nixos/evcc: init

1 files changed, 92 insertions, 0 deletions

diff --git a/nixos/modules/services/home-automation/evcc.nix b/nixos/modules/services/home-automation/evcc.nix
new file mode 100644
index 000000000000..c12ba9d0c1e2
--- /dev/null
+++ b/nixos/modules/services/home-automation/evcc.nix
@@ -0,0 +1,92 @@
+{ lib
+, pkgs
+, config
+, ...
+}:
+
+with lib;
+
+let
+  cfg = config.services.evcc;
+
+  format = pkgs.formats.yaml {};
+  configFile = format.generate "evcc.yml" cfg.settings;
+
+  package = pkgs.evcc;
+in
+
+{
+  meta.maintainers = with lib.maintainers; [ hexa ];
+
+  options.services.evcc = with types; {
+    enable = mkEnableOption (lib.mdDoc "EVCC, the extensible EV Charge Controller with PV integration");
+
+    extraArgs = mkOption {
+      type = listOf str;
+      default = [];
+      description = lib.mdDoc ''
+        Extra arguments to pass to the evcc executable.
+      '';
+    };
+
+    settings = mkOption {
+      type = format.type;
+      description = lib.mdDoc ''
+        evcc configuration as a Nix attribute set.
+
+        Check for possible options in the sample [evcc.dist.yaml](https://github.com/andig/evcc/blob/${package.version}/evcc.dist.yaml].
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.evcc = {
+      after = [
+        "network-online.target"
+        "mosquitto.target"
+      ];
+      wantedBy = [
+        "multi-user.target"
+      ];
+
+      serviceConfig = {
+        ExecStart = "${package}/bin/evcc --config ${configFile} ${escapeShellArgs cfg.extraArgs}";
+        CapabilityBoundingSet = [ "" ];
+        DeviceAllow = [
+          "char-ttyUSB"
+        ];
+        DevicePolicy = "closed";
+        DynamicUser = true;
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        RestrictAddressFamilies = [
+          "AF_INET"
+          "AF_INET6"
+          "AF_UNIX"
+        ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProcSubset = "pid";
+        ProtectClock = true;
+        ProtectControlGroups= true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [
+          "@system-service"
+          "~@privileged"
+        ];
+        UMask = "0077";
+        User = "evcc";
+      };
+    };
+  };
+
+  meta.buildDocsInSandbox = false;
+}