Add phpfpm NixOS service module

nixos/modules/module-list.nix

@@ -228,6 +228,7 @@
   ./services/web-servers/lighttpd/cgit.nix
   ./services/web-servers/lighttpd/gitweb.nix
   ./services/web-servers/nginx/default.nix
+  ./services/web-servers/phpfpm.nix
   ./services/web-servers/tomcat.nix
   ./services/web-servers/varnish/default.nix
   ./services/web-servers/zope2.nix

nixos/modules/services/web-servers/phpfpm.nix

@@ -0,0 +1,77 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+  cfg = config.services.phpfpm;
+
+  stateDir = "/run/phpfpm";
+
+  pidFile = "${stateDir}/phpfpm.pid";
+
+  cfgFile = pkgs.writeText "phpfpm.conf" ''
+    [global]
+    pid = ${pidFile}
+    error_log = syslog
+    daemonize = yes
+    ${cfg.extraConfig}
+
+    ${concatStringsSep "\n" (mapAttrsToList (n: v: "[${n}]\n${v}") cfg.poolConfigs)}
+  '';
+
+in {
+
+  options = {
+    services.phpfpm = {
+      extraConfig = mkOption {
+        type = types.str;
+        default = "";
+        description = ''
+          Extra configuration that should be put in the global section of
+          the PHP FPM configuration file. Do not specify the options
+          <literal>pid</literal>, <literal>error_log</literal> or
+          <literal>daemonize</literal> here, since they are generated by
+          NixOS.
+        '';
+      };
+
+      poolConfigs = mkOption {
+        type = types.attrsOf types.str;
+        default = {};
+        example = {
+          mypool = ''
+            listen = /run/phpfpm/mypool
+            user = nobody
+            pm = dynamic
+            pm.max_children = 75
+            pm.start_servers = 10
+            pm.min_spare_servers = 5
+            pm.max_spare_servers = 20
+            pm.max_requests = 500
+          '';
+        };
+        description = ''
+          A mapping between PHP FPM pool names and their configurations.
+          See the documentation on <literal>php-fpm.conf</literal> for
+          details on configuration directives. If no pools are defined,
+          the phpfpm service is disabled.
+        '';
+      };
+    };
+  };
+
+  config = mkIf (cfg.poolConfigs != {}) {
+
+    systemd.services.phpfpm = {
+      wantedBy = [ "multi-user.target" ];
+      preStart = ''
+        mkdir -p "${stateDir}"
+      '';
+      serviceConfig = {
+        ExecStart = "${pkgs.php54}/sbin/php-fpm -y ${cfgFile}";
+        PIDFile = pidFile;
+      };
+    };
+
+  };
+}