buildbot-nix/nix/coordinator.nix

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{ config
, pkgs
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, lib
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, ...
}:
let
cfg = config.services.buildbot-nix.coordinator;
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in
{
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options = {
services.buildbot-nix.coordinator = {
enable = lib.mkEnableOption "buildbot-coordinator";
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dbUrl = lib.mkOption {
type = lib.types.str;
default = "postgresql://@/buildbot";
description = "Postgresql database url";
};
workersFile = lib.mkOption {
type = lib.types.path;
description = "File containing a list of nix workers";
};
oauth2SecretFile = lib.mkOption {
type = lib.types.path;
description = "File containing an OAuth 2 client secret";
};
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buildSystems = lib.mkOption {
type = lib.types.listOf lib.types.str;
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default = [ pkgs.hostPlatform.system ];
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description = "Systems that we will be build";
};
evalMaxMemorySize = lib.mkOption {
type = lib.types.str;
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default = "2048";
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description = ''
Maximum memory size for nix-eval-jobs (in MiB) per
worker. After the limit is reached, the worker is
restarted.
'';
};
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evalWorkerCount = lib.mkOption {
type = lib.types.nullOr lib.types.int;
default = null;
description = ''
Number of nix-eval-jobs worker processes. If null, the number of cores is used.
If you experience memory issues (buildbot-workers going out-of-memory), you can reduce this number.
'';
};
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domain = lib.mkOption {
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type = lib.types.str;
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description = "Buildbot domain";
example = "buildbot.numtide.com";
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};
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outputsPath = lib.mkOption {
type = lib.types.nullOr lib.types.path;
description = "Path where we store the latest build store paths names for nix attributes as text files. This path will be exposed via nginx at \${domain}/nix-outputs";
default = null;
example = "/var/www/buildbot/nix-outputs";
};
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};
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};
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config = lib.mkIf cfg.enable {
# By default buildbot uses a normal user, which is not a good default, because
# we grant normal users potentially access to other resources. Also
# we don't to be able to ssh into buildbot.
users.users.buildbot = {
isNormalUser = lib.mkForce false;
isSystemUser = true;
};
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services.buildbot-master = {
enable = true;
# disable example workers from nixpkgs
builders = [ ];
schedulers = [ ];
workers = [ ];
home = "/var/lib/buildbot";
extraImports = ''
from datetime import timedelta
from buildbot_nix import GerritNixConfigurator
'';
configurators = [
''
util.JanitorConfigurator(logHorizon=timedelta(weeks=4), hour=12, dayOfWeek=6)
''
''
GerritNixConfigurator(
"gerrit.lix.systems",
"buildbot",
2022,
"/var/lib/buildbot/master/id_gerrit",
url=${builtins.toJSON config.services.buildbot-master.buildbotUrl},
nix_eval_max_memory_size=${builtins.toJSON cfg.evalMaxMemorySize},
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nix_eval_worker_count=${if cfg.evalWorkerCount == null then "None" else builtins.toString cfg.evalWorkerCount},
nix_supported_systems=${builtins.toJSON cfg.buildSystems},
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outputs_path=${if cfg.outputsPath == null then "None" else builtins.toJSON cfg.outputsPath},
)
''
];
buildbotUrl =
let
host = config.services.nginx.virtualHosts.${cfg.domain};
hasSSL = host.forceSSL || host.addSSL;
in
"${if hasSSL then "https" else "http"}://${cfg.domain}/";
dbUrl = cfg.dbUrl;
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pythonPackages = ps: [
ps.requests
ps.treq
ps.psycopg2
(ps.toPythonModule pkgs.buildbot-worker)
pkgs.buildbot-plugins.www-react
(pkgs.python3.pkgs.callPackage ../default.nix { })
];
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};
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systemd.services.buildbot-master = {
after = [ "postgresql.service" ];
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serviceConfig = {
# in master.py we read secrets from $CREDENTIALS_DIRECTORY
LoadCredential = [
"buildbot-nix-workers:${cfg.workersFile}"
"buildbot-oauth2-secret:${cfg.oauth2SecretFile}"
];
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};
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};
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services.postgresql = {
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enable = true;
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ensureDatabases = [ "buildbot" ];
ensureUsers = [{
name = "buildbot";
ensureDBOwnership = true;
}];
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};
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services.nginx.enable = true;
services.nginx.virtualHosts.${cfg.domain} =
let
port = config.services.buildbot-master.port;
in
{
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locations = {
"/".proxyPass = "http://127.0.0.1:${builtins.toString port}/";
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"/sse" = {
proxyPass = "http://127.0.0.1:${builtins.toString port}/sse";
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# proxy buffering will prevent sse to work
extraConfig = "proxy_buffering off;";
};
"/ws" = {
proxyPass = "http://127.0.0.1:${builtins.toString port}/ws";
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proxyWebsockets = true;
# raise the proxy timeout for the websocket
extraConfig = "proxy_read_timeout 6000s;";
};
} // lib.optionalAttrs (cfg.outputsPath != null) {
"/nix-outputs".root = cfg.outputsPath;
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};
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};
systemd.tmpfiles.rules = lib.optional (cfg.outputsPath != null)
# Allow buildbot-coordinator to write to this directory
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"d ${cfg.outputsPath} 0755 buildbot buildbot - -";
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};
}