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 ipcalc

################################################################################
# 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

__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS=

function __network_parse_confbr() {
    local br; local -a ifaces
    splitpair "$1" br ifaces
    array_split ifaces "$ifaces" ,

    __npc_destbr="$br"
    array_copy __npc_destifaces ifaces
}
function network_parse_confbr() {
    # network_parse_confbr "$confbr" br ifaces
    local __npc_destbr; local -a __npc_destifaces
    __network_parse_confbr "$1"

    set_var "${2:-br}" "$__npc_destbr"
    array_copy "${3:-ifaces}" __npc_destifaces
}

function network_format_confbr() {
    # network_format_confbr "$br" ifaces --> "br:ifaces"
    echo "$1:$(array_join "${2:-ifaces}" ,)"
}

function __network_parse_confip() {
    local tmpig iface gateway; local -a ipsuffixes
    splitfsep2 "$1" : tmpig ipsuffixes
    splitfsep "$tmpig" // iface gateway
    array_split ipsuffixes "$ipsuffixes" ,

    __npc_destiface="$iface"
    __npc_destgateway="$gateway"
    array_copy __npc_destipsuffixes ipsuffixes
}
function network_parse_confip() {
    # network_parse_confip "$confip" iface gateway ipsuffixes
    local __npc_destiface __npc_destgateway; local -a __npc_destipsuffixes
    __network_parse_confip "$1"

    set_var "${2:-iface}" "$__npc_destiface"
    set_var "${3:-gateway}" "$__npc_destgateway"
    array_copy "${4:-ipsuffixes}" __npc_destipsuffixes
}

function network_parse_ipsuffix() {
    # network_parse_ipsuffix "$ipsuffix" ip suffix
    splitfsep "$1" / "${2:-ip}" "${3:-suffix}"
}

function network_format_confip() {
    # network_format_confip "$iface" "$gateway" ipsuffixes --> "iface//gateway:ipsuffixes"
    local tmpig="$1${2:+//$2}"
    echo "${tmpig:+$tmpig:}$(array_join "${3:-ipsuffixes}" ,)"
}

function network_format_ipsuffix() {
    # network_format_ipsuffix "$ip" "$suffix" --> "ip:suffix"
    if [ "${1,,}" == "dhcp" ]; then
        echo "${1,,}"
    else
        echo "$1${2:+/$2}"
    fi
}

function __network_fix_confbrs() {
    local -a confbrs ifaces brs ips
    local confbr br iface

    # recenser les bridges et créer les tableaux __BR_ifaces
    for confbr in "${__nfc_confbrs[@]}"; do
        network_parse_confbr "$confbr" br ifaces
        array_addu brs "$br"
        eval "local -a ${br}_ifaces"
    done
    # puis constuire la liste des interfaces associées à chaque bridge
    for confbr in "${__nfc_confbrs[@]}"; do
        network_parse_confbr "$confbr" br ifaces
        array_extendu "${br}_ifaces" ifaces
    done
    # puis construire le tableau final
    array_new confbrs
    for br in "${brs[@]}"; do
        array_add confbrs "$(network_format_confbr "$br" "${br}_ifaces")"
    done

    array_copy __nfc_destconfbrs confbrs
}
function network_fix_confbrs() {
    # normaliser le tableau $1(=confbrs): fusionner les doublons
    local -a __nfc_confbrs __nfc_destconfbrs
    array_copy __nfc_confbrs "${1:-confbrs}"
    __network_fix_confbrs

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

function __network_fix_confips() {
    local -a confips ipsuffixes ifaces ips
    local confip iface gateway ip suffix mainip

    local mainiface="$1"

    # recenser les interfaces et créer les tableaux __IFACE_ipspecs
    for confip in "${__nfc_confips[@]}"; do
        network_parse_confip "$confip" iface gateway ipsuffixes
        [ -n "$iface" ] || iface="$mainiface"
        array_addu ifaces "$iface"
        eval "local ${iface}_gateway; local -a ${iface}_ipsuffixes"
    done
    # puis construire la liste des adresses IP associées à chaque interface
    for confip in "${__nfc_confips[@]}"; do
        network_parse_confip "$confip" iface gateway ipsuffixes
        [ -n "$iface" ] || iface="$mainiface"
        # si la passerelle a déjà été spécifiée, la récupérer
        local tmpgw="${iface}_gateway"
        [ -n "${!tmpgw}" ] && gateway="${!tmpgw}"
        # calculer l'adresse ip principale, pour pouvoir traiter le cas où
        # l'adresse ip principale est l'adresse de la passerelle.
        mainip=
        for ipsuffix in "${ipsuffixes[@]}"; do
            network_parse_ipsuffix "$ipsuffix" ip suffix
            if ! array_contains ips "$ip"; then
                [ -n "$suffix" ] || suffix=24
                if [ -z "$mainip" ]; then
                    [ -n "$gateway" ] || gateway="$(ipcalc_gateway "$ip" "$suffix")"
                    mainip="$ip"
                fi
                array_add "${iface}_ipsuffixes" "$(network_format_ipsuffix "$ip" "$suffix")"
                array_add ips "$ip"
            fi
        done
        [ "$gateway" == "$mainip" ] && gateway=
        # si l'adresse ip principale est obtenue par dhcp, il ne faut pas
        # spécifier la passerelle: elle sera fournie par le serveur DHCP.
        # Utiliser le marqueur "none" pour que la valeur ne soit pas modifiée.
        [ "${ipsuffixes[0]}" == "dhcp" ] && gateway=none
        set_var "${iface}_gateway" "$gateway"
    done
    # puis construire le tableau final
    array_new confips
    for iface in "${ifaces[@]}"; do
        gateway="${iface}_gateway"; gateway="${!gateway}"
        [ "$gateway" == "none" ] && gateway=
        array_add confips "$(network_format_confip "$iface" "$gateway" "${iface}_ipsuffixes")"
    done

    array_copy __nfc_destconfips confips
}
function network_fix_confips() {
    # normaliser le tableau $1(=confips): fusionner les doublons, spécifier le
    # suffixe /24 par défaut, etc. $2 est le cas échéant l'interface associée
    # aux adresses ip non qualifiées
    local -a __nfc_confips __nfc_destconfips
    array_copy __nfc_confips "${1:-confips}"
    __network_fix_confips "$2"

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

function __network_fix_mainiface() {
    local -a confips ifaces ipsuffixes
    local br iface gateway confip mainconfip

    local mainiface="$1"

    # déterminer mainiface
    if [ -z "$mainiface" -a -n "${__nfm_confbrs[0]}" ]; then
        network_parse_confbr "${__nfm_confbrs[0]}" br ifaces
        mainiface="$br"
    fi
    if [ -z "$mainiface" -a -n "${__nfm_confips[0]}" ]; then
        network_parse_confip "${__nfm_confips[0]}" iface gateway ipsuffixes
        mainiface="$iface"
    fi
    [ -n "$mainiface" ] || mainiface=eth0

    # ensuite, il faut reécrire confips avec la valeur de mainiface
    array_new confips
    for confip in "${__nfm_confips[@]}"; do
        network_parse_confip "$confip" iface gateway ipsuffixes
        [ -n "$iface" ] || iface="$mainiface"
        confip="$(network_format_confip "$iface" "$gateway" ipsuffixes)"
        if [ "$iface" == "$mainiface" ]; then
            mainconfip="$confip"
        else
            array_add confips "$confip"
        fi
    done
    [ -n "$mainconfip" ] && array_ins confips "$mainconfip"

    array_copy __nfm_destconfips confips
}
function network_fix_mainiface() {
    # A partir des valeurs des tableaux $1(=confbrs) et $2(=confips), et de
    # l'interface principale $3, déterminer l'interface principale. Si $3 est
    # spécifié, c'est la valeur sélectionnée. Sinon, si un bridge existe, c'est
    # le premier bridge qui est sélectionné. Sinon, la première interface est
    # sélectionnée. Sinon, on prend eth0.
    # Ensuite, réorganiser les tableaux de façon que confips[0] devienne la
    # configuration ip de l'interface principale.
    local -a __nfm_confbrs __nfm_confips __nfm_destconfips
    array_copy __nfm_confbrs "${1:-confbrs}"
    array_copy __nfm_confips "${2:-confips}"
    __network_fix_mainiface "$3"

    array_copy "${2:-confips}" __nfm_destconfips
}

function network_fix_confs() {
    network_fix_confbrs "${1:-confbrs}"
    network_fix_confips "${2:-confips}"
    network_fix_mainiface "${1:-confbrs}" "${2:-confips}" "$3"
}

function __network_valid_ifaces() {
    ip link | awk '/<.*>/ {
  flags = $0; sub(/^.*</, ",", flags); sub(/>.*$/, ",", flags)
  if (flags ~ /,LOOPBACK,/) next
  if (flags !~ /,UP,/) next
  sub(/:$/, "", $2); print $2
}'
}

function __network_set_confbrs() {
    local -a ifaces tmpconfbrs confbrs
    local confbr br iface
    array_from_lines ifaces "$(__network_valid_ifaces)"
    array_from_lines tmpconfbrs "$(brctl show 2>/dev/null | awk '
BEGIN { confbrs = "" }
NR == 1 { next }
{
  if ($1 != "" && $2 != "") {
    if (confbr != "") print confbr
    confbr = $1 ":" $4
  } else {
    confbr = confbr "," $1
  }
}
END {
    if (confbr != "") print confbr
}
')"
    for confbr in "${tmpconfbrs[@]}"; do
        splitpair "$confbr" br iface
        array_contains ifaces "$br" || continue
        array_add confbrs "$confbr"
    done

    array_copy __nsc_destconfbrs confbrs
}
function network_set_confbrs() {
    # initialiser $1(=confbrs) avec l'état des bridges sur le système courant
    local -a __nsc_destconfbrs
    __network_set_confbrs

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

function __network_set_gateway() {
    # initialiser la variable gateway avec la passerelle associée à l'interface
    # $1
    gateway="$(route -n | awk -v iface="$1" '$1 == "0.0.0.0" && $8 == iface { print $2 }')"
}
function __network_set_confip() {
    # initialiser la variable confip avec l'état de l'interface $1, en assumant
    # que la passerelle vaut $2.
    # retourner 1 si l'interface n'a pas d'adresse ip associée
    local -a ipsuffixes
    array_from_lines ipsuffixes "$(ip addr show dev "$1" | awk '$1 == "inet" { print $2 }')"
    confip="$(network_format_confip "$1" "$2" ipsuffixes)"
    [ "${#ipsuffixes[*]}" -gt 0 ]
}
function __network_set_confips() {
    local -a confips ifaces
    local iface gateway
    array_from_lines ifaces "$(__network_valid_ifaces)"
    for iface in "${ifaces[@]}"; do
        __network_set_gateway "$iface"
        __network_set_confip "$iface" "$gateway" || continue
        array_add confips "$confip"
    done

    array_copy __nsc_destconfips confips
}
function network_set_confips() {
    # initialiser le tableau $1(=confips) avec l'état des interfaces sur le
    # système courant
    local -a __nsc_destconfips
    __network_set_confips

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

function __network_interfaces_check_confbr() {
    awkrun <"$nifile" -f br="$br" ifaces[@]=__nicc_ifaces '
BEGIN {
  array_new(iface_have_autos)
  array_new(iface_have_hotplugs)
  array_new(iface_have_manuals)
  for (i = 1; i <= ifaces_count; i++) {
    iface_have_autos[i] = 0
    iface_have_hotplugs[i] = 0
    iface_have_manuals[i] = 0
  }
  br_have_auto = 0
  br_have_hotplug = 0
  have_br = 0
}
function get_iface_index(iface,                 i) {
  for (i = 1; i <= ifaces_count; i++) {
    if (ifaces[i] == iface) return i
  }
  return 0
}

$1 ~ /^(allow-)?auto$/ {
  for (j = 2; j <= NF; j++) {
    i = get_iface_index($j)
    if (i != 0) iface_have_autos[i] = 1
    if ($i == br) br_have_auto = 1
  }
}
$1 == "allow-hotplug" {
  for (j = 2; j <= NF; j++) {
    i = get_iface_index($j)
    if (i != 0) iface_have_hotplugs[i] = 1
    if ($i == br) br_have_hotplug = 1
  }
}
$1 == "iface" && $3 == "inet" && $4 == "manual" {
  i = get_iface_index($2)
  if (i != 0) iface_have_manuals[i] = 1
}
$1 == "iface" && $2 == br && $3 == "inet" {
  have_br = 1
}
END {
  check_auto_or_hotplug = br_have_auto || br_have_hotplug
  check_manuals = 1
  if (check_auto_or_hotplug) {
    for (i = 1; i <= ifaces_count; i++) {
      if (!iface_have_autos[i] && !iface_have_hotplugs[i]) {
        check_auto_or_hotplug = 0
        break
      }
      if (!iface_have_manuals[i]) {
        check_manuals = 0
        break
      }
    }
  }
  if (!check_auto_or_hotplug || !check_manuals || !have_br) {
    exit 1
  }
  exit 0
}
'
}
function network_interfaces_check_confbr() {
    # Vérifier que la configuration du bridge $1, dont les membres sont les
    # interfaces du tableau $2(=ifaces) est faite dans le fichier
    # $3(=/etc/network/interfaces)
    local -a __nicc_ifaces
    array_copy __nicc_ifaces "${2:-ifaces}"
    local br="$1" nifile="${3:-/etc/network/interfaces}"
    __network_interfaces_check_confbr
}

function __network_interfaces_check_confip() {
    awkrun <"$nifile" -f iface="$iface" gateway="$gateway" ipsuffixes[@]=__nicc_ipsuffixes '
BEGIN {
  have_auto = 0
  have_hotplug = 0
  have_iface = 0
  have_method = 0 # static ou dhcp
  have_gateway = ipsuffixes[1] == "dhcp" || gateway == ""
  array_new(have_ips)
  array_new(have_ip_ups)
  array_new(have_ip_downs)
  for (i = 1; i <= ipsuffixes_count; i++) {
    have_ips[i] = 1
    have_ip_ups[i] = 0
    have_ip_downs[i] = 0
  }
  have_ips[1] = 0
  have_ip_ups[1] = 1
  have_ip_downs[1] = 1
  in_iface = 0
}
function get_ipsuffix_index(ipsuffix,                 i) {
  ip0 = ipsuffix; sub(/\/[0-9]+$/, "", ip0)
  for (i = 1; i <= ipsuffixes_count; i++) {
    # XXX ne pas comparer les suffixes pour le moment
    ipi = ipsuffixes[i]; sub(/\/[0-9]+$/, "", ipi)
    if (ipi == ip0) return i
  }
  return 0
}

$1 == "iface" && $2 == iface && $3 == "inet" {
  have_iface = 1
  if (ipsuffixes[1] == "dhcp") {
    have_method = $4 == "dhcp"
  } else {
    have_method = $4 == "static"
  }
  in_iface = 1
  next
}
in_iface && $1 == "gateway" && $2 == gateway {
  have_gateway = 1
  next
}
in_iface && $1 == "address" && get_ipsuffix_index($2) == 1 {
  have_ips[1] = 1
  next
}
in_iface && $0 ~ "^[ \\t]*(post-)?up (/sbin/)?ip addr add " {
  if (match($0, "ip addr add (.*/.*) dev " iface " ", vs) != 0) {
    i = get_ipsuffix_index(vs[1])
    if (i > 1) {
      have_ip_ups[i] = 1
    }
  }
  next
}
in_iface && $0 ~ "^[ \\t]*(pre-)?down (/sbin/)?ip addr del " {
  if (match($0, "ip addr del (.*/.*) dev " iface " ", vs) != 0) {
    i = get_ipsuffix_index(vs[1])
    if (i > 1) {
      have_ip_downs[i] = 1
    }
  }
  next
}
$1 == "iface" {
  in_iface = 0
  next
}
$1 ~ /^(allow-)?auto$/ {
  for (i = 2; i <= NF; i++) {
    if ($i == iface) {
      have_auto = 1
    }
  }
  in_iface = 0
  next
}
$1 == "allow-hotplug" {
  for (i = 2; i <= NF; i++) {
    if ($i == iface) {
      have_hotplug = 1
    }
  }
  in_iface = 0
  next
}

END {
  check_auto_or_hotplug = have_auto || have_hotplug
  check_iface = have_iface && have_method && have_gateway
  check_ips = 1
  for (i = 1; i <= ipsuffixes_count; i++) {
    if (!have_ips[i] || !have_ip_ups[i] || !have_ip_downs[i]) {
      check_ips = 0
      break
    }
  }
  if (!check_auto_or_hotplug || !check_iface || !check_ips) {
    exit 1
  }
  exit 0
}
'
}
function network_interfaces_check_confip() {
    # Vérifier que la configuration de l'interface $1, avec la passerelle $2,
    # avec les adresses IP du tabbleau $3(=ipsuffixes) est faite dans le fichier
    # $4(=/etc/network/interfaces)
    local -a __nicc_ipsuffixes
    array_copy __nicc_ipsuffixes "${3:-ipsuffixes}"
    local iface="$1" gateway="$2" nifile="${4:-/etc/network/interfaces}"
    __network_interfaces_check_confip
}

function __network_interfaces_remove_iface() {
    awkrun -f iface="$1" '
function match_iface(iface, line) {
  if (line == "") line = $0 " "
  return line ~ (" " iface " ")
}
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
  }
}
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
  }
}

BEGIN {
  in_iface = 0
  found_iface = 0
  modified = 0
}
!found_iface && $1 == "iface" && $2 == iface && $3 == "inet" {
  in_iface = 1
  found_iface = 1
  modified = 1
  next
}
$1 == "iface" {
  in_iface = 0
}
$1 ~ /^(allow-)?auto$/ {
  in_iface = 0
  if (match_iface(iface)) {
    print_auto_iface(remove_auto_iface(iface))
    modified = 1
    next
  }
}
$1 == "allow-hotplug" {
  in_iface = 0
  if (match_iface(iface)) {
    print_hotplug_iface(remove_hotplug_iface(iface))
    modified = 1
    next
  }
}
!in_iface { print }
END {
  if (modified) exit 0
  else exit 1
}'
}
function network_interfaces_remove_iface() {
    # Supprimer dans le fichier $2(=/etc/network/interfaces) toute la
    # configuration qui concerne l'interface $1
    local iface="$1" nifile="${2:-/etc/network/interfaces}"
    local tmpfile; ac_set_tmpfile tmpfile
    local modified
    if __network_interfaces_remove_iface "$iface" <"$nifile" >"$tmpfile"; then
        cat "$tmpfile" >"$nifile"
        modified=1
    fi
    ac_clean "$tmpfile"
    [ -n "$modified" ]
}
function network_interfaces_remove_ifaces() {
    # Supprimer dans le fichier $2(=/etc/network/interfaces) toute la
    # configuration qui concerne les interfaces du tableau $1=(ifaces)
    local -a __niri_ifaces; array_copy __niri_ifaces "${1:-ifaces}"
    local nifile="${2:-/etc/network/interfaces}"
    local workfile; ac_set_tmpfile workfile
    local tmpfile; ac_set_tmpfile tmpfile
    local iface modified
    cat "$nifile" >"$workfile"
    for iface in "${__niri_ifaces[@]}"; do
        if __network_interfaces_remove_iface "$iface" <"$workfile" >"$tmpfile"; then
            cat "$tmpfile" >"$workfile"
            modified=1
        fi
    done
    [ -n "$modified" ] && cat "$workfile" >"$nifile"
    ac_clean "$workfile" "$tmpfile"
    [ -n "$modified" ]
}

function network_interfaces_add_confbr() {
    :
}

function network_interfaces_add_confip() {
    :
}

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

function __old_network_hostname() {
    local hostname="${1%%.*}"
    [ -f /etc/hostname ] || touch /etc/hostname
    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        uecho "Setting /etc/hostname to $hostname"
    elif [ "$(</etc/hostname)" != "$hostname" ]; then
        __old_network_backup /etc/hostname
        if show_debug; then
            edebug "Setting /etc/hostname to $hostname"
        else
            estep /etc/hostname
        fi
        echo "$hostname" >/etc/hostname
    fi
}

function __old_network_mailname() {
    local host="$1"
    [ -f /etc/mailname ] || touch /etc/mailname
    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        uecho "Setting /etc/mailname to $host"
    elif [ "$(</etc/mailname)" != "$host" ]; then
        __old_network_backup /etc/mailname
        if show_debug; then
            edebug "Setting /etc/mailname to $host"
        else
            estep /etc/mailname
        fi
        echo "$host" >/etc/mailname
    fi
}

function __old_network_fix_exim4() {
    local host="$1" oldhost="$2"
    local tmpfile; ac_set_tmpfile tmpfile

    sed </etc/exim4/update-exim4.conf.conf >"$tmpfile" "
/^dc_other_hostnames=/c\\
dc_other_hostnames='$host'"
    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
        __old_network_backup /etc/exim4/update-exim4.conf.conf
        if show_debug; then
            edebug "Setting /etc/exim4/update-exim4.conf.conf to:"
            cat "$tmpfile" | sed 's/^/    /g' 1>&2
        else
            estep /etc/exim4/update-exim4.conf.conf
        fi
        cat "$tmpfile" >/etc/exim4/update-exim4.conf.conf
        update-exim4.conf
    fi
    ac_clean "$tmpfile"
}

function __old_network_fix_postfix() {
    local host="$1" oldhost="$2"
    local tmpfile; ac_set_tmpfile tmpfile

    awkrun </etc/postfix/main.cf >"$tmpfile" host="$host" oldhost="$oldhost" '
/^myhostname *=/ { $0 = "myhostname = " host }
/^mydestination *=/ {
  gsub(" *" oldhost " *,? *", "")
  if ($0 !~ (" *" host " *,? *")) {
    sub(/^mydestination *= */, "mydestination = " host ", ")
  }
}
{ print }'
    if [ -n "$__DEBIAN_NETWORK_DEVEL_SHOW_MODIFS" ]; then
        if testdiff "$tmpfile" /etc/postfix/main.cf; then
            uecho "Setting /etc/postfix/main.cf to:"
            cat "$tmpfile" | sed 's/^/    /g' 1>&2
        else
            uecho "/etc/postfix/main.cf: pas de modifications"
        fi
    elif testdiff "$tmpfile" /etc/postfix/main.cf; then
        __old_network_backup /etc/postfix/main.cf
        if show_debug; then
            edebug "Setting /etc/postfix/main.cf to:"
            cat "$tmpfile" | sed 's/^/    /g' 1>&2
        else
            estep /etc/postfix/main.cf
        fi
        cat "$tmpfile" >/etc/postfix/main.cf
    fi
    ac_clean "$tmpfile"
}

function __old_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
        __old_network_backup /etc/hosts
        if show_debug; then
            edebug "Setting /etc/hosts to:"
            cat "$tmpfile" | sed 's/^/    /g' 1>&2
        else
            estep /etc/hosts
        fi
        cat "$tmpfile" >/etc/hosts
    fi
    ac_clean "$tmpfile"
}

__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"
        mainip = ip
      }
    }
    if (suffix == "") suffix = "24"
    ips[i] = ip
    suffixes[i] = suffix
    gateways[i] = gateway
    have_ip_ups[i] = i == 1
    have_ip_downs[i] = i == 1
  }
}
'
__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"
        mainip = ip
      }
    }
    if (suffix == "") suffix = "24"
    ips[i] = ip
    suffixes[i] = suffix
    gateways[i] = gateway
    have_ip_ups[i] = i == 1
    have_ip_downs[i] = i == 1
  }
}
'

function __old_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])
    if (gateways[1] != "" && gateways[1] != ips[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 __old_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])
    if (gateways[1] != "" && gateways[1] != ips[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, c'est à dire
    # l'interface qui est sélectionnée si une adresse ip n'est pas préfixée de
    # son interface. En principe, l'interface principale est le premier bridge
    # défini ou la première interface définie.
    # $5 (reset_interfaces) spécifie de ne pas chercher à mettre à jour le
    # fichier /etc/network/interfaces, mais de le recréer depuis zéro.
    # 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

    __old_network_fix_confips confips
    __old_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

    __old_network_resolve_mainiface mainiface "${confbrs[0]}" "${confips[0]}"
    __old_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 "${confips[@]}"; do
            __old_network_parse_confip "$confip" iface
            array_addu ifaces_with_ips "$iface"
        done
        for confbr in "${confbrs[@]}"; do
            __old_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
            __old_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 "${confbrips[@]}"; do
            __old_network_parse_confip "$confip" br ipspecs
            [ -n "$br" ] || br="$mainbr"

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

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

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

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

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

            if __old_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
            __old_network_backup /etc/network/interfaces
            if show_debug; then
                edebug "Setting /etc/network/interfaces to:"
                cat "$interfaces" | sed 's/^/    /g' 1>&2
            else
                estep /etc/network/interfaces
            fi
            cat "$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

        __old_network_hostname "$host"
        __old_network_mailname "$host"
        if [ -n "$mainip" ]; then
            __old_network_hosts "$host" "$mainip"
        fi

        eend
    fi

    return 0
}