;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2015 David Thompson <davet@gnu.org> ;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org> ;;; Copyright © 2016 Leo Famulari <leo@famulari.name> ;;; ;;; This file is part of GNU Guix. ;;; ;;; GNU Guix is free software; you can redistribute it and/or modify it ;;; under the terms of the GNU General Public License as published by ;;; the Free Software Foundation; either version 3 of the License, or (at ;;; your option) any later version. ;;; ;;; GNU Guix is distributed in the hope that it will be useful, but ;;; WITHOUT ANY WARRANTY; without even the implied warranty of ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;;; GNU General Public License for more details. ;;; ;;; You should have received a copy of the GNU General Public License ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. (define-module (gnu services databases) #:use-module (gnu services) #:use-module (gnu services shepherd) #:use-module (gnu system shadow) #:use-module (gnu packages admin) #:use-module (gnu packages databases) #:use-module (guix records) #:use-module (guix gexp) #:use-module (ice-9 match) #:export (postgresql-service)) ;;; Commentary: ;;; ;;; Database services. ;;; ;;; Code: (define-record-type* <postgresql-configuration> postgresql-configuration make-postgresql-configuration postgresql-configuration? (postgresql postgresql-configuration-postgresql ;<package> (default postgresql)) (config-file postgresql-configuration-file) (data-directory postgresql-configuration-data-directory)) (define %default-postgres-hba (plain-file "pg_hba.conf" " local all all trust host all all 127.0.0.1/32 trust host all all ::1/128 trust")) (define %default-postgres-ident (plain-file "pg_ident.conf" "# MAPNAME SYSTEM-USERNAME PG-USERNAME")) (define %default-postgres-config (mixed-text-file "postgresql.conf" "hba_file = '" %default-postgres-hba "'\n" "ident_file = '" %default-postgres-ident "'\n")) (define %postgresql-accounts (list (user-group (name "postgres") (system? #t)) (user-account (name "postgres") (group "postgres") (system? #t) (comment "PostgreSQL server user") (home-directory "/var/empty") (shell #~(string-append #$shadow "/sbin/nologin"))))) (define postgresql-activation (match-lambda (($ <postgresql-configuration> postgresql config-file data-directory) #~(begin (use-modules (guix build utils) (ice-9 match)) (let ((user (getpwnam "postgres")) (initdb (string-append #$postgresql "/bin/initdb"))) ;; Create db state directory. (mkdir-p #$data-directory) (chown #$data-directory (passwd:uid user) (passwd:gid user)) ;; Drop privileges and init state directory in a new ;; process. Wait for it to finish before proceeding. (match (primitive-fork) (0 ;; Exit with a non-zero status code if an exception is thrown. (dynamic-wind (const #t) (lambda () (setgid (passwd:gid user)) (setuid (passwd:uid user)) (primitive-exit (system* initdb "-D" #$data-directory))) (lambda () (primitive-exit 1)))) (pid (waitpid pid)))))))) (define postgresql-shepherd-service (match-lambda (($ <postgresql-configuration> postgresql config-file data-directory) (let ((start-script ;; Wrapper script that switches to the 'postgres' user before ;; launching daemon. (program-file "start-postgres" #~(let ((user (getpwnam "postgres")) (postgres (string-append #$postgresql "/bin/postgres"))) (setgid (passwd:gid user)) (setuid (passwd:uid user)) (system* postgres (string-append "--config-file=" #$config-file) "-D" #$data-directory))))) (list (shepherd-service (provision '(postgres)) (documentation "Run the PostgreSQL daemon.") (requirement '(user-processes loopback)) (start #~(make-forkexec-constructor #$start-script)) (stop #~(make-kill-destructor)))))))) (define postgresql-service-type (service-type (name 'postgresql) (extensions (list (service-extension shepherd-root-service-type postgresql-shepherd-service) (service-extension activation-service-type postgresql-activation) (service-extension account-service-type (const %postgresql-accounts)))))) (define* (postgresql-service #:key (postgresql postgresql) (config-file %default-postgres-config) (data-directory "/var/lib/postgresql/data")) "Return a service that runs @var{postgresql}, the PostgreSQL database server. The PostgreSQL daemon loads its runtime configuration from @var{config-file} and stores the database cluster in @var{data-directory}." (service postgresql-service-type (postgresql-configuration (postgresql postgresql) (config-file config-file) (data-directory data-directory))))