403 lines
15 KiB
Nix
403 lines
15 KiB
Nix
srv:
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{ configIniOfService
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, srvsrht ? "${srv}srht" # Because "buildsrht" does not follow that pattern (missing an "s").
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, iniKey ? "${srv}.sr.ht"
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, webhooks ? false
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, extraTimers ? {}
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, mainService ? {}
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, extraServices ? {}
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, extraConfig ? {}
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, port
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}:
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{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (config.services) postgresql;
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redis = config.services.redis.servers."sourcehut-${srvsrht}";
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inherit (config.users) users;
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cfg = config.services.sourcehut;
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configIni = configIniOfService srv;
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srvCfg = cfg.${srv};
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baseService = serviceName: { allowStripe ? false }: extraService: let
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runDir = "/run/sourcehut/${serviceName}";
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rootDir = "/run/sourcehut/chroots/${serviceName}";
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in
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mkMerge [ extraService {
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after = [ "network.target" ] ++
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optional cfg.postgresql.enable "postgresql.service" ++
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optional cfg.redis.enable "redis-sourcehut-${srvsrht}.service";
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requires =
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optional cfg.postgresql.enable "postgresql.service" ++
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optional cfg.redis.enable "redis-sourcehut-${srvsrht}.service";
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path = [ pkgs.gawk ];
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environment.HOME = runDir;
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serviceConfig = {
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User = mkDefault srvCfg.user;
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Group = mkDefault srvCfg.group;
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RuntimeDirectory = [
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"sourcehut/${serviceName}"
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# Used by *srht-keys which reads ../config.ini
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"sourcehut/${serviceName}/subdir"
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"sourcehut/chroots/${serviceName}"
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];
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RuntimeDirectoryMode = "2750";
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# No need for the chroot path once inside the chroot
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InaccessiblePaths = [ "-+${rootDir}" ];
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# g+rx is for group members (eg. fcgiwrap or nginx)
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# to read Git/Mercurial repositories, buildlogs, etc.
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# o+x is for intermediate directories created by BindPaths= and like,
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# as they're owned by root:root.
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UMask = "0026";
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RootDirectory = rootDir;
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RootDirectoryStartOnly = true;
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PrivateTmp = true;
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MountAPIVFS = true;
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# config.ini is looked up in there, before /etc/srht/config.ini
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# Note that it fails to be set in ExecStartPre=
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WorkingDirectory = mkDefault ("-"+runDir);
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BindReadOnlyPaths = [
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builtins.storeDir
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"/etc"
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"/run/booted-system"
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"/run/current-system"
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"/run/systemd"
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] ++
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optional cfg.postgresql.enable "/run/postgresql" ++
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optional cfg.redis.enable "/run/redis-sourcehut-${srvsrht}";
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# LoadCredential= are unfortunately not available in ExecStartPre=
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# Hence this one is run as root (the +) with RootDirectoryStartOnly=
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# to reach credentials wherever they are.
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# Note that each systemd service gets its own ${runDir}/config.ini file.
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ExecStartPre = mkBefore [("+"+pkgs.writeShellScript "${serviceName}-credentials" ''
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set -x
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# Replace values beginning with a '<' by the content of the file whose name is after.
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gawk '{ if (match($0,/^([^=]+=)<(.+)/,m)) { getline f < m[2]; print m[1] f } else print $0 }' ${configIni} |
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${optionalString (!allowStripe) "gawk '!/^stripe-secret-key=/' |"}
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install -o ${srvCfg.user} -g root -m 400 /dev/stdin ${runDir}/config.ini
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'')];
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# The following options are only for optimizing:
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# systemd-analyze security
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AmbientCapabilities = "";
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CapabilityBoundingSet = "";
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# ProtectClock= adds DeviceAllow=char-rtc r
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DeviceAllow = "";
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateNetwork = mkDefault false;
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PrivateUsers = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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ProtectSystem = "strict";
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RemoveIPC = true;
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RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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#SocketBindAllow = [ "tcp:${toString srvCfg.port}" "tcp:${toString srvCfg.prometheusPort}" ];
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#SocketBindDeny = "any";
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SystemCallFilter = [
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"@system-service"
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"~@aio" "~@keyring" "~@memlock" "~@privileged" "~@timer"
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"@chown" "@setuid"
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];
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SystemCallArchitectures = "native";
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};
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} ];
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in
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{
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options.services.sourcehut.${srv} = {
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enable = mkEnableOption (lib.mdDoc "${srv} service");
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user = mkOption {
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type = types.str;
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default = srvsrht;
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description = lib.mdDoc ''
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User for ${srv}.sr.ht.
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'';
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};
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group = mkOption {
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type = types.str;
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default = srvsrht;
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description = lib.mdDoc ''
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Group for ${srv}.sr.ht.
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Membership grants access to the Git/Mercurial repositories by default,
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but not to the config.ini file (where secrets are).
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'';
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};
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port = mkOption {
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type = types.port;
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default = port;
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description = lib.mdDoc ''
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Port on which the "${srv}" backend should listen.
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'';
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};
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redis = {
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host = mkOption {
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type = types.str;
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default = "unix:///run/redis-sourcehut-${srvsrht}/redis.sock?db=0";
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example = "redis://shared.wireguard:6379/0";
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description = lib.mdDoc ''
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The redis host URL. This is used for caching and temporary storage, and must
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be shared between nodes (e.g. git1.sr.ht and git2.sr.ht), but need not be
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shared between services. It may be shared between services, however, with no
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ill effect, if this better suits your infrastructure.
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'';
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};
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};
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postgresql = {
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database = mkOption {
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type = types.str;
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default = "${srv}.sr.ht";
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description = lib.mdDoc ''
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PostgreSQL database name for the ${srv}.sr.ht service,
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used if [](#opt-services.sourcehut.postgresql.enable) is `true`.
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'';
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};
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};
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gunicorn = {
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extraArgs = mkOption {
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type = with types; listOf str;
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default = ["--timeout 120" "--workers 1" "--log-level=info"];
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description = lib.mdDoc "Extra arguments passed to Gunicorn.";
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};
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};
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} // optionalAttrs webhooks {
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webhooks = {
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extraArgs = mkOption {
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type = with types; listOf str;
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default = ["--loglevel DEBUG" "--pool eventlet" "--without-heartbeat"];
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description = lib.mdDoc "Extra arguments passed to the Celery responsible for webhooks.";
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};
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celeryConfig = mkOption {
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type = types.lines;
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default = "";
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description = lib.mdDoc "Content of the `celeryconfig.py` used by the Celery responsible for webhooks.";
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};
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};
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};
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config = lib.mkIf (cfg.enable && srvCfg.enable) (mkMerge [ extraConfig {
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users = {
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users = {
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"${srvCfg.user}" = {
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isSystemUser = true;
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group = mkDefault srvCfg.group;
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description = mkDefault "sourcehut user for ${srv}.sr.ht";
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};
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};
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groups = {
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"${srvCfg.group}" = { };
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} // optionalAttrs (cfg.postgresql.enable
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&& hasSuffix "0" (postgresql.settings.unix_socket_permissions or "")) {
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"postgres".members = [ srvCfg.user ];
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} // optionalAttrs (cfg.redis.enable
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&& hasSuffix "0" (redis.settings.unixsocketperm or "")) {
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"redis-sourcehut-${srvsrht}".members = [ srvCfg.user ];
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};
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};
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services.nginx = mkIf cfg.nginx.enable {
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virtualHosts."${srv}.${cfg.settings."sr.ht".global-domain}" = mkMerge [ {
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forceSSL = mkDefault true;
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locations."/".proxyPass = "http://${cfg.listenAddress}:${toString srvCfg.port}";
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locations."/static" = {
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root = "${pkgs.sourcehut.${srvsrht}}/${pkgs.sourcehut.python.sitePackages}/${srvsrht}";
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extraConfig = mkDefault ''
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expires 30d;
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'';
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};
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locations."/query" = mkIf (cfg.settings.${iniKey} ? api-origin) {
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proxyPass = cfg.settings.${iniKey}.api-origin;
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extraConfig = ''
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add_header 'Access-Control-Allow-Origin' '*';
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add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
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add_header 'Access-Control-Allow-Headers' 'User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
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if ($request_method = 'OPTIONS') {
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add_header 'Access-Control-Max-Age' 1728000;
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add_header 'Content-Type' 'text/plain; charset=utf-8';
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add_header 'Content-Length' 0;
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return 204;
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}
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add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
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'';
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};
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} cfg.nginx.virtualHost ];
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};
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services.postgresql = mkIf cfg.postgresql.enable {
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authentication = ''
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local ${srvCfg.postgresql.database} ${srvCfg.user} trust
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'';
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ensureDatabases = [ srvCfg.postgresql.database ];
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ensureUsers = map (name: {
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inherit name;
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ensurePermissions = { "DATABASE \"${srvCfg.postgresql.database}\"" = "ALL PRIVILEGES"; };
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}) [srvCfg.user];
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};
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services.sourcehut.settings = mkMerge [
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{
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"${srv}.sr.ht".origin = mkDefault "https://${srv}.${cfg.settings."sr.ht".global-domain}";
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}
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(mkIf cfg.postgresql.enable {
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"${srv}.sr.ht".connection-string = mkDefault "postgresql:///${srvCfg.postgresql.database}?user=${srvCfg.user}&host=/run/postgresql";
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})
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];
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services.redis.servers."sourcehut-${srvsrht}" = mkIf cfg.redis.enable {
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enable = true;
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databases = 3;
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syslog = true;
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# TODO: set a more informed value
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save = mkDefault [ [1800 10] [300 100] ];
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settings = {
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# TODO: set a more informed value
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maxmemory = "128MB";
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maxmemory-policy = "volatile-ttl";
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};
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};
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systemd.services = mkMerge [
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{
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"${srvsrht}" = baseService srvsrht { allowStripe = srv == "meta"; } (mkMerge [
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{
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description = "sourcehut ${srv}.sr.ht website service";
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before = optional cfg.nginx.enable "nginx.service";
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wants = optional cfg.nginx.enable "nginx.service";
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wantedBy = [ "multi-user.target" ];
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path = optional cfg.postgresql.enable postgresql.package;
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# Beware: change in credentials' content will not trigger restart.
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restartTriggers = [ configIni ];
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serviceConfig = {
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Type = "simple";
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Restart = mkDefault "always";
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#RestartSec = mkDefault "2min";
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StateDirectory = [ "sourcehut/${srvsrht}" ];
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StateDirectoryMode = "2750";
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ExecStart = "${cfg.python}/bin/gunicorn ${srvsrht}.app:app --name ${srvsrht} --bind ${cfg.listenAddress}:${toString srvCfg.port} " + concatStringsSep " " srvCfg.gunicorn.extraArgs;
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};
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preStart = let
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version = pkgs.sourcehut.${srvsrht}.version;
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stateDir = "/var/lib/sourcehut/${srvsrht}";
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in mkBefore ''
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set -x
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# Use the /run/sourcehut/${srvsrht}/config.ini
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# installed by a previous ExecStartPre= in baseService
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cd /run/sourcehut/${srvsrht}
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if test ! -e ${stateDir}/db; then
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# Setup the initial database.
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# Note that it stamps the alembic head afterward
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${cfg.python}/bin/${srvsrht}-initdb
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echo ${version} >${stateDir}/db
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fi
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${optionalString cfg.settings.${iniKey}.migrate-on-upgrade ''
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if [ "$(cat ${stateDir}/db)" != "${version}" ]; then
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# Manage schema migrations using alembic
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${cfg.python}/bin/${srvsrht}-migrate -a upgrade head
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echo ${version} >${stateDir}/db
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fi
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''}
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# Update copy of each users' profile to the latest
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# See https://lists.sr.ht/~sircmpwn/sr.ht-admins/<20190302181207.GA13778%40cirno.my.domain>
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if test ! -e ${stateDir}/webhook; then
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# Update ${iniKey}'s users' profile copy to the latest
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${cfg.python}/bin/srht-update-profiles ${iniKey}
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touch ${stateDir}/webhook
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fi
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'';
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} mainService ]);
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}
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(mkIf webhooks {
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"${srvsrht}-webhooks" = baseService "${srvsrht}-webhooks" {}
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{
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description = "sourcehut ${srv}.sr.ht webhooks service";
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after = [ "${srvsrht}.service" ];
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wantedBy = [ "${srvsrht}.service" ];
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partOf = [ "${srvsrht}.service" ];
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preStart = ''
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cp ${pkgs.writeText "${srvsrht}-webhooks-celeryconfig.py" srvCfg.webhooks.celeryConfig} \
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/run/sourcehut/${srvsrht}-webhooks/celeryconfig.py
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'';
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serviceConfig = {
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Type = "simple";
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Restart = "always";
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ExecStart = "${cfg.python}/bin/celery --app ${srvsrht}.webhooks worker --hostname ${srvsrht}-webhooks@%%h " + concatStringsSep " " srvCfg.webhooks.extraArgs;
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# Avoid crashing: os.getloadavg()
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ProcSubset = mkForce "all";
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};
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};
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})
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(mapAttrs (timerName: timer: (baseService timerName {} (mkMerge [
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{
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description = "sourcehut ${timerName} service";
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after = [ "network.target" "${srvsrht}.service" ];
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${cfg.python}/bin/${timerName}";
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};
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}
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(timer.service or {})
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]))) extraTimers)
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(mapAttrs (serviceName: extraService: baseService serviceName {} (mkMerge [
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{
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description = "sourcehut ${serviceName} service";
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# So that extraServices have the PostgreSQL database initialized.
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after = [ "${srvsrht}.service" ];
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wantedBy = [ "${srvsrht}.service" ];
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partOf = [ "${srvsrht}.service" ];
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serviceConfig = {
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Type = "simple";
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Restart = mkDefault "always";
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};
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}
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extraService
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])) extraServices)
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# Work around 'pq: permission denied for schema public' with postgres v15, until a
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# solution for `services.postgresql.ensureUsers` is found.
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# See https://github.com/NixOS/nixpkgs/issues/216989
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# Workaround taken from nixos/forgejo: https://github.com/NixOS/nixpkgs/pull/262741
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(lib.mkIf (
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cfg.postgresql.enable
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&& lib.strings.versionAtLeast config.services.postgresql.package.version "15.0"
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) {
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postgresql.postStart = (lib.mkAfter ''
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$PSQL -tAc 'ALTER DATABASE "${srvCfg.postgresql.database}" OWNER TO "${srvCfg.user}";'
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'');
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}
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)
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];
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systemd.timers = mapAttrs (timerName: timer:
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{
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description = "sourcehut timer for ${timerName}";
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wantedBy = [ "timers.target" ];
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inherit (timer) timerConfig;
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}) extraTimers;
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} ]);
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}
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