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;;; 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-service
mysql-service
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 #~(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" #$data-directory)))))
(list (shepherd-service
(provision '(postgres))
(documentation "Run the PostgreSQL daemon.")
(requirement '(user-processes loopback syslogd))
(start #~(make-forkexec-constructor #$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 #~(string-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))