forked from lix-project/hydra
279 lines
8.1 KiB
Nix
279 lines
8.1 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.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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env =
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{ NIX_REMOTE = "daemon";
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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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HYDRA_PORT = "${toString cfg.port}";
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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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};
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serverEnv = env //
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{ HYDRA_LOGO = if cfg.logo != null then cfg.logo else "";
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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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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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default = "dbi:Pg:dbname=hydra;host=localhost;user=hydra;";
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example = "dbi:SQLite:/home/hydra/db/hydra.sqlite";
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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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hydra = mkOption {
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#default = pkgs.hydra;
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description = ''
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Location of hydra
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'';
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};
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hydraURL = mkOption {
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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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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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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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default = 5;
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description = ''
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Threshold of minimum disk space (G) 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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default = 2;
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description = ''
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Threshold of minimum disk space (G) 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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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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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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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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useWAL = mkOption {
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default = true;
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description = ''
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Whether to use SQLite's Write-Ahead Logging, which may improve performance.
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'';
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};
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debugServer = mkOption {
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default = false;
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type = types.bool;
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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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};
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};
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###### implementation
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config = mkIf cfg.enable {
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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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'';
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environment.systemPackages = [ cfg.hydra ];
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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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# Hydra needs caching of build failures.
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build-cache-failure = true
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build-poll-interval = 10
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# Online log compression makes it impossible to get the tail of
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# builds that are in progress.
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build-compress-log = false
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use-sqlite-wal = ${if cfg.useWAL then "true" else "false"}
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'';
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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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script = ''
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mkdir -p ${baseDir}/data
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chown hydra ${baseDir}/data
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ln -sf ${hydraConf} ${baseDir}/data/hydra.conf
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pass=$(HOME=/root ${pkgs.openssl}/bin/openssl rand -base64 32)
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if [ ! -f ${baseDir}/.pgpass ]; then
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${config.services.postgresql.package}/bin/psql postgres << EOF
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CREATE USER hydra PASSWORD '$pass';
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EOF
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${config.services.postgresql.package}/bin/createdb -O hydra hydra
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cat > ${baseDir}/.pgpass-tmp << EOF
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localhost:*:hydra:hydra:$pass
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EOF
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chown hydra ${baseDir}/.pgpass-tmp
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chmod 600 ${baseDir}/.pgpass-tmp
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mv ${baseDir}/.pgpass-tmp ${baseDir}/.pgpass
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fi
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${pkgs.shadow}/bin/su hydra -c ${cfg.hydra}/bin/hydra-init
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'';
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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};
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systemd.services."hydra-server" =
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{ wantedBy = [ "multi-user.target" ];
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wants = [ "hydra-init.service" ];
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after = [ "hydra-init.service" ];
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environment = serverEnv;
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serviceConfig =
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{ ExecStart = "@${cfg.hydra}/bin/hydra-server hydra-server -f -h '${cfg.listenHost}' --max_spare_servers 5 --max_servers 25 --max_requests 100${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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wants = [ "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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{ ExecStartPre = "${cfg.hydra}/bin/hydra-queue-runner --unlock";
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ExecStart = "@${cfg.hydra}/bin/hydra-queue-runner hydra-queue-runner";
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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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wants = [ "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 = "@${cfg.hydra}/bin/hydra-evaluator hydra-evaluator";
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User = "hydra";
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Restart = "always";
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};
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};
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systemd.services."hydra-update-gc-roots" =
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{ wants = [ "hydra-init.service" ];
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after = [ "hydra-init.service" ];
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environment = env;
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serviceConfig =
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{ ExecStart = "@${cfg.hydra}/bin/hydra-update-gc-roots hydra-update-gc-roots";
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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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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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systemctl stop hydra-evaluator
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fi
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'';
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compressLogs = pkgs.writeScript "compress-logs" ''
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#! ${pkgs.stdenv.shell} -e
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find /nix/var/log/nix/drvs \
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-type f -a ! -newermt 'last month' \
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-name '*.drv' -exec bzip2 -v {} +
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'';
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in
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[ "*/5 * * * * root ${checkSpace} &> ${baseDir}/data/checkspace.log"
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"15 5 * * * root ${compressLogs} &> ${baseDir}/data/compress.log"
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"15 2 * * * root ${pkgs.systemd}/bin/systemctl start hydra-update-gc-roots.service"
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];
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};
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}
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