Add a generic installer that asks for the basics and builds offline
The installer ISO no longer needs a prebuilt system: `router-setup` asks for the disk, the WAN and LAN interfaces, DHCP or PPPoE (optionally on a VLAN), host name, LAN address and a password, writes settings.json and the secrets, builds that router offline (the ISO carries a reference router system whose closure has everything the build needs) and installs it with `router-install --system`. The password is used for the web UI and, hashed, as root's console password (routerSettings sets root's hashedPasswordFile; it applies when the account is created at installation). checks.setup answers router-setup on the console and checks the installed box: its settings, the web UI and console login with that password, and a rebuild that reproduces the installed system. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AeFqV9dZrK6nipHkPfyM4F
This commit is contained in:
Claude Opus 5.5
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# `router-setup`: the generic installer. Asks for the basics on the console
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# (disk, uplink and LAN interfaces, PPPoE credentials, LAN address, web UI
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# password), writes them as settings.json, builds that router on the spot
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# (offline: the closure of `reference` brings the sources and everything the
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# build needs) and installs it with `router-install`. Everything else is done
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# in the web UI afterwards.
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{
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config,
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lib,
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pkgs,
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...
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}:
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let
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cfg = config.router.setup;
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webui = pkgs.callPackage ../../pkgs/router-webui/package.nix { };
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setup = pkgs.writeShellApplication {
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name = "router-setup";
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runtimeInputs = [
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config.nix.package
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webui
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pkgs.coreutils
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pkgs.gawk
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pkgs.gnugrep
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pkgs.jq
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pkgs.mkpasswd
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pkgs.util-linux
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"/run/current-system/sw"
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];
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text = ''
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usage() {
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echo "usage: router-setup [--local FILE]" >&2
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echo " Asks a few questions, then ERASES the chosen disk and installs the router." >&2
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echo " --local FILE extra NixOS module for this box (installed as config/local.nix)" >&2
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exit 2
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}
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local_nix=""
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while [ $# -gt 0 ]; do
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case $1 in
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--local) shift; [ $# -gt 0 ] || usage; local_nix=$1 ;;
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*) usage ;;
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esac
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shift
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done
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[ "$(id -u)" -eq 0 ] || { echo "router-setup: must run as root" >&2; exit 1; }
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# ask VAR PROMPT [DEFAULT]
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# (Their locals must not share a name with the caller's variable.)
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ask() {
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local reply
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read -r -p "$2''${3:+ [$3]}: " reply || { echo; echo "aborted" >&2; exit 1; }
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printf -v "$1" '%s' "''${reply:-''${3:-}}"
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}
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ask_secret() {
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local reply
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read -r -s -p "$2: " reply || { echo; echo "aborted" >&2; exit 1; }
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echo >&2
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printf -v "$1" '%s' "$reply"
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}
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# choose VAR PROMPT ITEM...: by number or by name
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choose() {
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local var=$1 prompt=$2 pick="" i
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shift 2
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while :; do
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i=1
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for item in "$@"; do echo " $i) $item" >&2; i=$((i + 1)); done
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ask pick "$prompt"
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if [[ $pick =~ ^[0-9]+$ ]] && [ "$pick" -ge 1 ] && [ "$pick" -le $# ]; then
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pick=''${!pick}
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pick=''${pick%% *}
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fi
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for item in "$@"; do
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if [ "''${item%% *}" = "$pick" ]; then
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printf -v "$var" '%s' "$pick"
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return
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fi
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done
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echo " please pick one of the above" >&2
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done
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}
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ipv4_ok() {
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[[ $1 =~ ^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$ ]] || return 1
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for o in "''${BASH_REMATCH[@]:1}"; do [ "$o" -le 255 ] || return 1; done
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}
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# Set by ask/choose (printf -v).
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disk="" wan="" lan="" wan_type="" host="" lan_address="" ssh_key="" answer=""
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webui_password="" webui_password2=""
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echo
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echo "nixos-router setup"
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echo "=================="
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echo "A few questions; everything else can be changed later in the web UI."
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echo
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# Disks, without the medium this installer runs from.
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boot_disk=""
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if src=$(findmnt -no SOURCE /iso 2>/dev/null) && [ -n "$src" ]; then
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boot_disk=/dev/$(lsblk -no PKNAME "$src" | head -n1)
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fi
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mapfile -t disks < <(lsblk -dnpo NAME,SIZE,MODEL,TYPE | awk '$NF == "disk" { $NF = ""; print }' \
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| grep -v "^$boot_disk " || true)
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[ ''${#disks[@]} -gt 0 ] || { echo "router-setup: no disk to install to" >&2; exit 1; }
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echo "Disk to install to (it will be ERASED):"
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choose disk "Disk" "''${disks[@]}"
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nics=()
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for dev in /sys/class/net/*; do
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n=$(basename "$dev")
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[ -e "$dev/device" ] || continue
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state=$(cat "$dev/operstate" 2>/dev/null || echo "?")
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nics+=("$n $(cat "$dev/address") link $state")
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done
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[ ''${#nics[@]} -gt 0 ] || { echo "router-setup: no network interfaces found" >&2; exit 1; }
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echo
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echo "Interface towards the internet (WAN):"
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choose wan "WAN interface" "''${nics[@]}"
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echo
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echo "Interface for the local network (LAN):"
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choose lan "LAN interface" "''${nics[@]}"
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echo
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echo "Internet connection:"
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choose wan_type "Connection" \
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"dhcp (behind a cable modem, an ONT or another router)" \
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"pppoe (DSL or fibre with a username and password)"
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pppoe_user="" pppoe_password="" pppoe_vlan=""
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if [ "$wan_type" = pppoe ]; then
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while [ -z "$pppoe_user" ]; do ask pppoe_user "PPPoE username"; done
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while [ -z "$pppoe_password" ]; do ask_secret pppoe_password "PPPoE password"; done
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while :; do
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ask pppoe_vlan "VLAN ID the provider requires (empty for none)" ""
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[ -z "$pppoe_vlan" ] && break
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[[ $pppoe_vlan =~ ^[0-9]+$ ]] && [ "$pppoe_vlan" -ge 1 ] && [ "$pppoe_vlan" -le 4094 ] && break
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echo " a number from 1 to 4094" >&2
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done
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fi
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if [ "$wan" = "$lan" ] && [ -z "$pppoe_vlan" ]; then
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echo "router-setup: WAN and LAN can only share an interface when PPPoE runs on a VLAN" >&2
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exit 1
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fi
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echo
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ask host "Host name" "router"
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while :; do
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ask lan_address "Router address on the LAN (a /24 network)" "192.168.1.1"
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ipv4_ok "$lan_address" && break
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echo " an IPv4 address like 192.168.1.1" >&2
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done
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net=''${lan_address%.*}
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echo
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echo "Password for the web UI and for root on the console (at least 8 characters):"
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while :; do
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ask_secret webui_password "Password"
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ask_secret webui_password2 "Again"
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[ "$webui_password" = "$webui_password2" ] && [ ''${#webui_password} -ge 8 ] && break
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echo " the passwords differ or are too short" >&2
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done
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ask ssh_key "SSH public key for root (optional, one line)" ""
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echo
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echo "Summary"
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echo " disk: $disk (will be erased)"
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echo " WAN: $wan, $wan_type''${pppoe_user:+ as $pppoe_user}''${pppoe_vlan:+ on VLAN $pppoe_vlan}"
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echo " LAN: $lan, $lan_address/24, DHCP $net.100 - $net.200"
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echo " host name: $host"
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echo " web UI: https://$lan_address"
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ask answer "Type the disk name ($disk) to install"
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[ "$answer" = "$disk" ] || { echo "aborted" >&2; exit 1; }
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work=$(mktemp -d /run/router-setup.XXXXXX)
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chmod 0700 "$work"
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trap 'rm -rf "$work"' EXIT
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mkdir -p "$work/secrets/config"
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config=$work/secrets/config
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cp ${cfg.flake} "$config/flake.nix"
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chmod 0644 "$config/flake.nix"
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if [ -n "$local_nix" ]; then cp "$local_nix" "$config/local.nix"; fi
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keys=$( [ -n "$ssh_key" ] && jq -n --arg k "$ssh_key" '[$k]' || echo '[]')
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jq -n \
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--arg host "$host" --arg state "${cfg.stateVersion}" --argjson keys "$keys" \
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--arg wan "$wan" --arg type "$wan_type" --arg user "$pppoe_user" --arg vlan "$pppoe_vlan" \
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--arg lan "$lan" --arg addr "$lan_address" --arg net "$net" '
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{
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system: { hostName: $host, stateVersion: $state, sshKeys: $keys },
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router: {
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wan: ({ interface: $wan, ipv4: { type: $type } }
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| if $type == "pppoe" then .ipv4.pppoe = ({ username: $user, passwordFile: "/var/lib/router/pppoe-password" }
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+ (if $vlan == "" then {} else { vlan: ($vlan | tonumber) } end)) else . end),
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lans: {
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lan: {
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interface: $lan, internet: true,
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ipv4: { address: $addr },
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dhcp: { pool: { start: ($net + ".100"), end: ($net + ".200") } }
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}
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}
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}
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}' > "$config/settings.json"
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if [ "$wan_type" = pppoe ]; then
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printf '%s' "$pppoe_password" > "$work/secrets/pppoe-password"
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fi
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printf '%s\n' "$webui_password" | router-webui passwd "$work/secrets/webui-password"
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(umask 077; printf '%s\n' "$webui_password" | mkpasswd -s > "$work/secrets/root-password")
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echo
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echo ">> building the router system (no internet needed; takes a few minutes)"
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system=$(nix build --no-link --print-out-paths --out-link "$work/system" \
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"path:$config#nixosConfigurations.router.config.system.build.toplevel")
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router-install --yes --secrets "$work/secrets" --system "$system" "$disk"
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echo
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echo "After rebooting, open https://$lan_address from the LAN."
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'';
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};
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in
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{
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imports = [ ./install-script.nix ];
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options.router.setup = {
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flake = lib.mkOption {
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type = lib.types.path;
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description = "The configuration flake (flake.nix) installed systems are built from.";
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};
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reference = lib.mkOption {
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type = lib.types.package;
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description = ''
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A router system built the same way (`lib.mkRouterSystem`). Its closure
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is what lets the installer build the chosen configuration offline.
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'';
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};
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stateVersion = lib.mkOption {
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type = lib.types.str;
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default = config.system.nixos.release;
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description = "system.stateVersion of installed routers.";
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};
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};
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config = {
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environment.systemPackages = [ setup ];
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system.extraDependencies = [ cfg.reference ];
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nix.settings.experimental-features = [
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"nix-command"
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"flakes"
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];
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};
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}
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