nixos/varnish: made compatible with varnish 5.2.1, add modules

* nixos/varnish: command line compatible with varnish 5.2.1, fixes
https://github.com/NixOS/nixpkgs/issues/27409
* nixos/varnish: add support for modules (services.varnish.extraModules)
* varnish-modules: init at 0.10.2
* varnish-geoip: init at 1.0.2
* varnish-rtstatus: init at 1.2.0
* varnish-digest: init at 1.0.1
* added services.varnish.extraCommandLine option

1 files changed, 36 insertions, 8 deletions

diff --git a/nixos/modules/services/web-servers/varnish/default.nix b/nixos/modules/services/web-servers/varnish/default.nix
index 5433db3b91c8..c3bc065d4651 100644
--- a/nixos/modules/services/web-servers/varnish/default.nix
+++ b/nixos/modules/services/web-servers/varnish/default.nix
@@ -7,14 +7,10 @@ with lib;
 {
   options = {
     services.varnish = {
-      enable = mkOption {
-        default = false;
-        description = "
-          Enable the Varnish Server.
-        ";
-      };
+      enable = mkEnableOption "Varnish Server";
 
       http_address = mkOption {
+        type = types.str;
         default = "*:6081";
         description = "
           HTTP listen address and port.
@@ -22,17 +18,37 @@ with lib;
       };
 
       config = mkOption {
+        type = types.lines;
         description = "
           Verbatim default.vcl configuration.
         ";
       };
 
       stateDir = mkOption {
+        type = types.path;
         default = "/var/spool/varnish/${config.networking.hostName}";
         description = "
           Directory holding all state for Varnish to run.
         ";
       };
+
+      extraModules = mkOption {
+        type = types.listOf types.package;
+        default = [];
+        example = literalExample "[ pkgs.varnish-geoip ]";
+        description = "
+          Varnish modules (except 'std').
+        ";
+      };
+
+      extraCommandLine = mkOption {
+        type = types.str;
+        default = "";
+        example = "-s malloc,256M";
+        description = "
+          Command line switches for varnishd (run 'varnishd -?' to get list of options)
+        ";
+      };
     };
 
   };
@@ -42,6 +58,7 @@ with lib;
     systemd.services.varnish = {
       description = "Varnish";
       wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
       preStart = ''
         mkdir -p ${cfg.stateDir}
         chown -R varnish:varnish ${cfg.stateDir}
@@ -49,8 +66,19 @@ with lib;
       postStop = ''
         rm -rf ${cfg.stateDir}
       '';
-      serviceConfig.ExecStart = "${pkgs.varnish}/sbin/varnishd -a ${cfg.http_address} -f ${pkgs.writeText "default.vcl" cfg.config} -n ${cfg.stateDir} -u varnish";
-      serviceConfig.Type = "forking";
+      serviceConfig = {
+        Type = "simple";
+        PermissionsStartOnly = true;
+        ExecStart = "${pkgs.varnish}/sbin/varnishd -a ${cfg.http_address} -f ${pkgs.writeText "default.vcl" cfg.config} -n ${cfg.stateDir} -F ${cfg.extraCommandLine}"
+          + optionalString (cfg.extraModules != []) " -p vmod_path='${makeSearchPathOutput "lib" "lib/varnish/vmods" ([pkgs.varnish] ++ cfg.extraModules)}' -r vmod_path";
+        Restart = "always";
+        RestartSec = "5s";
+        User = "varnish";
+        Group = "varnish";
+        AmbientCapabilities = "cap_net_bind_service";
+        NoNewPrivileges = true;
+        LimitNOFILE = 131072;
+      };
     };
 
     environment.systemPackages = [ pkgs.varnish ];