Add cgit nix file

1 files changed, 132 insertions, 0 deletions

diff --git a/cgit.nix b/cgit.nix
new file mode 100644
index 0000000..5391f3a
--- /dev/null
+++ b/cgit.nix
@@ -0,0 +1,132 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  globalConfig = config;
+  settingsFormat = {
+    type = with lib.types; let
+      value = oneOf [ int str ] // {
+        description = "INI-like atom (int or string)";
+      };
+      values = coercedTo value lib.singleton (listOf value) // {
+        description = value.description + " or a list of them for duplicate keys";
+      };
+    in
+    attrsOf (values);
+    generate = name: values:
+      pkgs.writeText name (lib.generators.toKeyValue { listsAsDuplicateKeys = true; } values);
+  };
+in
+{
+  options.services.nginx.virtualHosts = mkOption {
+    type = types.attrsOf (types.submodule ({ config, ... }:
+      let
+        cfg = config.cgit;
+
+        # These are the global options for this submodule, but for nicer UX they
+        # are inlined into the freeform settings.  Hence they MUST NOT INTERSECT
+        # with any settings from cgitrc!
+        options = {
+          enable = mkEnableOption "cgit";
+
+          location = mkOption {
+            default = "/";
+            type = types.str;
+            description = ''
+              Location to serve cgit on.
+            '';
+          };
+        };
+
+        # Remove the global options for serialization into cgitrc
+        settings = removeAttrs cfg (attrNames options);
+      in
+      {
+        options.cgit = mkOption {
+          type = types.submodule {
+            freeformType = settingsFormat.type;
+            inherit options;
+            config = {
+              css = mkDefault "/cgit.css";
+              logo = mkDefault "/cgit.png";
+              favicon = mkDefault "/favicon.ico";
+            };
+          };
+          default = { };
+          example = literalExample ''
+            {
+              enable = true;
+              virtual-root = "/";
+              source-filter = "''${pkgs.cgit}/lib/cgit/filters/syntax-highlighting.py";
+              about-filter = "''${pkgs.cgit}/lib/cgit/filters/about-formatting.sh";
+              cache-size = 1000;
+              scan-path = "/srv/git";
+              include = [
+                (builtins.toFile "cgitrc-extra-1" '''
+                  # Anything that has to be in a particular order
+                ''')
+                (builtins.toFile "cgitrc-extra-2" '''
+                  # Anything that has to be in a particular order
+                ''')
+              ];
+            }
+          '';
+          description = ''
+            Verbatim contents of the cgit runtime configuration file. Documentation
+            (with cgitrc example file) is available in "man cgitrc". Or online:
+            http://git.zx2c4.com/cgit/tree/cgitrc.5.txt
+          '';
+        };
+
+        config = let
+          location = removeSuffix "/" cfg.location;
+        in mkIf cfg.enable {
+
+          locations."${location}/" = {
+            root = "${pkgs.cgit}/cgit/";
+            tryFiles = "$uri @cgit";
+          };
+          locations."~ ^${location}/(cgit.(css|png)|favicon.ico|robots.txt)$" = {
+            alias = "${pkgs.cgit}/cgit/$1";
+          };
+          locations."@cgit" = {
+            extraConfig = ''
+              include ${pkgs.nginx}/conf/fastcgi_params;
+              fastcgi_param   CGIT_CONFIG     ${settingsFormat.generate "cgitrc" settings};
+              fastcgi_param   SCRIPT_FILENAME ${pkgs.cgit}/cgit/cgit.cgi;
+              fastcgi_param   QUERY_STRING    $args;
+              fastcgi_param   HTTP_HOST       $server_name;
+              fastcgi_pass    unix:${globalConfig.services.fcgiwrap.socketAddress};
+            '' + (
+              if cfg.location == "/"
+              then
+                ''
+                  fastcgi_param   PATH_INFO   $uri;
+                ''
+              else
+                ''
+                  fastcgi_split_path_info  ^(${location}/)(/?.+)$;
+                  fastcgi_param  PATH_INFO  $fastcgi_path_info;
+                ''
+            );
+          };
+        };
+
+      }));
+  };
+
+  config =
+    let
+      vhosts = config.services.nginx.virtualHosts;
+    in
+    mkIf (any (name: vhosts.${name}.cgit.enable) (attrNames vhosts)) {
+      # make the cgitrc manpage available
+      environment.systemPackages = [ pkgs.cgit ];
+
+      services.fcgiwrap.enable = true;
+    };
+
+  meta = {
+    maintainers = with lib.maintainers; [ afix-space hmenke ];
+  };
+}