From 6ae583f46f86fea04d85487e03bf6efc7a51e991 Mon Sep 17 00:00:00 2001
From: Malte Brandy <malte.brandy@maralorn.de>
Date: Sun, 22 May 2022 12:31:33 +0200
Subject: [PATCH] try folder size exporter

---
 common/default.nix                            |  4 ++++
 nixos/machines/hera/configuration.nix         |  1 +
 nixos/machines/zeus/configuration.nix         |  1 +
 .../roles/prometheus-folder-size-exporter.nix | 22 +++++++++++++++++++
 overlays/prometheus-folder-size-exporter.nix  | 13 +++++++++++
 5 files changed, 41 insertions(+)
 create mode 100644 nixos/roles/prometheus-folder-size-exporter.nix
 create mode 100644 overlays/prometheus-folder-size-exporter.nix

diff --git a/common/default.nix b/common/default.nix
index b0907610..6d011d8a 100644
--- a/common/default.nix
+++ b/common/default.nix
@@ -7,6 +7,10 @@
 with lib; {
   config = {
     m-0.monitoring = [
+      {
+        host = "hera:9974";
+        name = "hera-folder-sizes";
+      }
       {
         host = "apollo:9100";
         name = "apollo";
diff --git a/nixos/machines/hera/configuration.nix b/nixos/machines/hera/configuration.nix
index 0d6bd69b..591ee183 100644
--- a/nixos/machines/hera/configuration.nix
+++ b/nixos/machines/hera/configuration.nix
@@ -29,6 +29,7 @@ in {
     ../../roles/mailman.nix
     ../../roles/firefox-sync.nix
     ../../roles/goatcounter.nix
+    ../../roles/prometheus-folder-size-exporter.nix
     ./web.nix
     ./mail.nix
     ./boot.nix
diff --git a/nixos/machines/zeus/configuration.nix b/nixos/machines/zeus/configuration.nix
index 9758b5f9..9d5a683a 100644
--- a/nixos/machines/zeus/configuration.nix
+++ b/nixos/machines/zeus/configuration.nix
@@ -39,6 +39,7 @@ in {
     nixos.source = "/disk/persist/maralorn/git/config";
     machine-id.source = "/disk/persist/machine-id";
   };
+  environment.systemPackages = [pkgs.prometheus-folder-size-exporter];
 
   systemd.services."activate-home-manager" = {
     path = [pkgs.nix pkgs.dbus];
diff --git a/nixos/roles/prometheus-folder-size-exporter.nix b/nixos/roles/prometheus-folder-size-exporter.nix
new file mode 100644
index 00000000..b2c9158e
--- /dev/null
+++ b/nixos/roles/prometheus-folder-size-exporter.nix
@@ -0,0 +1,22 @@
+{pkgs, ...}: let
+  config = [
+    {
+      "path" = "/";
+      explode_depth = 1;
+      "sum_remaining_subfolders" = true;
+    }
+  ];
+in {
+  systemd.services.prometheus-folder-size-exporter = {
+    after = ["network-online.target"];
+    wants = ["network-online.target"];
+    description = "Prometheus folder size exporter";
+    wantedBy = ["multi-user.target"];
+
+    serviceConfig = {
+      DynamicUser = true;
+      Type = "simple";
+      ExecStart = "${pkgs.prometheus-folder-size-exporter}/bin/prometheus-folder-size-exporter -b 60 -i ${builtins.toJSON config} -p 9974";
+    };
+  };
+}
diff --git a/overlays/prometheus-folder-size-exporter.nix b/overlays/prometheus-folder-size-exporter.nix
new file mode 100644
index 00000000..99babcbc
--- /dev/null
+++ b/overlays/prometheus-folder-size-exporter.nix
@@ -0,0 +1,13 @@
+final: prev: {
+  prometheus-folder-size-exporter = final.rustPlatform.buildRustPackage rec {
+    pname = "prometheus_folder_size_exporter";
+    version = "0.5.0";
+    src = final.fetchFromGitHub {
+      owner = "MindFlavor";
+      repo = pname;
+      rev = version;
+      sha256 = "sha256-G1oWGiTyftloPxgOuiYFO7hofHdbwPCG4QDXK1t5qWk=";
+    };
+    cargoSha256 = "sha256:0baxb2fqdywfj9jxmhinm7fqyyn6sdfh6s5vnn7mgwawg00b7h7l";
+  };
+}