From d76378c5d5951edbd04e99f834fbea20d88045c8 Mon Sep 17 00:00:00 2001
From: Finn Landweber <finn@landweber.xyz>
Date: Fri, 23 Feb 2024 15:48:13 +0100
Subject: added prometheus-borgmatic-exporter module

(cherry picked from commit 0d58b75cba5cb091ae35916192deb33b1c2ad49d)
---
 .../services/monitoring/prometheus/exporters.nix   |  1 +
 .../monitoring/prometheus/exporters/borgmatic.nix  | 34 ++++++++++++++++++++++
 nixos/tests/prometheus-exporters.nix               | 20 +++++++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 nixos/modules/services/monitoring/prometheus/exporters/borgmatic.nix

diff --git a/nixos/modules/services/monitoring/prometheus/exporters.nix b/nixos/modules/services/monitoring/prometheus/exporters.nix
index 2dc12a221bf0..b257690a6059 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters.nix
@@ -27,6 +27,7 @@ let
     "bird"
     "bitcoin"
     "blackbox"
+    "borgmatic"
     "buildkite-agent"
     "collectd"
     "dmarc"
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/borgmatic.nix b/nixos/modules/services/monitoring/prometheus/exporters/borgmatic.nix
new file mode 100644
index 000000000000..573230c3afca
--- /dev/null
+++ b/nixos/modules/services/monitoring/prometheus/exporters/borgmatic.nix
@@ -0,0 +1,34 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.services.prometheus.exporters.borgmatic;
+in
+{
+  port = 9996;
+  extraOpts.configFile = lib.mkOption {
+    type = lib.types.path;
+    default = "/etc/borgmatic/config.yaml";
+    description = ''
+      The path to the borgmatic config file
+    '';
+  };
+
+  serviceOpts = {
+    serviceConfig = {
+      DynamicUser = false;
+      ProtectSystem = false;
+      ProtectHome = lib.mkForce false;
+      ExecStart = ''
+        ${pkgs.prometheus-borgmatic-exporter}/bin/borgmatic-exporter run \
+          --port ${toString cfg.port} \
+          --config ${toString cfg.configFile} \
+          ${lib.concatMapStringsSep " " (f: lib.escapeShellArg f) cfg.extraFlags}
+      '';
+    };
+  };
+}
diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index 56569c4de2c8..637405834f55 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -177,6 +177,26 @@ let
       '';
     };
 
+    borgmatic = {
+      exporterConfig = {
+        enable = true;
+        user = "root";
+      };
+      metricProvider = {
+        services.borgmatic.enable = true;
+        services.borgmatic.settings.source_directories = [ "/home" ];
+        services.borgmatic.settings.repositories = [ { label = "local"; path = "/var/backup"; } ];
+        services.borgmatic.settings.keep_daily = 10;
+      };
+      exporterTest = ''
+        succeed("borgmatic rcreate -e none")
+        succeed("borgmatic")
+        wait_for_unit("prometheus-borgmatic-exporter.service")
+        wait_for_open_port(9996)
+        succeed("curl -sSf localhost:9996/metrics | grep 'borg_total_backups{repository=\"/var/backup\"} 1'")
+      '';
+    };
+
     collectd = {
       exporterConfig = {
         enable = true;
-- 
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