615 lines
23 KiB
Nix
615 lines
23 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.postgresql;
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postgresql =
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let
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# ensure that
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# services.postgresql = {
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# enableJIT = true;
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# package = pkgs.postgresql_<major>;
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# };
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# works.
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base = if cfg.enableJIT then cfg.package.withJIT else cfg.package;
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in
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if cfg.extraPlugins == []
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then base
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else base.withPackages cfg.extraPlugins;
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toStr = value:
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if true == value then "yes"
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else if false == value then "no"
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else if isString value then "'${lib.replaceStrings ["'"] ["''"] value}'"
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else toString value;
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# The main PostgreSQL configuration file.
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configFile = pkgs.writeTextDir "postgresql.conf" (concatStringsSep "\n" (mapAttrsToList (n: v: "${n} = ${toStr v}") (filterAttrs (const (x: x != null)) cfg.settings)));
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configFileCheck = pkgs.runCommand "postgresql-configfile-check" {} ''
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${cfg.package}/bin/postgres -D${configFile} -C config_file >/dev/null
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touch $out
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'';
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groupAccessAvailable = versionAtLeast postgresql.version "11.0";
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in
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{
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imports = [
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(mkRemovedOptionModule [ "services" "postgresql" "extraConfig" ] "Use services.postgresql.settings instead.")
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(mkRenamedOptionModule [ "services" "postgresql" "logLinePrefix" ] [ "services" "postgresql" "settings" "log_line_prefix" ])
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(mkRenamedOptionModule [ "services" "postgresql" "port" ] [ "services" "postgresql" "settings" "port" ])
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];
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###### interface
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options = {
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services.postgresql = {
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enable = mkEnableOption "PostgreSQL Server";
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enableJIT = mkEnableOption "JIT support";
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package = mkPackageOption pkgs "postgresql" {
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example = "postgresql_15";
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};
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checkConfig = mkOption {
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type = types.bool;
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default = true;
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description = "Check the syntax of the configuration file at compile time";
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};
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dataDir = mkOption {
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type = types.path;
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defaultText = literalExpression ''"/var/lib/postgresql/''${config.services.postgresql.package.psqlSchema}"'';
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example = "/var/lib/postgresql/15";
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description = ''
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The data directory for PostgreSQL. If left as the default value
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this directory will automatically be created before the PostgreSQL server starts, otherwise
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the sysadmin is responsible for ensuring the directory exists with appropriate ownership
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and permissions.
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'';
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};
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authentication = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Defines how users authenticate themselves to the server. See the
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[PostgreSQL documentation for pg_hba.conf](https://www.postgresql.org/docs/current/auth-pg-hba-conf.html)
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for details on the expected format of this option. By default,
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peer based authentication will be used for users connecting
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via the Unix socket, and md5 password authentication will be
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used for users connecting via TCP. Any added rules will be
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inserted above the default rules. If you'd like to replace the
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default rules entirely, you can use `lib.mkForce` in your
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module.
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'';
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};
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identMap = mkOption {
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type = types.lines;
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default = "";
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example = ''
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map-name-0 system-username-0 database-username-0
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map-name-1 system-username-1 database-username-1
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'';
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description = ''
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Defines the mapping from system users to database users.
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See the [auth doc](https://postgresql.org/docs/current/auth-username-maps.html).
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'';
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};
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initdbArgs = mkOption {
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type = with types; listOf str;
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default = [];
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example = [ "--data-checksums" "--allow-group-access" ];
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description = ''
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Additional arguments passed to `initdb` during data dir
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initialisation.
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'';
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};
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initialScript = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = literalExpression ''
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pkgs.writeText "init-sql-script" '''
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alter user postgres with password 'myPassword';
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''';'';
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description = ''
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A file containing SQL statements to execute on first startup.
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'';
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};
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ensureDatabases = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Ensures that the specified databases exist.
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This option will never delete existing databases, especially not when the value of this
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option is changed. This means that databases created once through this option or
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otherwise have to be removed manually.
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'';
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example = [
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"gitea"
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"nextcloud"
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];
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};
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ensureUsers = mkOption {
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type = types.listOf (types.submodule {
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options = {
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name = mkOption {
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type = types.str;
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description = ''
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Name of the user to ensure.
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'';
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};
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ensureDBOwnership = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Grants the user ownership to a database with the same name.
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This database must be defined manually in
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[](#opt-services.postgresql.ensureDatabases).
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'';
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};
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ensureClauses = mkOption {
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description = ''
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An attrset of clauses to grant to the user. Under the hood this uses the
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[ALTER USER syntax](https://www.postgresql.org/docs/current/sql-alteruser.html) for each attrName where
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the attrValue is true in the attrSet:
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`ALTER USER user.name WITH attrName`
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'';
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example = literalExpression ''
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{
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superuser = true;
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createrole = true;
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createdb = true;
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}
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'';
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default = {};
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defaultText = lib.literalMD ''
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The default, `null`, means that the user created will have the default permissions assigned by PostgreSQL. Subsequent server starts will not set or unset the clause, so imperative changes are preserved.
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'';
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type = types.submodule {
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options = let
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defaultText = lib.literalMD ''
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`null`: do not set. For newly created roles, use PostgreSQL's default. For existing roles, do not touch this clause.
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'';
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in {
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superuser = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user, created by the ensureUser attr, superuser permissions. From the postgres docs:
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A database superuser bypasses all permission checks,
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except the right to log in. This is a dangerous privilege
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and should not be used carelessly; it is best to do most
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of your work as a role that is not a superuser. To create
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a new database superuser, use CREATE ROLE name SUPERUSER.
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You must do this as a role that is already a superuser.
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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createrole = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user, created by the ensureUser attr, createrole permissions. From the postgres docs:
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A role must be explicitly given permission to create more
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roles (except for superusers, since those bypass all
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permission checks). To create such a role, use CREATE
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ROLE name CREATEROLE. A role with CREATEROLE privilege
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can alter and drop other roles, too, as well as grant or
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revoke membership in them. However, to create, alter,
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drop, or change membership of a superuser role, superuser
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status is required; CREATEROLE is insufficient for that.
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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createdb = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user, created by the ensureUser attr, createdb permissions. From the postgres docs:
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A role must be explicitly given permission to create
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databases (except for superusers, since those bypass all
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permission checks). To create such a role, use CREATE
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ROLE name CREATEDB.
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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"inherit" = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user created inherit permissions. From the postgres docs:
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A role is given permission to inherit the privileges of
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roles it is a member of, by default. However, to create a
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role without the permission, use CREATE ROLE name
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NOINHERIT.
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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login = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user, created by the ensureUser attr, login permissions. From the postgres docs:
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Only roles that have the LOGIN attribute can be used as
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the initial role name for a database connection. A role
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with the LOGIN attribute can be considered the same as a
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“database user”. To create a role with login privilege,
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use either:
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CREATE ROLE name LOGIN; CREATE USER name;
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(CREATE USER is equivalent to CREATE ROLE except that
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CREATE USER includes LOGIN by default, while CREATE ROLE
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does not.)
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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replication = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user, created by the ensureUser attr, replication permissions. From the postgres docs:
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A role must explicitly be given permission to initiate
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streaming replication (except for superusers, since those
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bypass all permission checks). A role used for streaming
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replication must have LOGIN permission as well. To create
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such a role, use CREATE ROLE name REPLICATION LOGIN.
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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bypassrls = mkOption {
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type = types.nullOr types.bool;
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description = ''
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Grants the user, created by the ensureUser attr, replication permissions. From the postgres docs:
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A role must be explicitly given permission to bypass
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every row-level security (RLS) policy (except for
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superusers, since those bypass all permission checks). To
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create such a role, use CREATE ROLE name BYPASSRLS as a
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superuser.
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More information on postgres roles can be found [here](https://www.postgresql.org/docs/current/role-attributes.html)
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'';
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default = null;
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inherit defaultText;
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};
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};
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};
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};
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};
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});
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default = [];
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description = ''
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Ensures that the specified users exist.
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The PostgreSQL users will be identified using peer authentication. This authenticates the Unix user with the
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same name only, and that without the need for a password.
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This option will never delete existing users or remove DB ownership of databases
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once granted with `ensureDBOwnership = true;`. This means that this must be
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cleaned up manually when changing after changing the config in here.
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'';
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example = literalExpression ''
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[
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{
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name = "nextcloud";
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}
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{
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name = "superuser";
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ensureDBOwnership = true;
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}
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]
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'';
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};
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enableTCPIP = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether PostgreSQL should listen on all network interfaces.
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If disabled, the database can only be accessed via its Unix
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domain socket or via TCP connections to localhost.
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'';
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};
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extraPlugins = mkOption {
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type = with types; coercedTo (listOf path) (path: _ignorePg: path) (functionTo (listOf path));
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default = _: [];
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example = literalExpression "ps: with ps; [ postgis pg_repack ]";
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description = ''
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List of PostgreSQL plugins.
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'';
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};
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settings = mkOption {
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type = with types; submodule {
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freeformType = attrsOf (oneOf [ bool float int str ]);
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options = {
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shared_preload_libraries = mkOption {
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type = nullOr (coercedTo (listOf str) (concatStringsSep ", ") str);
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default = null;
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example = literalExpression ''[ "auto_explain" "anon" ]'';
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description = ''
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List of libraries to be preloaded.
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'';
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};
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log_line_prefix = mkOption {
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type = types.str;
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default = "[%p] ";
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example = "%m [%p] ";
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description = ''
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A printf-style string that is output at the beginning of each log line.
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Upstream default is `'%m [%p] '`, i.e. it includes the timestamp. We do
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not include the timestamp, because journal has it anyway.
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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 = 5432;
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description = ''
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The port on which PostgreSQL listens.
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'';
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};
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};
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};
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default = {};
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description = ''
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PostgreSQL configuration. Refer to
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<https://www.postgresql.org/docs/current/config-setting.html#CONFIG-SETTING-CONFIGURATION-FILE>
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for an overview of `postgresql.conf`.
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::: {.note}
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String values will automatically be enclosed in single quotes. Single quotes will be
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escaped with two single quotes as described by the upstream documentation linked above.
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:::
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'';
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example = literalExpression ''
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{
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log_connections = true;
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log_statement = "all";
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logging_collector = true;
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log_disconnections = true;
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log_destination = lib.mkForce "syslog";
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}
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'';
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};
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recoveryConfig = mkOption {
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type = types.nullOr types.lines;
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default = null;
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description = ''
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Contents of the {file}`recovery.conf` file.
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'';
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};
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superUser = mkOption {
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type = types.str;
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default = "postgres";
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internal = true;
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readOnly = true;
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description = ''
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PostgreSQL superuser account to use for various operations. Internal since changing
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this value would lead to breakage while setting up databases.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions = map ({ name, ensureDBOwnership, ... }: {
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assertion = ensureDBOwnership -> builtins.elem name cfg.ensureDatabases;
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message = ''
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For each database user defined with `services.postgresql.ensureUsers` and
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`ensureDBOwnership = true;`, a database with the same name must be defined
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in `services.postgresql.ensureDatabases`.
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Offender: ${name} has not been found among databases.
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'';
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}) cfg.ensureUsers;
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services.postgresql.settings =
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{
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hba_file = "${pkgs.writeText "pg_hba.conf" cfg.authentication}";
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ident_file = "${pkgs.writeText "pg_ident.conf" cfg.identMap}";
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log_destination = "stderr";
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listen_addresses = if cfg.enableTCPIP then "*" else "localhost";
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jit = mkDefault (if cfg.enableJIT then "on" else "off");
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};
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services.postgresql.package = let
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mkThrow = ver: throw "postgresql_${ver} was removed, please upgrade your postgresql version.";
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base = if versionAtLeast config.system.stateVersion "23.11" then pkgs.postgresql_15
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else if versionAtLeast config.system.stateVersion "22.05" then pkgs.postgresql_14
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else if versionAtLeast config.system.stateVersion "21.11" then pkgs.postgresql_13
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else if versionAtLeast config.system.stateVersion "20.03" then mkThrow "11"
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else if versionAtLeast config.system.stateVersion "17.09" then mkThrow "9_6"
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else mkThrow "9_5";
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in
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# Note: when changing the default, make it conditional on
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# ‘system.stateVersion’ to maintain compatibility with existing
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# systems!
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mkDefault (if cfg.enableJIT then base.withJIT else base);
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services.postgresql.dataDir = mkDefault "/var/lib/postgresql/${cfg.package.psqlSchema}";
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services.postgresql.authentication = mkMerge [
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(mkBefore "# Generated file; do not edit!")
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(mkAfter
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''
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# default value of services.postgresql.authentication
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local all all peer
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host all all 127.0.0.1/32 md5
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host all all ::1/128 md5
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'')
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];
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users.users.postgres =
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{ name = "postgres";
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uid = config.ids.uids.postgres;
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group = "postgres";
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description = "PostgreSQL server user";
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home = "${cfg.dataDir}";
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useDefaultShell = true;
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};
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users.groups.postgres.gid = config.ids.gids.postgres;
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environment.systemPackages = [ postgresql ];
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environment.pathsToLink = [
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"/share/postgresql"
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];
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system.checks = lib.optional (cfg.checkConfig && pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) configFileCheck;
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systemd.services.postgresql =
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{ description = "PostgreSQL Server";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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environment.PGDATA = cfg.dataDir;
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path = [ postgresql ];
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preStart =
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''
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if ! test -e ${cfg.dataDir}/PG_VERSION; then
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# Cleanup the data directory.
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rm -f ${cfg.dataDir}/*.conf
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# Initialise the database.
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initdb -U ${cfg.superUser} ${concatStringsSep " " cfg.initdbArgs}
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# See postStart!
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touch "${cfg.dataDir}/.first_startup"
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fi
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ln -sfn "${configFile}/postgresql.conf" "${cfg.dataDir}/postgresql.conf"
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${optionalString (cfg.recoveryConfig != null) ''
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ln -sfn "${pkgs.writeText "recovery.conf" cfg.recoveryConfig}" \
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"${cfg.dataDir}/recovery.conf"
|
||
''}
|
||
'';
|
||
|
||
# Wait for PostgreSQL to be ready to accept connections.
|
||
postStart =
|
||
''
|
||
PSQL="psql --port=${toString cfg.settings.port}"
|
||
|
||
while ! $PSQL -d postgres -c "" 2> /dev/null; do
|
||
if ! kill -0 "$MAINPID"; then exit 1; fi
|
||
sleep 0.1
|
||
done
|
||
|
||
if test -e "${cfg.dataDir}/.first_startup"; then
|
||
${optionalString (cfg.initialScript != null) ''
|
||
$PSQL -f "${cfg.initialScript}" -d postgres
|
||
''}
|
||
rm -f "${cfg.dataDir}/.first_startup"
|
||
fi
|
||
'' + optionalString (cfg.ensureDatabases != []) ''
|
||
${concatMapStrings (database: ''
|
||
$PSQL -tAc "SELECT 1 FROM pg_database WHERE datname = '${database}'" | grep -q 1 || $PSQL -tAc 'CREATE DATABASE "${database}"'
|
||
'') cfg.ensureDatabases}
|
||
'' + ''
|
||
${
|
||
concatMapStrings
|
||
(user:
|
||
let
|
||
dbOwnershipStmt = optionalString
|
||
user.ensureDBOwnership
|
||
''$PSQL -tAc 'ALTER DATABASE "${user.name}" OWNER TO "${user.name}";' '';
|
||
|
||
filteredClauses = filterAttrs (name: value: value != null) user.ensureClauses;
|
||
|
||
clauseSqlStatements = attrValues (mapAttrs (n: v: if v then n else "no${n}") filteredClauses);
|
||
|
||
userClauses = ''$PSQL -tAc 'ALTER ROLE "${user.name}" ${concatStringsSep " " clauseSqlStatements}' '';
|
||
in ''
|
||
$PSQL -tAc "SELECT 1 FROM pg_roles WHERE rolname='${user.name}'" | grep -q 1 || $PSQL -tAc 'CREATE USER "${user.name}"'
|
||
${userClauses}
|
||
|
||
${dbOwnershipStmt}
|
||
''
|
||
)
|
||
cfg.ensureUsers
|
||
}
|
||
'';
|
||
|
||
serviceConfig = mkMerge [
|
||
{ ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
|
||
User = "postgres";
|
||
Group = "postgres";
|
||
RuntimeDirectory = "postgresql";
|
||
Type = if versionAtLeast cfg.package.version "9.6"
|
||
then "notify"
|
||
else "simple";
|
||
|
||
# Shut down Postgres using SIGINT ("Fast Shutdown mode"). See
|
||
# https://www.postgresql.org/docs/current/server-shutdown.html
|
||
KillSignal = "SIGINT";
|
||
KillMode = "mixed";
|
||
|
||
# Give Postgres a decent amount of time to clean up after
|
||
# receiving systemd's SIGINT.
|
||
TimeoutSec = 120;
|
||
|
||
ExecStart = "${postgresql}/bin/postgres";
|
||
}
|
||
(mkIf (cfg.dataDir == "/var/lib/postgresql/${cfg.package.psqlSchema}") {
|
||
StateDirectory = "postgresql postgresql/${cfg.package.psqlSchema}";
|
||
StateDirectoryMode = if groupAccessAvailable then "0750" else "0700";
|
||
})
|
||
];
|
||
|
||
unitConfig.RequiresMountsFor = "${cfg.dataDir}";
|
||
};
|
||
|
||
};
|
||
|
||
meta.doc = ./postgresql.md;
|
||
meta.maintainers = with lib.maintainers; [ thoughtpolice danbst ];
|
||
}
|