290 lines
8.3 KiB
Nix
290 lines
8.3 KiB
Nix
{ config, pkgs, lib ? pkgs.lib, ... }:
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with lib;
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let
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cfg = config.services.hydra;
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baseDir = "/var/lib/hydra";
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hydraConf = pkgs.writeScript "hydra.conf" cfg.extraConfig;
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hydraEnv =
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{ HYDRA_DBI = cfg.dbi;
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HYDRA_CONFIG = "${baseDir}/data/hydra.conf";
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HYDRA_DATA = "${baseDir}/data";
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};
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env =
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{ NIX_REMOTE = "daemon";
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OPENSSL_X509_CERT_FILE = "/etc/ssl/certs/ca-bundle.crt";
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GIT_SSL_CAINFO = "/etc/ssl/certs/ca-bundle.crt";
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} // hydraEnv // cfg.extraEnv;
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serverEnv = env //
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{ HYDRA_TRACKER = cfg.tracker;
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} // (optionalAttrs cfg.debugServer { DBIC_TRACE = 1; });
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in
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{
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###### interface
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options = {
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services.hydra = rec {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to run Hydra services.
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'';
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};
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dbi = mkOption {
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type = types.str;
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default = "dbi:Pg:dbname=hydra;user=hydra;";
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example = "dbi:Pg:dbname=hydra;host=postgres.example.org;user=foo;";
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description = ''
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The DBI string for Hydra database connection.
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'';
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};
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package = mkOption {
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type = types.path;
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#default = pkgs.hydra;
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description = "The Hydra package.";
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};
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hydraURL = mkOption {
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type = types.str;
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description = ''
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The base URL for the Hydra webserver instance. Used for links in emails.
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'';
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};
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listenHost = mkOption {
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type = types.str;
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default = "*";
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example = "localhost";
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description = ''
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The hostname or address to listen on or <literal>*</literal> to listen
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on all interfaces.
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'';
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};
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port = mkOption {
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type = types.int;
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default = 3000;
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description = ''
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TCP port the web server should listen to.
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'';
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};
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minimumDiskFree = mkOption {
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type = types.int;
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default = 5;
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description = ''
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Threshold of minimum disk space (GiB) to determine if queue runner should run or not.
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'';
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};
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minimumDiskFreeEvaluator = mkOption {
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type = types.int;
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default = 2;
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description = ''
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Threshold of minimum disk space (GiB) to determine if evaluator should run or not.
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'';
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};
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notificationSender = mkOption {
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type = types.str;
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description = ''
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Sender email address used for email notifications.
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'';
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};
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tracker = mkOption {
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type = types.str;
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default = "";
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description = ''
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Piece of HTML that is included on all pages.
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'';
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};
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logo = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = ''
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File name of an alternate logo to be displayed on the web pages.
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'';
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};
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debugServer = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to run the server in debug mode";
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};
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extraConfig = mkOption {
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type = types.lines;
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description = "Extra lines for the hydra config";
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};
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extraEnv = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = "Extra environment variables for Hydra";
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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services.hydra.package = mkDefault ((import ./release.nix {}).build.x86_64-linux);
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services.hydra.extraConfig =
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''
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using_frontend_proxy 1
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base_uri ${cfg.hydraURL}
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notification_sender ${cfg.notificationSender}
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max_servers 25
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${optionalString (cfg.logo != null) ''
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hydra_logo ${cfg.logo}
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''}
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'';
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environment.systemPackages = [ cfg.package ];
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environment.variables = hydraEnv;
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users.extraUsers.hydra =
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{ description = "Hydra";
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home = baseDir;
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createHome = true;
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useDefaultShell = true;
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};
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nix.extraOptions = ''
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gc-keep-outputs = true
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gc-keep-derivations = true
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# The default (`true') slows Nix down a lot since the build farm
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# has so many GC roots.
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gc-check-reachability = false
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'';
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nix.trustedUsers = [ "hydra" ];
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systemd.services.hydra-init =
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{ wantedBy = [ "multi-user.target" ];
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requires = [ "postgresql.service" ];
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after = [ "postgresql.service" ];
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environment = env;
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preStart = ''
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mkdir -m 0700 -p ${baseDir}/data
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chown hydra ${baseDir}/data
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ln -sf ${hydraConf} ${baseDir}/data/hydra.conf
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${optionalString (cfg.dbi == "dbi:Pg:dbname=hydra;user=hydra;") ''
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if ! [ -e ${baseDir}/.db-created ]; then
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${config.services.postgresql.package}/bin/createuser hydra
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${config.services.postgresql.package}/bin/createdb -O hydra hydra
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touch ${baseDir}/.db-created
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fi
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''}
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'';
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serviceConfig.ExecStart = "${cfg.package}/bin/hydra-init";
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serviceConfig.PermissionsStartOnly = true;
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serviceConfig.User = "hydra";
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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};
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systemd.services.hydra-server =
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{ wantedBy = [ "multi-user.target" ];
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requires = [ "hydra-init.service" ];
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after = [ "hydra-init.service" ];
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environment = serverEnv // { COLUMNS = "80"; };
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serviceConfig =
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{ ExecStart =
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"@${cfg.package}/bin/hydra-server hydra-server -f -h '${cfg.listenHost}' "
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+ "-p ${toString cfg.port} --max_spare_servers 5 --max_servers 25 "
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+ "--max_requests 100 ${optionalString cfg.debugServer "-d"}";
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User = "hydra";
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Restart = "always";
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};
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};
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systemd.services.hydra-queue-runner =
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{ wantedBy = [ "multi-user.target" ];
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requires = [ "hydra-init.service" ];
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after = [ "hydra-init.service" "network.target" ];
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path = [ pkgs.nettools ];
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environment = env;
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serviceConfig =
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{ ExecStart = "@${cfg.package}/bin/hydra-queue-runner hydra-queue-runner";
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ExecStopPost = "${cfg.package}/bin/hydra-queue-runner --unlock";
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User = "hydra";
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Restart = "always";
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};
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};
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systemd.services.hydra-evaluator =
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{ wantedBy = [ "multi-user.target" ];
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requires = [ "hydra-init.service" ];
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after = [ "hydra-init.service" "network.target" ];
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path = [ pkgs.nettools ];
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environment = env;
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serviceConfig =
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{ ExecStart = "@${cfg.package}/bin/hydra-evaluator hydra-evaluator";
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User = "hydra";
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Restart = "always";
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};
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};
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systemd.services.hydra-update-gc-roots =
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{ requires = [ "hydra-init.service" ];
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after = [ "hydra-init.service" ];
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environment = env;
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serviceConfig =
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{ ExecStart = "@${cfg.package}/bin/hydra-update-gc-roots hydra-update-gc-roots";
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User = "hydra";
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};
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startAt = "02:15";
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};
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systemd.services.hydra-send-stats =
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{ wantedBy = [ "multi-user.target" ];
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after = [ "hydra-init.service" ];
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environment = env;
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serviceConfig =
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{ ExecStart = "@${cfg.package}/bin/hydra-send-stats hydra-send-stats";
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User = "hydra";
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};
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};
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services.cron.systemCronJobs =
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let
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# If there is less than ... GiB of free disk space, stop the queue
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# to prevent builds from failing or aborting.
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checkSpace = pkgs.writeScript "hydra-check-space"
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''
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#! ${pkgs.stdenv.shell}
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if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFree} * 1024**3)) ]; then
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echo "stopping Hydra queue runner due to lack of free space..."
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systemctl stop hydra-queue-runner
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fi
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if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFreeEvaluator} * 1024**3)) ]; then
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echo "stopping Hydra evaluator due to lack of free space..."
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systemctl stop hydra-evaluator
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fi
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'';
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in
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[ "*/5 * * * * root ${checkSpace} &> ${baseDir}/data/checkspace.log"
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];
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};
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}
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