From d83bd16a2eab64e3e1b67cd5689807ec844450ba Mon Sep 17 00:00:00 2001
From: Flakebi <flakebi@t-online.de>
Date: Tue, 18 May 2021 22:49:32 +0200
Subject: [PATCH 1/2] prometheus-script-exporter: init at 1.2.0

---
 .../monitoring/prometheus/script-exporter.nix | 25 +++++++++++++++++++
 pkgs/top-level/all-packages.nix               |  1 +
 2 files changed, 26 insertions(+)
 create mode 100644 pkgs/servers/monitoring/prometheus/script-exporter.nix

diff --git a/pkgs/servers/monitoring/prometheus/script-exporter.nix b/pkgs/servers/monitoring/prometheus/script-exporter.nix
new file mode 100644
index 00000000000..d0806b6c5fa
--- /dev/null
+++ b/pkgs/servers/monitoring/prometheus/script-exporter.nix
@@ -0,0 +1,25 @@
+{ lib, buildGoModule, fetchFromGitHub, nixosTests }:
+
+buildGoModule rec {
+  pname = "script_exporter";
+  version = "1.2.0";
+
+  src = fetchFromGitHub {
+    owner = "adhocteam";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "t/xgRalcHxEcT1peU1ePJUItD02rQdfz1uWpXDBo6C0=";
+  };
+
+  vendorSha256 = "Hs1SNpC+t1OCcoF3FBgpVGkhR97ulq6zYhi8BQlgfVc=";
+
+  passthru.tests = { inherit (nixosTests.prometheus-exporters) script; };
+
+  meta = with lib; {
+    description = "Shell script prometheus exporter";
+    homepage = "https://github.com/adhocteam/script_exporter";
+    license = licenses.mit;
+    maintainers = with maintainers; [ Flakebi ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 88e6731df85..5cdce350904 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -19701,6 +19701,7 @@ in
   prometheus-redis-exporter = callPackage ../servers/monitoring/prometheus/redis-exporter.nix { };
   prometheus-rabbitmq-exporter = callPackage ../servers/monitoring/prometheus/rabbitmq-exporter.nix { };
   prometheus-rtl_433-exporter = callPackage ../servers/monitoring/prometheus/rtl_433-exporter.nix { };
+  prometheus-script-exporter = callPackage ../servers/monitoring/prometheus/script-exporter.nix { };
   prometheus-smokeping-prober = callPackage ../servers/monitoring/prometheus/smokeping-prober.nix { };
   prometheus-snmp-exporter = callPackage ../servers/monitoring/prometheus/snmp-exporter.nix { };
   prometheus-statsd-exporter = callPackage ../servers/monitoring/prometheus/statsd-exporter.nix { };

From 3bcf4e31ef70e2d6ec3fd387c174673aa01ef736 Mon Sep 17 00:00:00 2001
From: Flakebi <flakebi@t-online.de>
Date: Tue, 18 May 2021 22:53:10 +0200
Subject: [PATCH 2/2] nixos/prometheus: add script exporter

---
 .../monitoring/prometheus/exporters.nix       |  1 +
 .../prometheus/exporters/script.nix           | 64 +++++++++++++++++++
 nixos/tests/prometheus-exporters.nix          | 18 ++++++
 3 files changed, 83 insertions(+)
 create mode 100644 nixos/modules/services/monitoring/prometheus/exporters/script.nix

diff --git a/nixos/modules/services/monitoring/prometheus/exporters.nix b/nixos/modules/services/monitoring/prometheus/exporters.nix
index 9fcfe7b52e0..b57b73522f8 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters.nix
@@ -55,6 +55,7 @@ let
     "redis"
     "rspamd"
     "rtl_433"
+    "script"
     "snmp"
     "smokeping"
     "sql"
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/script.nix b/nixos/modules/services/monitoring/prometheus/exporters/script.nix
new file mode 100644
index 00000000000..104ab859f2e
--- /dev/null
+++ b/nixos/modules/services/monitoring/prometheus/exporters/script.nix
@@ -0,0 +1,64 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.script;
+  configFile = pkgs.writeText "script-exporter.yaml" (builtins.toJSON cfg.settings);
+in
+{
+  port = 9172;
+  extraOpts = {
+    settings.scripts = mkOption {
+      type = with types; listOf (submodule {
+        options = {
+          name = mkOption {
+            type = str;
+            example = "sleep";
+            description = "Name of the script.";
+          };
+          script = mkOption {
+            type = str;
+            example = "sleep 5";
+            description = "Shell script to execute when metrics are requested.";
+          };
+          timeout = mkOption {
+            type = nullOr int;
+            default = null;
+            example = 60;
+            description = "Optional timeout for the script in seconds.";
+          };
+        };
+      });
+      example = literalExample ''
+        {
+          scripts = [
+            { name = "sleep"; script = "sleep 5"; }
+          ];
+        }
+      '';
+      description = ''
+        All settings expressed as an Nix attrset.
+
+        Check the official documentation for the corresponding YAML
+        settings that can all be used here: <link xlink:href="https://github.com/adhocteam/script_exporter#sample-configuration" />
+      '';
+    };
+  };
+  serviceOpts = {
+    serviceConfig = {
+      ExecStart = ''
+        ${pkgs.prometheus-script-exporter}/bin/script_exporter \
+          --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
+          --config.file ${configFile} \
+          ${concatStringsSep " \\\n  " cfg.extraFlags}
+      '';
+      NoNewPrivileges = true;
+      ProtectHome = true;
+      ProtectSystem = "strict";
+      ProtectKernelTunables = true;
+      ProtectKernelModules = true;
+      ProtectControlGroups = true;
+    };
+  };
+}
diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index e3bfff218ad..defec2b8376 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -945,6 +945,24 @@ let
       '';
     };
 
+    script = {
+      exporterConfig = {
+        enable = true;
+        settings.scripts = [
+          { name = "success"; script = "sleep 1"; }
+        ];
+      };
+      exporterTest = ''
+        wait_for_unit("prometheus-script-exporter.service")
+        wait_for_open_port(9172)
+        wait_until_succeeds(
+            "curl -sSf 'localhost:9172/probe?name=success' | grep -q '{}'".format(
+                'script_success{script="success"} 1'
+            )
+        )
+      '';
+    };
+
     smokeping = {
       exporterConfig = {
         enable = true;