hydra/hydra-module.nix
Antoine Eiche 8a0a5ec3a3 Create extension pg_trgm in the NixOS module
The creation of the `pg_trgm` extension needs superuser power. So,
this patch makes the extension creation in the Hydra NixOS module when
a local database is used.

If it is not possible to create this extension (remote database for
instance with nosuperuser), the creation of the `pg_trgm` index is
skipped (this index speedup queries on builds.drvpath) and warnings
are emitted:

    initialising the Hydra database schema...
    WARNING:  Can not create extension pg_trgm: permission denied to create extension "pg_trgm"
    WARNING:  HINT: Temporary provide superuser role to your Hydra Postgresql user and run the script src/sql/upgrade-57.sql
    WARNING:  The pg_trgm index on builds.drvpath has been skipped (slower complex queries on builds.drvpath)

This allows to keep smooth migrations: the migration process doesn't
require a manual step (but this manual step is recommended on big
remote databases).
2019-07-25 16:19:33 +02:00

431 lines
13 KiB
Nix

{ config, pkgs, lib ? pkgs.lib, ... }:
with lib;
let
cfg = config.services.hydra-dev;
baseDir = "/var/lib/hydra";
hydraConf = pkgs.writeScript "hydra.conf" cfg.extraConfig;
hydraEnv =
{ HYDRA_DBI = cfg.dbi;
HYDRA_CONFIG = "${baseDir}/hydra.conf";
HYDRA_DATA = "${baseDir}";
};
env =
{ NIX_REMOTE = "daemon";
SSL_CERT_FILE = "/etc/ssl/certs/ca-certificates.crt"; # Remove in 16.03
PGPASSFILE = "${baseDir}/pgpass";
NIX_REMOTE_SYSTEMS = concatStringsSep ":" cfg.buildMachinesFiles;
} // optionalAttrs (cfg.smtpHost != null) {
EMAIL_SENDER_TRANSPORT = "SMTP";
EMAIL_SENDER_TRANSPORT_host = cfg.smtpHost;
} // hydraEnv // cfg.extraEnv;
serverEnv = env //
{ HYDRA_TRACKER = cfg.tracker;
COLUMNS = "80";
PGPASSFILE = "${baseDir}/pgpass-www"; # grrr
XDG_CACHE_HOME = "${baseDir}/www/.cache";
} // (optionalAttrs cfg.debugServer { DBIC_TRACE = "1"; });
localDB = "dbi:Pg:dbname=hydra;user=hydra;";
haveLocalDB = cfg.dbi == localDB;
in
{
###### interface
options = {
services.hydra-dev = rec {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to run Hydra services.
'';
};
dbi = mkOption {
type = types.str;
default = localDB;
example = "dbi:Pg:dbname=hydra;host=postgres.example.org;user=foo;";
description = ''
The DBI string for Hydra database connection.
'';
};
package = mkOption {
type = types.path;
#default = pkgs.hydra;
description = "The Hydra package.";
};
hydraURL = mkOption {
type = types.str;
description = ''
The base URL for the Hydra webserver instance. Used for links in emails.
'';
};
listenHost = mkOption {
type = types.str;
default = "*";
example = "localhost";
description = ''
The hostname or address to listen on or <literal>*</literal> to listen
on all interfaces.
'';
};
port = mkOption {
type = types.int;
default = 3000;
description = ''
TCP port the web server should listen to.
'';
};
minimumDiskFree = mkOption {
type = types.int;
default = 0;
description = ''
Threshold of minimum disk space (GiB) to determine if the queue runner should run or not.
'';
};
minimumDiskFreeEvaluator = mkOption {
type = types.int;
default = 0;
description = ''
Threshold of minimum disk space (GiB) to determine if the evaluator should run or not.
'';
};
notificationSender = mkOption {
type = types.str;
description = ''
Sender email address used for email notifications.
'';
};
smtpHost = mkOption {
type = types.nullOr types.str;
default = null;
example = ["localhost"];
description = ''
Hostname of the SMTP server to use to send email.
'';
};
tracker = mkOption {
type = types.str;
default = "";
description = ''
Piece of HTML that is included on all pages.
'';
};
logo = mkOption {
type = types.nullOr types.path;
default = null;
description = ''
Path to a file containing the logo of your Hydra instance.
'';
};
debugServer = mkOption {
type = types.bool;
default = false;
description = "Whether to run the server in debug mode.";
};
extraConfig = mkOption {
type = types.lines;
description = "Extra lines for the Hydra configuration.";
};
extraEnv = mkOption {
type = types.attrsOf types.str;
default = {};
description = "Extra environment variables for Hydra.";
};
gcRootsDir = mkOption {
type = types.path;
default = "/nix/var/nix/gcroots/hydra";
description = "Directory that holds Hydra garbage collector roots.";
};
buildMachinesFiles = mkOption {
type = types.listOf types.path;
default = [ "/etc/nix/machines" ];
example = [ "/etc/nix/machines" "/var/lib/hydra/provisioner/machines" ];
description = "List of files containing build machines.";
};
useSubstitutes = mkOption {
type = types.bool;
default = false;
description = ''
Whether to use binary caches for downloading store paths. Note that
binary substitutions trigger (a potentially large number of) additional
HTTP requests that slow down the queue monitor thread significantly.
Also, this Hydra instance will serve those downloaded store paths to
its users with its own signature attached as if it had built them
itself, so don't enable this feature unless your active binary caches
are absolute trustworthy.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
users.extraGroups.hydra = { };
users.extraUsers.hydra =
{ description = "Hydra";
group = "hydra";
createHome = true;
home = baseDir;
useDefaultShell = true;
};
users.extraUsers.hydra-queue-runner =
{ description = "Hydra queue runner";
group = "hydra";
useDefaultShell = true;
home = "${baseDir}/queue-runner"; # really only to keep SSH happy
};
users.extraUsers.hydra-www =
{ description = "Hydra web server";
group = "hydra";
useDefaultShell = true;
};
nix.trustedUsers = [ "hydra-queue-runner" ];
services.hydra-dev.package = mkDefault ((import ./release.nix {}).build.x86_64-linux);
services.hydra-dev.extraConfig =
''
using_frontend_proxy = 1
base_uri = ${cfg.hydraURL}
notification_sender = ${cfg.notificationSender}
max_servers = 25
compress_num_threads = 0
${optionalString (cfg.logo != null) ''
hydra_logo = ${cfg.logo}
''}
gc_roots_dir = ${cfg.gcRootsDir}
use-substitutes = ${if cfg.useSubstitutes then "1" else "0"}
'';
environment.systemPackages = [ cfg.package ];
environment.variables = hydraEnv;
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
'';
systemd.services.hydra-init =
{ wantedBy = [ "multi-user.target" ];
requires = optional haveLocalDB "postgresql.service";
after = optional haveLocalDB "postgresql.service";
environment = env;
path = [ pkgs.utillinux ];
preStart = ''
mkdir -p ${baseDir}
chown hydra.hydra ${baseDir}
chmod 0750 ${baseDir}
ln -sf ${hydraConf} ${baseDir}/hydra.conf
mkdir -m 0700 -p ${baseDir}/www
chown hydra-www.hydra ${baseDir}/www
mkdir -m 0700 -p ${baseDir}/queue-runner
mkdir -m 0750 -p ${baseDir}/build-logs
chown hydra-queue-runner.hydra ${baseDir}/queue-runner ${baseDir}/build-logs
${optionalString haveLocalDB ''
if ! [ -e ${baseDir}/.db-created ]; then
runuser -u ${config.services.postgresql.superUser} -- ${config.services.postgresql.package}/bin/createuser hydra
runuser -u ${config.services.postgresql.superUser} -- ${config.services.postgresql.package}/bin/createdb -O hydra hydra
touch ${baseDir}/.db-created
fi
echo "create extension if not exists pg_trgm" | runuser -u ${config.services.postgresql.superUser} -- ${config.services.postgresql.package}/bin/psql hydra
''}
if [ ! -e ${cfg.gcRootsDir} ]; then
# Move legacy roots directory.
if [ -e /nix/var/nix/gcroots/per-user/hydra/hydra-roots ]; then
mv /nix/var/nix/gcroots/per-user/hydra/hydra-roots ${cfg.gcRootsDir}
fi
mkdir -p ${cfg.gcRootsDir}
fi
# Move legacy hydra-www roots.
if [ -e /nix/var/nix/gcroots/per-user/hydra-www/hydra-roots ]; then
find /nix/var/nix/gcroots/per-user/hydra-www/hydra-roots/ -type f \
| xargs -r mv -f -t ${cfg.gcRootsDir}/
rmdir /nix/var/nix/gcroots/per-user/hydra-www/hydra-roots
fi
chown hydra.hydra ${cfg.gcRootsDir}
chmod 2775 ${cfg.gcRootsDir}
'';
serviceConfig.ExecStart = "${cfg.package}/bin/hydra-init";
serviceConfig.PermissionsStartOnly = true;
serviceConfig.User = "hydra";
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
};
systemd.services.hydra-server =
{ wantedBy = [ "multi-user.target" ];
requires = [ "hydra-init.service" ];
after = [ "hydra-init.service" ];
environment = serverEnv;
restartTriggers = [ hydraConf ];
serviceConfig =
{ ExecStart =
"@${cfg.package}/bin/hydra-server hydra-server -f -h '${cfg.listenHost}' "
+ "-p ${toString cfg.port} --max_spare_servers 5 --max_servers 25 "
+ "--max_requests 100 ${optionalString cfg.debugServer "-d"}";
User = "hydra-www";
PermissionsStartOnly = true;
Restart = "always";
};
};
systemd.services.hydra-queue-runner =
{ wantedBy = [ "multi-user.target" ];
requires = [ "hydra-init.service" ];
after = [ "hydra-init.service" "network.target" ];
path = [ cfg.package pkgs.nettools pkgs.openssh pkgs.bzip2 config.nix.package ];
restartTriggers = [ hydraConf ];
environment = env // {
PGPASSFILE = "${baseDir}/pgpass-queue-runner"; # grrr
IN_SYSTEMD = "1"; # to get log severity levels
};
serviceConfig =
{ ExecStart = "@${cfg.package}/bin/hydra-queue-runner hydra-queue-runner -v";
ExecStopPost = "${cfg.package}/bin/hydra-queue-runner --unlock";
User = "hydra-queue-runner";
Restart = "always";
# Ensure we can get core dumps.
LimitCORE = "infinity";
WorkingDirectory = "${baseDir}/queue-runner";
};
};
systemd.services.hydra-evaluator =
{ wantedBy = [ "multi-user.target" ];
requires = [ "hydra-init.service" ];
restartTriggers = [ hydraConf ];
after = [ "hydra-init.service" "network.target" ];
path = with pkgs; [ nettools cfg.package jq ];
environment = env;
serviceConfig =
{ ExecStart = "@${cfg.package}/bin/hydra-evaluator hydra-evaluator";
ExecStopPost = "${cfg.package}/bin/hydra-evaluator --unlock";
User = "hydra";
Restart = "always";
WorkingDirectory = baseDir;
};
};
systemd.services.hydra-update-gc-roots =
{ requires = [ "hydra-init.service" ];
after = [ "hydra-init.service" ];
environment = env;
serviceConfig =
{ ExecStart = "@${cfg.package}/bin/hydra-update-gc-roots hydra-update-gc-roots";
User = "hydra";
};
startAt = "2,14:15";
};
systemd.services.hydra-send-stats =
{ wantedBy = [ "multi-user.target" ];
after = [ "hydra-init.service" ];
environment = env;
serviceConfig =
{ ExecStart = "@${cfg.package}/bin/hydra-send-stats hydra-send-stats";
User = "hydra";
};
};
# If there is less than a certain amount of free disk space, stop
# the queue/evaluator to prevent builds from failing or aborting.
systemd.services.hydra-check-space =
{ script =
''
if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFree} * 1024**3)) ]; then
echo "stopping Hydra queue runner due to lack of free space..."
systemctl 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
echo "stopping Hydra evaluator due to lack of free space..."
systemctl stop hydra-evaluator
fi
'';
startAt = "*:0/5";
};
# Periodically compress build logs. The queue runner compresses
# logs automatically after a step finishes, but this doesn't work
# if the queue runner is stopped prematurely.
systemd.services.hydra-compress-logs =
{ path = [ pkgs.bzip2 ];
script =
''
find /var/lib/hydra/build-logs -type f -name "*.drv" -mtime +3 -size +0c | xargs -r bzip2 -v -f
'';
startAt = "Sun 01:45";
};
services.postgresql.enable = mkIf haveLocalDB true;
services.postgresql.identMap = optionalString haveLocalDB
''
hydra-users hydra hydra
hydra-users hydra-queue-runner hydra
hydra-users hydra-www hydra
hydra-users root hydra
# The postgres user is used to create the pg_trgm extension for the hydra database
hydra-users postgres postgres
'';
services.postgresql.authentication = optionalString haveLocalDB
''
local hydra all ident map=hydra-users
'';
};
}