Add Nix packages for Grafana plugins and allow declarative installation

nixos/modules/services/monitoring/grafana.nix

@@ -5,10 +5,11 @@ with lib;
 let
   cfg = config.services.grafana;
   opt = options.services.grafana;
+  declarativePlugins = pkgs.linkFarm "grafana-plugins" (builtins.map (pkg: { name = pkg.pname; path = pkg; }) cfg.declarativePlugins);
 
   envOptions = {
     PATHS_DATA = cfg.dataDir;
-    PATHS_PLUGINS = "${cfg.dataDir}/plugins";
+    PATHS_PLUGINS = if builtins.isNull cfg.declarativePlugins then "${cfg.dataDir}/plugins" else declarativePlugins;
     PATHS_LOGS = "${cfg.dataDir}/log";
 
     SERVER_PROTOCOL = cfg.protocol;
@@ -260,6 +261,12 @@ in {
       defaultText = "pkgs.grafana";
       type = types.package;
     };
+    declarativePlugins = mkOption {
+      type = with types; nullOr (listOf path);
+      default = null;
+      description = "If non-null, then a list of packages containing Grafana plugins to install. If set, plugins cannot be manually installed.";
+      example = literalExample "with pkgs.grafanaPlugins; [ grafana-piechart-panel ]";
+    };
 
     dataDir = mkOption {
       description = "Data directory.";

nixos/tests/grafana.nix

@@ -17,6 +17,10 @@ let
   };
 
   extraNodeConfs = {
+    declarativePlugins = {
+      services.grafana.declarativePlugins = [ pkgs.grafanaPlugins.grafana-clock-panel ];
+    };
+
     postgresql = {
       services.grafana.database = {
         host = "127.0.0.1:5432";
@@ -52,7 +56,7 @@ let
     nameValuePair dbName (mkMerge [
     baseGrafanaConf
     (extraNodeConfs.${dbName} or {})
-  ])) [ "sqlite" "postgresql" "mysql" ]);
+  ])) [ "sqlite" "declarativePlugins" "postgresql" "mysql" ]);
 
 in {
   name = "grafana";
@@ -66,6 +70,14 @@ in {
   testScript = ''
     start_all()
 
+    with subtest("Declarative plugins installed"):
+        declarativePlugins.wait_for_unit("grafana.service")
+        declarativePlugins.wait_for_open_port(3000)
+        declarativePlugins.succeed(
+            "curl -sSfN -u testadmin:snakeoilpwd http://127.0.0.1:3000/api/plugins | grep -q grafana-clock-panel"
+        )
+        declarativePlugins.shutdown()
+
     with subtest("Successful API query as admin user with sqlite db"):
         sqlite.wait_for_unit("grafana.service")
         sqlite.wait_for_open_port(3000)

pkgs/servers/monitoring/grafana/plugins/default.nix

@@ -0,0 +1,7 @@
+{ newScope, pkgs }:
+
+let
+  callPackage = newScope (pkgs // plugins);
+  plugins = import ./plugins.nix { inherit callPackage; };
+in
+  plugins

pkgs/servers/monitoring/grafana/plugins/grafana-clock-panel/default.nix

@@ -0,0 +1,13 @@
+{ grafanaPlugin, lib }:
+
+grafanaPlugin rec {
+  pname = "grafana-clock-panel";
+  version = "1.1.1";
+  zipHash = "sha256-SvZyg7r+XG6i7jqYwxpPn6ZzJc7qmtfPtyphYppURDk=";
+  meta = with lib; {
+    description = "Clock panel for Grafana";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lukegb ];
+    platforms = platforms.unix;
+  };
+}

pkgs/servers/monitoring/grafana/plugins/grafana-piechart-panel/default.nix

@@ -0,0 +1,13 @@
+{ grafanaPlugin, lib }:
+
+grafanaPlugin rec {
+  pname = "grafana-piechart-panel";
+  version = "1.6.1";
+  zipHash = "sha256-64K/efoBKuBFp8Jw79hTdMyTurTZsL0qfgPDcUWz2jg=";
+  meta = with lib; {
+    description = "Pie chart panel for Grafana";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lukegb ];
+    platforms = platforms.unix;
+  };
+}

pkgs/servers/monitoring/grafana/plugins/grafana-plugin.nix

@@ -0,0 +1,28 @@
+{ stdenvNoCC, fetchurl, unzip }:
+
+{ pname, version, zipHash, meta ? {}, passthru ? {}, ... }@args:
+stdenvNoCC.mkDerivation ({
+  inherit pname version;
+
+  src = fetchurl {
+    name = "${pname}-${version}.zip";
+    url = "https://grafana.com/api/plugins/${pname}/versions/${version}/download";
+    hash = zipHash;
+  };
+
+  nativeBuildInputs = [ unzip ];
+
+  installPhase = ''
+    cp -R "." "$out"
+    chmod -R a-w "$out"
+    chmod u+w "$out"
+  '';
+
+  passthru = {
+    updateScript = [ ./update-grafana-plugin.sh pname ];
+  } // passthru;
+
+  meta = {
+    homepage = "https://grafana.com/grafana/plugins/${pname}";
+  } // meta;
+} // (builtins.removeAttrs args [ "pname" "version" "sha256" "meta" ]))

pkgs/servers/monitoring/grafana/plugins/grafana-polystat-panel/default.nix

@@ -0,0 +1,13 @@
+{ grafanaPlugin, lib }:
+
+grafanaPlugin rec {
+  pname = "grafana-polystat-panel";
+  version = "1.2.2";
+  zipHash = "sha256-HWQdhstnrDuXPithZ8kOG2ZtSeAT215MJ1ftMCt6/tc=";
+  meta = with lib; {
+    description = "Hexagonal multi-stat panel for Grafana";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lukegb ];
+    platforms = platforms.unix;
+  };
+}

pkgs/servers/monitoring/grafana/plugins/grafana-worldmap-panel/default.nix

@@ -0,0 +1,13 @@
+{ grafanaPlugin, lib }:
+
+grafanaPlugin rec {
+  pname = "grafana-worldmap-panel";
+  version = "0.3.2";
+  zipHash = "sha256-MGAJzS9X91x6wt305jH1chLoW3zd7pIYDwRnPg9qrgE=";
+  meta = with lib; {
+    description = "World Map panel for Grafana";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lukegb ];
+    platforms = platforms.unix;
+  };
+}

pkgs/servers/monitoring/grafana/plugins/plugins.nix

@@ -0,0 +1,11 @@
+{ callPackage }:
+{
+  inherit callPackage;
+
+  grafanaPlugin = callPackage ./grafana-plugin.nix { };
+
+  grafana-clock-panel = callPackage ./grafana-clock-panel { };
+  grafana-piechart-panel = callPackage ./grafana-piechart-panel { };
+  grafana-polystat-panel = callPackage ./grafana-polystat-panel { };
+  grafana-worldmap-panel = callPackage ./grafana-worldmap-panel { };
+}

pkgs/servers/monitoring/grafana/plugins/update-grafana-plugin.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq common-updater-scripts
+
+set -eu -o pipefail
+
+readonly plugin_name="$1"
+readonly latest_version="$(curl "https://grafana.com/api/plugins/${plugin_name}" | jq -r .version)"
+update-source-version "grafanaPlugins.${plugin_name}" "$latest_version"

pkgs/top-level/all-packages.nix

@@ -17164,6 +17164,7 @@ in
   gofish = callPackage ../servers/gopher/gofish { };
 
   grafana = callPackage ../servers/monitoring/grafana { };
+  grafanaPlugins = dontRecurseIntoAttrs (callPackage ../servers/monitoring/grafana/plugins { });
 
   grafana-loki = callPackage ../servers/monitoring/loki { };