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105369a46b
* gnu/services/databases.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi ("Database Services"): New subsubsection.
121 lines
4.6 KiB
Scheme
121 lines
4.6 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 David Thompson <davet@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services databases)
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#:use-module (gnu services)
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#:use-module (gnu system shadow)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages databases)
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#:use-module (guix records)
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#:use-module (guix monads)
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#:use-module (guix store)
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#:use-module (guix gexp)
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#:export (postgresql-service))
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;;; Commentary:
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;;;
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;;; Database services.
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;;;
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;;; Code:
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(define %default-postgres-hba
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(text-file "pg_hba.conf"
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"
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local all all trust
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host all all 127.0.0.1/32 trust
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host all all ::1/128 trust"))
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(define %default-postgres-ident
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(text-file "pg_ident.conf"
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"# MAPNAME SYSTEM-USERNAME PG-USERNAME"))
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(define %default-postgres-config
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(mlet %store-monad ((hba %default-postgres-hba)
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(ident %default-postgres-ident))
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(text-file* "postgresql.conf"
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;; The daemon will not start without these.
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"hba_file = '" hba "'\n"
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"ident_file = '" ident "'\n")))
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(define* (postgresql-service #:key (postgresql postgresql)
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(config-file %default-postgres-config)
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(data-directory "/var/lib/postgresql/data"))
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"Return a service that runs @var{postgresql}, the PostgreSQL database server.
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The PostgreSQL daemon loads its runtime configuration from @var{config-file}
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and stores the database cluster in @var{data-directory}."
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;; Wrapper script that switches to the 'postgres' user before launching
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;; daemon.
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(define start-script
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(mlet %store-monad ((config-file config-file))
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(gexp->script "start-postgres"
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#~(let ((user (getpwnam "postgres"))
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(postgres (string-append #$postgresql
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"/bin/postgres")))
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(setgid (passwd:gid user))
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(setuid (passwd:uid user))
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(system* postgres
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(string-append "--config-file=" #$config-file)
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"-D" #$data-directory)))))
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(define activate
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#~(begin
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(use-modules (guix build utils)
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(ice-9 match))
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(let ((user (getpwnam "postgres"))
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(initdb (string-append #$postgresql "/bin/initdb")))
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;; Create db state directory.
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(mkdir-p #$data-directory)
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(chown #$data-directory (passwd:uid user) (passwd:gid user))
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;; Drop privileges and init state directory in a new
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;; process. Wait for it to finish before proceeding.
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(match (primitive-fork)
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(0
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;; Exit with a non-zero status code if an exception is thrown.
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(dynamic-wind
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(const #t)
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(lambda ()
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(setgid (passwd:gid user))
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(setuid (passwd:uid user))
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(primitive-exit (system* initdb "-D" #$data-directory)))
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(lambda ()
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(primitive-exit 1))))
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(pid (waitpid pid))))))
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(mlet %store-monad ((start-script start-script))
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(return
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(service
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(provision '(postgres))
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(documentation "Run the PostgreSQL daemon.")
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(requirement '(user-processes loopback))
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(start #~(make-forkexec-constructor #$start-script))
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(stop #~(make-kill-destructor))
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(activate activate)
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(user-groups (list (user-group
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(name "postgres")
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(system? #t))))
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(user-accounts (list (user-account
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(name "postgres")
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(group "postgres")
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(system? #t)
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(comment "PostgreSQL server user")
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(home-directory "/var/empty")
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(shell
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#~(string-append #$shadow "/sbin/nologin")))))))))
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