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-rw-r--r--gnu/services/databases.scm121
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;;
+;;; 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 system shadow)
+ #:use-module (gnu packages admin)
+ #:use-module (gnu packages databases)
+ #:use-module (guix records)
+ #:use-module (guix monads)
+ #:use-module (guix store)
+ #:use-module (guix gexp)
+ #:export (postgresql-service))
+
+;;; Commentary:
+;;;
+;;; Database services.
+;;;
+;;; Code:
+
+(define %default-postgres-hba
+ (text-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
+ (text-file "pg_ident.conf"
+ "# MAPNAME SYSTEM-USERNAME PG-USERNAME"))
+
+(define %default-postgres-config
+ (mlet %store-monad ((hba %default-postgres-hba)
+ (ident %default-postgres-ident))
+ (text-file* "postgresql.conf"
+ ;; The daemon will not start without these.
+ "hba_file = '" hba "'\n"
+ "ident_file = '" ident "'\n")))
+
+(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}."
+ ;; Wrapper script that switches to the 'postgres' user before launching
+ ;; daemon.
+ (define start-script
+ (mlet %store-monad ((config-file config-file))
+ (gexp->script "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" #$data-directory)))))
+
+ (define activate
+ #~(begin
+ (use-modules (guix build utils)
+ (ice-9 match))
+
+ (let ((user (getpwnam "postgres"))
+ (initdb (string-append #$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" #$data-directory)))
+ (lambda ()
+ (primitive-exit 1))))
+ (pid (waitpid pid))))))
+
+ (mlet %store-monad ((start-script start-script))
+ (return
+ (service
+ (provision '(postgres))
+ (documentation "Run the PostgreSQL daemon.")
+ (requirement '(user-processes loopback))
+ (start #~(make-forkexec-constructor #$start-script))
+ (stop #~(make-kill-destructor))
+ (activate activate)
+ (user-groups (list (user-group
+ (name "postgres")
+ (system? #t))))
+ (user-accounts (list (user-account
+ (name "postgres")
+ (group "postgres")
+ (system? #t)
+ (comment "PostgreSQL server user")
+ (home-directory "/var/empty")
+ (shell
+ #~(string-append #$shadow "/sbin/nologin")))))))))