;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2015 David Thompson <davet@gnu.org> ;;; Copyright © 2015, 2016 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-configuration postgresql-configuration? postgresql-service postgresql-service-type mysql-service mysql-service-type mysql-configuration mysql-configuration?)) ;;; 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" "log_destination = 'syslog'\n" "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 (file-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" #$data-directory))))) (list (shepherd-service (provision '(postgres)) (documentation "Run the PostgreSQL daemon.") (requirement '(user-processes loopback syslogd)) (start #~(make-forkexec-constructor #$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)))) ;;; ;;; MySQL. ;;; (define-record-type* <mysql-configuration> mysql-configuration make-mysql-configuration mysql-configuration? (mysql mysql-configuration-mysql (default mariadb))) (define %mysql-accounts (list (user-group (name "mysql") (system? #t)) (user-account (name "mysql") (group "mysql") (system? #t) (home-directory "/var/empty") (shell (file-append shadow "/sbin/nologin"))))) (define mysql-configuration-file (match-lambda (($ <mysql-configuration> mysql) (plain-file "my.cnf" "[mysqld] datadir=/var/lib/mysql socket=/run/mysqld/mysqld.sock ")))) (define (%mysql-activation config) "Return an activation gexp for the MySQL or MariaDB database server." (let ((mysql (mysql-configuration-mysql config)) (my.cnf (mysql-configuration-file config))) #~(begin (use-modules (ice-9 popen) (guix build utils)) (let* ((mysqld (string-append #$mysql "/bin/mysqld")) (user (getpwnam "mysql")) (uid (passwd:uid user)) (gid (passwd:gid user)) (datadir "/var/lib/mysql") (rundir "/run/mysqld")) (mkdir-p datadir) (chown datadir uid gid) (mkdir-p rundir) (chown rundir uid gid) ;; Initialize the database when it doesn't exist. (when (not (file-exists? (string-append datadir "/mysql"))) (if (string-prefix? "mysql-" (strip-store-file-name #$mysql)) ;; For MySQL. (system* mysqld (string-append "--defaults-file=" #$my.cnf) "--initialize" "--user=mysql") ;; For MariaDB. ;; XXX: The 'mysql_install_db' script doesn't work directly ;; due to missing 'mkdir' in PATH. (let ((p (open-pipe* OPEN_WRITE mysqld (string-append "--defaults-file=" #$my.cnf) "--bootstrap" "--user=mysql"))) ;; Create the system database, as does by 'mysql_install_db'. (display "create database mysql;\n" p) (display "use mysql;\n" p) (for-each (lambda (sql) (call-with-input-file (string-append #$mysql "/share/mysql/" sql) (lambda (in) (dump-port in p)))) '("mysql_system_tables.sql" "mysql_performance_tables.sql" "mysql_system_tables_data.sql" "fill_help_tables.sql")) ;; Remove the anonymous user and disable root access from ;; remote machines, as does by 'mysql_secure_installation'. (display " DELETE FROM user WHERE User=''; DELETE FROM user WHERE User='root' AND Host NOT IN ('localhost', '127.0.0.1', '::1'); FLUSH PRIVILEGES; " p) (close-pipe p)))))))) (define (mysql-shepherd-service config) (list (shepherd-service (provision '(mysql)) (documentation "Run the MySQL server.") (start (let ((mysql (mysql-configuration-mysql config)) (my.cnf (mysql-configuration-file config))) #~(make-forkexec-constructor (list (string-append #$mysql "/bin/mysqld") (string-append "--defaults-file=" #$my.cnf)) #:user "mysql" #:group "mysql"))) (stop #~(make-kill-destructor))))) (define mysql-service-type (service-type (name 'mysql) (extensions (list (service-extension account-service-type (const %mysql-accounts)) (service-extension activation-service-type %mysql-activation) (service-extension shepherd-root-service-type mysql-shepherd-service))))) (define* (mysql-service #:key (config (mysql-configuration))) "Return a service that runs @command{mysqld}, the MySQL or MariaDB database server. The optional @var{config} argument specifies the configuration for @command{mysqld}, which should be a @code{<mysql-configuration>} object." (service mysql-service-type config))