95 lines
3.4 KiB
Nix
95 lines
3.4 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.virtualisation.digitalOcean;
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defaultConfigFile = pkgs.writeText "digitalocean-configuration.nix" ''
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{ modulesPath, lib, ... }:
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{
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imports = lib.optional (builtins.pathExists ./do-userdata.nix) ./do-userdata.nix ++ [
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(modulesPath + "/virtualisation/digital-ocean-config.nix")
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];
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}
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'';
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in {
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options.virtualisation.digitalOcean.rebuildFromUserData = mkOption {
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type = types.bool;
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default = true;
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example = true;
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description = lib.mdDoc "Whether to reconfigure the system from Digital Ocean user data";
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};
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options.virtualisation.digitalOcean.defaultConfigFile = mkOption {
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type = types.path;
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default = defaultConfigFile;
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defaultText = literalMD ''
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The default configuration imports user-data if applicable and
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`(modulesPath + "/virtualisation/digital-ocean-config.nix")`.
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'';
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description = lib.mdDoc ''
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A path to a configuration file which will be placed at
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`/etc/nixos/configuration.nix` and be used when switching to
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a new configuration.
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'';
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};
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config = {
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systemd.services.digitalocean-init = mkIf cfg.rebuildFromUserData {
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description = "Reconfigure the system from Digital Ocean userdata on startup";
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wantedBy = [ "network-online.target" ];
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unitConfig = {
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ConditionPathExists = "!/etc/nixos/do-userdata.nix";
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After = [ "digitalocean-metadata.service" "network-online.target" ];
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Requires = [ "digitalocean-metadata.service" ];
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X-StopOnRemoval = false;
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};
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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restartIfChanged = false;
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path = [ pkgs.jq pkgs.gnused pkgs.gnugrep config.systemd.package config.nix.package config.system.build.nixos-rebuild ];
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environment = {
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HOME = "/root";
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NIX_PATH = concatStringsSep ":" [
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"/nix/var/nix/profiles/per-user/root/channels/nixos"
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"nixos-config=/etc/nixos/configuration.nix"
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"/nix/var/nix/profiles/per-user/root/channels"
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];
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};
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script = ''
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set -e
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echo "attempting to fetch configuration from Digital Ocean user data..."
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userData=$(mktemp)
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if jq -er '.user_data' /run/do-metadata/v1.json > $userData; then
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# If the user-data looks like it could be a nix expression,
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# copy it over. Also, look for a magic three-hash comment and set
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# that as the channel.
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if nix-instantiate --parse $userData > /dev/null; then
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channels="$(grep '^###' "$userData" | sed 's|###\s*||')"
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printf "%s" "$channels" | while read channel; do
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echo "writing channel: $channel"
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done
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if [[ -n "$channels" ]]; then
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printf "%s" "$channels" > /root/.nix-channels
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nix-channel --update
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fi
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echo "setting configuration from Digital Ocean user data"
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cp "$userData" /etc/nixos/do-userdata.nix
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if [[ ! -e /etc/nixos/configuration.nix ]]; then
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install -m0644 ${cfg.defaultConfigFile} /etc/nixos/configuration.nix
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fi
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else
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echo "user data does not appear to be a Nix expression; ignoring"
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exit
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fi
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nixos-rebuild switch
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else
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echo "no user data is available"
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fi
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'';
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};
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};
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meta.maintainers = with maintainers; [ arianvp eamsden ];
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}
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