From a4707b645feb946265b7a780f55e3e77bfbab14d Mon Sep 17 00:00:00 2001
From: happysalada <raphael@megzari.com>
Date: Thu, 28 Apr 2022 19:11:19 -0400
Subject: [PATCH] grafana-mimir: add initial module

---
 nixos/modules/module-list.nix               |  1 +
 nixos/modules/services/monitoring/mimir.nix | 63 +++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 nixos/modules/services/monitoring/mimir.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index dcd9bb8aff1..ed72e246453 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -662,6 +662,7 @@
   ./services/monitoring/longview.nix
   ./services/monitoring/mackerel-agent.nix
   ./services/monitoring/metricbeat.nix
+  ./services/monitoring/mimir.nix
   ./services/monitoring/monit.nix
   ./services/monitoring/munin.nix
   ./services/monitoring/nagios.nix
diff --git a/nixos/modules/services/monitoring/mimir.nix b/nixos/modules/services/monitoring/mimir.nix
new file mode 100644
index 00000000000..df853f037ee
--- /dev/null
+++ b/nixos/modules/services/monitoring/mimir.nix
@@ -0,0 +1,63 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) escapeShellArgs mkEnableOption mkIf mkOption types;
+
+  cfg = config.services.mimir;
+
+  settingsFormat = pkgs.formats.yaml {};
+in {
+  options.services.mimir = {
+    enable = mkEnableOption "mimir";
+
+    configuration = mkOption {
+      type = (pkgs.formats.json {}).type;
+      default = {};
+      description = ''
+        Specify the configuration for Mimir in Nix.
+      '';
+    };
+
+    configFile = mkOption {
+      type = types.nullOr types.path;
+      default = null;
+      description = ''
+        Specify a configuration file that Mimir should use.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = (
+        (cfg.configuration == {} -> cfg.configFile != null) &&
+        (cfg.configFile != null -> cfg.configuration == {})
+      );
+      message  = ''
+        Please specify either
+        'services.mimir.configuration' or
+        'services.mimir.configFile'.
+      '';
+    }];
+
+    systemd.services.mimir = {
+      description = "mimir Service Daemon";
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = let
+        conf = if cfg.configFile == null
+               then settingsFormat.generate "config.yaml" cfg.configuration
+               else cfg.configFile;
+      in
+      {
+        ExecStart = "${pkgs.grafana-mimir}/bin/mimir --config.file=${conf}";
+        DynamicUser = true;
+        Restart = "always";
+        ProtectSystem = "full";
+        DevicePolicy = "closed";
+        NoNewPrivileges = true;
+        StateDirectory = "mimir";
+      };
+    };
+  };
+}