Use a slightly modified version of the influxdb module to avoid pulling in collectd and indirectly xen

influxdb-module.nix

@@ -0,0 +1,196 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.influxdb;
+
+  configOptions = recursiveUpdate {
+    meta = {
+      bind-address = ":8088";
+      commit-timeout = "50ms";
+      dir = "${cfg.dataDir}/meta";
+      election-timeout = "1s";
+      heartbeat-timeout = "1s";
+      hostname = "localhost";
+      leader-lease-timeout = "500ms";
+      retention-autocreate = true;
+    };
+
+    data = {
+      dir = "${cfg.dataDir}/data";
+      wal-dir = "${cfg.dataDir}/wal";
+      max-wal-size = 104857600;
+      wal-enable-logging = true;
+      wal-flush-interval = "10m";
+      wal-partition-flush-delay = "2s";
+    };
+
+    cluster = {
+      shard-writer-timeout = "5s";
+      write-timeout = "5s";
+    };
+
+    retention = {
+      enabled = true;
+      check-interval = "30m";
+    };
+
+    http = {
+      enabled = true;
+      auth-enabled = false;
+      bind-address = ":8086";
+      https-enabled = false;
+      log-enabled = true;
+      pprof-enabled = false;
+      write-tracing = false;
+    };
+
+    monitor = {
+      store-enabled = false;
+      store-database = "_internal";
+      store-interval = "10s";
+    };
+
+    admin = {
+      enabled = true;
+      bind-address = ":8083";
+      https-enabled = false;
+    };
+
+    graphite = [{
+      enabled = false;
+    }];
+
+    udp = [{
+      enabled = false;
+    }];
+
+    collectd = [{
+      enabled = false;
+      database = "collectd_db";
+      bind-address = ":25826";
+    }];
+
+    opentsdb = [{
+      enabled = false;
+    }];
+
+    continuous_queries = {
+      enabled = true;
+      log-enabled = true;
+      recompute-previous-n = 2;
+      recompute-no-older-than = "10m";
+      compute-runs-per-interval = 10;
+      compute-no-more-than = "2m";
+    };
+
+    hinted-handoff = {
+      enabled = true;
+      dir = "${cfg.dataDir}/hh";
+      max-size = 1073741824;
+      max-age = "168h";
+      retry-rate-limit = 0;
+      retry-interval = "1s";
+    };
+  } cfg.extraConfig;
+
+  configFile = pkgs.runCommandLocal "config.toml" {
+    nativeBuildInputs = [ pkgs.remarshal ];
+  } ''
+    remarshal -if json -of toml \
+      < ${pkgs.writeText "config.json" (builtins.toJSON configOptions)} \
+      > $out
+  '';
+in
+{
+
+  ###### interface
+
+  options = {
+
+    services.influxdb = {
+
+      enable = mkOption {
+        default = false;
+        description = "Whether to enable the influxdb server";
+        type = types.bool;
+      };
+
+      package = mkOption {
+        default = pkgs.influxdb;
+        defaultText = literalExpression "pkgs.influxdb";
+        description = "Which influxdb derivation to use";
+        type = types.package;
+      };
+
+      user = mkOption {
+        default = "influxdb";
+        description = "User account under which influxdb runs";
+        type = types.str;
+      };
+
+      group = mkOption {
+        default = "influxdb";
+        description = "Group under which influxdb runs";
+        type = types.str;
+      };
+
+      dataDir = mkOption {
+        default = "/var/db/influxdb";
+        description = "Data directory for influxd data files.";
+        type = types.path;
+      };
+
+      extraConfig = mkOption {
+        default = {};
+        description = "Extra configuration options for influxdb";
+        type = types.attrs;
+      };
+    };
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.influxdb.enable {
+
+    systemd.tmpfiles.rules = [
+      "d '${cfg.dataDir}' 0770 ${cfg.user} ${cfg.group} - -"
+    ];
+
+    systemd.services.influxdb = {
+      description = "InfluxDB Server";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      serviceConfig = {
+        ExecStart = ''${cfg.package}/bin/influxd -config "${configFile}"'';
+        User = cfg.user;
+        Group = cfg.group;
+      };
+      postStart =
+        let
+          scheme = if configOptions.http.https-enabled then "-k https" else "http";
+          bindAddr = (ba: if hasPrefix ":" ba then "127.0.0.1${ba}" else "${ba}")(toString configOptions.http.bind-address);
+        in
+        mkBefore ''
+          until ${pkgs.curl.bin}/bin/curl -s -o /dev/null ${scheme}://${bindAddr}/ping; do
+            sleep 1;
+          done
+        '';
+    };
+
+    users.users = optionalAttrs (cfg.user == "influxdb") {
+      influxdb = {
+        uid = config.ids.uids.influxdb;
+        group = "influxdb";
+        description = "Influxdb daemon user";
+      };
+    };
+
+    users.groups = optionalAttrs (cfg.group == "influxdb") {
+      influxdb.gid = config.ids.gids.influxdb;
+    };
+  };
+
+}

influxdb.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
 {
+  disabledModules = [ "services/databases/influxdb.nix" ];
+  imports = [ ./influxdb-module.nix ];
   environment.systemPackages = [ pkgs.influxdb ];
   services.influxdb = {
     enable = true;