nutools/ulib/debian

##@cooked comments # -*- coding: utf-8 mode: sh -*- vim:sw=4:sts=4:et:ai:si:sta:fenc=utf-8
## Outils pour les distributions debian
##@cooked nocomments
##@require base
##@require sysinfos
##@require service
uprovide debian
urequire base sysinfos service

################################################################################
# Gestion des packages

function pkg_check() {
    # Vérifier que les packages sont installés sur le système
    local pkg status
    for pkg in "$@"; do
        status="$(LANG=C dpkg -s "$pkg" 2>/dev/null | grep '^Status:')" || return 1
        [[ "$status" == *not-installed* ]] && return 1
        [[ "$status" == *deinstall* ]] && return 1
    done
    return 0
}

function pkg_update() {
    # Mettre à jour la liste des packages silencieusement sans confirmation
    LANG=C apt-get update -qy
}

function pkg_upgrade() {
    # Mettre à jour la liste des packages silencieusement sans confirmation
    LANG=C apt-get upgrade -qy
}

function pkg_install() {
    # Installer les packages silencieusement et sans confirmation
    LANG=C apt-get install -qy "$@"
}

function pkg_installm() {
    # Installer les packages silencieusement et sans confirmation
    # Retourner 0 si au moins un des packages a été installé. Sinon, les
    # packages n'ont pas été installés, soit parce qu'ils sont déjà installé,
    # soit parce qu'il y a eu une erreur.
    if ! pkg_check "$@"; then
        # essayer d'installer les packages
        pkg_install "$@"
    else
        # aucun package n'a été installé
        return 1
    fi
}

################################################################################
# Gestion des services

function service_disable() {
    # Désactiver le service $1 pour qu'il ne se lance pas automatiquement au
    # démarrage
    update-rc.d -f "$1" remove
}

function service_enable() {
    # Activer le service $1 pour qu'il se lance automatiquement au démarrage
    update-rc.d "$1" defaults
}

################################################################################
# Gestion des interfaces réseau

function network_create_bridge() {
    # Modifier le fichier /etc/network/interfaces pour créer un nouveau pont
    # nommé $1 avec les paramètres $2. Si $2 est vide, sa valeur par défaut est
    #     bridge_ports none
    #     bridge_stp off
    #     bridge_fd 2
    #     bridge_maxwait 0

    # OPTIONS:
    #     --static    L'interface est statique plutôt que de recevoir son
    #                 adresse par DHCP
    #     --auto      Démarrer l'interface automatiquement
    # Une définition existante de l'interface n'est jamais écrasée.
    # Retourner vrai si la définition a été ajoutée dans /etc/network/interfaces
    local args method auto ifname lines
    method=dhcp
    parse_opts \
        --static method=static \
        --auto auto \
        @ args -- "$@" && set -- "${args[@]}" || {
        eerror "$args"
        return 1
    }
    ifname="${1:-br0}"
    array_from_lines lines "$2"
    lines="$(array_to_lines lines "" "    ")"
    doinplacef /etc/network/interfaces awkrun ifname="$ifname" lines="$lines" method="$method" auto="$auto" '
BEGIN {
  foundif = 0
}
$0 ~ "^iface " ifname " " { foundif = 1 }
{ print }
END {
  if (foundif) {
    exit 1
  } else {
    print ""
    if (auto != "") print "auto " ifname
    print "iface " ifname " inet " method
    if (lines != "") print lines
    exit 0
  }
}'
}

__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS=

function __network_backup() {
    local file="$1"
    local backup="$file.orig$(date +%Y%m%d)"
    [ -f "$backup" ] || cat "$file" >"$backup" 2>/dev/null
}

function __network_hostname() {
    local hostname="${1%%.*}"
    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        uecho "Setting /etc/hostname to $hostname"
    else
        __network_backup /etc/hostname
        echo "$hostname" >/etc/hostname
    fi
}

function __network_mailname() {
    local host="$1"
    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        uecho "Setting /etc/mailname to $host"
    else
        __network_backup /etc/mailname
        echo "$host" >/etc/mailname
    fi
}

function __network_fix_exim4() {
    local host="$1"
    local tmpfile; ac_set_tmpfile tmpfile

    </etc/exim4/update-exim4.conf.conf sed '/^dc_other_hostnames=/c\
'"dc_other_hostnames='$host'" >"$tmpfile"
    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        if testdiff "$tmpfile" /etc/exim4/update-exim4.conf.conf; then
            uecho "Setting /etc/exim4/update-exim4.conf.conf to:"
            cat "$tmpfile" | sed 's/^/    /g' 1>&2
        else
            uecho "/etc/exim4/update-exim4.conf.conf: pas de modifications"
        fi
    elif testdiff "$tmpfile" /etc/exim4/update-exim4.conf.conf; then
        __network_backup /etc/exim4/update-exim4.conf.conf
        cat "$tmpfile" >/etc/exim4/update-exim4.conf.conf
        update-exim4.conf
    fi
    ac_clean "$tmpfile"
}

function __network_hosts() {
    local host="$1" hostname="${1%%.*}" ip="$2"
    local shost="${host//./\\.}"
    local tmpfile; ac_set_tmpfile tmpfile
    awkrun </etc/hosts >"$tmpfile" host="$host" hostname="$hostname" ip="$ip" '
/^[^# \t]/ {
  gsub("[ \\t]+" host "[ \\t]*", " ")
  gsub("[ \\t]+" hostname "[ \\t]*", " ")
  if ($0 ~ /^[^ \t]+[ \t]*$/) next
  gsub(/[ \t]*$/, "")
}
{ print }'
    local sip="${ip//./\\.}" shost="${host//./\\.}"
    if ! quietgrep "^$sip[ $TAB]\\+$shost[ $TAB]\\+$hostname" "$tmpfile"; then
        sed -i "/^$sip[ $TAB]/d" "$tmpfile"
        sed -i "1i\\
$ip$TAB$host $hostname" "$tmpfile"
    fi

    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        if testdiff "$tmpfile" /etc/hosts; then
            uecho "Setting /etc/hosts to:"
            cat "$tmpfile" | sed 's/^/    /g' 1>&2
        else
            uecho "/etc/hosts: pas de modifications"
        fi
    elif testdiff "$tmpfile" /etc/hosts; then
        __network_backup /etc/hosts
        cat "$tmpfile" >/etc/hosts
    fi
    ac_clean "$tmpfile"
}

function __network_parse_confip() {
    # confip --> iface [ipspecs@] [ipspecs]
    local __npc_tmp
    splitfsep2 "$1" : "${2:-iface}" __npc_tmp
    [ -n "$3" ] && array_split "$3" "$__npc_tmp" ,
    [ -n "$4" ] && set_var "$4" "$__npc_tmp"
}

function __network_parse_ipspec() {
    # ipspec --> ip suffix gateway
    local __npi_tmp
    splitfsep "$1" / "${2:-ip}" __npi_tmp
    splitfsep "$__npi_tmp" + "${3:-suffix}" "${4:-gateway}"
}

function __network_parse_confbr() {
    # confbr --> br [ifaces@] [ifaces]
    local __npc_tmp
    splitfsep "$1" : "${2:-br}" __npc_tmp
    [ -n "$3" ] && array_split "$3" "$__npc_tmp" ,
    [ -n "$4" ] && set_var "$4" "$__npc_tmp"
}

function __network_fix_confips() {
    # confips@
    local -a __nfc_confips __nfc_ipspecs __nfc_ifaces __nfc_ips
    local __nfc_confip __nfc_iface __nfc_ipspec __nfc_ip __nfc_suffix __nfc_gateway __nfc_first

    array_copy __nfc_confips "${1:-confips}"
    # recenser les interfaces et créer les tableaux __IFACE_ipspecs
    for __nfc_confip in "${__nfc_confips[@]}"; do
        __network_parse_confip "$__nfc_confip" __nfc_iface __nfc_ipspecs
        array_addu __nfc_ifaces "$__nfc_iface"
        eval "local -a __nfc_${__nfc_iface}_ipspecs"
    done
    # puis constuire la liste des adresses IP associées à chaque interface
    for __nfc_confip in "${__nfc_confips[@]}"; do
        __network_parse_confip "$__nfc_confip" __nfc_iface __nfc_ipspecs
        for __nfc_ipspec in "${__nfc_ipspecs[@]}"; do
            __network_parse_ipspec "$__nfc_ipspec" __nfc_ip __nfc_suffix __nfc_gateway
            if ! array_contains __nfc_ips "$__nfc_ip"; then
                [ -n "$__nfc_suffix" ] || __nfc_suffix=24
                if [ -z "$__nfc_gateway" ] && array_isempty "__nfc_${__nfc_iface}_ipspecs"; then
                    # premier ipspec, il faut spécifier le gateway
                    __nfc_gateway="$(ipcalc_gateway "$__nfc_ip" "$__nfc_suffix")"
                fi

                eval "array_add __nfc_${__nfc_iface}_ipspecs \"$__nfc_ip/$__nfc_suffix${__nfc_gateway:++$__nfc_gateway}\""
                array_add __nfc_ips "$__nfc_ip"
            fi
        done
    done
    # puis construire le tableau final
    array_new __nfc_confips
    for __nfc_iface in "${__nfc_ifaces[@]}"; do
        array_add __nfc_confips "$__nfc_iface:$(array_join "__nfc_${__nfc_iface}_ipspecs" ,)"
    done

    array_copy "${1:-confips}" __nfc_confips
}

function __network_fix_confbrs() {
    # confbrs@
    local -a __nfc_confbrs __nfc_ifaces __nfc_brs __nfc_ips
    local __nfc_confbr __nfc_br __nfc_iface __nfc_ip __nfc_suffix __nfc_gateway

    array_copy __nfc_confbrs "${1:-confbrs}"
    # recenser les bridges et créer les tableaux __BR_ifaces
    for __nfc_confbr in "${__nfc_confbrs[@]}"; do
        __network_parse_confbr "$__nfc_confbr" __nfc_br __nfc_ifaces
        array_addu __nfc_brs "$__nfc_br"
        eval "local -a __nfc_${__nfc_br}_ifaces"
    done
    # puis constuire la liste des interfaces associées à chaque bridge
    for __nfc_confbr in "${__nfc_confbrs[@]}"; do
        __network_parse_confbr "$__nfc_confbr" __nfc_br __nfc_ifaces
        array_extendu "__nfc_${__nfc_br}_ifaces" __nfc_ifaces
    done
    # puis construire le tableau final
    array_new __nfc_confbrs
    for __nfc_br in "${__nfc_brs[@]}"; do
        array_add __nfc_confbrs "$__nfc_br:$(array_join "__nfc_${__nfc_br}_ifaces" ,)"
    done

    array_copy "${1:-confbrs}" __nfc_confbrs
}

function __network_resolve_mainiface() {
    local __nrm_mainiface="${1:-mainiface}" __nrm_mainconfbr="$2" __nrm_mainconfip="$3"
    [ -n "${!__nrm_mainiface}" ] || __network_parse_confbr "$__nrm_mainconfbr" "$__nrm_mainiface"
    [ -n "${!__nrm_mainiface}" ] || __network_parse_confip "$__nrm_mainconfip" "$__nrm_mainiface"
    [ -n "${!__nrm_mainiface}" ] || set_var "$__nrm_mainiface" eth0
}

function __network_set_mainip() {
    # XXX modifier pour en faire set_confips, qui initialise confips en fonction
    # des adresses actuelles, principale et supplémentaire
    eval "$(ip addr show dev "$1" | awk "BEGIN {
  mainipvar = \"${2:-mainip}\"
  suffixvar = \"${3:-suffix}\"
  broadcastvar = \"${4:-broadcast}\"
"'
  print mainipvar "="
  print suffixvar "="
  print broadcastvar "="
}
$1 == "inet" {
  mainip = ""; suffix = ""; broadcast = ""
  if (match($0, "inet ([^ ]*)/([^ ]*) ", vs) != 0) {
    mainip = vs[1]
    suffix = vs[2]
  }
  if (match($0, "brd ([^ ]*) ", vs) != 0) {
    broadcast = vs[1]
  }
  print mainipvar "=\"" mainip "\""
  print suffixvar "=\"" suffix "\""
  print broadcastvar "=\"" broadcast "\""
  exit 0
}')"
}

function __network_set_gateway() {
    eval "$(route -n | awk "BEGIN {
  iface = \"$1\"
  gatewayvar = \"${2:-gateway}\"
"'
  print gatewayvar "="
}
$1 == "0.0.0.0" && $8 == iface {
  print gatewayvar "=\"" $2 "\""
}')"
}
#BUG")"

__DEBIAN_NETWORK_UPDATE_BASE_SCRIPT='
BEGIN {
  method = "dhcp"
  array_new(have_iface_hotplugs)
  array_new(have_iface_autos)
  array_new(have_iface_manuals)
  array_new(ips)
  array_new(suffixes)
  array_new(gateways)
  array_new(have_ip_ups)
  array_new(have_ip_downs)
}
function indexof_iface(iface,            i) {
  for (i = 1; i <= ifaces_count; i++) {
    if (ifaces[i] == iface) {
      return i
    }
  }
  return 0
}
function indexof_ip(ip,            i) {
  for (i = 1; i <= ipspecs_count; i++) {
    if (ips[i] == ip) {
      return i
    }
  }
  return 0
}
function get_netmask(suffix) {
  if (suffix == 0) return "0.0.0.0"
  else if (suffix == 8) return "255.0.0.0"
  else if (suffix == 16) return "255.255.0.0"
  else if (suffix == 24) return "255.255.255.0"
  else if (suffix == 32) return "255.255.255.255"
  else return suffix
}
function remove_hotplug_iface(iface, line) {
  if (line == "") line = $0
  if (line !~ / $/) line = line " "
  gsub(" " iface " ", " ", line)
  return line
}
function print_hotplug_iface(line) {
  if (line ~ /^allow-hotplug *$/) {
    # une seule interface sur la ligne: ne pas l"afficher
  } else {
    # supprimer l"interface de la ligne
    sub(/ *$/, "", line)
    print line
  }
}
function remove_auto_iface(iface, line) {
  if (line == "") line = $0 " "
  gsub(" " iface " ", " ", line)
  return line
}
function print_auto_iface(line) {
  if (line ~ /^(allow-)?auto *$/) {
    # une seule interface sur la ligne: ne pas l"afficher
  } else {
    # supprimer l"interface de la ligne
    sub(/ *$/, "", line)
    print line
  }
}
'
__DEBIAN_NETWORK_UPDATE_BRIDGE_SCRIPT='
BEGIN {
  for (i = 1; i <= ifaces_count; i++) {
    have_iface_hotplugs[i] = 0
    have_iface_autos[i] = 0
    have_iface_manuals[i] = 0
  }
  for (i = 1; i <= ipspecs_count; i++) {
    if (match(ipspecs[i], "^([^/]*)(/([^+]*))?(\\+(.*))?$", vs) != 0) {
      ip = vs[1]
      suffix = vs[3]
      gateway = vs[5]
    } else {
      ip = ""
      suffix = ""
      gateway = ""
    }
    if (i == 1) {
      if (ip == "dhcp") method = "dhcp"
      else method = "static"
    }
    if (suffix == "") suffix = "24"
    ips[i] = ip
    suffixes[i] = suffix
    gateways[i] = gateway
    have_ip_ups[i] = 0
    have_ip_downs[i] = 0
  }
}
'
__DEBIAN_NETWORK_UPDATE_IFACE_SCRIPT='
BEGIN {
  for (i = 1; i <= ipspecs_count; i++) {
    if (match(ipspecs[i], "^([^/]*)(/([^+]*))?(\\+(.*))?$", vs) != 0) {
      ip = vs[1]
      suffix = vs[3]
      gateway = vs[5]
    } else {
      ip = ""
      suffix = ""
      gateway = ""
    }
    if (i == 1) {
      if (ip == "dhcp") method = "dhcp"
      else method = "static"
    }
    if (suffix == "") suffix = "24"
    ips[i] = ip
    suffixes[i] = suffix
    gateways[i] = gateway
    have_ip_ups[i] = 0
    have_ip_downs[i] = 0
  }
}
'

function __network_update_bridge() {
    # vérifier la configuration (interfaces de ifaces[@] en manual, présence du
    # bridge, bridge en auto, adresse ip principale statique ou en dhcp,
    # adresses ip supplémentaires), puis si nécessaire, supprimer l'ancienne
    # configuration et créer la nouvelle.
    local inf="$1"; shift
    local outf="$1"; shift
    awkrun <"$inf" -f iface="$1" ipspecs[@]="${2:-ipspecs}" ifaces[@]="${3:-ifaces}" '
BEGIN {
  have_hotplug = 0
  have_auto = 0
  have_iface = 0
  have_method = 0 # static ou dhcp
  in_iface = 0
  have_mainip = 0
}
'"
$__DEBIAN_NETWORK_UPDATE_BASE_SCRIPT
$__DEBIAN_NETWORK_UPDATE_BRIDGE_SCRIPT
"'

$1 == "iface" && $2 == iface && $3 == "inet" {
  have_iface = 1
  if (($0 " ") ~ (" " method " ")) have_method = 1
  in_iface = 1
  next
}
in_iface && ($0 " ") ~ "^[ \\t]*address " mainip " " { have_mainip = 1 }
in_iface && $0 ~ "^[ \\t]*up (/sbin/)?ip addr add " {
  if (match($0, "ip addr add (.*)/.* dev " iface, vs) != 0) {
    i = indexof_ip(vs[1])
    if (i != 0) have_ip_ups[i] = 1
  }
  next
}
in_iface && $0 ~ "^[ \\t]*down (/sbin/)?ip addr del " {
  if (match($0, "ip addr del (.*)/.* dev " iface, vs) != 0) {
    i = indexof_ip(vs[1])
    if (i != 0) have_ip_downs[i] = 1
  }
  next
}
$1 == "iface" {
  i = indexof_iface($2)
  if (i != 0 && $3 == "inet" && $4 == "manual") {
    have_iface_manuals[i] = 1
  }
  in_iface = 0
  next
}
$1 == "allow-hotplug" {
  if (($0 " ") ~ (" " iface " ")) have_hotplug = 1
  for (i = 1; i <= ifaces_count; i++) {
    if (($0 " ") ~ (" " ifaces[i] " ")) iface_have_hotplugs[i] = 1
  }
  in_iface = 0
  next
}
$1 ~ /^(allow-)?auto$/ {
  if (($0 " ") ~ (" " iface " ")) have_auto = 1
  for (i = 1; i <= ifaces_count; i++) {
    if (($0 " ") ~ (" " ifaces[i] " ")) have_iface_autos[i] = 1
  }
  in_iface = 0
  next
}

END {
  check_hotplug = !have_hotplug
  if (check_hotplug) for (i = 1; i <= ifaces_count; i++) {
    if (iface_have_hotplugs[i]) {
      check_hotplug = 0
      break
    }
  }
  check_auto = have_auto
  if (check_auto) for (i = 1; i <= ifaces_count; i++) {
    if (!have_iface_autos[i]) {
      check_auto = 0
      break
    }
  }
  check_iface = have_iface && have_method && have_mainip
  check_supplips = 1
  for (i = 1; i <= ipspecs_count; i++) {
    if (!have_ip_ups[i] || !have_ip_downs[i]) {
      check_supplips = 0
      break
    }
  }

  if (!check_hotplug || !check_auto || !check_iface || !check_supplips) {
    exit 1 # il faut refaire la configuration
  }
  exit 0 # tout est ok
}
' && return 1

    # il faut refaire la configuration
    awkrun <"$inf" >"$outf" -f iface="$1" ipspecs[@]="${2:-ipspecs}" ifaces[@]="${3:-ifaces}" '
BEGIN {
  have_auto = 0
  remove_auto = 0
  array_new(remove_iface_autos)
  for (i = 1; i <= ifaces_count; i++) {
    remove_iface_autos[i] = 0
  }
  replace_conf = 1
  in_iface = 0
  found_iface = 0
  remove_old_iface = 0
}
'"
$__DEBIAN_NETWORK_UPDATE_BASE_SCRIPT
$__DEBIAN_NETWORK_UPDATE_BRIDGE_SCRIPT
"'
function write_conf() {
  replace_conf = 0

  for (i = 1; i <= ifaces_count; i++) {
    printed = 0
    if (!have_iface_autos[i]) {
      print "auto " ifaces[i]
      printed = 1
    }
    if (!have_iface_manuals[i]) {
      print "iface " ifaces[i] " inet manual"
      printed = 1
    }
    if (printed) print ""
  }

  if (!have_auto) print "auto " iface
  print "iface " iface " inet " method
  if (ipspecs_count > 0 && method == "static") {
    print "    address " ips[1]
    print "    netmask " get_netmask(suffixes[1])
    print "    gateway " gateways[1]
  }
  ports = "    bridge_ports"
  if (ifaces_count == 0) {
    ports = ports " none"
  } else {
    for (i = 1; i <= ifaces_count; i++) {
      ports = ports " " ifaces[i]
    }
  }
  print ports
  print "    bridge_stp off"
  print "    bridge_fd 2"
  print "    bridge_maxwait 0"
  serial = 0
  for (i = 2; i <= ipspecs_count; i++) {
    print "    up ip addr add " ips[i] "/" suffixes[i] " dev " iface " label " iface ":" serial
    print "    down ip addr del " ips[i] "/" suffixes[i] " dev " iface " label " iface ":" serial
    serial++
  }
  print ""
}

remove_old_iface && $1 == "iface" {
  remove_old_iface = 0
}
!remove_old_iface && replace_conf && !in_iface && $1 == "iface" && $2 == iface && $3 == "inet" {
  in_iface = 1
  found_iface = 1
  next
}
!remove_old_iface && $1 == "iface" {
  in_iface = 0
  for (i = 1; i <= ifaces_count; i++) {
    if ($2 == ifaces[i]) {
      if ($3 == "inet" && $4 == "manual") {
        have_iface_manuals[i] = 1
        break
      } else {
        remove_old_iface = 1
      }
    }
  }
  if (replace_conf && found_iface) write_conf()
  if (!remove_old_iface) print
  next
}
$1 == "allow-hotplug" {
  in_iface = 0
  remove_old_iface = 0
  if (replace_conf && found_iface) write_conf()

  line = $0
  if (($0 " ") ~ (" " iface " ")) line = remove_hotplug_iface(iface, line)
  for (i = 1; i <= ifaces_count; i++) {
    if (($0 " ") ~ (" " ifaces[i] " ")) line = remove_hotplug_iface(ifaces[i], line)
  }
  print_hotplug_iface(line)
  next
}
$1 ~ /(allow-)?auto/ {
  in_iface = 0
  remove_old_iface = 0
  if (replace_conf && found_iface) write_conf()

  line = $0
  if (($0 " ") ~ (" " iface " ")) {
    if (!remove_auto) {
      have_auto = 1
      remove_auto = 1
    } else {
      line = remove_auto_iface(iface, line)
    }
  }
  for (i = 1; i <= ifaces_count; i++) {
    if (($0 " ") ~ (" " ifaces[i] " ")) {
      if (!remove_iface_autos[i]) {
        have_iface_autos[i] = 1
        remove_iface_autos[i] = 1
      } else {
        line = remove_auto_iface(ifaces[i], line)
      }
    }
  }
  print_auto_iface(line)
  next
}
{ print }
END {
  if (replace_conf) write_conf()
}
'
    return 0
}

function __network_update_iface() {
    # vérifier la configuration (présence de l'interface, interface en auto,
    # adresse ip principale statique ou en dhcp, adresses ip supplémentaires),
    # puis si nécessaire, supprimer l'ancienne configuration et créer la
    # nouvelle.
    local inf="$1"; shift
    local outf="$1"; shift
    awkrun <"$inf" -f iface="$1" ipspecs[@]="${2:-ipspecs}" '
BEGIN {
  have_hotplug = 0
  have_auto = 0
  have_iface = 0
  have_method = 0 # static ou dhcp
  in_iface = 0
  have_mainip = 0
}
'"
$__DEBIAN_NETWORK_UPDATE_BASE_SCRIPT
$__DEBIAN_NETWORK_UPDATE_IFACE_SCRIPT
"'

$1 == "iface" && $2 == iface && $3 == "inet" {
  have_iface = 1
  if (($0 " ") ~ (" " method " ")) have_method = 1
  in_iface = 1
  next
}
in_iface && ($0 " ") ~ "^[ \\t]*address " mainip " " { have_mainip = 1 }
in_iface && $0 ~ "^[ \\t]*up (/sbin/)?ip addr add " {
  if (match($0, "ip addr add (.*)/.* dev " iface, vs) != 0) {
    i = indexof_ip(vs[1])
    if (i != 0) have_ip_ups[i] = 1
  }
  next
}
in_iface && $0 ~ "^[ \\t]*down (/sbin/)?ip addr del " {
  if (match($0, "ip addr del (.*)/.* dev " iface, vs) != 0) {
    i = indexof_ip(vs[1])
    if (i != 0) have_ip_downs[i] = 1
  }
  next
}
$1 == "iface" { in_iface = 0; next; }
$1 == "allow-hotplug" {
  if (($0 " ") ~ (" " iface " ")) have_hotplug = 1
  in_iface = 0
  next
}
$1 ~ /^(allow-)?auto$/ {
  if (($0 " ") ~ (" " iface " ")) have_auto = 1
  in_iface = 0
  next
}

END {
  check_hotplug = !have_hotplug
  check_auto = have_auto
  check_iface = have_iface && have_method && have_mainip
  check_supplips = 1
  for (i = 1; i <= ipspecs_count; i++) {
    if (!have_ip_ups[i] || !have_ip_downs[i]) {
      check_supplips = 0
      break
    }
  }

  if (!check_hotplug || !check_auto || !check_iface || !check_supplips) {
    exit 1 # il faut refaire la configuration
  }
  exit 0 # tout est ok
}
' && return 1

    # il faut refaire la configuration
    awkrun <"$inf" >"$outf" -f iface="$1" ipspecs[@]="${2:-ipspecs}" '
BEGIN {
  have_auto = 0
  remove_auto = 0
  replace_conf = 1
  in_iface = 0
  found_iface = 0
}
'"
$__DEBIAN_NETWORK_UPDATE_BASE_SCRIPT
$__DEBIAN_NETWORK_UPDATE_IFACE_SCRIPT
"'
function write_conf() {
  replace_conf = 0
  if (!have_auto) print "auto " iface
  print "iface " iface " inet " method
  if (ipspecs_count > 0 && method == "static") {
    print "    address " ips[1]
    print "    netmask " get_netmask(suffixes[1])
    print "    gateway " gateways[1]
  }
  serial = 0
  for (i = 2; i <= ipspecs_count; i++) {
    print "    up ip addr add " ips[i] "/" suffixes[i] " dev " iface " label " iface ":" serial
    print "    down ip addr del " ips[i] "/" suffixes[i] " dev " iface " label " iface ":" serial
    serial++
  }
  print ""
}

($0 " ") ~ ("^allow-hotplug.* " iface " ") { print_hotplug_iface(remove_hotplug_iface(iface)); next; }
!remove_auto && ($0 " ") ~ ("^(allow-)?auto.* " iface " ") { have_auto = 1; remove_auto = 1; next; }
remove_auto && ($0 " ") ~ ("^(allow-)?auto.* " iface " ") { print_auto_iface(remove_auto_iface(iface)); next; }
replace_conf && !in_iface && $0 ~ ("^iface " iface " inet ") { in_iface = 1; found_iface = 1; next; }
replace_conf && found_iface && in_iface && $0 ~ "^iface " { print; in_iface = 0; write_conf(); next; }
{ print }
END {
  if (replace_conf) write_conf()
}
'
    return 0
}

function network_config() {
    # (Re)configurer le réseau sur l'hôte courant.
    # $1 (host) est le nom d'hôte. $2 (confips) est le nom d'un tableau
    # contenant la configuration des adresses ips pour les interfaces. $3
    # (confbrs) est le nom d'un tableau contenant la configuration des bridges à
    # créer/mettre à jour. $4 (mainiface) est le nom de l'interface
    # principale. En principe, l'interface principale est le premier bridge
    # défini ou la première interface définie.
    # Si un des arguments n'est pas spécifié, il est ignoré.
    # Le tableau confips doit contenir des définitions d'une des formes
    # suivantes:
    #     [iface:]address[/suffix][+gateway],...
    #     [iface:]dhcp
    # La deuxième forme est pour spécifier qu'une interface est configurée par
    # DHCP. iface vaut par défaut eth0, sauf si une définition de bridge
    # existe, auquel cas il s'agit du premier bridge défini. Pour chaque
    # interface, seule la première spécification d'adresse IP tient compte de
    # l'argument gateway. Les autres spécifications définissent des adresses IP
    # supplémentaires pour l'interface.
    # Le tableau brs doit contenir des définitions de la forme suivante:
    #     br:ifaces,...
    # br est le nom du bridge, e.g. br0. ifaces est une liste d'interfaces
    # séparées par une virgule. e.g. br0:eth0,eth1
    # Bien que ce soit techniquement possible, ce script interdit que l'on
    # définisse une adresse IP pour une interface faisant partie d'un bridge.
    urequire ipcalc conf

    local -a __nc_confips __nc_confbrs
    [ -n "$2" ] && array_copy __nc_confips "$2"
    [ -n "$3" ] && array_copy __nc_confbrs "$3"

    local host="$1" mainiface="$4" reset_interfaces="$5"
    local -a confips confbrs
    array_copy confips __nc_confips
    array_copy confbrs __nc_confbrs

    __network_fix_confips confips
    __network_fix_confbrs confbrs

    local mainbr # bridge principal
    local mainip # adresse IP principale de l'interface principale
    local confbr confip br iface suffix gateway
    local -a ipspecs

    __network_resolve_mainiface mainiface "${confbrs[0]}" "${confips[0]}"
    __network_parse_confbr "${confbrs[0]}" mainbr
    [ -n "$mainbr" ] || mainbr=br0

    if [ -n "${confips[*]}" -o -n "${confbrs[*]}" ]; then
        # Vérifier qu'une interface avec une adresse IP ne figure pas dans les
        # bridges à configurer. en profiter pour classer les interfaces par
        # type: standard et bridges
        etitle "Configuration des interfaces réseau"

        local -a ifaces_with_ips ifaces
        local -a brifaces
        ifaces_with_ips=()
        for confip in "${confips[@]}"; do
            __network_parse_confip "$confip" iface
            array_addu ifaces_with_ips "$iface"
        done
        for confbr in "${confbrs[@]}"; do
            __network_parse_confbr "$confbr" br ifaces
            array_add brifaces "$br"
            for iface in "${ifaces[@]}"; do
                if array_contains ifaces_with_ips "$iface"; then
                    eerror "$iface: Impossible de configurer une interface dans un bridge ET avec une adresse IP"
                    return 1
                fi
            done
        done
        local -a confstdips confbrips
        for confip in "${confips[@]}"; do
            __network_parse_confip "$confip" iface
            [ -n "$iface" ] || iface="$mainiface"
            if array_contains brifaces "$iface"; then
                array_add confbrips "$confip"
            else
                array_add confstdips "$confip"
            fi
        done

        # maintenant, configurer /etc/network/interfaces: faire une copie de travail
        local interfaces workfile
        ac_set_tmpfile interfaces
        ac_set_tmpfile workfile
        cat /etc/network/interfaces >"$interfaces"

        if [ -n "$reset_interfaces" ]; then
            echo >"$interfaces" "\
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback
"
        fi

        # configurer chaque bridge
        local -a tmpifaces
        local tmpbr
        for confip in "${confbrips[@]}"; do
            __network_parse_confip "$confip" br ipspecs
            [ -n "$br" ] || br="$mainbr"

            if [ -z "$mainip" -a "$br" == "$mainiface" ]; then
                __network_parse_ipspec "${ipspecs[0]}" mainip suffix gateway
            fi

            ifaces=()
            for confbr in "${confbrs[@]}"; do
                __network_parse_confbr "$confbr" tmpbr tmpifaces
                if [ "$tmpbr" == "$br" ]; then
                    array_copy ifaces tmpifaces
                    break
                fi
            done

            if __network_update_bridge "$interfaces" "$workfile" "$br" ipspecs ifaces; then
                cat "$workfile" >"$interfaces"
            fi
        done

        # configurer chaque interface classique
        for confip in "${confstdips[@]}"; do
            __network_parse_confip "$confip" iface ipspecs
            [ -n "$iface" ] || iface="$mainiface"

            if [ -z "$mainip" -a "$iface" == "$mainiface" ]; then
                __network_parse_ipspec "${ipspecs[0]}" mainip suffix gateway
            fi

            if __network_update_iface "$interfaces" "$workfile" "$iface" ipspecs; then
                cat "$workfile" >"$interfaces"
            fi
        done

        # Fin de traitement
        if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
            if testdiff "$interfaces" /etc/network/interfaces; then
                uecho "Setting /etc/network/interfaces to:"
                cat "$interfaces" | sed 's/^/    /g' 1>&2
            else
                uecho "/etc/network/interfaces: pas de modifications"
            fi
        elif testdiff "$interfaces" /etc/network/interfaces; then
            __network_backup /etc/network/interfaces
            cat "$interfaces" >/etc/network/interfaces
        fi
        ac_clean "$interfaces" "$workfile"

        eend
    fi

    # configurer le nom d'hôte
    if [ -n "$host" ]; then
        host="$(ipcalc_fqdn_maybe "$host")"
        etitle "Configuration du nom d'hôte: $host"

        # si on ne spécifie pas l'adresse ip principale, la résoudre ici. ceci
        # est nécessaire pour mettre à jour /etc/hosts
        if [ "$mainip" == dhcp ]; then
            # si l'adresse obtenue est en DHCP, ne pas mettre à jour /etc/hosts
            mainip=
        elif [ -z "$mainip" ]; then
            local -a mainips
            resolv_ips mainips "$host"
            [ -n "${mainips[*]}" ] || {
                eerror "$host: Impossible de résoudre ce nom d'hôte"
                return 1
            }
            mainip="${mainips[0]}"
        fi

        estep "/etc/hostname"
        __network_hostname "$host"
        estep "/etc/mailname"
        __network_mailname "$host"
        if [ -f "/etc/exim4/update-exim4.conf.conf" ]; then
            estep "/etc/exim4/update-exim4.conf.conf"
            __network_fix_exim4 "$host"
        fi
        # XXX tester la présence de postfix, et si nécessaire, modifier la
        # configuration
        if [ -n "$mainip" ]; then
            estep "/etc/hosts"
            __network_hosts "$host" "$mainip"
        fi

        eend
    fi

    return 0
}