From 15ede8a3a4e64f80416d70084d463a09286b5040 Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Thu, 18 Jun 2015 20:12:05 +0200
Subject: [PATCH] module/tv/git: add cgit

---
 modules/tv/git/cgit.nix    | 110 +++++++++++++++++++++++++++++++++++++
 modules/tv/git/default.nix |  33 ++++++++++-
 2 files changed, 140 insertions(+), 3 deletions(-)
 create mode 100644 modules/tv/git/cgit.nix

diff --git a/modules/tv/git/cgit.nix b/modules/tv/git/cgit.nix
new file mode 100644
index 000000000..edee19909
--- /dev/null
+++ b/modules/tv/git/cgit.nix
@@ -0,0 +1,110 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (builtins) attrValues filter getAttr;
+  inherit (lib) concatMapStringsSep mkIf optionalString;
+
+  cfg = config.services.git;
+
+  isPublicRepo = getAttr "public"; # TODO this is also in ./default.nix
+in
+
+{
+  config = mkIf cfg.cgit {
+
+    users.extraUsers = lib.singleton {
+      name = "fcgiwrap";
+      uid = 2851179180; # genid fcgiwrap
+      group = "fcgiwrap";
+      home = "/var/empty";
+    };
+
+    users.extraGroups = lib.singleton {
+      name = "fcgiwrap";
+      gid = 2851179180; # genid fcgiwrap
+    };
+
+    services.fcgiwrap = {
+      enable = true;
+      user = "fcgiwrap";
+      group = "fcgiwrap";
+      # socketAddress = "/run/fcgiwrap.sock" (default)
+      # socketType = "unix" (default)
+    };
+
+    environment.etc."cgitrc".text = ''
+      css=/cgit-static/cgit.css
+      logo=/cgit-static/cgit.png
+
+      # if you do not want that webcrawler (like google) index your site
+      robots=noindex, nofollow
+
+      virtual-root=/cgit
+
+      # TODO make this nicer
+      cache-root=/tmp/cgit
+
+      cache-size=1000
+      enable-commit-graph=1
+      enable-index-links=1
+      enable-index-owner=0
+      enable-log-filecount=1
+      enable-log-linecount=1
+      enable-remote-branches=1
+
+      root-title=repositories at ${config.networking.hostName}
+      root-desc=keep calm and engage
+
+      snapshots=0
+      max-stats=year
+
+      ${concatMapStringsSep "\n" (repo: ''
+        repo.url=${repo.name}
+        repo.path=${cfg.dataDir}/${repo.name}
+        ${optionalString (repo.desc != null) "repo.desc=${repo.desc}"}
+      '') (filter isPublicRepo (attrValues cfg.repos))}
+    '';
+
+    # TODO modular nginx configuration
+    services.nginx =
+      let
+        name = config.networking.hostName;
+        qname = "${name}.retiolum";
+      in
+        {
+          enable = true;
+          httpConfig = ''
+            include           ${pkgs.nginx}/conf/mime.types;
+            default_type      application/octet-stream;
+            sendfile          on;
+            keepalive_timeout 65;
+            gzip              on;
+            server {
+              listen 80;
+              server_name ${name} ${qname} localhost;
+              root ${pkgs.cgit}/cgit;
+
+              location /cgit-static {
+                rewrite ^/cgit-static(/.*)$ $1 break;
+                #expires 30d;
+              }
+
+              location /cgit {
+                include             ${pkgs.nginx}/conf/fastcgi_params;
+                fastcgi_param       SCRIPT_FILENAME $document_root/cgit.cgi;
+                #fastcgi_param       PATH_INFO       $uri;
+                fastcgi_split_path_info ^(/cgit/?)(.+)$;
+                fastcgi_param PATH_INFO $fastcgi_path_info;
+                fastcgi_param       QUERY_STRING    $args;
+                fastcgi_param       HTTP_HOST       $server_name;
+                fastcgi_pass        unix:${config.services.fcgiwrap.socketAddress};
+              }
+
+              location / {
+                return 404;
+              }
+            }
+          '';
+        };
+  };
+}
diff --git a/modules/tv/git/default.nix b/modules/tv/git/default.nix
index d264125dc..50e2f9206 100644
--- a/modules/tv/git/default.nix
+++ b/modules/tv/git/default.nix
@@ -2,8 +2,8 @@
 
 let
   inherit (builtins)
-    attrNames attrValues concatLists filter hasAttr head lessThan removeAttrs
-    tail toJSON typeOf;
+    attrNames attrValues concatLists getAttr filter hasAttr head lessThan
+    removeAttrs tail toJSON typeOf;
   inherit (lib)
     concatMapStringsSep concatStringsSep escapeShellArg hasPrefix
     literalExample makeSearchPath mapAttrsToList mkIf mkOption optionalString
@@ -16,6 +16,8 @@ let
 
   getName = x: x.name;
 
+  isPublicRepo = getAttr "public"; # TODO this is also in ./cgit.nix
+
   makeAuthorizedKey = command-script: user@{ name, pubkey }:
     # TODO assert name
     # TODO assert pubkey
@@ -78,12 +80,21 @@ in
 #       (or kill already connected users somehow)
 
 {
+  imports = [
+    ./cgit.nix
+  ];
+
   options.services.git = {
     enable = mkOption {
       type = types.bool;
       default = false;
       description = "Enable Git repository hosting.";
     };
+    cgit = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Enable cgit."; # TODO better desc; talk about nginx
+    };
     dataDir = mkOption {
       type = types.str;
       default = "/var/lib/git";
@@ -99,6 +110,13 @@ in
     repos = mkOption {
       type = types.attrsOf (types.submodule ({
         options = {
+          desc = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+            description = ''
+              Repository description.
+            '';
+          };
           name = mkOption {
             type = types.str;
             description = ''
@@ -111,6 +129,14 @@ in
               Repository-specific hooks.
             '';
           };
+          public = mkOption {
+            type = types.bool;
+            default = false;
+            description = ''
+              Allow everybody to read the repository via HTTP if cgit enabled.
+            '';
+            # TODO allow every configured user to fetch the repository via SSH.
+          };
         };
       }));
 
@@ -230,8 +256,9 @@ in
           ''
             reponame=${escapeShellArg repo.name}
             repodir=$dataDir/$reponame
+            mode=${toString (if isPublicRepo repo then 0711 else 0700)}
             if ! test -d "$repodir"; then
-              mkdir -m 0700 "$repodir"
+              mkdir -m "$mode" "$repodir"
               git init --bare --template=/var/empty "$repodir"
               chown -R git: "$repodir"
             fi