etc_init_d_networking

#!/bin/sh -e
### BEGIN INIT INFO
# Provides:          networking
# Required-Start:
# Required-Stop:     $local_fs
# Should-Start:      ifupdown
# Should-Stop:       ifupdown
# Default-Start:
# Default-Stop:      0 6
# Short-Description: Raise network interfaces.
### END INIT INFO

PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin"

[ -x /sbin/ifup ] || exit 0

. /lib/lsb/init-functions

# helper function to set the usplash timeout. https://launchpad.net/bugs/21617
usplash_timeout () {
	TIMEOUT=$1
	if [ -x /sbin/usplash_write ]; then
	    /sbin/usplash_write "TIMEOUT $TIMEOUT" || true
	fi
}

process_options() {
    [ -e /etc/network/options ] || return 0
    log_warning_msg "/etc/network/options still exists and it will be IGNORED! Read README.Debian of netbase."
}

check_network_file_systems() {
    [ -e /proc/mounts ] || return 0

    if [ -e /etc/iscsi/iscsi.initramfs ]; then
	log_warning_msg "not deconfiguring network interfaces: iSCSI root is mounted."
	exit 0
    fi

    exec 9<&0 < /proc/mounts
    while read DEV MTPT FSTYPE REST; do
	case $DEV in
	/dev/nbd*|/dev/nd[a-z]*|/dev/etherd/e*)
	    log_warning_msg "not deconfiguring network interfaces: network devices still mounted."
	    exit 0
	    ;;
	esac
	case $FSTYPE in
	nfs|nfs4|smbfs|ncp|ncpfs|cifs|coda|ocfs2|gfs|pvfs|pvfs2|fuse.httpfs|fuse.curlftpfs)
	    log_warning_msg "not deconfiguring network interfaces: network file systems still mounted."
	    exit 0
	    ;;
	esac
    done
    exec 0<&9 9<&-
}

check_network_swap() {
    [ -e /proc/swaps ] || return 0

    exec 9<&0 < /proc/swaps
    while read DEV MTPT FSTYPE REST; do
	case $DEV in
	/dev/nbd*|/dev/nd[a-z]*|/dev/etherd/e*)
	    log_warning_msg "not deconfiguring network interfaces: network swap still mounted."
	    exit 0
	    ;;
	esac
    done
    exec 0<&9 9<&-
}

case "$1" in
start)
	/lib/init/upstart-job networking start
	;;

stop)
	check_network_file_systems
	check_network_swap

	# Anything that manages network interfaces *MUST* wait for this event
	initctl emit deconfiguring-networking

	log_action_begin_msg "Deconfiguring network interfaces"
	if [ "$VERBOSE" != no ]; then
	    if ifdown -a --exclude=lo; then
		log_action_end_msg $?
	    else
		log_action_end_msg $?
	    fi
	else
	    if ifdown -a --exclude=lo >/dev/null 2>/dev/null; then
		log_action_end_msg $?
	    else
		log_action_end_msg $?
	    fi
	fi
	;;

force-reload|restart)
	process_options

	log_warning_msg "Running $0 $1 is deprecated because it may not enable again some interfaces"
	log_action_begin_msg "Reconfiguring network interfaces"
	ifdown -a --exclude=lo || true
	if ifup -a --exclude=lo; then
	    log_action_end_msg $?
	else
	    log_action_end_msg $?
	fi
	;;

*)
	echo "Usage: /etc/init.d/networking {start|stop}"
	exit 1
	;;
esac

exit 0