#!/bin/sh -e
### BEGIN INIT INFO
# Provides:          networking ifupdown
# Required-Start:    mountkernfs $local_fs urandom
# Required-Stop:     $local_fs
# Default-Start:     S
# Default-Stop:      0 6
# Short-Description: Raise network interfaces.
# Description:       Prepare /run/network directory, ifstate file and raise network interfaces, or take them down.
### END INIT INFO

# Don't exit on error status
set +e

PATH="/sbin:/bin:/usr/bin"
RUN_DIR="/run/network"
IFSTATE="$RUN_DIR/ifstate"
STATEDIR="$RUN_DIR/state"
NET_STATE="$RUN_DIR/net-state"

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

ME=${0##*/}

. /lib/lsb/init-functions

LOG_FILE=/var/log/init.d-$ME.log
CONFIGURE_INTERFACES=yes
EXCLUDE_INTERFACES=

[ -f /etc/default/networking ] && . /etc/default/networking

: ${LOG_FILE:=/dev/null}
: ${IFUP_TIMEOUT:=60}

check_run_dir() {
    test -d "$RUN_DIR" && return
    if mkdir -p "$RUN_DIR"; then
        chown root:netdev "$RUN_DIR" || log_warning_msg "can't chown $RUN_DIR"
    else
        log_failure_msg "can't create $RUN_DIR"
        exit 1
    fi
}

check_ifstate() {
    test -r "$IFSTATE" && return
    :> "$IFSTATE"
    test -r "$IFSTATE" && return
    log_failure_msg "can't initialise $IFSTATE"
    exit 1
}

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

    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 < /proc/mounts
}

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

    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 < /proc/swaps
}

# Try to bring up every hot-plug interface that has a sys directory
# and that is not listed in EXCLUDE_INTERFACES.  Launch each interface
# in the background
ifup_hotplug () {
	local all_ifaces="${*:-$(ifquery --list --allow=hotplug 2>/dev/null)}"

    local excludes="$EXCLUDE_INTERFACES"  sys_dir=/sys/class/net

    test -d $sys_dir || return

    printf " "

    local children iface
    for iface in $all_ifaces; do
        test -d $sys_dir/$iface || continue
        case " $excludes " in  *" $iface "*) continue;;  esac

        # # Make sure ifup is not already running for this interface
        # local proc="$(ps -C ifup ho args)"
        # [ "${proc%$iface*}" != "$proc" ] && continue

        printf "%s " $iface
        echo "$ME: ifup $iface" >/dev/kmsg
        (ifup $iface >>$LOG_FILE 2>>$LOG_FILE) &
        children="$children $!"
    done

    [ -z "$children" ] && return
    local reaper=/usr/local/bin/process-reaper
    if test -x $reaper; then
    $reaper $children &
    else
    (sleep $IFUP_TIMEOUT ; kill $children) &
    fi
    return 0
}

udevadmin_settle() {
    [ -x /sbin/udevadm ] || return
    #[ -z "$(ifquery --list --exclude=lo)" ] && [ -z "$(ifquery --list --allow=hotplug 2>/dev/null)" ] && return
    udevadm settle
}

case $1 in
    start)
        init_is_upstart && exit 1
        check_run_dir
        check_ifstate
        touch $NET_STATE

        if [ "$CONFIGURE_INTERFACES" = no ]
        then
            log_action_msg "Not configuring network interfaces, see /etc/default/networking"
            log_action_end_msg 0
            exit 0
        fi
        set -f

        log_action_begin_msg "Configuring network interfaces in background"

        test -f $LOG_FILE && rm -f $LOG_FILE

        udevadmin_settle

        ifup -a && ifup_hotplug
        log_action_end_msg $?
        echo "$ME done" > /dev/kmsg
        ;;

    stop)
        init_is_upstart && exit 0
        check_network_file_systems
        check_network_swap

        rm -r $NET_STATE

        test -e /run/network/.ifstate.lock || exit 0
        log_action_begin_msg "Deconfiguring network interfaces"
        ifdown --all --exclude=lo
        log_action_end_msg $?
        ;;

    reload)
        init_is_upstart && exit 1

        log_action_begin_msg "Reloading network interfaces configuration"
        state=$(ifquery --state)
        ifdown --all --exclude=lo
        ifup --exclude=lo $state
        log_action_end_msg $?
        ;;

    force-reload|restart)
        init_is_upstart && exit 1

        log_warning_msg "Running $0 $1 is deprecated because it may not re-enable some interfaces"
        log_action_begin_msg "Reconfiguring network interfaces"
        ifdown --all --exclude=lo
        ifup --all --exclude=lo && ifup_hotplug
        log_action_end_msg $?
        ;;

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

exit 0