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* debian/mandos-client.README.Debian: Document network hook facility.
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
                                             interface selection
                                             algorithm.
  (OPTIONS/--interface): Refer to NETWORK HOOKS section.
  (OVERVIEW): Refer to password-prompt(8mandos) explicitly.
  (NETWORK HOOKS): New section.
  (FILES): Add "/lib/mandos/network-hooks.d".

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Lines of Context:
network-hooks.d/bridge
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# configuration file(s) should be copied into the
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# /etc/mandos/network-hooks.d directory.
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# 
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# Copyright © 2012-2018 Teddy Hogeborn
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# Copyright © 2012-2018 Björn Påhlsson
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# 
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# Copying and distribution of this file, with or without modification,
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# are permitted in any medium without royalty provided the copyright
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# notice and this notice are preserved.  This file is offered as-is,
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CONFIG="$MANDOSNETHOOKDIR/bridge.conf"
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addrtoif(){
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    grep -liFe "$1" /sys/class/net/*/address \
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        | sed -e 's,.*/\([^/]*\)/[^/]*,\1,' -e "/^${BRIDGE}\$/d"
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}
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# Read config file, which must set "BRIDGE", "PORT_ADDRESSES", and
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# optionally "IPADDRS" and "ROUTES".
 
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# Read config file, which must set "BRIDGE", "PORTS", and optionally
 
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# "IPADDRS" and "ROUTES".
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if [ -e "$CONFIG" ]; then
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    . "$CONFIG"
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fi
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if [ -z "$BRIDGE" ] || [ -z "$PORT_ADDRESSES" ]; then
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    exit
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fi
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if [ -n "$DEVICE" ]; then
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    case "$DEVICE" in
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        *,"$BRIDGE"|*,"$BRIDGE",*|"$BRIDGE",*|"$BRIDGE") :;;
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        *) exit;;
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    esac
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fi
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brctl="/sbin/brctl"
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for b in "$brctl" /usr/sbin/brctl; do
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    if [ -e "$b" ]; then
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        brctl="$b"
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        break
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    fi
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done
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do_start(){
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    "$brctl" addbr "$BRIDGE"
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    for address in $PORT_ADDRESSES; do
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        interface=`addrtoif "$address"`
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        "$brctl" addif "$BRIDGE" "$interface"
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        ip link set dev "$interface" up
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    done
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    ip link set dev "$BRIDGE" up
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    sleep "${DELAY%%.*}"
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    if [ -n "$IPADDRS" ]; then
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        for ipaddr in $IPADDRS; do
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            ip addr add "$ipaddr" dev "$BRIDGE"
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        done
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    fi
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    if [ -n "$ROUTES" ]; then
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        for route in $ROUTES; do
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            ip route add "$route" dev "$BRIDGE"
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        done
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    fi
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}
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do_stop(){
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    ip link set dev "$BRIDGE" down
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    for address in $PORT_ADDRESSES; do
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        interface=`addrtoif "$address"`
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        ip link set dev "$interface" down
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        "$brctl" delif "$BRIDGE" "$interface"
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    done
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    "$brctl" delbr "$BRIDGE"
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}
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case "${MODE:-$1}" in
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    start|stop)
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        do_"${MODE:-$1}"
 
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if [ -z "$BRIDGE" -o -z "$PORTS" ]; then
 
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    exit
 
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fi
 
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if [ -n "$DEVICE" -a "$DEVICE" != "$BRIDGE" ]; then
 
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    exit
 
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fi
 
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case "$1" in
 
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    start)
 
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        brctl addbr "$BRIDGE"
 
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        for port in $PORTS; do
 
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            brctl addif "$BRIDGE" "$port"
 
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        done
 
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        ip link set up "$BRIDGE"
 
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        if [ -n "$IPADDRS" ]; then
 
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            for ipaddr in $IPADDRS; do
 
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                ip addr add "$ipaddr" dev "$BRIDGE"
 
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            done
 
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        fi
 
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        if [ -n "$ROUTES" ]; then
 
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            for route in $ROUTES; do
 
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                ip route add "$route" dev "$BRIDGE"
 
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            done
 
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        fi
 
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        ;;
 
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    stop)
 
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        ip link set down "$BRIDGE"
 
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        for port in $PORTS; do
 
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            brctl delif "$BRIDGE" "$port"
 
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        done
 
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        brctl delbr "$BRIDGE"
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        ;;
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    files)
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        echo /bin/ip
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        echo "$brctl"
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        ;;
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    modules)
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        echo bridge
 
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        echo /usr/bin/brctl
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        ;;
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esac