{ config, pkgs, ... }: with pkgs.lib; let cfg = config.services.postgresql; # see description of extraPlugins postgresqlAndPlugins = pg: if cfg.extraPlugins == [] then pg else pkgs.buildEnv { name = "postgresql-and-plugins-${(builtins.parseDrvName pg.name).version}"; paths = [ pg ] ++ cfg.extraPlugins; postBuild = '' mkdir -p $out/bin rm $out/bin/{pg_config,postgres,pg_ctl} cp --target-directory=$out/bin ${pg}/bin/{postgres,pg_config,pg_ctl} ''; }; postgresql = postgresqlAndPlugins cfg.package; flags = optional cfg.enableTCPIP "-i"; # The main PostgreSQL configuration file. configFile = pkgs.writeText "postgresql.conf" '' hba_file = '${pkgs.writeText "pg_hba.conf" cfg.authentication}' ident_file = '${pkgs.writeText "pg_ident.conf" cfg.identMap}' log_destination = 'syslog' ${cfg.extraConfig} ''; pre84 = versionOlder (builtins.parseDrvName postgresql.name).version "8.4"; in { ###### interface options = { services.postgresql = { enable = mkOption { default = false; description = '' Whether to run PostgreSQL. ''; }; package = mkOption { default = pkgs.postgresql; description = '' PostgreSQL package to use. ''; }; port = mkOption { default = "5432"; description = '' Port for PostgreSQL. ''; }; logDir = mkOption { default = "/var/log/postgresql"; description = '' Log directory for PostgreSQL. ''; }; dataDir = mkOption { default = "/var/db/postgresql"; description = '' Data directory for PostgreSQL. ''; }; authentication = mkOption { default = ""; description = '' Defines how users authenticate themselves to the server. ''; }; identMap = mkOption { default = ""; description = '' Defines the mapping from system users to database users. ''; }; authMethod = mkOption { default = " ident sameuser "; description = '' How to authorize users. Note: ident needs absolute trust to all allowed client hosts. ''; }; enableTCPIP = mkOption { default = false; description = '' Whether to run PostgreSQL with -i flag to enable TCP/IP connections. ''; }; extraPlugins = mkOption { default = []; example = "pkgs.postgis"; # of course don't use a string here! description = '' When this list contains elements a new store path is created. PostgreSQL and the elments are symlinked into it. Then pg_config, postgres and pc_ctl are copied to make them use the new $out/lib directory as pkglibdir. This makes it possible to use postgis without patching the .sql files which reference $libdir/postgis-1.5. ''; # Note: the duplication of executables is about 4MB size. # So a nicer solution was patching postgresql to allow setting the # libdir explicitely. }; extraConfig = mkOption { default = ""; description = "Additional text to be appended to postgresql.conf."; }; }; }; ###### implementation config = mkIf config.services.postgresql.enable { services.postgresql.authentication = '' # Generated file; do not edit! local all all ident ${optionalString pre84 "sameuser"} host all all 127.0.0.1/32 md5 host all all ::1/128 md5 ''; users.extraUsers = singleton { name = "postgres"; description = "PostgreSQL server user"; }; users.extraGroups = singleton { name = "postgres"; }; environment.systemPackages = [postgresql]; systemd.services.postgresql = { description = "PostgreSQL Server"; wantedBy = [ "multi-user.target" ]; after = [ "network.target" ]; environment = { TZ = config.time.timeZone; PGDATA = cfg.dataDir; }; path = [ pkgs.su postgresql ]; preStart = '' # Initialise the database. if ! test -e ${cfg.dataDir}; then mkdir -m 0700 -p ${cfg.dataDir} chown -R postgres ${cfg.dataDir} su -s ${pkgs.stdenv.shell} postgres -c 'initdb -U root' rm -f ${cfg.dataDir}/*.conf fi ln -sfn ${configFile} ${cfg.dataDir}/postgresql.conf ''; # */ serviceConfig = { ExecStart = "@${postgresql}/bin/postgres postgres ${toString flags}"; User = "postgres"; Group = "postgres"; PermissionsStartOnly = true; # Shut down Postgres using SIGINT ("Fast Shutdown mode"). See # http://www.postgresql.org/docs/current/static/server-shutdown.html KillSignal = "SIGINT"; # Give Postgres a decent amount of time to clean up after # receiving systemd's SIGINT. TimeoutSec = 60; }; # Wait for PostgreSQL to be ready to accept connections. postStart = '' while ! psql postgres -c "" 2> /dev/null; do if ! kill -0 "$MAINPID"; then exit 1; fi sleep 0.1 done ''; unitConfig.RequiresMountsFor = "${cfg.dataDir}"; }; }; }