Revert "phpfpm service: restructured pool configuration"

This reverts commit 6b3f5b5a42 because it
introduced a non-backwards compatible change in the phpfpm interface,
without really needing to. The new interface, if needed, can be re-added
alongside the old interface.

Commit 98e419c0e2 ("tt-rss service: init at 16.3")
depends on the new interface, so this commit updates the tt-rss service
to work with the old services.phpfpm.poolConfigs interface.

nixos/modules/module-list.nix

@@ -474,7 +474,7 @@
   ./services/web-servers/lighttpd/gitweb.nix
   ./services/web-servers/lighttpd/inginious.nix
   ./services/web-servers/nginx/default.nix
-  ./services/web-servers/phpfpm/default.nix
+  ./services/web-servers/phpfpm.nix
   ./services/web-servers/shellinabox.nix
   ./services/web-servers/tomcat.nix
   ./services/web-servers/uwsgi.nix

nixos/modules/services/web-apps/tt-rss.nix

@@ -17,6 +17,7 @@ let
     else cfg.database.port;
 
   poolName = "tt-rss";
+  phpfpmSocketName = "/var/run/phpfpm/${poolName}.sock";
   virtualHostName = "tt-rss";
 
   tt-rss-config = pkgs.writeText "config.php" ''
@@ -448,23 +449,21 @@ let
     root = "/var/lib/tt-rss";
   in mkIf cfg.enable {
 
-    services.phpfpm.pools = if cfg.pool == "${poolName}" then {
-      "${poolName}" =  {
-        listen = "/var/run/phpfpm/${poolName}.sock";
-        extraConfig = ''
-          listen.owner = nginx
-          listen.group = nginx
-          listen.mode = 0600
-          user = nginx
-          pm = dynamic
-          pm.max_children = 75
-          pm.start_servers = 10
-          pm.min_spare_servers = 5
-          pm.max_spare_servers = 20
-          pm.max_requests = 500
-          catch_workers_output = 1
-        '';
-      };
+    services.phpfpm.poolConfigs = if cfg.pool == "${poolName}" then {
+      "${poolName}" = ''
+        listen = "${phpfpmSocketName}";
+        listen.owner = nginx
+        listen.group = nginx
+        listen.mode = 0600
+        user = nginx
+        pm = dynamic
+        pm.max_children = 75
+        pm.start_servers = 10
+        pm.min_spare_servers = 5
+        pm.max_spare_servers = 20
+        pm.max_requests = 500
+        catch_workers_output = 1
+      '';
     } else {};
 
     # TODO: Re-enable after https://github.com/NixOS/nixpkgs/pull/15862 is merged
@@ -486,7 +485,7 @@ let
     #     locations."~ \.php$" = {
     #       extraConfig = ''
     #         fastcgi_split_path_info ^(.+\.php)(/.+)$;
-    #         fastcgi_pass unix:${config.services.phpfpm.pools."${cfg.pool}".listen};
+    #         fastcgi_pass unix:${phpfpmSocketName};
     #         fastcgi_index index.php;
     #         fastcgi_param SCRIPT_FILENAME ${root}/$fastcgi_script_name;
 

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

@@ -9,12 +9,6 @@ let
 
   pidFile = "${stateDir}/phpfpm.pid";
 
-  mkPool = n: p: ''
-    [${n}]
-    listen = ${p.listen}
-    ${p.extraConfig}
-  '';
-
   cfgFile = pkgs.writeText "phpfpm.conf" ''
     [global]
     pid = ${pidFile}
@@ -22,7 +16,7 @@ let
     daemonize = yes
     ${cfg.extraConfig}
 
-    ${concatStringsSep "\n" (mapAttrsToList mkPool cfg.pools)}
+    ${concatStringsSep "\n" (mapAttrsToList (n: v: "[${n}]\n${v}") cfg.poolConfigs)}
   '';
 
   phpIni = pkgs.writeText "php.ini" ''
@@ -67,19 +61,33 @@ in {
           "Options appended to the PHP configuration file <filename>php.ini</filename>.";
       };
 
-      pools = mkOption {
-        type = types.attrsOf (types.submodule (import ./pool-options.nix {
-          inherit lib;
-        }));
+      poolConfigs = mkOption {
+        type = types.attrsOf types.lines;
         default = {};
+        example = literalExample ''
+          { 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 = ''
-          If no pools are defined, the phpfpm service is disabled.
+          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.pools != {}) {
+  config = mkIf (cfg.poolConfigs != {}) {
 
     systemd.services.phpfpm = {
       wantedBy = [ "multi-user.target" ];

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

@@ -1,35 +0,0 @@
-{ lib }:
-
-with lib; {
-
-  options = {
-
-    listen = mkOption {
-      type = types.str;
-      example = "/path/to/unix/socket";
-      description = ''
-        The address on which to accept FastCGI requests.
-      '';
-    };
-
-    extraConfig = mkOption {
-      type = types.lines;
-      example = ''
-        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 = ''
-        Extra lines that go into the pool configuration.
-        See the documentation on <literal>php-fpm.conf</literal> for
-        details on configuration directives.
-      '';
-    };
-  };
-}
-