From 36f58b687c48494e6f849f0bb816b5d4fcdc30f4 Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Tue, 27 Jul 2021 15:13:24 +0200
Subject: [PATCH] nixos/evcc: init

---
 .../from_md/release-notes/rl-2211.section.xml | 10 ++
 .../manual/release-notes/rl-2211.section.md   |  2 +
 nixos/modules/module-list.nix                 |  1 +
 .../modules/services/home-automation/evcc.nix | 92 +++++++++++++++++++
 4 files changed, 105 insertions(+)
 create mode 100644 nixos/modules/services/home-automation/evcc.nix

diff --git a/nixos/doc/manual/from_md/release-notes/rl-2211.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2211.section.xml
index 3ab35fe84bbf..763010ae82a3 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2211.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2211.section.xml
@@ -278,6 +278,16 @@
           <link linkend="opt-services.prometheus.sachet.enable">services.prometheus.sachet</link>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <link xlink:href="https://evcc.io">EVCC</link> is an EV charge
+          controller with PV integration. It supports a multitude of
+          chargers, meters, vehicle APIs and more and ties that together
+          with a well-tested backend and a lightweight web frontend.
+          Available as
+          <link linkend="opt-services.evcc.enable">services.evcc</link>.
+        </para>
+      </listitem>
       <listitem>
         <para>
           <link xlink:href="https://github.com/leetronics/infnoise">infnoise</link>,
diff --git a/nixos/doc/manual/release-notes/rl-2211.section.md b/nixos/doc/manual/release-notes/rl-2211.section.md
index 81aef68a716f..b8aa0cc09fa9 100644
--- a/nixos/doc/manual/release-notes/rl-2211.section.md
+++ b/nixos/doc/manual/release-notes/rl-2211.section.md
@@ -98,6 +98,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [Sachet](https://github.com/messagebird/sachet/), an SMS alerting tool for the Prometheus Alertmanager. Available as [services.prometheus.sachet](#opt-services.prometheus.sachet.enable).
 
+- [EVCC](https://evcc.io) is an EV charge controller with PV integration. It supports a multitude of chargers, meters, vehicle APIs and more and ties that together with a well-tested backend and a lightweight web frontend. Available as [services.evcc](#opt-services.evcc.enable).
+
 - [infnoise](https://github.com/leetronics/infnoise), a hardware True Random Number Generator dongle.
   Available as [services.infnoise](options.html#opt-services.infnoise.enable).
 
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 2a23a32eaba6..bc5f6f1d76cd 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -491,6 +491,7 @@
   ./services/hardware/vdr.nix
   ./services/home-automation/home-assistant.nix
   ./services/home-automation/zigbee2mqtt.nix
+  ./services/home-automation/evcc.nix
   ./services/logging/SystemdJournal2Gelf.nix
   ./services/logging/awstats.nix
   ./services/logging/filebeat.nix
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;
+}