aboutsummaryrefslogtreecommitdiff
path: root/gnu/services/databases.scm
blob: 932baba1bc82ec10cc5af6a7cec50d62fa9989a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
;;; 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>
;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
;;; Copyright © 2018 Clément Lassieur <clement@lassieur.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 services shepherd)
  #:use-module (gnu system shadow)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages databases)
  #:use-module (guix modules)
  #:use-module (guix records)
  #:use-module (guix gexp)
  #:use-module (srfi srfi-1)
  #:use-module (ice-9 match)
  #:export (<postgresql-config-file>
            postgresql-config-file
            postgresql-config-file?
            postgresql-config-file-log-destination
            postgresql-config-file-hba-file
            postgresql-config-file-ident-file
            postgresql-config-file-extra-config

            <postgresql-configuration>
            postgresql-configuration
            postgresql-configuration?
            postgresql-configuration-postgresql
            postgresql-configuration-port
            postgresql-configuration-locale
            postgresql-configuration-file
            postgresql-configuration-data-directory

            postgresql-service
            postgresql-service-type

            <elasticsearch-configuration>
            elasticsearch-configuration
            elasticsearch-configuration?
            elasticsearch-configuration-elasticsearch
            elasticsearch-configuration-data-path
            elasticsearch-configuration-logs-path
            elasticsearch-configuration-port
            elasticsearch-configuration-transport-port

            elasticsearch-service
            elasticsearch-service-type

            memcached-service-type
            <memcached-configuration>
            memcached-configuration
            memcached-configuration?
            memcached-configuration-memecached
            memcached-configuration-interfaces
            memcached-configuration-tcp-port
            memcached-configuration-udp-port
            memcached-configuration-additional-options

            <mongodb-configuration>
            mongodb-configuration
            mongodb-configuration?
            mongodb-configuration-mongodb
            mongodb-configuration-config-file
            mongodb-configuration-data-directory
            mongodb-service-type

            mysql-service
            mysql-service-type
            mysql-configuration
            mysql-configuration?

            redis-configuration
            redis-configuration?
            redis-service-type))

;;; Commentary:
;;;
;;; Database services.
;;;
;;; Code:

(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-record-type* <postgresql-config-file>
  postgresql-config-file make-postgresql-config-file
  postgresql-config-file?
  (log-destination postgresql-config-file-log-destination
                   (default "syslog"))
  (hba-file        postgresql-config-file-hba-file
                   (default %default-postgres-hba))
  (ident-file      postgresql-config-file-ident-file
                   (default %default-postgres-ident))
  (extra-config    postgresql-config-file-extra-config
                   (default '())))

(define-gexp-compiler (postgresql-config-file-compiler
                       (file <postgresql-config-file>) system target)
  (match file
    (($ <postgresql-config-file> log-destination hba-file
                                 ident-file extra-config)
     (define (quote' string)
       (if string
           (list "'" string "'")
           '()))

     (define contents
       (append-map
        (match-lambda
          ((key) '())
          ((key . #f) '())
          ((key values ...) `(,key " = " ,@values "\n")))

        `(("log_destination" ,@(quote' log-destination))
          ("hba_file" ,@(quote' hba-file))
          ("ident_file" ,@(quote' ident-file))
          ,@extra-config)))

     (gexp->derivation
      "postgresql.conf"
      #~(call-with-output-file (ungexp output "out")
          (lambda (port)
            (display
             (string-append #$@contents)
             port)))
      #:local-build? #t))))

(define-record-type* <postgresql-configuration>
  postgresql-configuration make-postgresql-configuration
  postgresql-configuration?
  (postgresql     postgresql-configuration-postgresql ;<package>
                  (default postgresql))
  (port           postgresql-configuration-port
                  (default 5432))
  (locale         postgresql-configuration-locale
                  (default "en_US.utf8"))
  (config-file    postgresql-configuration-file
                  (default (postgresql-config-file)))
  (data-directory postgresql-configuration-data-directory
                  (default "/var/lib/postgresql/data")))

(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 port locale config-file data-directory)
     #~(begin
         (use-modules (guix build utils)
                      (ice-9 match))

         (let ((user (getpwnam "postgres"))
               (initdb (string-append #$postgresql "/bin/initdb"))
               (initdb-args
                (append
                 (if #$locale
                     (list (string-append "--locale=" #$locale))
                     '()))))
           ;; Create db state directory.
           (mkdir-p #$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
                   (apply system*
                          initdb
                          "-D"
                          #$data-directory
                          initdb-args)))
                (lambda ()
                  (primitive-exit 1))))
             (pid (waitpid pid))))))))

(define postgresql-shepherd-service
  (match-lambda
    (($ <postgresql-configuration> postgresql port locale config-file data-directory)
     (let* ((pg_ctl-wrapper
             ;; Wrapper script that switches to the 'postgres' user before
             ;; launching daemon.
             (program-file
              "pg_ctl-wrapper"
              #~(begin
                  (use-modules (ice-9 match)
                               (ice-9 format))
                  (match (command-line)
                    ((_ mode)
                     (let ((user (getpwnam "postgres"))
                           (pg_ctl #$(file-append postgresql "/bin/pg_ctl"))
                           (options (format #f "--config-file=~a -p ~d"
                                            #$config-file #$port)))
                       (setgid (passwd:gid user))
                       (setuid (passwd:uid user))
                       (execl pg_ctl pg_ctl "-D" #$data-directory "-o" options
                              mode)))))))
            (action (lambda args
                      #~(lambda _
                          (invoke #$pg_ctl-wrapper #$@args)))))
       (list (shepherd-service
              (provision '(postgres))
              (documentation "Run the PostgreSQL daemon.")
              (requirement '(user-processes loopback syslogd))
              (start (action "start"))
              (stop (action "stop"))))))))

(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))))
                (default-value (postgresql-configuration))))

(define* (postgresql-service #:key (postgresql postgresql)
                             (port 5432)
                             (locale "en_US.utf8")
                             (config-file (postgresql-config-file))
                             (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)
            (port port)
            (locale locale)
            (config-file config-file)
            (data-directory data-directory))))


;;;
;;; Elasticsearch
;;;

(define-record-type* <elasticsearch-configuration>
  elasticsearch-configuration make-elasticsearch-configuration
  elasticsearch-configuration?
  (elasticsearch     elasticsearch-configuration-elasticsearch
                     (default elasticsearch))
  (data-path         elasticsearch-configuration-data-path
                     (default "/var/lib/"))
  (logs-path         elasticsearch-configuration-logs-path
                     (default "/var/log/elasticsearch"))
  (http-port         elasticsearch-configuration-port
                     (default 9200))
  (transport-port    elasticsearch-configuration-transport-port
                     (default 9300)))

(define (elasticsearch-configuration-directory
         data-path logs-path http-port transport-port)
  (computed-file
   "elasticsearch-config"
   #~(begin
       (mkdir #$output)
       (mkdir (string-append #$output "/scripts"))
       (call-with-output-file (string-append #$output "/elasticsearch.yml")
         (lambda (port)
           (display
            (string-append
             "path.data: " #$data-path "\n"
             "path.logs: " #$logs-path "\n"
             "http.port: " #$(number->string http-port) "\n"
             "transport.tcp.port: " #$(number->string transport-port) "\n")
            port))))))

(define %elasticsearch-accounts
  (list (user-group (name "elasticsearch") (system? #t))
        (user-account
         (name "elasticsearch")
         (group "elasticsearch")
         (system? #t)
         (comment "Elasticsearch server user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define elasticsearch-activation
  (match-lambda
    (($ <elasticsearch-configuration> elasticsearch data-path logs-path
                                      http-port transport-port)
     #~(begin
         (use-modules (guix build utils)
                      (ice-9 match))

         (let ((user (getpwnam "elasticsearch")))
           ;; Create db state directory.
           (for-each
            (lambda (path)
              (mkdir-p path)
              (chown path (passwd:uid user) (passwd:gid user)))
            '(#$data-path #$logs-path "/var/run/elasticsearch")))))))

(define elasticsearch-shepherd-service
  (match-lambda
    (($ <elasticsearch-configuration> elasticsearch data-path logs-path
                                      http-port transport-port)
     (list (shepherd-service
            (provision '(elasticsearch))
            (documentation "Run the Elasticsearch daemon.")
            (requirement '(user-processes syslogd))
            (start #~(make-forkexec-constructor
                      (list
                       (string-append #$elasticsearch "/bin/elasticsearch")
                       "-d"
                       "-p" "/var/run/elasticsearch/pid"
                       (string-append
                        "-Dpath.conf="
                        #$(elasticsearch-configuration-directory
                           data-path logs-path http-port transport-port)))
                      #:user "elasticsearch"
                      #:pid-file "/var/run/elasticsearch/pid"
                      #:log-file "/var/log/elasticsearch.log"))
            (stop #~(make-kill-destructor)))))))

(define elasticsearch-service-type
  (service-type (name 'elasticsearch)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          elasticsearch-shepherd-service)
                       (service-extension activation-service-type
                                          elasticsearch-activation)
                       (service-extension account-service-type
                                          (const %elasticsearch-accounts))))
                (default-value (elasticsearch-configuration))))


;;;
;;; Memcached
;;;

(define-record-type* <memcached-configuration>
  memcached-configuration make-memcached-configuration
  memcached-configuration?
  (memcached          memcached-configuration-memcached ;<package>
                      (default memcached))
  (interfaces         memcached-configuration-interfaces
                      (default '("0.0.0.0")))
  (tcp-port           memcached-configuration-tcp-port
                      (default 11211))
  (udp-port           memcached-configuration-udp-port
                      (default 11211))
  (additional-options memcached-configuration-additional-options
                      (default '())))

(define %memcached-accounts
  (list (user-group (name "memcached") (system? #t))
        (user-account
         (name "memcached")
         (group "memcached")
         (system? #t)
         (comment "Memcached server user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define memcached-activation
  #~(begin
      (use-modules (guix build utils))
      (let ((user (getpwnam "memcached")))
        (mkdir-p "/var/run/memcached")
        (chown "/var/run/memcached"
               (passwd:uid user) (passwd:gid user)))))

(define memcached-shepherd-service
  (match-lambda
    (($ <memcached-configuration> memcached interfaces tcp-port udp-port
                                  additional-options)
     (with-imported-modules (source-module-closure
                             '((gnu build shepherd)))
       (list (shepherd-service
              (provision '(memcached))
              (documentation "Run the Memcached daemon.")
              (requirement '(user-processes loopback))
              (modules '((gnu build shepherd)))
              (start #~(make-forkexec-constructor
                        `(#$(file-append memcached "/bin/memcached")
                          "-l" #$(string-join interfaces ",")
                          "-p" #$(number->string tcp-port)
                          "-U" #$(number->string udp-port)
                          "--daemon"
                          ;; Memcached changes to the memcached user prior to
                          ;; writing the pid file, so write it to a directory
                          ;; that memcached owns.
                          "-P" "/var/run/memcached/pid"
                          "-u" "memcached"
                          ,#$@additional-options)
                        #:log-file "/var/log/memcached"
                        #:pid-file "/var/run/memcached/pid"))
              (stop #~(make-kill-destructor))))))))

(define memcached-service-type
  (service-type (name 'memcached)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          memcached-shepherd-service)
                       (service-extension activation-service-type
                                          (const memcached-activation))
                       (service-extension account-service-type
                                          (const %memcached-accounts))))
                (default-value (memcached-configuration))))


;;;
;;; MongoDB
;;;

(define %default-mongodb-configuration-file
  (plain-file
   "mongodb.yaml"
   "# GNU Guix: MongoDB default configuration file
processManagement:
  pidFilePath: /var/run/mongodb/pid
storage:
  dbPath: /var/lib/mongodb
"))


(define-record-type* <mongodb-configuration>
  mongodb-configuration make-mongodb-configuration
  mongodb-configuration?
  (mongodb             mongodb-configuration-mongodb
                       (default mongodb))
  (config-file         mongodb-configuration-config-file
                       (default %default-mongodb-configuration-file))
  (data-directory      mongodb-configuration-data-directory
                       (default "/var/lib/mongodb")))

(define %mongodb-accounts
  (list (user-group (name "mongodb") (system? #t))
        (user-account
         (name "mongodb")
         (group "mongodb")
         (system? #t)
         (comment "Mongodb server user")
         (home-directory "/var/lib/mongodb")
         (shell (file-append shadow "/sbin/nologin")))))

(define mongodb-activation
  (match-lambda
    (($ <mongodb-configuration> mongodb config-file data-directory)
     #~(begin
         (use-modules (guix build utils))
         (let ((user (getpwnam "mongodb")))
           (for-each
            (lambda (directory)
              (mkdir-p directory)
              (chown directory
                     (passwd:uid user) (passwd:gid user)))
            '("/var/run/mongodb" #$data-directory)))))))

(define mongodb-shepherd-service
  (match-lambda
    (($ <mongodb-configuration> mongodb config-file data-directory)
     (shepherd-service
      (provision '(mongodb))
      (documentation "Run the Mongodb daemon.")
      (requirement '(user-processes loopback))
      (start #~(make-forkexec-constructor
                `(,(string-append #$mongodb "/bin/mongod")
                  "--config"
                  ,#$config-file)
                #:user "mongodb"
                #:group "mongodb"
                #:pid-file "/var/run/mongodb/pid"
                #:log-file "/var/log/mongodb.log"))
      (stop #~(make-kill-destructor))))))

(define mongodb-service-type
  (service-type
   (name 'mongodb)
   (description "Run the MongoDB document database server.")
   (extensions
    (list (service-extension shepherd-root-service-type
                             (compose list
                                      mongodb-shepherd-service))
          (service-extension activation-service-type
                             mongodb-activation)
          (service-extension account-service-type
                             (const %mongodb-accounts))))
   (default-value
     (mongodb-configuration))))


;;;
;;; MySQL.
;;;

(define-record-type* <mysql-configuration>
  mysql-configuration make-mysql-configuration
  mysql-configuration?
  (mysql mysql-configuration-mysql (default mariadb))
  (port mysql-configuration-port (default 3306)))

(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 port)
     (mixed-text-file "my.cnf" "[mysqld]
datadir=/var/lib/mysql
socket=/run/mysqld/mysqld.sock
port=" (number->string port) "
max_allowed_packet=16M
"))))

(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)))
   (default-value (mysql-configuration))))

(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))


;;;
;;; Redis
;;;

(define-record-type* <redis-configuration>
  redis-configuration make-redis-configuration
  redis-configuration?
  (redis             redis-configuration-redis ;<package>
                     (default redis))
  (bind              redis-configuration-bind
                     (default "127.0.0.1"))
  (port              redis-configuration-port
                     (default 6379))
  (working-directory redis-configuration-working-directory
                     (default "/var/lib/redis"))
  (config-file       redis-configuration-config-file
                     (default #f)))

(define (default-redis.conf bind port working-directory)
  (mixed-text-file "redis.conf"
                   "bind " bind "\n"
                   "port " (number->string port) "\n"
                   "dir " working-directory "\n"
                   "daemonize no\n"))

(define %redis-accounts
  (list (user-group (name "redis") (system? #t))
        (user-account
         (name "redis")
         (group "redis")
         (system? #t)
         (comment "Redis server user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define redis-activation
  (match-lambda
    (($ <redis-configuration> redis bind port working-directory config-file)
     #~(begin
         (use-modules (guix build utils)
                      (ice-9 match))

         (let ((user (getpwnam "redis")))
           (mkdir-p #$working-directory)
           (chown #$working-directory (passwd:uid user) (passwd:gid user)))))))

(define redis-shepherd-service
  (match-lambda
    (($ <redis-configuration> redis bind port working-directory config-file)
     (let ((config-file
            (or config-file
                (default-redis.conf bind port working-directory))))
       (list (shepherd-service
              (provision '(redis))
              (documentation "Run the Redis daemon.")
              (requirement '(user-processes syslogd))
              (start #~(make-forkexec-constructor
                        '(#$(file-append redis "/bin/redis-server")
                          #$config-file)
                        #:user "redis"
                        #:group "redis"))
              (stop #~(make-kill-destructor))))))))

(define redis-service-type
  (service-type (name 'redis)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          redis-shepherd-service)
                       (service-extension activation-service-type
                                          redis-activation)
                       (service-extension account-service-type
                                          (const %redis-accounts))))
                (default-value (redis-configuration))))