nixos/modules/services/misc/sourcehut/git.nix

   1 { config, lib, pkgs, ... }:
   2
   3 with lib;
   4 let
   5   cfg = config.services.sourcehut;
   6   scfg = cfg.git;
   7   iniKey = "git.sr.ht";
   8   statePath = "/var/lib/sourcehut/gitsrht";
   9
  10   rcfg = config.services.redis;
  11   drv = pkgs.sourcehut.gitsrht;
  12 in
  13 {
  14   options.services.sourcehut.git = {
  15     enable = mkEnableOption "git service";
  16
  17     user = mkOption {
  18       type = types.str;
  19       visible = false;
  20       internal = true;
  21       readOnly = true;
  22       default = "git";
  23       description = ''
  24         User for git.sr.ht.
  25       '';
  26     };
  27
  28     port = mkOption {
  29       type = types.port;
  30       default = 5001;
  31       description = ''
  32         Port on which the "git" module should listen.
  33       '';
  34     };
  35
  36     database = mkOption {
  37       type = types.str;
  38       default = "git.sr.ht";
  39       description = ''
  40         PostgreSQL database name for git.sr.ht.
  41       '';
  42     };
  43
  44     package = mkOption {
  45       type = types.package;
  46       default = pkgs.git;
  47       example = literalExample "pkgs.gitFull";
  48       description = ''
  49         Git package for git.sr.ht. This can help silence collisions.
  50       '';
  51     };
  52   };
  53
  54   config = with scfg; lib.mkIf (cfg.enable && scfg.enable) {
  55     # sshd refuses to run with `Unsafe AuthorizedKeysCommand ... bad ownership or modes for directory /nix/store`
  56     environment.etc."ssh/gitsrht-dispatch" = {
  57       mode = "0755";
  58       text = ''
  59         #! ${pkgs.stdenv.shell}
  60         ${cfg.python}/bin/gitsrht-dispatch "$@"
  61       '';
  62     };
  63
  64     # Needs this in the $PATH when sshing into the server
  65     environment.systemPackages = [ cfg.git.package ];
  66
  67     users = {
  68       users = {
  69         "${user}" = {
  70           isSystemUser = true;
  71           group = user;
  72           # https://stackoverflow.com/questions/22314298/git-push-results-in-fatal-protocol-error-bad-line-length-character-this
  73           # Probably could use gitsrht-shell if output is restricted to just parameters...
  74           shell = pkgs.bash;
  75           description = "git.sr.ht user";
  76         };
  77       };
  78
  79       groups = {
  80         "${user}" = { };
  81       };
  82     };
  83
  84     services = {
  85       cron.systemCronJobs = [ "*/20 * * * * ${cfg.python}/bin/gitsrht-periodic" ];
  86       fcgiwrap.enable = true;
  87
  88       openssh.authorizedKeysCommand = ''/etc/ssh/gitsrht-dispatch "%u" "%h" "%t" "%k"'';
  89       openssh.authorizedKeysCommandUser = "root";
  90       openssh.extraConfig = ''
  91         PermitUserEnvironment SRHT_*
  92       '';
  93
  94       postgresql = {
  95         authentication = ''
  96           local ${database} ${user} trust
  97         '';
  98         ensureDatabases = [ database ];
  99         ensureUsers = [
 100           {
 101             name = user;
 102             ensurePermissions = { "DATABASE \"${database}\"" = "ALL PRIVILEGES"; };
 103           }
 104         ];
 105       };
 106     };
 107
 108     systemd = {
 109       tmpfiles.rules = [
 110         # /var/log is owned by root
 111         "f /var/log/git-srht-shell 0644 ${user} ${user} -"
 112
 113         "d ${cfg.settings."${iniKey}".repos} 2755 ${user} ${user} -"
 114       ];
 115
 116       services = {
 117         gitsrht = import ./service.nix { inherit config pkgs lib; } scfg drv iniKey {
 118           after = [ "redis.service" "postgresql.service" "network.target" ];
 119           requires = [ "redis.service" "postgresql.service" ];
 120           wantedBy = [ "multi-user.target" ];
 121
 122           # Needs internally to create repos at the very least
 123           path = [ pkgs.git ];
 124           description = "git.sr.ht website service";
 125
 126           serviceConfig.ExecStart = "${cfg.python}/bin/gunicorn ${drv.pname}.app:app -b ${cfg.address}:${toString port}";
 127         };
 128
 129         gitsrht-webhooks = {
 130           after = [ "postgresql.service" "network.target" ];
 131           requires = [ "postgresql.service" ];
 132           wantedBy = [ "multi-user.target" ];
 133
 134           description = "git.sr.ht webhooks service";
 135           serviceConfig = {
 136             Type = "simple";
 137             User = user;
 138             Restart = "always";
 139           };
 140
 141           serviceConfig.ExecStart = "${cfg.python}/bin/celery -A ${drv.pname}.webhooks worker --loglevel INFO --pool eventlet";
 142         };
 143       };
 144     };
 145
 146     services.sourcehut.settings = {
 147       # The authorized keys hook uses this to dispatch to various handlers
 148       # The format is a program to exec into as the key, and the user to match as the
 149       # value. When someone tries to log in as this user, this program is executed
 150       # and is expected to omit an AuthorizedKeys file.
 151       #
 152       # Discard of the string context is in order to allow derivation-derived strings.
 153       # This is safe if the relevant package is installed which will be the case if the setting is utilized.
 154       "git.sr.ht::dispatch".${builtins.unsafeDiscardStringContext "${pkgs.sourcehut.gitsrht}/bin/gitsrht-keys"} = mkDefault "${user}:${user}";
 155     };
 156
 157     services.nginx.virtualHosts."git.${cfg.originBase}" = {
 158       forceSSL = true;
 159       locations."/".proxyPass = "http://${cfg.address}:${toString port}";
 160       locations."/query".proxyPass = cfgIni."meta.sr.ht".api-origin;
 161       locations."/static".root = "${pkgs.sourcehut.gitsrht}/${pkgs.sourcehut.python.sitePackages}/gitsrht";
 162       extraConfig = ''
 163             location = /authorize {
 164             proxy_pass http://${cfg.address}:${toString port};
 165             proxy_pass_request_body off;
 166             proxy_set_header Content-Length "";
 167             proxy_set_header X-Original-URI $request_uri;
 168         }
 169             location ~ ^/([^/]+)/([^/]+)/(HEAD|info/refs|objects/info/.*|git-upload-pack).*$ {
 170                 auth_request /authorize;
 171                 root /var/lib/git;
 172                 fastcgi_pass unix:/run/fcgiwrap.sock;
 173                 fastcgi_param SCRIPT_FILENAME ${pkgs.git}/bin/git-http-backend;
 174                 fastcgi_param PATH_INFO $uri;
 175                 fastcgi_param GIT_PROJECT_ROOT $document_root;
 176                 fastcgi_read_timeout 500s;
 177                 include ${pkgs.nginx}/conf/fastcgi_params;
 178                 gzip off;
 179             }
 180       '';
 181
 182     };
 183   };
 184 }