; then
echo "$1" > "/sys/class/net/$IFACE/master/bonding/$2"
return $?
fi
return 0
}
# If the stanza bond-give-a-chance is set for a slave interface,
# then force $IFACE to be the primary for some time, then restore primary to it previous value.
# This stanza is designed to workaround a bug in wpa_supplicant, when used with bonding :
# wpa_supplicant expect wifi authentication packets on the bond interface, but also send wifi authentication packets on the bond interface.
# If the active interface is not the wifi interface at the time wpa_supplicant try to authenticate, the wifi AP won't receive anything, causing the authentication to fail.
# In order for the wifi authentication to succeed, one need to give a chance to the wifi interface to send authentication packets.
# "bond-give-a-chance 10" will set the wifi interface as the primary interface for 10 seconds, then restore the previous primary interface.
# This is supposed to be enought to give a chance to wifi to authenticate properly.
if [ "$IF_BOND_GIVE_A_CHANCE" ] ; then
read primary < "/sys/class/net/$IFACE/master/bonding/primary"
# Set the temporary primary.
sysfs "$IFACE" primary
# Wait for the link to be setup, but not longer that $IF_BOND_GIVE_A_CHANGE seconds.
while [ "$IF_BOND_GIVE_A_CHANCE" -gt 0 ] ; do
if ip link show $IFACE | grep -sq 'state UP'; then
break
fi
sleep 1
IF_BOND_GIVE_A_CHANCE=`expr $IF_BOND_GIVE_A_CHANCE - 1`
done
# Restore the previous primary.
sysfs "$primary" primary
fi
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