init

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1635844945,
+        "narHash": "sha256-tZcL307dj28jgEU1Wdn+zwG9neyW0H2+ZjdVhvJxh9g=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b67e752c29f18a0ca5534a07661366d6a2c2e649",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,49 @@
+{
+  description = "IPMI HDD temp fan control";
+
+  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    python_pkgs = nixpkgs.legacyPackages.${system}.python3.pkgs;
+    packageName = "ipmihddtemp";
+    app = python_pkgs.buildPythonApplication rec {
+      pname = packageName;
+
+      version = builtins.substring 0 8 self.lastModifiedDate;
+
+      src = ./.;
+
+      postPatch = ''
+        substituteInPlace ipmihddtemp.py \
+          --replace "ipmitool" "${pkgs.ipmitool}/bin/ipmitool"
+      '';
+
+      doCheck = false;
+
+      propagatedBuildInputs = with python_pkgs; [
+        pysmart
+      ];
+    };
+    module = ({ config, lib, pkgs, ... }: let
+      cfg = config.${packageName};
+    in {
+      options.${packageName} = with lib.options; {
+        enable = mkEnableOption packageName;
+      };
+
+      config = lib.mkIf cfg.enable {
+        systemd.services.ipmihddtemp = {
+          wantedBy = [ "multi-user.target" ];
+          script = "${app}/bin/ipmihddtemp";
+          enable = true;
+        };
+      };
+    });
+  in {
+    defaultPackage.${system} = app;
+    nixosModules.${packageName} = module;
+    nixosModule = self.nixosModules.${packageName};
+  };
+}

ipmihddtemp.py

@@ -0,0 +1,42 @@
+import math
+import subprocess
+import time
+from pySMART import DeviceList
+
+MIN_FAN_SPEED = 30
+MAX_FAN_SPEED = 100
+
+MIN_HDD_TEMP = 30
+MAX_HDD_TEMP = 50
+
+devlist = DeviceList()
+
+# Put fans in full speed mode
+subprocess.run(["ipmitool", "raw", "0x30", "0x45", "0x01", "0x01"])
+
+def main():
+    while True:
+        for device in devlist:
+            device.update()
+
+        # Linear fan speed between MIN_FAN_SPEED and MAX_FAN_SPEED
+        fan_speed = max(
+            min(
+                math.ceil(
+                    MIN_FAN_SPEED
+                    + (
+                        (MAX_FAN_SPEED - MIN_FAN_SPEED)
+                        * (
+                            (max([x.temperature for x in devlist]) - MIN_HDD_TEMP)
+                            / (MAX_HDD_TEMP - MIN_HDD_TEMP)
+                        )
+                    )
+                ),
+                MAX_FAN_SPEED,
+            ),
+            MIN_FAN_SPEED,
+        )
+
+        subprocess.run(["ipmitool", "raw", "0x30", "0x70", "0x66", "0x01", "0x00", hex(fan_speed)])
+
+        time.sleep(10)

setup.py

@@ -0,0 +1,20 @@
+from setuptools import setup
+
+setup(
+    name='ipmihddtemp',
+    py_modules=['ipmihddtemp'],
+    version='1.0',
+    description='IPMI HDD temp fan control',
+    author='Paul TREHIOU',
+    author_email='paul@nyanlout.re',
+    url='https://gitea.nyanlout.re/nyanloutre/ipmihddtemp',
+    license='MIT',
+    entry_points={
+        'console_scripts': [
+            'ipmihddtemp=ipmihddtemp:main'
+        ]
+    },
+    install_requires=[
+          'pysmart'
+    ]
+)