aboutsummaryrefslogtreecommitdiff
path: root/gnu/services/base.scm
blob: 6ab7b110ec10e60ff0c3a8feb666c157b96b824f (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
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015, 2016 Alex Kost <alezost@gmail.com>
;;; Copyright © 2015, 2016 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015 Sou Bunnbu <iyzsong@gmail.com>
;;; Copyright © 2016, 2017 Leo Famulari <leo@famulari.name>
;;; Copyright © 2016 David Craven <david@craven.ch>
;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2019 John Soo <jsoo1@asu.edu>
;;;
;;; 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 base)
  #:use-module (guix store)
  #:use-module (guix deprecation)
  #:use-module (gnu services)
  #:use-module (gnu services admin)
  #:use-module (gnu services shepherd)
  #:use-module (gnu system pam)
  #:use-module (gnu system shadow)                ; 'user-account', etc.
  #:use-module (gnu system uuid)
  #:use-module (gnu system file-systems)          ; 'file-system', etc.
  #:use-module (gnu system mapped-devices)
  #:use-module ((gnu system linux-initrd)
                #:select (file-system-packages))
  #:use-module (gnu packages admin)
  #:use-module ((gnu packages linux)
                #:select (alsa-utils crda eudev e2fsprogs fuse gpm kbd lvm2 rng-tools))
  #:use-module (gnu packages bash)
  #:use-module ((gnu packages base)
                #:select (canonical-package coreutils glibc glibc-utf8-locales))
  #:use-module (gnu packages package-management)
  #:use-module ((gnu packages gnupg) #:select (guile-gcrypt))
  #:use-module (gnu packages linux)
  #:use-module (gnu packages terminals)
  #:use-module ((gnu build file-systems)
                #:select (mount-flags->bit-mask))
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (guix modules)
  #:use-module ((guix self) #:select (make-config.scm))
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (ice-9 match)
  #:use-module (ice-9 format)
  #:export (fstab-service-type
            root-file-system-service
            file-system-service-type
            swap-service
            user-processes-service-type
            host-name-service
            console-keymap-service
            %default-console-font
            console-font-service-type
            console-font-service
            virtual-terminal-service-type

            static-networking

            static-networking?
            static-networking-interface
            static-networking-ip
            static-networking-netmask
            static-networking-gateway
            static-networking-requirement

            static-networking-service
            static-networking-service-type

            udev-configuration
            udev-configuration?
            udev-configuration-rules
            udev-service-type
            udev-service
            udev-rule
            file->udev-rule

            login-configuration
            login-configuration?
            login-service-type
            login-service

            agetty-configuration
            agetty-configuration?
            agetty-service
            agetty-service-type

            mingetty-configuration
            mingetty-configuration?
            mingetty-service
            mingetty-service-type

            %nscd-default-caches
            %nscd-default-configuration

            nscd-configuration
            nscd-configuration?

            nscd-cache
            nscd-cache?

            nscd-service-type
            nscd-service

            syslog-configuration
            syslog-configuration?
            syslog-service
            syslog-service-type
            %default-syslog.conf

            %default-authorized-guix-keys
            guix-configuration
            guix-configuration?

            guix-configuration-guix
            guix-configuration-build-group
            guix-configuration-build-accounts
            guix-configuration-authorize-key?
            guix-configuration-authorized-keys
            guix-configuration-use-substitutes?
            guix-configuration-substitute-urls
            guix-configuration-extra-options
            guix-configuration-log-file

            guix-service
            guix-service-type
            guix-publish-configuration
            guix-publish-configuration?
            guix-publish-configuration-guix
            guix-publish-configuration-port
            guix-publish-configuration-host
            guix-publish-configuration-compression
            guix-publish-configuration-compression-level ;deprecated
            guix-publish-configuration-nar-path
            guix-publish-configuration-cache
            guix-publish-configuration-ttl
            guix-publish-service
            guix-publish-service-type

            gpm-configuration
            gpm-configuration?
            gpm-service-type
            gpm-service

            urandom-seed-service-type
            urandom-seed-service

            rngd-configuration
            rngd-configuration?
            rngd-service-type
            rngd-service

            kmscon-configuration
            kmscon-configuration?
            kmscon-service-type

            pam-limits-service-type
            pam-limits-service

            %base-services))

;;; Commentary:
;;;
;;; Base system services---i.e., services that 99% of the users will want to
;;; use.
;;;
;;; Code:



;;;
;;; User processes.
;;;

(define %do-not-kill-file
  ;; Name of the file listing PIDs of processes that must survive when halting
  ;; the system.  Typical example is user-space file systems.
  "/etc/shepherd/do-not-kill")

(define (user-processes-shepherd-service requirements)
  "Return the 'user-processes' Shepherd service with dependencies on
REQUIREMENTS (a list of service names).

This is a synchronization point used to make sure user processes and daemons
get started only after crucial initial services have been started---file
system mounts, etc.  This is similar to the 'sysvinit' target in systemd."
  (define grace-delay
    ;; Delay after sending SIGTERM and before sending SIGKILL.
    4)

  (list (shepherd-service
         (documentation "When stopped, terminate all user processes.")
         (provision '(user-processes))
         (requirement requirements)
         (start #~(const #t))
         (stop #~(lambda _
                   (define (kill-except omit signal)
                     ;; Kill all the processes with SIGNAL except those listed
                     ;; in OMIT and the current process.
                     (let ((omit (cons (getpid) omit)))
                       (for-each (lambda (pid)
                                   (unless (memv pid omit)
                                     (false-if-exception
                                      (kill pid signal))))
                                 (processes))))

                   (define omitted-pids
                     ;; List of PIDs that must not be killed.
                     (if (file-exists? #$%do-not-kill-file)
                         (map string->number
                              (call-with-input-file #$%do-not-kill-file
                                (compose string-tokenize
                                         (@ (ice-9 rdelim) read-string))))
                         '()))

                   (define (now)
                     (car (gettimeofday)))

                   (define (sleep* n)
                     ;; Really sleep N seconds.
                     ;; Work around <http://bugs.gnu.org/19581>.
                     (define start (now))
                     (let loop ((elapsed 0))
                       (when (> n elapsed)
                         (sleep (- n elapsed))
                         (loop (- (now) start)))))

                   (define lset= (@ (srfi srfi-1) lset=))

                   (display "sending all processes the TERM signal\n")

                   (if (null? omitted-pids)
                       (begin
                         ;; Easy: terminate all of them.
                         (kill -1 SIGTERM)
                         (sleep* #$grace-delay)
                         (kill -1 SIGKILL))
                       (begin
                         ;; Kill them all except OMITTED-PIDS.  XXX: We would
                         ;; like to (kill -1 SIGSTOP) to get a fixed list of
                         ;; processes, like 'killall5' does, but that seems
                         ;; unreliable.
                         (kill-except omitted-pids SIGTERM)
                         (sleep* #$grace-delay)
                         (kill-except omitted-pids SIGKILL)
                         (delete-file #$%do-not-kill-file)))

                   (let wait ()
                     ;; Reap children, if any, so that we don't end up with
                     ;; zombies and enter an infinite loop.
                     (let reap-children ()
                       (define result
                         (false-if-exception
                          (waitpid WAIT_ANY (if (null? omitted-pids)
                                                0
                                                WNOHANG))))

                       (when (and (pair? result)
                                  (not (zero? (car result))))
                         (reap-children)))

                     (let ((pids (processes)))
                       (unless (lset= = pids (cons 1 omitted-pids))
                         (format #t "waiting for process termination\
 (processes left: ~s)~%"
                                 pids)
                         (sleep* 2)
                         (wait))))

                   (display "all processes have been terminated\n")
                   #f))
         (respawn? #f))))

(define user-processes-service-type
  (service-type
   (name 'user-processes)
   (extensions (list (service-extension shepherd-root-service-type
                                        user-processes-shepherd-service)))
   (compose concatenate)
   (extend append)

   ;; The value is the list of Shepherd services 'user-processes' depends on.
   ;; Extensions can add new services to this list.
   (default-value '())

   (description "The @code{user-processes} service is responsible for
terminating all the processes so that the root file system can be re-mounted
read-only, just before rebooting/halting.  Processes still running after a few
seconds after @code{SIGTERM} has been sent are terminated with
@code{SIGKILL}.")))


;;;
;;; File systems.
;;;

(define (file-system->fstab-entry file-system)
  "Return a @file{/etc/fstab} entry for @var{file-system}."
  (string-append (match (file-system-device file-system)
                   ((? file-system-label? label)
                    (string-append "LABEL="
                                   (file-system-label->string label)))
                   ((? uuid? uuid)
                    (string-append "UUID=" (uuid->string uuid)))
                   ((? string? device)
                    device))
                 "\t"
                 (file-system-mount-point file-system) "\t"
                 (file-system-type file-system) "\t"
                 (or (file-system-options file-system) "defaults") "\t"

                 ;; XXX: Omit the 'fs_freq' and 'fs_passno' fields because we
                 ;; don't have anything sensible to put in there.
                 ))

(define (file-systems->fstab file-systems)
  "Return a @file{/etc} entry for an @file{fstab} describing
@var{file-systems}."
  `(("fstab" ,(plain-file "fstab"
                          (string-append
                           "\
# This file was generated from your Guix configuration.  Any changes
# will be lost upon reboot or reconfiguration.\n\n"
                           (string-join (map file-system->fstab-entry
                                             file-systems)
                                        "\n")
                           "\n")))))

(define fstab-service-type
  ;; The /etc/fstab service.
  (service-type (name 'fstab)
                (extensions
                 (list (service-extension etc-service-type
                                          file-systems->fstab)))
                (compose concatenate)
                (extend append)
                (description
                 "Populate the @file{/etc/fstab} based on the given file
system objects.")))

(define %root-file-system-shepherd-service
  (shepherd-service
   (documentation "Take care of the root file system.")
   (provision '(root-file-system))
   (start #~(const #t))
   (stop #~(lambda _
             ;; Return #f if successfully stopped.
             (sync)

             (call-with-blocked-asyncs
              (lambda ()
                (let ((null (%make-void-port "w")))
                  ;; Close 'shepherd.log'.
                  (display "closing log\n")
                  ((@ (shepherd comm) stop-logging))

                  ;; Redirect the default output ports..
                  (set-current-output-port null)
                  (set-current-error-port null)

                  ;; Close /dev/console.
                  (for-each close-fdes '(0 1 2))

                  ;; At this point, there are no open files left, so the
                  ;; root file system can be re-mounted read-only.
                  (mount #f "/" #f
                         (logior MS_REMOUNT MS_RDONLY)
                         #:update-mtab? #f)

                  #f)))))
   (respawn? #f)))

(define root-file-system-service-type
  (shepherd-service-type 'root-file-system
                         (const %root-file-system-shepherd-service)))

(define (root-file-system-service)
  "Return a service whose sole purpose is to re-mount read-only the root file
system upon shutdown (aka. cleanly \"umounting\" root.)

This service must be the root of the service dependency graph so that its
'stop' action is invoked when shepherd is the only process left."
  (service root-file-system-service-type #f))

(define (file-system->shepherd-service-name file-system)
  "Return the symbol that denotes the service mounting and unmounting
FILE-SYSTEM."
  (symbol-append 'file-system-
                 (string->symbol (file-system-mount-point file-system))))

(define (mapped-device->shepherd-service-name md)
  "Return the symbol that denotes the shepherd service of MD, a <mapped-device>."
  (symbol-append 'device-mapping-
                 (string->symbol (mapped-device-target md))))

(define dependency->shepherd-service-name
  (match-lambda
    ((? mapped-device? md)
     (mapped-device->shepherd-service-name md))
    ((? file-system? fs)
     (file-system->shepherd-service-name fs))))

(define (file-system-shepherd-service file-system)
  "Return the shepherd service for @var{file-system}, or @code{#f} if
@var{file-system} is not auto-mounted upon boot."
  (let ((target  (file-system-mount-point file-system))
        (create? (file-system-create-mount-point? file-system))
        (dependencies (file-system-dependencies file-system))
        (packages (file-system-packages (list file-system))))
    (and (file-system-mount? file-system)
         (with-imported-modules (source-module-closure
                                 '((gnu build file-systems)))
           (shepherd-service
            (provision (list (file-system->shepherd-service-name file-system)))
            (requirement `(root-file-system udev
                           ,@(map dependency->shepherd-service-name dependencies)))
            (documentation "Check, mount, and unmount the given file system.")
            (start #~(lambda args
                       #$(if create?
                             #~(mkdir-p #$target)
                             #t)

                       (let (($PATH (getenv "PATH")))
                         ;; Make sure fsck.ext2 & co. can be found.
                         (dynamic-wind
                           (lambda ()
                             ;; Don’t display the PATH settings.
                             (with-output-to-port (%make-void-port "w")
                               (lambda ()
                                 (set-path-environment-variable "PATH"
                                                                '("bin" "sbin")
                                                                '#$packages))))
                           (lambda ()
                             (mount-file-system
                              (spec->file-system
                               '#$(file-system->spec file-system))
                              #:root "/"))
                           (lambda ()
                             (setenv "PATH" $PATH)))
                         #t)))
            (stop #~(lambda args
                      ;; Normally there are no processes left at this point, so
                      ;; TARGET can be safely unmounted.

                      ;; Make sure PID 1 doesn't keep TARGET busy.
                      (chdir "/")

                      (umount #$target)
                      #f))

            ;; We need additional modules.
            (modules `(((gnu build file-systems)
                        #:select (mount-file-system))
                       (gnu system file-systems)
                       ,@%default-modules)))))))

(define (file-system-shepherd-services file-systems)
  "Return the list of Shepherd services for FILE-SYSTEMS."
  (let* ((file-systems (filter file-system-mount? file-systems)))
    (define sink
      (shepherd-service
       (provision '(file-systems))
       (requirement (cons* 'root-file-system 'user-file-systems
                           (map file-system->shepherd-service-name
                                file-systems)))
       (documentation "Target for all the initially-mounted file systems")
       (start #~(const #t))
       (stop #~(const #f))))

    (define known-mount-points
      (map file-system-mount-point file-systems))

    (define user-unmount
      (shepherd-service
       (documentation "Unmount manually-mounted file systems.")
       (provision '(user-file-systems))
       (start #~(const #t))
       (stop #~(lambda args
                 (define (known? mount-point)
                   (member mount-point
                           (cons* "/proc" "/sys" '#$known-mount-points)))

                 ;; Make sure we don't keep the user's mount points busy.
                 (chdir "/")

                 (for-each (lambda (mount-point)
                             (format #t "unmounting '~a'...~%" mount-point)
                             (catch 'system-error
                               (lambda ()
                                 (umount mount-point))
                               (lambda args
                                 (let ((errno (system-error-errno args)))
                                   (format #t "failed to unmount '~a': ~a~%"
                                           mount-point (strerror errno))))))
                           (filter (negate known?) (mount-points)))
                 #f))))

    (cons* sink user-unmount
           (map file-system-shepherd-service file-systems))))

(define (file-system-fstab-entries file-systems)
  "Return the subset of @var{file-systems} that should have an entry in
@file{/etc/fstab}."
  ;; /etc/fstab is about telling fsck(8), mount(8), and umount(8) about
  ;; relevant file systems they'll have to deal with.  That excludes "pseudo"
  ;; file systems.
  ;;
  ;; In particular, things like GIO (part of GLib) use it to determine the set
  ;; of mounts, which is then used by graphical file managers and desktop
  ;; environments to display "volume" icons.  Thus, we really need to exclude
  ;; those pseudo file systems from the list.
  (remove (lambda (file-system)
            (or (member (file-system-type file-system)
                        %pseudo-file-system-types)
                (memq 'bind-mount (file-system-flags file-system))))
          file-systems))

(define file-system-service-type
  (service-type (name 'file-systems)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          file-system-shepherd-services)
                       (service-extension fstab-service-type
                                          file-system-fstab-entries)

                       ;; Have 'user-processes' depend on 'file-systems'.
                       (service-extension user-processes-service-type
                                          (const '(file-systems)))))
                (compose concatenate)
                (extend append)
                (description
                 "Provide Shepherd services to mount and unmount the given
file systems, as well as corresponding @file{/etc/fstab} entries.")))



;;;
;;; Preserve entropy to seed /dev/urandom on boot.
;;;

(define %random-seed-file
  "/var/lib/random-seed")

(define (urandom-seed-shepherd-service _)
  "Return a shepherd service for the /dev/urandom seed."
  (list (shepherd-service
         (documentation "Preserve entropy across reboots for /dev/urandom.")
         (provision '(urandom-seed))

         ;; Depend on udev so that /dev/hwrng is available.
         (requirement '(file-systems udev))

         (start #~(lambda _
                    ;; On boot, write random seed into /dev/urandom.
                    (when (file-exists? #$%random-seed-file)
                      (call-with-input-file #$%random-seed-file
                        (lambda (seed)
                          (call-with-output-file "/dev/urandom"
                            (lambda (urandom)
                              (dump-port seed urandom))))))

                    ;; Try writing from /dev/hwrng into /dev/urandom.
                    ;; It seems that the file /dev/hwrng always exists, even
                    ;; when there is no hardware random number generator
                    ;; available. So, we handle a failed read or any other error
                    ;; reported by the operating system.
                    (let ((buf (catch 'system-error
                                 (lambda ()
                                   (call-with-input-file "/dev/hwrng"
                                     (lambda (hwrng)
                                       (get-bytevector-n hwrng 512))))
                                 ;; Silence is golden...
                                 (const #f))))
                      (when buf
                        (call-with-output-file "/dev/urandom"
                          (lambda (urandom)
                            (put-bytevector urandom buf)))))

                    ;; Immediately refresh the seed in case the system doesn't
                    ;; shut down cleanly.
                    (call-with-input-file "/dev/urandom"
                      (lambda (urandom)
                        (let ((previous-umask (umask #o077))
                              (buf (make-bytevector 512)))
                          (mkdir-p (dirname #$%random-seed-file))
                          (get-bytevector-n! urandom buf 0 512)
                          (call-with-output-file #$%random-seed-file
                            (lambda (seed)
                              (put-bytevector seed buf)))
                          (umask previous-umask))))
                    #t))
         (stop #~(lambda _
                   ;; During shutdown, write from /dev/urandom into random seed.
                   (let ((buf (make-bytevector 512)))
                     (call-with-input-file "/dev/urandom"
                       (lambda (urandom)
                         (let ((previous-umask (umask #o077)))
                           (get-bytevector-n! urandom buf 0 512)
                           (mkdir-p (dirname #$%random-seed-file))
                           (call-with-output-file #$%random-seed-file
                             (lambda (seed)
                               (put-bytevector seed buf)))
                           (umask previous-umask))
                         #t)))))
         (modules `((rnrs bytevectors)
                    (rnrs io ports)
                    ,@%default-modules)))))

(define urandom-seed-service-type
  (service-type (name 'urandom-seed)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          urandom-seed-shepherd-service)

                       ;; Have 'user-processes' depend on 'urandom-seed'.
                       ;; This ensures that user processes and daemons don't
                       ;; start until we have seeded the PRNG.
                       (service-extension user-processes-service-type
                                          (const '(urandom-seed)))))
                (default-value #f)
                (description
                 "Seed the @file{/dev/urandom} pseudo-random number
generator (RNG) with the value recorded when the system was last shut
down.")))

(define-deprecated (urandom-seed-service)
  urandom-seed-service-type
  (service urandom-seed-service-type))


;;;
;;; Add hardware random number generator to entropy pool.
;;;

(define-record-type* <rngd-configuration>
  rngd-configuration make-rngd-configuration
  rngd-configuration?
  (rng-tools rngd-configuration-rng-tools)        ;package
  (device    rngd-configuration-device))          ;string

(define rngd-service-type
  (shepherd-service-type
    'rngd
    (lambda (config)
      (define rng-tools (rngd-configuration-rng-tools config))
      (define device (rngd-configuration-device config))

      (define rngd-command
        (list (file-append rng-tools "/sbin/rngd")
              "-f" "-r" device))

      (shepherd-service
        (documentation "Add TRNG to entropy pool.")
        (requirement '(udev))
        (provision '(trng))
        (start #~(make-forkexec-constructor #$@rngd-command))
        (stop #~(make-kill-destructor))))))

(define* (rngd-service #:key
                       (rng-tools rng-tools)
                       (device "/dev/hwrng"))
  "Return a service that runs the @command{rngd} program from @var{rng-tools}
to add @var{device} to the kernel's entropy pool.  The service will fail if
@var{device} does not exist."
  (service rngd-service-type
           (rngd-configuration
            (rng-tools rng-tools)
            (device device))))


;;;
;;; Console & co.
;;;

(define host-name-service-type
  (shepherd-service-type
   'host-name
   (lambda (name)
     (shepherd-service
      (documentation "Initialize the machine's host name.")
      (provision '(host-name))
      (start #~(lambda _
                 (sethostname #$name)))
      (respawn? #f)))))

(define (host-name-service name)
  "Return a service that sets the host name to @var{name}."
  (service host-name-service-type name))

(define virtual-terminal-service-type
  ;; Ensure that virtual terminals run in UTF-8 mode.  This is the case by
  ;; default with recent Linux kernels, but this service allows us to ensure
  ;; this.  This service must start before any 'term-' service so that newly
  ;; created terminals inherit this property.  See
  ;; <https://bugs.gnu.org/30505> for a discussion.
  (shepherd-service-type
   'virtual-terminal
   (lambda (utf8?)
     (let ((knob "/sys/module/vt/parameters/default_utf8"))
       (shepherd-service
        (documentation "Set virtual terminals in UTF-8 module.")
        (provision '(virtual-terminal))
        (requirement '(root-file-system))
        (start #~(lambda _
                   ;; In containers /sys is read-only so don't insist on
                   ;; writing to this file.
                   (unless (= 1 (call-with-input-file #$knob read))
                     (call-with-output-file #$knob
                       (lambda (port)
                         (display 1 port))))
                   #t))
        (stop #~(const #f)))))
   #t))                                           ;default to UTF-8

(define console-keymap-service-type
  (shepherd-service-type
   'console-keymap
   (lambda (files)
     (shepherd-service
      (documentation (string-append "Load console keymap (loadkeys)."))
      (provision '(console-keymap))
      (start #~(lambda _
                 (zero? (system* #$(file-append kbd "/bin/loadkeys")
                                 #$@files))))
      (respawn? #f)))))

(define-deprecated (console-keymap-service #:rest files)
  #f
  "Return a service to load console keymaps from @var{files}."
  (service console-keymap-service-type files))

(define %default-console-font
  ;; Note: 'LatGrkCyr-8x16' has the advantage of providing three common
  ;; scripts as well as glyphs for em dash, quotation marks, and other Unicode
  ;; codepoints notably found in the UTF-8 manual.
  "LatGrkCyr-8x16")

(define (console-font-shepherd-services tty+font)
  "Return a list of Shepherd services for each pair in TTY+FONT."
  (map (match-lambda
         ((tty . font)
          (let ((device (string-append "/dev/" tty)))
            (shepherd-service
             (documentation "Load a Unicode console font.")
             (provision (list (symbol-append 'console-font-
                                             (string->symbol tty))))

             ;; Start after mingetty has been started on TTY, otherwise the settings
             ;; are ignored.
             (requirement (list (symbol-append 'term-
                                               (string->symbol tty))))

             (start #~(lambda _
                        ;; It could be that mingetty is not fully ready yet,
                        ;; which we check by calling 'ttyname'.
                        (let loop ((i 10))
                          (unless (or (zero? i)
                                      (call-with-input-file #$device
                                        (lambda (port)
                                          (false-if-exception (ttyname port)))))
                            (usleep 500)
                            (loop (- i 1))))

                        ;; Assume the VT is already in UTF-8 mode, thanks to
                        ;; the 'virtual-terminal' service.
                        ;;
                        ;; 'setfont' returns EX_OSERR (71) when an
                        ;; KDFONTOP ioctl fails, for example.  Like
                        ;; systemd's vconsole support, let's not treat
                        ;; this as an error.
                        (case (status:exit-val
                               (system* #$(file-append kbd "/bin/setfont")
                                        "-C" #$device #$font))
                          ((0 71) #t)
                          (else #f))))
             (stop #~(const #t))
             (respawn? #f)))))
       tty+font))

(define console-font-service-type
  (service-type (name 'console-fonts)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          console-font-shepherd-services)))
                (compose concatenate)
                (extend append)
                (description
                 "Install the given fonts on the specified ttys (fonts are per
virtual console on GNU/Linux).  The value of this service is a list of
tty/font pairs.  The font can be the name of a font provided by the @code{kbd}
package or any valid argument to @command{setfont}, as in this example:

@example
'((\"tty1\" . \"LatGrkCyr-8x16\")
  (\"tty2\" . (file-append
                font-tamzen
                \"/share/kbd/consolefonts/TamzenForPowerline10x20.psf\")))
@end example\n")))

(define* (console-font-service tty #:optional (font "LatGrkCyr-8x16"))
  "This procedure is deprecated in favor of @code{console-font-service-type}.

Return a service that sets up Unicode support in @var{tty} and loads
@var{font} for that tty (fonts are per virtual console in Linux.)"
  (simple-service (symbol-append 'console-font- (string->symbol tty))
                  console-font-service-type `((,tty . ,font))))

(define %default-motd
  (plain-file "motd" "This is the GNU operating system, welcome!\n\n"))

(define-record-type* <login-configuration>
  login-configuration make-login-configuration
  login-configuration?
  (motd                   login-configuration-motd     ;file-like
                          (default %default-motd))
  ;; Allow empty passwords by default so that first-time users can log in when
  ;; the 'root' account has just been created.
  (allow-empty-passwords? login-configuration-allow-empty-passwords?
                          (default #t)))               ;Boolean

(define (login-pam-service config)
  "Return the list of PAM service needed for CONF."
  ;; Let 'login' be known to PAM.
  (list (unix-pam-service "login"
                          #:login-uid? #t
                          #:allow-empty-passwords?
                          (login-configuration-allow-empty-passwords? config)
                          #:motd
                          (login-configuration-motd config))))

(define login-service-type
  (service-type (name 'login)
                (extensions (list (service-extension pam-root-service-type
                                                     login-pam-service)))
                (default-value (login-configuration))
                (description
                 "Provide a console log-in service as specified by its
configuration value, a @code{login-configuration} object.")))

(define* (login-service #:optional (config (login-configuration)))
  "Return a service configure login according to @var{config}, which specifies
the message of the day, among other things."
  (service login-service-type config))

(define-record-type* <agetty-configuration>
  agetty-configuration make-agetty-configuration
  agetty-configuration?
  (agetty           agetty-configuration-agetty   ;<package>
                    (default util-linux))
  (tty              agetty-configuration-tty)     ;string | #f
  (term             agetty-term                   ;string | #f
                    (default #f))
  (baud-rate        agetty-baud-rate              ;string | #f
                    (default #f))
  (auto-login       agetty-auto-login             ;list of strings | #f
                    (default #f))
  (login-program    agetty-login-program          ;gexp
                    (default (file-append shadow "/bin/login")))
  (login-pause?     agetty-login-pause?           ;Boolean
                    (default #f))
  (eight-bits?      agetty-eight-bits?            ;Boolean
                    (default #f))
  (no-reset?        agetty-no-reset?              ;Boolean
                    (default #f))
  (remote?          agetty-remote?                ;Boolean
                    (default #f))
  (flow-control?    agetty-flow-control?          ;Boolean
                    (default #f))
  (host             agetty-host                   ;string | #f
                    (default #f))
  (no-issue?        agetty-no-issue?              ;Boolean
                    (default #f))
  (init-string      agetty-init-string            ;string | #f
                    (default #f))
  (no-clear?        agetty-no-clear?              ;Boolean
                    (default #f))
  (local-line       agetty-local-line             ;always | never | auto
                    (default #f))
  (extract-baud?    agetty-extract-baud?          ;Boolean
                    (default #f))
  (skip-login?      agetty-skip-login?            ;Boolean
                    (default #f))
  (no-newline?      agetty-no-newline?            ;Boolean
                    (default #f))
  (login-options    agetty-login-options          ;string | #f
                    (default #f))
  (chroot           agetty-chroot                 ;string | #f
                    (default #f))
  (hangup?          agetty-hangup?                ;Boolean
                    (default #f))
  (keep-baud?       agetty-keep-baud?             ;Boolean
                    (default #f))
  (timeout          agetty-timeout                ;integer | #f
                    (default #f))
  (detect-case?     agetty-detect-case?           ;Boolean
                    (default #f))
  (wait-cr?         agetty-wait-cr?               ;Boolean
                    (default #f))
  (no-hints?        agetty-no-hints?              ;Boolean
                    (default #f))
  (no-hostname?     agetty-no hostname?           ;Boolean
                    (default #f))
  (long-hostname?   agetty-long-hostname?         ;Boolean
                    (default #f))
  (erase-characters agetty-erase-characters       ;string | #f
                    (default #f))
  (kill-characters  agetty-kill-characters        ;string | #f
                    (default #f))
  (chdir            agetty-chdir                  ;string | #f
                    (default #f))
  (delay            agetty-delay                  ;integer | #f
                    (default #f))
  (nice             agetty-nice                   ;integer | #f
                    (default #f))
  ;; "Escape hatch" for passing arbitrary command-line arguments.
  (extra-options    agetty-extra-options          ;list of strings
                    (default '()))
;;; XXX Unimplemented for now!
;;; (issue-file     agetty-issue-file             ;file-like
;;;                 (default #f))
  )

(define (default-serial-port)
  "Return a gexp that determines a reasonable default serial port
to use as the tty.  This is primarily useful for headless systems."
  #~(begin
      ;; console=device,options
      ;; device: can be tty0, ttyS0, lp0, ttyUSB0 (serial).
      ;; options: BBBBPNF. P n|o|e, N number of bits,
      ;; F flow control (r RTS)
      (let* ((not-comma (char-set-complement (char-set #\,)))
             (command (linux-command-line))
             (agetty-specs (find-long-options "agetty.tty" command))
             (console-specs (filter (lambda (spec)
                                     (and (string-prefix? "tty" spec)
                                          (not (or
                                                (string-prefix? "tty0" spec)
                                                (string-prefix? "tty1" spec)
                                                (string-prefix? "tty2" spec)
                                                (string-prefix? "tty3" spec)
                                                (string-prefix? "tty4" spec)
                                                (string-prefix? "tty5" spec)
                                                (string-prefix? "tty6" spec)
                                                (string-prefix? "tty7" spec)
                                                (string-prefix? "tty8" spec)
                                                (string-prefix? "tty9" spec)))))
                                    (find-long-options "console" command)))
             (specs (append agetty-specs console-specs)))
        (match specs
         (() #f)
         ((spec _ ...)
          ;; Extract device name from first spec.
          (match (string-tokenize spec not-comma)
           ((device-name _ ...)
            device-name)))))))

(define agetty-shepherd-service
  (match-lambda
    (($ <agetty-configuration> agetty tty term baud-rate auto-login
        login-program login-pause? eight-bits? no-reset? remote? flow-control?
        host no-issue? init-string no-clear? local-line extract-baud?
        skip-login? no-newline? login-options chroot hangup? keep-baud? timeout
        detect-case? wait-cr? no-hints? no-hostname? long-hostname?
        erase-characters kill-characters chdir delay nice extra-options)
     (list
       (shepherd-service
         (modules '((ice-9 match) (gnu build linux-boot)))
         (documentation "Run agetty on a tty.")
         (provision (list (symbol-append 'term- (string->symbol (or tty "auto")))))

         ;; Since the login prompt shows the host name, wait for the 'host-name'
         ;; service to be done.  Also wait for udev essentially so that the tty
         ;; text is not lost in the middle of kernel messages (see also
         ;; mingetty-shepherd-service).
         (requirement '(user-processes host-name udev))

         (start #~(lambda args
                    (let ((defaulted-tty #$(or tty (default-serial-port))))
                      (apply
                       (if defaulted-tty
                           (make-forkexec-constructor
                            (list #$(file-append util-linux "/sbin/agetty")
                                  #$@extra-options
                                  #$@(if eight-bits?
                                         #~("--8bits")
                                         #~())
                                  #$@(if no-reset?
                                         #~("--noreset")
                                         #~())
                                  #$@(if remote?
                                         #~("--remote")
                                         #~())
                                  #$@(if flow-control?
                                         #~("--flow-control")
                                         #~())
                                  #$@(if host
                                         #~("--host" #$host)
                                         #~())
                                  #$@(if no-issue?
                                         #~("--noissue")
                                         #~())
                                  #$@(if init-string
                                         #~("--init-string" #$init-string)
                                         #~())
                                  #$@(if no-clear?
                                         #~("--noclear")
                                         #~())
;;; FIXME This doesn't work as expected. According to agetty(8), if this option
;;; is not passed, then the default is 'auto'. However, in my tests, when that
;;; option is selected, agetty never presents the login prompt, and the
;;; term-ttyS0 service respawns every few seconds.
                                  #$@(if local-line
                                         #~(#$(match local-line
                                                     ('auto "--local-line=auto")
                                                     ('always "--local-line=always")
                                                     ('never "-local-line=never")))
                                         #~())
                                  #$@(if tty
                                         #~()
                                         #~("--keep-baud"))
                                  #$@(if extract-baud?
                                         #~("--extract-baud")
                                         #~())
                                  #$@(if skip-login?
                                         #~("--skip-login")
                                         #~())
                                  #$@(if no-newline?
                                         #~("--nonewline")
                                         #~())
                                  #$@(if login-options
                                         #~("--login-options" #$login-options)
                                         #~())
                                  #$@(if chroot
                                         #~("--chroot" #$chroot)
                                         #~())
                                  #$@(if hangup?
                                         #~("--hangup")
                                         #~())
                                  #$@(if keep-baud?
                                         #~("--keep-baud")
                                         #~())
                                  #$@(if timeout
                                         #~("--timeout" #$(number->string timeout))
                                         #~())
                                  #$@(if detect-case?
                                         #~("--detect-case")
                                         #~())
                                  #$@(if wait-cr?
                                         #~("--wait-cr")
                                         #~())
                                  #$@(if no-hints?
                                         #~("--nohints?")
                                         #~())
                                  #$@(if no-hostname?
                                         #~("--nohostname")
                                         #~())
                                  #$@(if long-hostname?
                                         #~("--long-hostname")
                                         #~())
                                  #$@(if erase-characters
                                         #~("--erase-chars" #$erase-characters)
                                         #~())
                                  #$@(if kill-characters
                                         #~("--kill-chars" #$kill-characters)
                                         #~())
                                  #$@(if chdir
                                         #~("--chdir" #$chdir)
                                         #~())
                                  #$@(if delay
                                         #~("--delay" #$(number->string delay))
                                         #~())
                                  #$@(if nice
                                         #~("--nice" #$(number->string nice))
                                         #~())
                                  #$@(if auto-login
                                         (list "--autologin" auto-login)
                                         '())
                                  #$@(if login-program
                                         #~("--login-program" #$login-program)
                                         #~())
                                  #$@(if login-pause?
                                         #~("--login-pause")
                                         #~())
                                  defaulted-tty
                                  #$@(if baud-rate
                                         #~(#$baud-rate)
                                         #~())
                                  #$@(if term
                                         #~(#$term)
                                         #~())))
                           (const #f)) ; never start.
                       args))))
         (stop #~(make-kill-destructor)))))))

(define agetty-service-type
  (service-type (name 'agetty)
                (extensions (list (service-extension shepherd-root-service-type
                                                     agetty-shepherd-service)))
                (description
                 "Provide console login using the @command{agetty}
program.")))

(define* (agetty-service config)
  "Return a service to run agetty according to @var{config}, which specifies
the tty to run, among other things."
  (service agetty-service-type config))

(define-record-type* <mingetty-configuration>
  mingetty-configuration make-mingetty-configuration
  mingetty-configuration?
  (mingetty       mingetty-configuration-mingetty ;<package>
                  (default mingetty))
  (tty            mingetty-configuration-tty)     ;string
  (auto-login     mingetty-auto-login             ;string | #f
                  (default #f))
  (login-program  mingetty-login-program          ;gexp
                  (default #f))
  (login-pause?   mingetty-login-pause?           ;Boolean
                  (default #f)))

(define mingetty-shepherd-service
  (match-lambda
    (($ <mingetty-configuration> mingetty tty auto-login login-program
                                 login-pause?)
     (list
      (shepherd-service
       (documentation "Run mingetty on an tty.")
       (provision (list (symbol-append 'term- (string->symbol tty))))

       ;; Since the login prompt shows the host name, wait for the 'host-name'
       ;; service to be done.  Also wait for udev essentially so that the tty
       ;; text is not lost in the middle of kernel messages (XXX).
       (requirement '(user-processes host-name udev virtual-terminal))

       (start  #~(make-forkexec-constructor
                  (list #$(file-append mingetty "/sbin/mingetty")
                        "--noclear"

                        ;; Avoiding 'vhangup' allows us to avoid 'setfont'
                        ;; errors down the path where various ioctls get
                        ;; EIO--see 'hung_up_tty_ioctl' in driver/tty/tty_io.c
                        ;; in Linux.
                        "--nohangup" #$tty

                        #$@(if auto-login
                               #~("--autologin" #$auto-login)
                               #~())
                        #$@(if login-program
                               #~("--loginprog" #$login-program)
                               #~())
                        #$@(if login-pause?
                               #~("--loginpause")
                               #~()))))
       (stop   #~(make-kill-destructor)))))))

(define mingetty-service-type
  (service-type (name 'mingetty)
                (extensions (list (service-extension shepherd-root-service-type
                                                     mingetty-shepherd-service)))
                (description
                 "Provide console login using the @command{mingetty}
program.")))

(define* (mingetty-service config)
  "Return a service to run mingetty according to @var{config}, which specifies
the tty to run, among other things."
  (service mingetty-service-type config))

(define-record-type* <nscd-configuration> nscd-configuration
  make-nscd-configuration
  nscd-configuration?
  (log-file    nscd-configuration-log-file        ;string
               (default "/var/log/nscd.log"))
  (debug-level nscd-debug-level                   ;integer
               (default 0))
  ;; TODO: See nscd.conf in glibc for other options to add.
  (caches     nscd-configuration-caches           ;list of <nscd-cache>
              (default %nscd-default-caches))
  (name-services nscd-configuration-name-services ;list of <packages>
                 (default '()))
  (glibc      nscd-configuration-glibc            ;<package>
              (default (canonical-package glibc))))

(define-record-type* <nscd-cache> nscd-cache make-nscd-cache
  nscd-cache?
  (database              nscd-cache-database)              ;symbol
  (positive-time-to-live nscd-cache-positive-time-to-live) ;integer
  (negative-time-to-live nscd-cache-negative-time-to-live
                         (default 20))             ;integer
  (suggested-size        nscd-cache-suggested-size ;integer ("default module
                                                   ;of hash table")
                         (default 211))
  (check-files?          nscd-cache-check-files?  ;Boolean
                         (default #t))
  (persistent?           nscd-cache-persistent?   ;Boolean
                         (default #t))
  (shared?               nscd-cache-shared?       ;Boolean
                         (default #t))
  (max-database-size     nscd-cache-max-database-size ;integer
                         (default (* 32 (expt 2 20))))
  (auto-propagate?       nscd-cache-auto-propagate? ;Boolean
                         (default #t)))

(define %nscd-default-caches
  ;; Caches that we want to enable by default.  Note that when providing an
  ;; empty nscd.conf, all caches are disabled.
  (list (nscd-cache (database 'hosts)

                    ;; Aggressively cache the host name cache to improve
                    ;; privacy and resilience.
                    (positive-time-to-live (* 3600 12))
                    (negative-time-to-live 20)
                    (persistent? #t))

        (nscd-cache (database 'services)

                    ;; Services are unlikely to change, so we can be even more
                    ;; aggressive.
                    (positive-time-to-live (* 3600 24))
                    (negative-time-to-live 3600)
                    (check-files? #t)             ;check /etc/services changes
                    (persistent? #t))))

(define %nscd-default-configuration
  ;; Default nscd configuration.
  (nscd-configuration))

(define (nscd.conf-file config)
  "Return the @file{nscd.conf} configuration file for @var{config}, an
@code{<nscd-configuration>} object."
  (define cache->config
    (match-lambda
      (($ <nscd-cache> (= symbol->string database)
                       positive-ttl negative-ttl size check-files?
                       persistent? shared? max-size propagate?)
       (string-append "\nenable-cache\t" database "\tyes\n"

                      "positive-time-to-live\t" database "\t"
                      (number->string positive-ttl) "\n"
                      "negative-time-to-live\t" database "\t"
                      (number->string negative-ttl) "\n"
                      "suggested-size\t" database "\t"
                      (number->string size) "\n"
                      "check-files\t" database "\t"
                      (if check-files? "yes\n" "no\n")
                      "persistent\t" database "\t"
                      (if persistent? "yes\n" "no\n")
                      "shared\t" database "\t"
                      (if shared? "yes\n" "no\n")
                      "max-db-size\t" database "\t"
                      (number->string max-size) "\n"
                      "auto-propagate\t" database "\t"
                      (if propagate? "yes\n" "no\n")))))

  (match config
    (($ <nscd-configuration> log-file debug-level caches)
     (plain-file "nscd.conf"
                 (string-append "\
# Configuration of libc's name service cache daemon (nscd).\n\n"
                                (if log-file
                                    (string-append "logfile\t" log-file)
                                    "")
                                "\n"
                                (if debug-level
                                    (string-append "debug-level\t"
                                                   (number->string debug-level))
                                    "")
                                "\n"
                                (string-concatenate
                                 (map cache->config caches)))))))

(define (nscd-action-procedure nscd config option)
  ;; XXX: This is duplicated from mcron; factorize.
  #~(lambda (_ . args)
      ;; Run 'nscd' in a pipe so we can explicitly redirect its output to
      ;; 'current-output-port', which at this stage is bound to the client
      ;; connection.
      (let ((pipe (apply open-pipe* OPEN_READ #$nscd
                         "-f" #$config #$option args)))
        (let loop ()
          (match (read-line pipe 'concat)
            ((? eof-object?)
             (catch 'system-error
               (lambda ()
                 (zero? (close-pipe pipe)))
               (lambda args
                 ;; There's a race with the SIGCHLD handler, which could
                 ;; call 'waitpid' before 'close-pipe' above does.  If we
                 ;; get ECHILD, that means we lost the race; in that case, we
                 ;; cannot tell what the exit code was (FIXME).
                 (or (= ECHILD (system-error-errno args))
                     (apply throw args)))))
            (line
             (display line)
             (loop)))))))

(define (nscd-actions nscd config)
  "Return Shepherd actions for NSCD."
  ;; Make this functionality available as actions because that's a simple way
  ;; to run the right 'nscd' binary with the right config file.
  (list (shepherd-action
         (name 'statistics)
         (documentation "Display statistics about nscd usage.")
         (procedure (nscd-action-procedure nscd config "--statistics")))
        (shepherd-action
         (name 'invalidate)
         (documentation
          "Invalidate the given cache--e.g., 'hosts' for host name lookups.")
         (procedure (nscd-action-procedure nscd config "--invalidate")))))

(define (nscd-shepherd-service config)
  "Return a shepherd service for CONFIG, an <nscd-configuration> object."
  (let ((nscd          (file-append (nscd-configuration-glibc config)
                                    "/sbin/nscd"))
        (nscd.conf     (nscd.conf-file config))
        (name-services (nscd-configuration-name-services config)))
    (list (shepherd-service
           (documentation "Run libc's name service cache daemon (nscd).")
           (provision '(nscd))
           (requirement '(user-processes))
           (start #~(make-forkexec-constructor
                     (list #$nscd "-f" #$nscd.conf "--foreground")

                     ;; Wait for the PID file.  However, the PID file is
                     ;; written before nscd is actually listening on its
                     ;; socket (XXX).
                     #:pid-file "/var/run/nscd/nscd.pid"

                     #:environment-variables
                     (list (string-append "LD_LIBRARY_PATH="
                                          (string-join
                                           (map (lambda (dir)
                                                  (string-append dir "/lib"))
                                                (list #$@name-services))
                                           ":")))))
           (stop #~(make-kill-destructor))
           (modules `((ice-9 popen)               ;for the actions
                      (ice-9 rdelim)
                      (ice-9 match)
                      ,@%default-modules))
           (actions (nscd-actions nscd nscd.conf))))))

(define nscd-activation
  ;; Actions to take before starting nscd.
  #~(begin
      (use-modules (guix build utils))
      (mkdir-p "/var/run/nscd")
      (mkdir-p "/var/db/nscd")                    ;for the persistent cache

      ;; In libc 2.25 nscd uses inotify to watch /etc/resolv.conf, but only if
      ;; that file exists when it is started.  Thus create it here.  Note: on
      ;; some systems, such as when NetworkManager is used, /etc/resolv.conf
      ;; is a symlink, hence 'lstat'.
      (unless (false-if-exception (lstat "/etc/resolv.conf"))
        (call-with-output-file "/etc/resolv.conf"
          (lambda (port)
            (display "# This is a placeholder.\n" port))))))

(define nscd-service-type
  (service-type (name 'nscd)
                (extensions
                 (list (service-extension activation-service-type
                                          (const nscd-activation))
                       (service-extension shepherd-root-service-type
                                          nscd-shepherd-service)))

                ;; This can be extended by providing additional name services
                ;; such as nss-mdns.
                (compose concatenate)
                (extend (lambda (config name-services)
                          (nscd-configuration
                           (inherit config)
                           (name-services (append
                                           (nscd-configuration-name-services config)
                                           name-services)))))
                (default-value %nscd-default-configuration)
                (description
                 "Runs libc's @dfn{name service cache daemon} (nscd) with the
given configuration---an @code{<nscd-configuration>} object.  @xref{Name
Service Switch}, for an example.")))

(define* (nscd-service #:optional (config %nscd-default-configuration))
  "Return a service that runs libc's name service cache daemon (nscd) with the
given @var{config}---an @code{<nscd-configuration>} object.  @xref{Name
Service Switch}, for an example."
  (service nscd-service-type config))


(define-record-type* <syslog-configuration>
  syslog-configuration  make-syslog-configuration
  syslog-configuration?
  (syslogd              syslog-configuration-syslogd
                        (default (file-append inetutils "/libexec/syslogd")))
  (config-file          syslog-configuration-config-file
                        (default %default-syslog.conf)))

(define syslog-service-type
  (shepherd-service-type
   'syslog
   (lambda (config)
     (shepherd-service
      (documentation "Run the syslog daemon (syslogd).")
      (provision '(syslogd))
      (requirement '(user-processes))
      (start #~(make-forkexec-constructor
                (list #$(syslog-configuration-syslogd config)
                      "--rcfile" #$(syslog-configuration-config-file config))
                #:pid-file "/var/run/syslog.pid"))
      (stop #~(make-kill-destructor))))))

;; Snippet adapted from the GNU inetutils manual.
(define %default-syslog.conf
  (plain-file "syslog.conf" "
     # Log all error messages, authentication messages of
     # level notice or higher and anything of level err or
     # higher to the console.
     # Don't log private authentication messages!
     *.alert;auth.notice;authpriv.none       /dev/console

     # Log anything (except mail) of level info or higher.
     # Don't log private authentication messages!
     *.info;mail.none;authpriv.none          /var/log/messages

     # Like /var/log/messages, but also including \"debug\"-level logs.
     *.debug;mail.none;authpriv.none         /var/log/debug

     # Same, in a different place.
     *.info;mail.none;authpriv.none          /dev/tty12

     # The authpriv file has restricted access.
     authpriv.*                              /var/log/secure

     # Log all the mail messages in one place.
     mail.*                                  /var/log/maillog
"))

(define* (syslog-service #:optional (config (syslog-configuration)))
  "Return a service that runs @command{syslogd} and takes
@var{<syslog-configuration>} as a parameter.

@xref{syslogd invocation,,, inetutils, GNU Inetutils}, for more
information on the configuration file syntax."
  (service syslog-service-type config))


(define pam-limits-service-type
  (let ((security-limits
         ;; Create /etc/security containing the provided "limits.conf" file.
         (lambda (limits-file)
           `(("security"
              ,(computed-file
                "security"
                #~(begin
                    (mkdir #$output)
                    (stat #$limits-file)
                    (symlink #$limits-file
                             (string-append #$output "/limits.conf"))))))))
        (pam-extension
         (lambda (pam)
           (let ((pam-limits (pam-entry
                              (control "required")
                              (module "pam_limits.so")
                              (arguments '("conf=/etc/security/limits.conf")))))
             (if (member (pam-service-name pam)
                         '("login" "su" "slim" "gdm-password"))
                 (pam-service
                  (inherit pam)
                  (session (cons pam-limits
                                 (pam-service-session pam))))
                 pam)))))
    (service-type
     (name 'limits)
     (extensions
      (list (service-extension etc-service-type security-limits)
            (service-extension pam-root-service-type
                               (lambda _ (list pam-extension)))))
     (description
      "Install the specified resource usage limits by populating
@file{/etc/security/limits.conf} and using the @code{pam_limits}
authentication module."))))

(define* (pam-limits-service #:optional (limits '()))
  "Return a service that makes selected programs respect the list of
pam-limits-entry specified in LIMITS via pam_limits.so."
  (service pam-limits-service-type
           (plain-file "limits.conf"
                       (string-join (map pam-limits-entry->string limits)
                                    "\n"))))


;;;
;;; Guix services.
;;;

(define* (guix-build-accounts count #:key
                              (group "guixbuild")
                              (shadow shadow))
  "Return a list of COUNT user accounts for Guix build users with the given
GID."
  (unfold (cut > <> count)
          (lambda (n)
            (user-account
             (name (format #f "guixbuilder~2,'0d" n))
             (system? #t)
             (group group)

             ;; guix-daemon expects GROUP to be listed as a
             ;; supplementary group too:
             ;; <http://lists.gnu.org/archive/html/bug-guix/2013-01/msg00239.html>.
             (supplementary-groups (list group "kvm"))

             (comment (format #f "Guix Build User ~2d" n))
             (home-directory "/var/empty")
             (shell (file-append shadow "/sbin/nologin"))))
          1+
          1))

(define not-config?
  ;; Select (guix …) and (gnu …) modules, except (guix config).
  (match-lambda
    (('guix 'config) #f)
    (('guix rest ...) #t)
    (('gnu rest ...) #t)
    (rest #f)))

(define (substitute-key-authorization keys guix)
  "Return a gexp with code to register KEYS, a list of files containing 'guix
archive' public keys, with GUIX."
  (define default-acl
    (with-extensions (list guile-gcrypt)
      (with-imported-modules `(((guix config) => ,(make-config.scm))
                               ,@(source-module-closure '((guix pki))
                                                        #:select? not-config?))
        (computed-file "acl"
                       #~(begin
                           (use-modules (guix pki)
                                        (gcrypt pk-crypto)
                                        (ice-9 rdelim))

                           (define keys
                             (map (lambda (file)
                                    (call-with-input-file file
                                      (compose string->canonical-sexp
                                               read-string)))
                                  '(#$@keys)))

                           (call-with-output-file #$output
                             (lambda (port)
                               (write-acl (public-keys->acl keys)
                                          port))))))))

  (with-imported-modules '((guix build utils))
    #~(begin
        (use-modules (guix build utils))

        (unless (file-exists? "/etc/guix/acl")
          (mkdir-p "/etc/guix")
          (copy-file #+default-acl "/etc/guix/acl")
          (chmod "/etc/guix/acl" #o600)))))

(define %default-authorized-guix-keys
  ;; List of authorized substitute keys.
  (list (file-append guix "/share/guix/berlin.guixsd.org.pub")))

(define-record-type* <guix-configuration>
  guix-configuration make-guix-configuration
  guix-configuration?
  (guix             guix-configuration-guix       ;<package>
                    (default guix))
  (build-group      guix-configuration-build-group ;string
                    (default "guixbuild"))
  (build-accounts   guix-configuration-build-accounts ;integer
                    (default 10))
  (authorize-key?   guix-configuration-authorize-key? ;Boolean
                    (default #t))
  (authorized-keys  guix-configuration-authorized-keys ;list of gexps
                    (default %default-authorized-guix-keys))
  (use-substitutes? guix-configuration-use-substitutes? ;Boolean
                    (default #t))
  (substitute-urls  guix-configuration-substitute-urls ;list of strings
                    (default %default-substitute-urls))
  (chroot-directories guix-configuration-chroot-directories ;list of file-like/strings
                      (default '()))
  (max-silent-time  guix-configuration-max-silent-time ;integer
                    (default 0))
  (timeout          guix-configuration-timeout    ;integer
                    (default 0))
  (log-compression  guix-configuration-log-compression
                    (default 'bzip2))
  (extra-options    guix-configuration-extra-options ;list of strings
                    (default '()))
  (log-file         guix-configuration-log-file   ;string
                    (default "/var/log/guix-daemon.log"))
  (http-proxy       guix-http-proxy               ;string | #f
                    (default #f))
  (tmpdir           guix-tmpdir                   ;string | #f
                    (default #f)))

(define %default-guix-configuration
  (guix-configuration))

(define (guix-shepherd-service config)
  "Return a <shepherd-service> for the Guix daemon service with CONFIG."
  (match-record config <guix-configuration>
    (guix build-group build-accounts authorize-key? authorized-keys
          use-substitutes? substitute-urls max-silent-time timeout
          log-compression extra-options log-file http-proxy tmpdir
          chroot-directories)
    (list (shepherd-service
           (documentation "Run the Guix daemon.")
           (provision '(guix-daemon))
           (requirement '(user-processes))
           (modules '((srfi srfi-1)))
           (start
            #~(make-forkexec-constructor
               (cons* #$(file-append guix "/bin/guix-daemon")
                      "--build-users-group" #$build-group
                      "--max-silent-time" #$(number->string max-silent-time)
                      "--timeout" #$(number->string timeout)
                      "--log-compression" #$(symbol->string log-compression)
                      #$@(if use-substitutes?
                             '()
                             '("--no-substitutes"))
                      "--substitute-urls" #$(string-join substitute-urls)
                      #$@extra-options

                      ;; Add CHROOT-DIRECTORIES and all their dependencies (if
                      ;; these are store items) to the chroot.
                      (append-map (lambda (file)
                                    (append-map (lambda (directory)
                                                  (list "--chroot-directory"
                                                        directory))
                                                (call-with-input-file file
                                                  read)))
                                  '#$(map references-file chroot-directories)))

               #:environment-variables
               (list #$@(if http-proxy
                            (list (string-append "http_proxy=" http-proxy))
                            '())
                     #$@(if tmpdir
                            (list (string-append "TMPDIR=" tmpdir))
                            '())

                     ;; Make sure we run in a UTF-8 locale so that 'guix
                     ;; offload' correctly restores nars that contain UTF-8
                     ;; file names such as 'nss-certs'.  See
                     ;; <https://bugs.gnu.org/32942>.
                     (string-append "GUIX_LOCPATH="
                                    #$glibc-utf8-locales "/lib/locale")
                     "LC_ALL=en_US.utf8")

               #:log-file #$log-file))
           (stop #~(make-kill-destructor))))))

(define (guix-accounts config)
  "Return the user accounts and user groups for CONFIG."
  (match config
    (($ <guix-configuration> _ build-group build-accounts)
     (cons (user-group
            (name build-group)
            (system? #t)

            ;; Use a fixed GID so that we can create the store with the right
            ;; owner.
            (id 30000))
           (guix-build-accounts build-accounts
                                #:group build-group)))))

(define (guix-activation config)
  "Return the activation gexp for CONFIG."
  (match config
    (($ <guix-configuration> guix build-group build-accounts authorize-key? keys)
     ;; Assume that the store has BUILD-GROUP as its group.  We could
     ;; otherwise call 'chown' here, but the problem is that on a COW overlayfs,
     ;; chown leads to an entire copy of the tree, which is a bad idea.

     ;; Optionally authorize substitute server keys.
     (if authorize-key?
         (substitute-key-authorization keys guix)
         #~#f))))

(define* (references-file item #:optional (name "references"))
  "Return a file that contains the list of references of ITEM."
  (if (struct? item)                              ;lowerable object
      (computed-file name
                     (with-imported-modules (source-module-closure
                                             '((guix build store-copy)))
                       #~(begin
                           (use-modules (guix build store-copy))

                           (call-with-output-file #$output
                             (lambda (port)
                               (write (map store-info-item
                                           (call-with-input-file "graph"
                                             read-reference-graph))
                                      port)))))
                     #:options `(#:local-build? #f
                                 #:references-graphs (("graph" ,item))))
      (plain-file name "()")))

(define guix-service-type
  (service-type
   (name 'guix)
   (extensions
    (list (service-extension shepherd-root-service-type guix-shepherd-service)
          (service-extension account-service-type guix-accounts)
          (service-extension activation-service-type guix-activation)
          (service-extension profile-service-type
                             (compose list guix-configuration-guix))))

   ;; Extensions can specify extra directories to add to the build chroot.
   (compose concatenate)
   (extend (lambda (config directories)
             (guix-configuration
              (inherit config)
              (chroot-directories
               (append (guix-configuration-chroot-directories config)
                       directories)))))

   (default-value (guix-configuration))
   (description
    "Run the build daemon of GNU@tie{}Guix, aka. @command{guix-daemon}.")))

(define-deprecated (guix-service #:optional
                                 (config %default-guix-configuration))
  guix-service-type
  "Return a service that runs the Guix build daemon according to
@var{config}."
  (service guix-service-type config))


(define-record-type* <guix-publish-configuration>
  guix-publish-configuration make-guix-publish-configuration
  guix-publish-configuration?
  (guix    guix-publish-configuration-guix        ;package
           (default guix))
  (port    guix-publish-configuration-port        ;number
           (default 80))
  (host    guix-publish-configuration-host        ;string
           (default "localhost"))
  (compression       guix-publish-configuration-compression
                     (thunked)
                     (default (default-compression this-record
                                (current-source-location))))
  (compression-level %guix-publish-configuration-compression-level ;deprecated
                     (default #f))
  (nar-path    guix-publish-configuration-nar-path ;string
               (default "nar"))
  (cache       guix-publish-configuration-cache   ;#f | string
               (default #f))
  (workers     guix-publish-configuration-workers ;#f | integer
               (default #f))
  (ttl         guix-publish-configuration-ttl     ;#f | integer
               (default #f)))

(define-deprecated (guix-publish-configuration-compression-level config)
  "Return a compression level, the old way."
  (match (guix-publish-configuration-compression config)
    (((_ level) _ ...) level)))

(define (default-compression config properties)
  "Return the default 'guix publish' compression according to CONFIG, and
raise a deprecation warning if the 'compression-level' field was used."
  (match (%guix-publish-configuration-compression-level config)
    (#f
     '(("gzip" 3)))
    (level
     (warn-about-deprecation 'compression-level properties
                             #:replacement 'compression)
     `(("gzip" ,level)))))

(define (guix-publish-shepherd-service config)
  (define (config->compression-options config)
    (match (guix-publish-configuration-compression config)
      (()                                   ;empty list means "no compression"
       '("-C0"))
      (lst
       (append-map (match-lambda
                     ((type level)
                      `("-C" ,(string-append type ":"
                                             (number->string level)))))
                   lst))))

  (match-record config <guix-publish-configuration>
    (guix port host nar-path cache workers ttl)
    (list (shepherd-service
           (provision '(guix-publish))
           (requirement '(guix-daemon))
           (start #~(make-forkexec-constructor
                     (list #$(file-append guix "/bin/guix")
                           "publish" "-u" "guix-publish"
                           "-p" #$(number->string port)
                           #$@(config->compression-options config)
                           (string-append "--nar-path=" #$nar-path)
                           (string-append "--listen=" #$host)
                           #$@(if workers
                                  #~((string-append "--workers="
                                                    #$(number->string
                                                       workers)))
                                  #~())
                           #$@(if ttl
                                  #~((string-append "--ttl="
                                                    #$(number->string ttl)
                                                    "s"))
                                  #~())
                           #$@(if cache
                                  #~((string-append "--cache=" #$cache))
                                  #~()))

                     ;; Make sure we run in a UTF-8 locale so we can produce
                     ;; nars for packages that contain UTF-8 file names such
                     ;; as 'nss-certs'.  See <https://bugs.gnu.org/26948>.
                     #:environment-variables
                     (list (string-append "GUIX_LOCPATH="
                                          #$glibc-utf8-locales "/lib/locale")
                           "LC_ALL=en_US.utf8")
                     #:log-file "/var/log/guix-publish.log"))
           (stop #~(make-kill-destructor))))))

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

(define %guix-publish-log-rotations
  (list (log-rotation
         (files (list "/var/log/guix-publish.log")))))

(define (guix-publish-activation config)
  (let ((cache (guix-publish-configuration-cache config)))
    (if cache
        (with-imported-modules '((guix build utils))
          #~(begin
              (use-modules (guix build utils))

              (mkdir-p #$cache)
              (let* ((pw  (getpw "guix-publish"))
                     (uid (passwd:uid pw))
                     (gid (passwd:gid pw)))
                (chown #$cache uid gid))))
        #t)))

(define guix-publish-service-type
  (service-type (name 'guix-publish)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          guix-publish-shepherd-service)
                       (service-extension account-service-type
                                          (const %guix-publish-accounts))
                       (service-extension rottlog-service-type
                                          (const %guix-publish-log-rotations))
                       (service-extension activation-service-type
                                          guix-publish-activation)))
                (default-value (guix-publish-configuration))
                (description
                 "Add a Shepherd service running @command{guix publish}, a
command that allows you to share pre-built binaries with others over HTTP.")))

(define-deprecated (guix-publish-service #:key (guix guix)
                                         (port 80) (host "localhost"))
  guix-publish-service-type
  "Return a service that runs @command{guix publish} listening on @var{host}
and @var{port} (@pxref{Invoking guix publish}).

This assumes that @file{/etc/guix} already contains a signing key pair as
created by @command{guix archive --generate-key} (@pxref{Invoking guix
archive}).  If that is not the case, the service will fail to start."
  ;; Deprecated.
  (service guix-publish-service-type
           (guix-publish-configuration (guix guix) (port port) (host host))))


;;;
;;; Udev.
;;;

(define-record-type* <udev-configuration>
  udev-configuration make-udev-configuration
  udev-configuration?
  (udev   udev-configuration-udev                 ;<package>
          (default eudev))
  (rules  udev-configuration-rules                ;list of <package>
          (default '())))

(define (udev-rules-union packages)
  "Return the union of the @code{lib/udev/rules.d} directories found in each
item of @var{packages}."
  (define build
    (with-imported-modules '((guix build union)
                             (guix build utils))
      #~(begin
          (use-modules (guix build union)
                       (guix build utils)
                       (srfi srfi-1)
                       (srfi srfi-26))

          (define %standard-locations
            '("/lib/udev/rules.d" "/libexec/udev/rules.d"))

          (define (rules-sub-directory directory)
            ;; Return the sub-directory of DIRECTORY containing udev rules, or
            ;; #f if none was found.
            (find directory-exists?
                  (map (cut string-append directory <>) %standard-locations)))

          (mkdir-p (string-append #$output "/lib/udev"))
          (union-build (string-append #$output "/lib/udev/rules.d")
                       (filter-map rules-sub-directory '#$packages)))))

  (computed-file "udev-rules" build))

(define (udev-rule file-name contents)
  "Return a directory with a udev rule file FILE-NAME containing CONTENTS."
  (computed-file file-name
                 (with-imported-modules '((guix build utils))
                   #~(begin
                       (use-modules (guix build utils))

                       (define rules.d
                         (string-append #$output "/lib/udev/rules.d"))

                       (mkdir-p rules.d)
                       (call-with-output-file
                           (string-append rules.d "/" #$file-name)
                         (lambda (port)
                           (display #$contents port)))))))

(define (file->udev-rule file-name file)
  "Return a directory with a udev rule file FILE-NAME which is a copy of FILE."
  (computed-file file-name
                 (with-imported-modules '((guix build utils))
                   #~(begin
                       (use-modules (guix build utils))

                       (define rules.d
                         (string-append #$output "/lib/udev/rules.d"))

                       (define file-copy-dest
                         (string-append rules.d "/" #$file-name))

                       (mkdir-p rules.d)
                       (copy-file #$file file-copy-dest)))))

(define kvm-udev-rule
  ;; Return a directory with a udev rule that changes the group of /dev/kvm to
  ;; "kvm" and makes it #o660.  Apparently QEMU-KVM used to ship this rule,
  ;; but now we have to add it by ourselves.

  ;; Build users are part of the "kvm" group, so we can fearlessly make
  ;; /dev/kvm 660 (see <http://bugs.gnu.org/18994>, for background.)
  (udev-rule "90-kvm.rules"
             "KERNEL==\"kvm\", GROUP=\"kvm\", MODE=\"0660\"\n"))

(define udev-shepherd-service
  ;; Return a <shepherd-service> for UDEV with RULES.
  (match-lambda
    (($ <udev-configuration> udev rules)
     (let* ((rules     (udev-rules-union (cons* udev kvm-udev-rule rules)))
            (udev.conf (computed-file "udev.conf"
                                      #~(call-with-output-file #$output
                                          (lambda (port)
                                            (format port
                                                    "udev_rules=\"~a/lib/udev/rules.d\"\n"
                                                    #$rules))))))
       (list
        (shepherd-service
         (provision '(udev))

         ;; Udev needs /dev to be a 'devtmpfs' mount so that new device nodes can
         ;; be added: see
         ;; <http://www.linuxfromscratch.org/lfs/view/development/chapter07/udev.html>.
         (requirement '(root-file-system))

         (documentation "Populate the /dev directory, dynamically.")
         (start #~(lambda ()
                    (define udevd
                      ;; 'udevd' from eudev.
                      #$(file-append udev "/sbin/udevd"))

                    (define (wait-for-udevd)
                      ;; Wait until someone's listening on udevd's control
                      ;; socket.
                      (let ((sock (socket AF_UNIX SOCK_SEQPACKET 0)))
                        (let try ()
                          (catch 'system-error
                            (lambda ()
                              (connect sock PF_UNIX "/run/udev/control")
                              (close-port sock))
                            (lambda args
                              (format #t "waiting for udevd...~%")
                              (usleep 500000)
                              (try))))))

                    ;; Allow udev to find the modules.
                    (setenv "LINUX_MODULE_DIRECTORY"
                            "/run/booted-system/kernel/lib/modules")

                    ;; The first one is for udev, the second one for eudev.
                    (setenv "UDEV_CONFIG_FILE" #$udev.conf)
                    (setenv "EUDEV_RULES_DIRECTORY"
                            #$(file-append rules "/lib/udev/rules.d"))

                    (let* ((kernel-release
                            (utsname:release (uname)))
                           (linux-module-directory
                            (getenv "LINUX_MODULE_DIRECTORY"))
                           (directory
                            (string-append linux-module-directory "/"
                                           kernel-release))
                           (old-umask (umask #o022)))
                      ;; If we're in a container, DIRECTORY might not exist,
                      ;; for instance because the host runs a different
                      ;; kernel.  In that case, skip it; we'll just miss a few
                      ;; nodes like /dev/fuse.
                      (when (file-exists? directory)
                        (make-static-device-nodes directory))
                      (umask old-umask))

                    (let ((pid (fork+exec-command (list udevd))))
                      ;; Wait until udevd is up and running.  This appears to
                      ;; be needed so that the events triggered below are
                      ;; actually handled.
                      (wait-for-udevd)

                      ;; Trigger device node creation.
                      (system* #$(file-append udev "/bin/udevadm")
                               "trigger" "--action=add")

                      ;; Wait for things to settle down.
                      (system* #$(file-append udev "/bin/udevadm")
                               "settle")
                      pid)))
         (stop #~(make-kill-destructor))

         ;; When halting the system, 'udev' is actually killed by
         ;; 'user-processes', i.e., before its own 'stop' method was called.
         ;; Thus, make sure it is not respawned.
         (respawn? #f)
         ;; We need additional modules.
         (modules `((gnu build linux-boot)
                    ,@%default-modules))

         (actions (list (shepherd-action
                         (name 'rules)
                         (documentation "Display the directory containing
the udev rules in use.")
                         (procedure #~(lambda (_)
                                        (display #$rules)
                                        (newline))))))))))))

(define udev-service-type
  (service-type (name 'udev)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          udev-shepherd-service)))

                (compose concatenate)           ;concatenate the list of rules
                (extend (lambda (config rules)
                          (match config
                            (($ <udev-configuration> udev initial-rules)
                             (udev-configuration
                              (udev udev)
                              (rules (append initial-rules rules)))))))
                (default-value (udev-configuration))
                (description
                 "Run @command{udev}, which populates the @file{/dev}
directory dynamically.  Get extra rules from the packages listed in the
@code{rules} field of its value, @code{udev-configuration} object.")))

(define* (udev-service #:key (udev eudev) (rules '()))
  "Run @var{udev}, which populates the @file{/dev} directory dynamically.  Get
extra rules from the packages listed in @var{rules}."
  (service udev-service-type
           (udev-configuration (udev udev) (rules rules))))

(define swap-service-type
  (shepherd-service-type
   'swap
   (lambda (device)
     (define requirement
       (if (string-prefix? "/dev/mapper/" device)
           (list (symbol-append 'device-mapping-
                                (string->symbol (basename device))))
           '()))

     (shepherd-service
      (provision (list (symbol-append 'swap- (string->symbol device))))
      (requirement `(udev ,@requirement))
      (documentation "Enable the given swap device.")
      (start #~(lambda ()
                 (restart-on-EINTR (swapon #$device))
                 #t))
      (stop #~(lambda _
                (restart-on-EINTR (swapoff #$device))
                #f))
      (respawn? #f)))))

(define (swap-service device)
  "Return a service that uses @var{device} as a swap device."
  (service swap-service-type device))

(define %default-gpm-options
  ;; Default options for GPM.
  '("-m" "/dev/input/mice" "-t" "ps2"))

(define-record-type* <gpm-configuration>
  gpm-configuration make-gpm-configuration gpm-configuration?
  (gpm      gpm-configuration-gpm                 ;package
            (default gpm))
  (options  gpm-configuration-options             ;list of strings
            (default %default-gpm-options)))

(define gpm-shepherd-service
  (match-lambda
    (($ <gpm-configuration> gpm options)
     (list (shepherd-service
            (requirement '(udev))
            (provision '(gpm))
            (start #~(lambda ()
                       ;; 'gpm' runs in the background and sets a PID file.
                       ;; Note that it requires running as "root".
                       (false-if-exception (delete-file "/var/run/gpm.pid"))
                       (fork+exec-command (list #$(file-append gpm "/sbin/gpm")
                                                #$@options))

                       ;; Wait for the PID file to appear; declare failure if
                       ;; it doesn't show up.
                       (let loop ((i 3))
                         (or (file-exists? "/var/run/gpm.pid")
                             (if (zero? i)
                                 #f
                                 (begin
                                   (sleep 1)
                                   (loop (1- i))))))))

            (stop #~(lambda (_)
                      ;; Return #f if successfully stopped.
                      (not (zero? (system* #$(file-append gpm "/sbin/gpm")
                                           "-k"))))))))))

(define gpm-service-type
  (service-type (name 'gpm)
                (extensions
                 (list (service-extension shepherd-root-service-type
                                          gpm-shepherd-service)))
                (default-value (gpm-configuration))
                (description
                 "Run GPM, the general-purpose mouse daemon, with the given
command-line options.  GPM allows users to use the mouse in the console,
notably to select, copy, and paste text.  The default options use the
@code{ps2} protocol, which works for both USB and PS/2 mice.")))

(define-deprecated (gpm-service #:key (gpm gpm)
                                (options %default-gpm-options))
  gpm-service-type
  "Run @var{gpm}, the general-purpose mouse daemon, with the given
command-line @var{options}.  GPM allows users to use the mouse in the console,
notably to select, copy, and paste text.  The default value of @var{options}
uses the @code{ps2} protocol, which works for both USB and PS/2 mice.

This service is not part of @var{%base-services}."
  ;; To test in QEMU, use "-usbdevice mouse" and then, in the monitor, use
  ;; "info mice" and "mouse_set X" to use the right mouse.
  (service gpm-service-type
           (gpm-configuration (gpm gpm) (options options))))

(define-record-type* <kmscon-configuration>
  kmscon-configuration     make-kmscon-configuration
  kmscon-configuration?
  (kmscon                  kmscon-configuration-kmscon
                           (default kmscon))
  (virtual-terminal        kmscon-configuration-virtual-terminal)
  (login-program           kmscon-configuration-login-program
                           (default (file-append shadow "/bin/login")))
  (login-arguments         kmscon-configuration-login-arguments
                           (default '("-p")))
  (auto-login              kmscon-configuration-auto-login
                           (default #f))
  (hardware-acceleration?  kmscon-configuration-hardware-acceleration?
                           (default #f))) ; #t causes failure

(define kmscon-service-type
  (shepherd-service-type
   'kmscon
   (lambda (config)
     (let ((kmscon (kmscon-configuration-kmscon config))
           (virtual-terminal (kmscon-configuration-virtual-terminal config))
           (login-program (kmscon-configuration-login-program config))
           (login-arguments (kmscon-configuration-login-arguments config))
           (auto-login (kmscon-configuration-auto-login config))
           (hardware-acceleration? (kmscon-configuration-hardware-acceleration? config)))

       (define kmscon-command
         #~(list
            #$(file-append kmscon "/bin/kmscon") "--login"
            "--vt" #$virtual-terminal
            "--no-switchvt" ;Prevent a switch to the virtual terminal.
            #$@(if hardware-acceleration? '("--hwaccel") '())
            "--login" "--"
            #$login-program #$@login-arguments
            #$@(if auto-login
                   #~(#$auto-login)
                   #~())))

       (shepherd-service
        (documentation "kmscon virtual terminal")
        (requirement '(user-processes udev dbus-system))
        (provision (list (symbol-append 'term- (string->symbol virtual-terminal))))
        (start #~(make-forkexec-constructor #$kmscon-command))
        (stop #~(make-kill-destructor)))))))

(define-record-type* <static-networking>
  static-networking make-static-networking
  static-networking?
  (interface static-networking-interface)
  (ip static-networking-ip)
  (netmask static-networking-netmask
           (default #f))
  (gateway static-networking-gateway              ;FIXME: doesn't belong here
           (default #f))
  (provision static-networking-provision
             (default #f))
  (requirement static-networking-requirement
               (default '()))
  (name-servers static-networking-name-servers    ;FIXME: doesn't belong here
                (default '())))

(define static-networking-shepherd-service
  (match-lambda
    (($ <static-networking> interface ip netmask gateway provision
                            requirement name-servers)
     (let ((loopback? (and provision (memq 'loopback provision))))
       (shepherd-service

        (documentation
         "Bring up the networking interface using a static IP address.")
        (requirement requirement)
        (provision (or provision
                       (list (symbol-append 'networking-
                                            (string->symbol interface)))))

        (start #~(lambda _
                   ;; Return #t if successfully started.
                   (let* ((addr     (inet-pton AF_INET #$ip))
                          (sockaddr (make-socket-address AF_INET addr 0))
                          (mask     (and #$netmask
                                         (inet-pton AF_INET #$netmask)))
                          (maskaddr (and mask
                                         (make-socket-address AF_INET
                                                              mask 0)))
                          (gateway  (and #$gateway
                                         (inet-pton AF_INET #$gateway)))
                          (gatewayaddr (and gateway
                                            (make-socket-address AF_INET
                                                                 gateway 0))))
                     (configure-network-interface #$interface sockaddr
                                                  (logior IFF_UP
                                                          #$(if loopback?
                                                                #~IFF_LOOPBACK
                                                                0))
                                                  #:netmask maskaddr)
                     (when gateway
                       (let ((sock (socket AF_INET SOCK_DGRAM 0)))
                         (add-network-route/gateway sock gatewayaddr)
                         (close-port sock))))))
        (stop #~(lambda _
                  ;; Return #f is successfully stopped.
                  (let ((sock (socket AF_INET SOCK_STREAM 0)))
                    (when #$gateway
                      (delete-network-route sock
                                            (make-socket-address
                                             AF_INET INADDR_ANY 0)))
                    (set-network-interface-flags sock #$interface 0)
                    (close-port sock)
                    #f)))
        (respawn? #f))))))

(define (static-networking-etc-files interfaces)
  "Return a /etc/resolv.conf entry for INTERFACES or the empty list."
  (match (delete-duplicates
          (append-map static-networking-name-servers
                      interfaces))
    (()
     '())
    ((name-servers ...)
     (let ((content (string-join
                     (map (cut string-append "nameserver " <>)
                          name-servers)
                     "\n" 'suffix)))
       `(("resolv.conf"
          ,(plain-file "resolv.conf"
                       (string-append "\
# Generated by 'static-networking-service'.\n"
                                      content))))))))

(define (static-networking-shepherd-services interfaces)
  "Return the list of Shepherd services to bring up INTERFACES, a list of
<static-networking> objects."
  (define (loopback? service)
    (memq 'loopback (shepherd-service-provision service)))

  (let ((services (map static-networking-shepherd-service interfaces)))
    (match (remove loopback? services)
      (()
       ;; There's no interface other than 'loopback', so we assume that the
       ;; 'networking' service will be provided by dhclient or similar.
       services)
      ((non-loopback ...)
       ;; Assume we're providing all the interfaces, and thus, provide a
       ;; 'networking' service.
       (cons (shepherd-service
              (provision '(networking))
              (requirement (append-map shepherd-service-provision
                                       services))
              (start #~(const #t))
              (stop #~(const #f))
              (documentation "Bring up all the networking interfaces."))
             services)))))

(define static-networking-service-type
  ;; The service type for statically-defined network interfaces.
  (service-type (name 'static-networking)
                (extensions
                 (list
                  (service-extension shepherd-root-service-type
                                     static-networking-shepherd-services)
                  (service-extension etc-service-type
                                     static-networking-etc-files)))
                (compose concatenate)
                (extend append)
                (description
                 "Turn up the specified network interfaces upon startup,
with the given IP address, gateway, netmask, and so on.  The value for
services of this type is a list of @code{static-networking} objects, one per
network interface.")))

(define* (static-networking-service interface ip
                                    #:key
                                    netmask gateway provision
                                    ;; Most interfaces require udev to be usable.
                                    (requirement '(udev))
                                    (name-servers '()))
  "Return a service that starts @var{interface} with address @var{ip}.  If
@var{netmask} is true, use it as the network mask.  If @var{gateway} is true,
it must be a string specifying the default network gateway.

This procedure can be called several times, one for each network
interface of interest.  Behind the scenes what it does is extend
@code{static-networking-service-type} with additional network interfaces
to handle."
  (simple-service 'static-network-interface
                  static-networking-service-type
                  (list (static-networking (interface interface) (ip ip)
                                           (netmask netmask) (gateway gateway)
                                           (provision provision)
                                           (requirement requirement)
                                           (name-servers name-servers)))))


(define %base-services
  ;; Convenience variable holding the basic services.
  (list (service login-service-type)

        (service virtual-terminal-service-type)
        (service console-font-service-type
                 (map (lambda (tty)
                        (cons tty %default-console-font))
                      '("tty1" "tty2" "tty3" "tty4" "tty5" "tty6")))

        (service agetty-service-type (agetty-configuration
                                       (extra-options '("-L")) ; no carrier detect
                                       (term "vt100")
                                       (tty #f))) ; automatic

        (service mingetty-service-type (mingetty-configuration
                                         (tty "tty1")))
        (service mingetty-service-type (mingetty-configuration
                                         (tty "tty2")))
        (service mingetty-service-type (mingetty-configuration
                                         (tty "tty3")))
        (service mingetty-service-type (mingetty-configuration
                                         (tty "tty4")))
        (service mingetty-service-type (mingetty-configuration
                                         (tty "tty5")))
        (service mingetty-service-type (mingetty-configuration
                                         (tty "tty6")))

        (service static-networking-service-type
                 (list (static-networking (interface "lo")
                                          (ip "127.0.0.1")
                                          (requirement '())
                                          (provision '(loopback)))))
        (syslog-service)
        (service urandom-seed-service-type)
        (service guix-service-type)
        (service nscd-service-type)

        ;; The LVM2 rules are needed as soon as LVM2 or the device-mapper is
        ;; used, so enable them by default.  The FUSE and ALSA rules are
        ;; less critical, but handy.
        (service udev-service-type
                 (udev-configuration
                   (rules (list lvm2 fuse alsa-utils crda))))

        (service special-files-service-type
                 `(("/bin/sh" ,(file-append (canonical-package bash)
                                            "/bin/sh"))
                   ("/usr/bin/env" ,(file-append (canonical-package coreutils)
                                                 "/bin/env"))))))

;;; base.scm ends here