109 lines
3 KiB
Nix
109 lines
3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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# TODO replace with more secure service, e.g. matrix-sendmail (matrix-commander)
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# needs to support queueing
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# flake: https://github.com/emmanuelrosa/erosanix/blob/master/modules/matrix-sendmail.nix
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# call `matrix-commander --login` with credentials on service start
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let
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cfg = config.systemd.notify;
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sendmail = pkgs.writeScript "sendmail" ''
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#!${pkgs.runtimeShell}
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${pkgs.system-sendmail}/bin/sendmail -t <<ERRMAIL
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To: ${cfg.email.mailTo}
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From: ${cfg.email.mailFrom}
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Subject: Service $1 failed
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Content-Transfer-Encoding: 8bit
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Content-Type: text/plain; charset=UTF-8
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$(systemctl status --full "$1")
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ERRMAIL
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'';
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in {
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options = {
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systemd.notify = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable notifications for failed services.";
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};
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method = mkOption {
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type = types.enum [ "libnotify" "email" ];
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default = "libnotify";
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description = "The method for sending notifications.";
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};
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libnotify.user = mkOption {
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type = types.str;
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default = null;
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description = "User session to which the notification will be sent.";
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};
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email.mailTo = mkOption {
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type = types.str;
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default = null;
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description =
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"Email address to which the service status will be mailed.";
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};
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email.mailFrom = mkOption {
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type = types.str;
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default = null;
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description =
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"Email address from which the service status will be mailed.";
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};
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};
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systemd.services = mkOption {
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type = with types;
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attrsOf (submodule {
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config.onFailure = optional cfg.enable "notify@%n.service";
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});
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};
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};
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config = mkIf cfg.enable {
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assertions = [
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{
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assertion = cfg.method != "libnotify" || cfg.libnotify.user != null;
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message = "You need to specify a user";
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}
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{
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assertion = cfg.method != "email"
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|| (cfg.email.mailTo != null && cfg.email.mailFrom != null);
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message = "You need to specify a sender and a receiver";
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}
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];
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systemd.services."notify@" = {
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onFailure = lib.mkForce [ ];
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} // optionalAttrs (cfg.method == "libnotify") {
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description = "Desktop notifications for %i service failure";
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environment = {
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DBUS_SESSION_BUS_ADDRESS = "unix:path=/run/user/${
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toString config.users.users.${cfg.libnotify.user}.uid
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}/bus";
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INSTANCE = "%i";
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};
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script = ''
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${pkgs.libnotify}/bin/notify-send --urgency=critical \
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"Service '$INSTANCE' failed" \
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"$(journalctl -n 6 -o cat -u $INSTANCE)"
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'';
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serviceConfig = {
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Type = "oneshot";
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User = cfg.libnotify.user;
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};
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} // optionalAttrs (cfg.method == "email") {
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description = "E-Mail notifications for %i service failure";
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serviceConfig = {
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ExecStart = "${sendmail} %i";
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Type = "oneshot";
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};
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};
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};
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}
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