Author: rob
Date: Thu May 5 06:27:38 2011
New Revision: 27155
URL: https://svn.nixos.org/websvn/nix/?rev=27155&sc=1
Log:
Added:
hydra/trunk/hydra-module.nix
Added: hydra/trunk/hydra-module.nix
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ hydra/trunk/hydra-module.nix Thu May 5 06:27:38 2011 (r27155)
@@ -0,0 +1,218 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+ cfg = config.services.hydra;
+
+ hydraConf = pkgs.writeScript "hydra.conf"
+ ''
+ using_frontend_proxy 1
+ base_uri ${cfg.hydraURL}
+ notification_sender ${cfg.notificationSender}
+ max_servers 25
+ '';
+
+ env = ''export NIX_REMOTE=daemon ''
+ + ''HYDRA_DBI="${cfg.dbi}" ''
+ + ''HYDRA_CONFIG=${cfg.baseDir}/data/hydra.conf ''
+ + ''HYDRA_DATA=${cfg.baseDir}/data ''
+ + ''HYDRA_TRACKER="${cfg.tracker}" ;'';
+
+in
+
+{
+ ###### interface
+ options = {
+ services.hydra = rec {
+
+ enable = mkOption {
+ default = false;
+ description = ''
+ Whether to run Hydra services.
+ '';
+ };
+
+ baseDir = mkOption {
+ default = "/home/${user.default}";
+ description = ''
+ The directory holding configuration, logs and temporary files.
+ '';
+ };
+
+ user = mkOption {
+ default = "hydra";
+ description = ''
+ The user the Hydra services should run as.
+ '';
+ };
+
+ dbi = mkOption {
+ default = "dbi:Pg:dbname=hydra;host=localhost;user=root;";
+ description = ''
+ The DBI string for Hydra database connection
+ '';
+ };
+
+ hydra = mkOption {
+ default = pkgs.hydra;
+ description = ''
+ Location of hydra
+ '';
+ };
+
+ hydraURL = mkOption {
+ default = "http://hydra.nixos.org";;
+ description = ''
+ The base URL for the Hydra webserver instance. Used for links in
emails.
+ '';
+ };
+
+ minimumDiskFree = mkOption {
+ default = 5;
+ description = ''
+ Threshold of minimum disk space (G) to determine if queue runner
should run or not.
+ '';
+ };
+
+ minimumDiskFreeEvaluator = mkOption {
+ default = 2;
+ description = ''
+ Threshold of minimum disk space (G) to determine if evaluator should
run or not.
+ '';
+ };
+
+ notificationSender = mkOption {
+ default = "e.dols...@tudelft.nl";
+ description = ''
+ Sender email address used for email notifications.
+ '';
+ };
+
+ tracker = mkOption {
+ default = "";
+ description = ''
+ Piece of HTML that is included on all pages.
+ '';
+ };
+
+ autoStart = mkOption {
+ default = true;
+ description = ''
+ If hydra upstart jobs should start automatically.
+ '';
+ };
+
+ };
+
+ };
+
+
+ ###### implementation
+
+ config = mkIf cfg.enable {
+ environment.systemPackages = [ cfg.hydra ];
+
+ users.extraUsers = [
+ { name = cfg.user;
+ description = "Hydra";
+ home = cfg.baseDir;
+ createHome = true;
+ useDefaultShell = true;
+ }
+ ];
+
+ # Should these 3 really be here?
+ nix.maxJobs = 0;
+ nix.distributedBuilds = true;
+ nix.manualNixMachines = true;
+
+ nix.useChroot = true;
+ nix.nrBuildUsers = 100;
+
+ nix.gc.automatic = true;
+ # $3 / $4 don't always work depending on length of device name
+ nix.gc.options = ''--max-freed "$((200 * 1024**3 - 1024 * $(df /nix/store
| tail -n 1 | awk '{ print $3 }')))"'';
+
+ nix.extraOptions = ''
+ gc-keep-outputs = true
+ gc-keep-derivations = true
+
+ # The default (`true') slows Nix down a lot since the build farm
+ # has so many GC roots.
+ gc-check-reachability = false
+
+ # Hydra needs caching of build failures.
+ build-cache-failure = true
+
+ build-poll-interval = 10
+
+ use-sqlite-wal = false
+ '';
+
+ jobs.hydra_init =
+ { description = "hydra-init";
+ startOn = "started network-interfaces";
+ preStart = ''
+ mkdir -p ${cfg.baseDir}/data
+ chown ${cfg.user} ${cfg.baseDir}/data
+ ln -sf ${hydraConf} ${cfg.baseDir}/data/hydra.conf
+ '';
+ exec = ''
+ echo done
+ '';
+ };
+
+ jobs.hydra_server =
+ { description = "hydra-server";
+ startOn = if cfg.autoStart then "started network-interfaces
hydra-init" else "never";
+ exec = ''
+ ${pkgs.su}/bin/su - ${cfg.user} -c '${env}
${cfg.hydra}/bin/hydra_server.pl > ${cfg.baseDir}/data/server.log 2>&1'
+ '';
+ };
+
+ jobs.hydra_queue_runner =
+ { description = "hydra-queue-runner";
+ startOn = if cfg.autoStart then "started network-interfaces
hydra-init" else "never";
+ preStart = "${pkgs.su}/bin/su - ${cfg.user} -c '${env}
${cfg.hydra}/bin/hydra_queue_runner.pl --unlock'";
+ exec = ''
+ ${pkgs.su}/bin/su - ${cfg.user} -c '${env} nice -n 8
${cfg.hydra}/bin/hydra_queue_runner.pl > ${cfg.baseDir}/data/queue_runner.log
2>&1'
+ '';
+ };
+
+ jobs.hydra_evaluator =
+ { description = "hydra-evaluator";
+ startOn = if cfg.autoStart then "started network-interfaces
hydra-init" else "never";
+ exec = ''
+ ${pkgs.su}/bin/su - ${cfg.user} -c '${env} nice -n 5
${cfg.hydra}/bin/hydra_evaluator.pl > ${cfg.baseDir}/data/evaluator.log 2>&1'
+ '';
+ };
+
+ services.cron.systemCronJobs =
+ let
+ # If there is less than ... GiB of free disk space, stop the queue
+ # to prevent builds from failing or aborting.
+ checkSpace = pkgs.writeScript "hydra-check-space"
+ ''
+ #! /bin/sh
+ if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S'
/nix/store))) -lt $((${toString cfg.minimumDiskFree} * 1024**3)) ]; then
+ stop hydra-queue-runner
+ fi
+ if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S'
/nix/store))) -lt $((${toString cfg.minimumDiskFreeEvaluator} * 1024**3)) ];
then
+ stop hydra-evaluator
+ fi
+ '';
+ compressLogs = pkgs.writeScript "compress-logs" ''
+ #! /bin/sh -e
+ touch -d 'last month' r
+ find /nix/var/log/nix/drvs -type f -a ! -newer r -name '*.drv' |
xargs bzip2 -v
+ '';
+ in
+ [ "*/5 * * * * root ${checkSpace} &>
${cfg.baseDir}/data/checkspace.log"
+ "15 5 * * * root ${compressLogs} &>
${cfg.baseDir}/data/compress.log"
+ "15 02 * * * ${cfg.user} ${env}
${cfg.hydra}/bin/hydra_update_gc_roots.pl &> ${cfg.baseDir}/data/gc-roots.log"
+ ];
+
+ };
+}
+
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