cbfcf14301
This module configures irccat by creating a JSON configuration file from a user-supplied Nix struct (this is not checked for correctness), and merging it recursively with secrets from `/etc/secrets/irccat.json` at service launch time. This way we get the ability to configure (most) options declaratively via Nix, while providing the secrets outside of Nix. Side note: We need to figure out a secrets distribution mechanism. Tested: Wrote a dummy config in whitby/default.nix locally and checked that this builds, but I have not actually run the service yet. I expect that some minor tweaks will end up being necessary. Change-Id: I02a2e8dc40a7f8417fd77afcf8a12ac3df117988 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2074 Tested-by: BuildkiteCI Reviewed-by: lukegb <lukegb@tvl.fyi> Reviewed-by: glittershark <grfn@gws.fyi>
49 lines
1.4 KiB
Nix
49 lines
1.4 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.services.depot.irccat;
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description = "irccat - forward messages to IRC";
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# irccat expects to read its configuration from the *current
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# directory*, and its configuration contains secrets.
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#
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# To make this work we construct the JSON configuration file and
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# then recursively merge it with an on-disk secret using jq on
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# service launch.
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configJson = pkgs.writeText "irccat.json" (builtins.toJSON cfg.config);
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configMerge = pkgs.writeShellScript "merge-irccat-config" ''
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if [ ! -f "/etc/secrets/irccat.json" ]; then
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echo "irccat secrets file is missing"
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exit 1
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fi
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# jq's * is the recursive merge operator
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${pkgs.jq}/bin/jq -s '.[0] * .[1]' ${configJson} /etc/secrets/irccat.json \
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> /var/lib/irccat/irccat.json
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'';
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in {
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options.services.depot.irccat = {
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enable = lib.mkEnableOption description;
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config = lib.mkOption {
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type = lib.types.attrs; # varying value types
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description = "Configuration structure (unchecked!)";
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};
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};
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config = lib.mkIf cfg.enable {
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systemd.services.irccat = {
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inherit description;
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preStart = "${configMerge}";
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script = "${config.depot.third_party.irccat}/bin/irccat";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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DynamicUser = true;
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StateDirectory = "irccat";
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WorkingDirectory = "/var/lib/irccat";
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Restart = "always";
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};
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};
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};
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}
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