From e7fe37458bd247c6b504911144f445f8bc717730 Mon Sep 17 00:00:00 2001
From: Jeremy Baxter <jeremy@baxters.nz>
Date: Sat, 26 Oct 2024 20:11:08 +1300
Subject: [PATCH] flake.nix: init

---
 flake.lock | 27 +++++++++++++++
 flake.nix  | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 124 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..4249bfa
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1729665710,
+        "narHash": "sha256-AlcmCXJZPIlO5dmFzV3V2XF6x/OpNWUV8Y/FMPGd8Z4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2768c7d042a37de65bb1b5b3268fc987e534c49d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..0e9bcbc
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,97 @@
+{
+  description = "filesystem monitor";
+
+  inputs = {
+    nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      plats = nixpkgs.lib.platforms.unix;
+      forAllSystems = fn:
+        nixpkgs.lib.genAttrs plats (system:
+          fn (import nixpkgs {
+            inherit system;
+          })
+        );
+    in
+      {
+        packages = forAllSystems (pkgs: {
+          default = pkgs.stdenv.mkDerivation (finalAttrs: {
+            name = "bluetop";
+            src = ./.;
+
+            # overridable attributes
+            fileSystems = ["/"];
+            indexPage = null;
+
+            nativeBuildInputs = with pkgs; [ ldc ];
+
+            postPatch =
+              let
+                mounts = toString (pkgs.lib.forEach finalAttrs.fileSystems (f: ''"${f}",''));
+              in
+                ''
+                  ${if finalAttrs.indexPage != null
+                    then "install -Dm644 ${finalAttrs.indexPage} static/index.html"
+                    else ""}
+                  sed -E 's:mountpoints = \[.+\];$:mountpoints = \[${mounts}\];:' buildconf.d | tee buildconf.d
+                '';
+
+            dontAddPrefix = true;
+			enableParallelBuilding = true;
+            installFlags = [
+              "DESTDIR=$(out)"
+              "PREFIX=/"
+            ];
+
+            meta.mainProgram = "bluetopd";
+          });
+        });
+        nixosModule = { config, lib, pkgs, ... }:
+          with lib;
+          let
+            cfg = config.services.bluetop;
+          in
+            {
+              options = {
+                services.bluetop = {
+                  enable = mkEnableOption "bluetop, a status page displaying storage statistics";
+                  package = mkPackageOption pkgs "bluetop" { };
+                  openFirewall = mkOption {
+                    type = types.bool;
+                    default = false;
+                    description = "Whether to open the bluetop port to the firewall.";
+                  };
+                  port = mkOption {
+                    type = types.port;
+                    default = 8089;
+                    description = "Port for bluetop to bind to.";
+                  };
+                };
+              };
+
+              config = mkIf cfg.enable {
+                users.groups.bluetop = {};
+                users.users.bluetop = {
+                  description = "bluetop service user";
+                  group = "bluetop";
+                  isSystemUser = true;
+                };
+
+                systemd.services.bluetopd = {
+                  after = [ "network.target" ];
+                  wantedBy = [ "multi-user.target" ];
+                  script = ''
+                set -eu
+                ${getExe cfg.package} --port ${toString cfg.port}
+                  '';
+                };
+
+                networking.firewall = mkIf cfg.openFirewall {
+                  allowedTCPPorts = [ cfg.port ];
+                };
+              };
+            };
+      };
+}