nixos/polaris: init

2 files changed, 152 insertions, 0 deletions

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index d04a4f93555fc..034d6ba1f5826 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -615,6 +615,7 @@
   ./services/misc/plex.nix
   ./services/misc/plikd.nix
   ./services/misc/podgrab.nix
+  ./services/misc/polaris.nix
   ./services/misc/prowlarr.nix
   ./services/misc/tautulli.nix
   ./services/misc/pinnwand.nix
diff --git a/nixos/modules/services/misc/polaris.nix b/nixos/modules/services/misc/polaris.nix
new file mode 100644
index 0000000000000..68045af1528b5
--- /dev/null
+++ b/nixos/modules/services/misc/polaris.nix
@@ -0,0 +1,151 @@
+{ config
+, pkgs
+, lib
+, ...}:
+
+with lib;
+let
+  cfg = config.services.polaris;
+  settingsFormat = pkgs.formats.toml {};
+in
+{
+  options = {
+    services.polaris = {
+      enable = mkEnableOption "Polaris Music Server";
+
+      package = mkPackageOption pkgs "polaris" { };
+
+      user = mkOption {
+        type = types.str;
+        default = "polaris";
+        description = "User account under which Polaris runs.";
+      };
+
+      group = mkOption {
+        type = types.str;
+        default = "polaris";
+        description = "Group under which Polaris is run.";
+      };
+
+      extraGroups = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        description = "Polaris' auxiliary groups.";
+        example = literalExpression ''["media" "music"]'';
+      };
+
+      port = mkOption {
+        type = types.port;
+        default = 5050;
+        description = ''
+          The port which the Polaris REST api and web UI should listen to.
+          Note: polaris is hardcoded to listen to the hostname "0.0.0.0".
+        '';
+      };
+
+      settings = mkOption {
+        type = settingsFormat.type;
+        default = {};
+        description = ''
+          Contents for the TOML Polaris config, applied each start.
+          Although poorly documented, an example may be found here:
+          <link xlink:href="https://github.com/agersant/polaris/blob/374d0ca56fc0a466d797a4b252e2078607476797/test-data/config.toml">test-config.toml</link>
+        '';
+        example = literalExpression ''
+          {
+            settings.reindex_every_n_seconds = 7*24*60*60; # weekly, default is 1800
+            settings.album_art_pattern =
+              "(cover|front|folder)\.(jpeg|jpg|png|bmp|gif)";
+            mount_dirs = [
+              {
+                name = "NAS";
+                source = "/mnt/nas/music";
+              }
+              {
+                name = "Local";
+                source = "/home/my_user/Music";
+              }
+            ];
+          }
+        '';
+      };
+
+      openFirewall = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Open the configured port in the firewall.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.polaris = {
+      description = "Polaris Music Server";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = rec {
+        User = cfg.user;
+        Group = cfg.group;
+        DynamicUser = true;
+        SupplementaryGroups = cfg.extraGroups;
+        StateDirectory = "polaris";
+        CacheDirectory = "polaris";
+        ExecStart = escapeShellArgs ([
+          "${cfg.package}/bin/polaris"
+          "--foreground"
+          "--port" cfg.port
+          "--database" "/var/lib/${StateDirectory}/db.sqlite"
+          "--cache" "/var/cache/${CacheDirectory}"
+        ] ++ optionals (cfg.settings != {}) [
+          "--config" (settingsFormat.generate "polaris-config.toml" cfg.settings)
+        ]);
+        Restart = "on-failure";
+
+        # Security options:
+
+        #NoNewPrivileges = true; # implied by DynamicUser
+        #RemoveIPC = true; # implied by DynamicUser
+
+        AmbientCapabilities = "";
+        CapabilityBoundingSet = "";
+
+        DeviceAllow = "";
+
+        LockPersonality = true;
+
+        #PrivateTmp = true; # implied by DynamicUser
+        PrivateDevices = true;
+        PrivateUsers = true;
+
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+
+        RestrictNamespaces = true;
+        RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
+        RestrictRealtime = true;
+        #RestrictSUIDSGID = true; # implied by DynamicUser
+
+        SystemCallArchitectures = "native";
+        SystemCallErrorNumber = "EPERM";
+        SystemCallFilter = [
+          "@system-service"
+          "~@cpu-emulation" "~@debug" "~@keyring" "~@memlock" "~@obsolete" "~@privileged" "~@setuid"
+        ];
+      };
+    };
+
+    networking.firewall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ cfg.port ];
+    };
+
+  };
+
+  meta.maintainers = with maintainers; [ pbsds ];
+}