moved nixos to a dir

nixos/common/services/vmagent.nix

@@ -0,0 +1,111 @@
+{ config, pkgs, lib, ... }:
+with lib;
+let cfg = config.services.vmagent;
+in {
+  options.services.vmagent = {
+    enable = mkEnableOption "vmagent";
+
+    user = mkOption {
+      default = "vmagent";
+      type = types.str;
+      description = ''
+        User account under which vmagent runs.
+      '';
+    };
+
+    group = mkOption {
+      type = types.str;
+      default = "vmagent";
+      description = ''
+        Group under which vmagent runs.
+      '';
+    };
+
+    package = mkOption {
+      default = pkgs.v.vmagent;
+      defaultText = "pkgs.v.vmagent";
+      type = types.package;
+      description = ''
+        vmagent package to use. 
+      '';
+    };
+
+    dataDir = mkOption {
+      type = types.str;
+      default = "/var/lib/vmagent";
+      description = ''
+        The directory where vmagent stores its data files.
+      '';
+    };
+
+    remoteWriteUrl = mkOption {
+      default = "http://localhost:8428/api/v1/write";
+      type = types.str;
+      description = ''
+        The remote storage endpoint such as VictoriaMetrics 
+      '';
+    };
+
+    prometheusConfig = mkOption {
+      default = "";
+      type = types.str;
+      example = ''
+        global:
+          scrape_interval: 5s
+        scrape_configs:
+          - job_name: 'apache'
+            static_configs:
+            - targets: ['apache-exporter:9117']
+      '';
+      description = ''
+        Config for prometheus style metrics
+      '';
+    };
+
+    openFirewall = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to open the firewall for the default ports.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # Create group if set to default
+    users.groups = mkIf (cfg.group == "vmagent") { vmagent = { }; };
+
+    # Create user if set to default
+    users.users = mkIf (cfg.user == "vmagent") {
+      vmagent = {
+        group = cfg.group;
+        shell = pkgs.bashInteractive;
+        description = "vmagent Daemon user";
+        home = cfg.dataDir;
+        isSystemUser = true;
+      };
+    };
+
+    # Open firewall if option is set to do so.
+    networking.firewall.allowedTCPPorts = mkIf (cfg.openFirewall) [ 8429 ];
+
+    # The actual service
+    systemd.services.vmagent = let prometheusConfig = pkgs.writeText "prometheus.yml" cfg.prometheusConfig;
+    in {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      description = "vmagent system service";
+      serviceConfig = {
+        User = cfg.user;
+        Group = cfg.group;
+        Type = "simple";
+        Restart = "on-failure";
+        WorkingDirectory = cfg.dataDir;
+        ExecStart =
+          "${cfg.package}/bin/vmagent -remoteWrite.url=${cfg.remoteWriteUrl} -promscrape.config=${prometheusConfig}";
+      };
+    };
+
+    systemd.tmpfiles.rules = [ "d '${cfg.dataDir}' 0755 ${cfg.user} ${cfg.group} -" ];
+  };
+}