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#!/bin/sh
# (C) 2007 Canonical Ltd.
# Author: Alexander Sack <asac@jwsdot.com>
# License: GNU General Public License, version 2 or any later version
if test x$NIF_FILE = x; then
NIF_FILE=/etc/network/interfaces
fi
auto_ifs=$(cat $NIF_FILE | \
egrep "^auto|^allow-" | \
sed -e 's/auto//' | \
sed -e 's/allow-[^ ].* //')
ifaces_to_disable=""
echo Auto interfaces found: $auto_ifs
# iterate over all auto interfaces
for i in $auto_ifs; do
IFS_old=$IFS; IFS=""
NIF_FILE_content=$(cat $NIF_FILE | \
sed -e 's/^[ \t]*auto.*$//' | \
sed -e 's/^[ \t]*allow-.*$//' | \
sed -e 's/^[ \t]*#.*$//' | grep -v ^$)
# '--' is inserted by grep -A1 if there are multiple iface blocks
lines=$(echo $NIF_FILE_content | grep -A1 "^iface.*$i.*dhcp" | grep -v '\--')
IFS="
"
# if there is no iface line for that interface, we would still get a line
# count of 1 ... so use word_count 0 below to exclude ifaces that have no
# configuration at all.
word_count=$(echo $lines | wc -w)
line_count=0
for line in $lines; do
nulled_line=$(echo "$line" | sed -e 's/[# ]//' | grep -v ^iface)
if test x$nulled_line != x; then
line_count=$(expr $line_count + 1)
fi
done
if test $line_count -eq 0 -a $word_count -gt 0; then
ifaces_to_disable="$ifaces_to_disable $i"
echo iface to disable = $i
fi
IFS=$IFS_old
done
backup_suffix=0
while test -e ${NIF_FILE}.bak-${backup_suffix}; do
backup_suffix=$(expr $backup_suffix + 1)
done
if [ -n "$ifaces_to_disable" ]; then
cp $NIF_FILE "$NIF_FILE.bak-${backup_suffix}"
for i in $ifaces_to_disable; do
echo -n "Disabling interface: $i ... "
sed -i -e "s/^\([ \t]*iface.*$i.*\)$/#NetworkManager#\1/" $NIF_FILE
echo done.
done
fi
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