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{ depot, config, lib, pkgs, ... }:
let
cfg = config.services.depot.irccat;
description = "irccat - forward messages to IRC";
# irccat expects to read its configuration from the *current
# directory*, and its configuration contains secrets.
#
# To make this work we construct the JSON configuration file and
# then recursively merge it with an on-disk secret using jq on
# service launch.
configJson = pkgs.writeText "irccat.json" (builtins.toJSON cfg.config);
mergeAndLaunch = pkgs.writeShellScript "merge-irccat-config" ''
if [ ! -f "$CREDENTIALS_DIRECTORY/secrets" ]; then
echo "irccat secrets file is missing"
exit 1
fi
# jq's * is the recursive merge operator
${pkgs.jq}/bin/jq -s '.[0] * .[1]' ${configJson} "$CREDENTIALS_DIRECTORY/secrets" \
> /var/lib/irccat/irccat.json
exec ${depot.third_party.irccat}/bin/irccat
'';
in {
options.services.depot.irccat = {
enable = lib.mkEnableOption description;
config = lib.mkOption {
type = lib.types.attrs; # varying value types
description = "Configuration structure (unchecked!)";
};
secretsFile = lib.mkOption {
type = lib.types.str;
description = "Path to the secrets file to be merged";
default = "/run/agenix/irccat";
};
};
config = lib.mkIf cfg.enable {
systemd.services.irccat = {
inherit description;
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${mergeAndLaunch}";
DynamicUser = true;
StateDirectory = "irccat";
WorkingDirectory = "/var/lib/irccat";
LoadCredential = "secrets:${cfg.secretsFile}";
Restart = "always";
};
};
};
}
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