425 lines
14 KiB
Nix
425 lines
14 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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if cfg.extraPlugins == []
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then cfg.package
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else cfg.package.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} = ${toStr v}") cfg.settings));
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configFileCheck = pkgs.runCommand "postgresql-configfile-check" {} ''
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${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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];
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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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package = mkOption {
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type = types.package;
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example = literalExpression "pkgs.postgresql_11";
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description = ''
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PostgreSQL package to use.
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'';
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};
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port = mkOption {
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type = types.int;
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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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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/11";
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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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<link xlink:href="https://www.postgresql.org/docs/current/auth-pg-hba-conf.html">
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PostgreSQL documentation for pg_hba.conf</link>
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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 <function>lib.mkForce</function> 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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description = ''
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Defines the mapping from system users to database users.
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The general form is:
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map-name system-username database-username
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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 <literal>initdb</literal> 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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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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ensurePermissions = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = ''
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Permissions to ensure for the user, specified as an attribute set.
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The attribute names specify the database and tables to grant the permissions for.
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The attribute values specify the permissions to grant. You may specify one or
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multiple comma-separated SQL privileges here.
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For more information on how to specify the target
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and on which privileges exist, see the
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<link xlink:href="https://www.postgresql.org/docs/current/sql-grant.html">GRANT syntax</link>.
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The attributes are used as <code>GRANT ''${attrValue} ON ''${attrName}</code>.
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'';
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example = literalExpression ''
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{
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"DATABASE \"nextcloud\"" = "ALL PRIVILEGES";
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"ALL TABLES IN SCHEMA public" = "ALL PRIVILEGES";
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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 and have at least the ensured permissions.
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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 permissions, especially not when the value of this
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option is changed. This means that users created and permissions assigned once through this option or
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otherwise have to be removed manually.
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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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ensurePermissions = {
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"DATABASE nextcloud" = "ALL PRIVILEGES";
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};
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}
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{
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name = "superuser";
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ensurePermissions = {
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"ALL TABLES IN SCHEMA public" = "ALL PRIVILEGES";
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};
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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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logLinePrefix = 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 <literal>'%m [%p] '</literal>, 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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extraPlugins = mkOption {
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type = types.listOf types.path;
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default = [];
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example = literalExpression "with pkgs.postgresql_11.pkgs; [ postgis pg_repack ]";
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description = ''
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List of PostgreSQL plugins. PostgreSQL version for each plugin should
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match version for <literal>services.postgresql.package</literal> value.
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'';
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};
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settings = mkOption {
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type = with types; attrsOf (oneOf [ bool float int str ]);
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default = {};
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description = ''
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PostgreSQL configuration. Refer to
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<link xlink:href="https://www.postgresql.org/docs/11/config-setting.html#CONFIG-SETTING-CONFIGURATION-FILE"/>
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for an overview of <literal>postgresql.conf</literal>.
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<note><para>
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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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</para></note>
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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 <filename>recovery.conf</filename> 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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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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log_line_prefix = cfg.logLinePrefix;
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listen_addresses = if cfg.enableTCPIP then "*" else "localhost";
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port = cfg.port;
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};
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services.postgresql.package = let
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mkThrow = ver: throw "postgresql_${ver} was removed, please upgrade your postgresql version.";
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in
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# Note: when changing the default, make it conditional on
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# ‘system.stateVersion’ to maintain compatibility with existing
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# systems!
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mkDefault (if versionAtLeast config.system.stateVersion "21.11" then pkgs.postgresql_13
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else if versionAtLeast config.system.stateVersion "20.03" then pkgs.postgresql_11
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else if versionAtLeast config.system.stateVersion "17.09" then mkThrow "9_6"
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else mkThrow "9_5");
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services.postgresql.dataDir = mkDefault "/var/lib/postgresql/${cfg.package.psqlSchema}";
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services.postgresql.authentication = mkAfter
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''
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# Generated file; do not edit!
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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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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.extraDependencies = 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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"${cfg.dataDir}/recovery.conf"
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''}
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'';
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# Wait for PostgreSQL to be ready to accept connections.
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postStart =
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''
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PSQL="psql --port=${toString cfg.port}"
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while ! $PSQL -d postgres -c "" 2> /dev/null; do
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if ! kill -0 "$MAINPID"; then exit 1; fi
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sleep 0.1
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done
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if test -e "${cfg.dataDir}/.first_startup"; then
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${optionalString (cfg.initialScript != null) ''
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$PSQL -f "${cfg.initialScript}" -d postgres
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''}
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rm -f "${cfg.dataDir}/.first_startup"
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fi
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'' + optionalString (cfg.ensureDatabases != []) ''
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${concatMapStrings (database: ''
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$PSQL -tAc "SELECT 1 FROM pg_database WHERE datname = '${database}'" | grep -q 1 || $PSQL -tAc 'CREATE DATABASE "${database}"'
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'') cfg.ensureDatabases}
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'' + ''
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${concatMapStrings (user: ''
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$PSQL -tAc "SELECT 1 FROM pg_roles WHERE rolname='${user.name}'" | grep -q 1 || $PSQL -tAc 'CREATE USER "${user.name}"'
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${concatStringsSep "\n" (mapAttrsToList (database: permission: ''
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$PSQL -tAc 'GRANT ${permission} ON ${database} TO "${user.name}"'
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'') user.ensurePermissions)}
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'') cfg.ensureUsers}
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'';
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serviceConfig = mkMerge [
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{ ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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User = "postgres";
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Group = "postgres";
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RuntimeDirectory = "postgresql";
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Type = if versionAtLeast cfg.package.version "9.6"
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then "notify"
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else "simple";
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# Shut down Postgres using SIGINT ("Fast Shutdown mode"). See
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# http://www.postgresql.org/docs/current/static/server-shutdown.html
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KillSignal = "SIGINT";
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KillMode = "mixed";
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# Give Postgres a decent amount of time to clean up after
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# receiving systemd's SIGINT.
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TimeoutSec = 120;
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ExecStart = "${postgresql}/bin/postgres";
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}
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(mkIf (cfg.dataDir == "/var/lib/postgresql/${cfg.package.psqlSchema}") {
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StateDirectory = "postgresql postgresql/${cfg.package.psqlSchema}";
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StateDirectoryMode = if groupAccessAvailable then "0750" else "0700";
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})
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];
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unitConfig.RequiresMountsFor = "${cfg.dataDir}";
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};
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};
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meta.doc = ./postgresql.xml;
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meta.maintainers = with lib.maintainers; [ thoughtpolice danbst ];
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}
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