summary refs log tree commit diff
path: root/gnu/installer/parted.scm
blob: 83a88368ef854a8dc7fa296d482edbcb0dd71521 (plain) (blame)
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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2019 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; 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 installer parted)
  #:use-module (gnu installer steps)
  #:use-module (gnu installer utils)
  #:use-module (gnu installer newt page)
  #:use-module (gnu system uuid)
  #:use-module ((gnu build file-systems)
                #:select (canonicalize-device-spec
                          find-partition-by-label
                          read-partition-uuid
                          read-luks-partition-uuid))
  #:use-module ((gnu build linux-boot)
                #:select (linux-command-line
                          find-long-option))
  #:use-module ((gnu build linux-modules)
                #:select (missing-modules))
  #:use-module ((gnu system linux-initrd)
                #:select (%base-initrd-modules))
  #:use-module (guix build syscalls)
  #:use-module (guix build utils)
  #:use-module (guix records)
  #:use-module (guix utils)
  #:use-module (guix i18n)
  #:use-module (parted)
  #:use-module (ice-9 format)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (rnrs io ports)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-19)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:export (<user-partition>
            user-partition
            make-user-partition
            user-partition?
            user-partition-name
            user-partition-type
            user-partition-file-name
            user-partition-disk-file-name
            user-partition-crypt-label
            user-partition-crypt-password
            user-partition-fs-type
            user-partition-bootable?
            user-partition-esp?
            user-partition-bios-grub?
            user-partition-size
            user-partition-start
            user-partition-end
            user-partition-mount-point
            user-partition-need-formatting?
            user-partition-parted-object

            find-esp-partition
            small-freespace-partition?
            esp-partition?
            boot-partition?
            efi-installation?
            default-esp-mount-point

            with-delay-device-in-use?
            force-device-sync
            non-install-devices
            partition-user-type
            user-fs-type-name
            partition-filesystem-user-type
            partition-get-flags
            partition->user-partition
            create-special-user-partitions
            find-user-partition-by-parted-object

            device-description
            partition-end-formatted
            partition-print-number
            partition-description
            partitions-descriptions
            user-partition-description

            &max-primary-exceeded
            max-primary-exceeded?
            &extended-creation-error
            extended-creation-error?
            &logical-creation-error
            logical-creation-error?

            can-create-partition?
            mklabel
            mkpart
            rmpart

            auto-partition!

            &no-root-mount-point
            no-root-mount-point?
            &cannot-read-uuid
            cannot-read-uuid?
            cannot-read-uuid-partition

            check-user-partitions
            set-user-partitions-file-name
            format-user-partitions
            mount-user-partitions
            umount-user-partitions
            with-mounted-partitions
            user-partitions->file-systems
            user-partitions->configuration

            init-parted
            free-parted))


;;;
;;; Partition record.
;;;

(define-record-type* <user-partition>
  user-partition make-user-partition
  user-partition?
  (name                 user-partition-name ;string
                        (default #f))
  (type                 user-partition-type
                        (default 'normal)) ; 'normal | 'logical | 'extended
  (file-name            user-partition-file-name
                        (default #f))
  (disk-file-name       user-partition-disk-file-name
                        (default #f))
  (crypt-label          user-partition-crypt-label
                        (default #f))
  (crypt-password       user-partition-crypt-password
                        (default #f))
  (fs-type              user-partition-fs-type
                        (default 'ext4))
  (bootable?            user-partition-bootable?
                        (default #f))
  (esp?                 user-partition-esp?
                        (default #f))
  (bios-grub?           user-partition-bios-grub?
                        (default #f))
  (size                 user-partition-size
                        (default #f))
  (start                user-partition-start ;start as string (e.g. '11MB')
                        (default #f))
  (end                  user-partition-end ;same as start
                        (default #f))
  (mount-point          user-partition-mount-point ;string
                        (default #f))
  (need-formatting?     user-partition-need-formatting? ; boolean
                        (default #f))
  (parted-object        user-partition-parted-object ; <partition> from parted
                        (default #f)))


;;
;; Utilities.
;;

(define (find-esp-partition partitions)
  "Find and return the ESP partition among PARTITIONS."
  (find esp-partition? partitions))

(define* (small-freespace-partition? device
                                     partition
                                     #:key (max-size MEBIBYTE-SIZE))
  "Return #t is PARTITION is a free-space partition with less a size strictly
inferior to MAX-SIZE, #f otherwise."
  (let ((size (partition-length partition))
        (max-sector-size (/ max-size
                            (device-sector-size device))))
    (< size max-sector-size)))

(define (partition-user-type partition)
  "Return the type of PARTITION, to be stored in the TYPE field of
<user-partition> record. It can be 'normal, 'extended or 'logical."
  (cond ((normal-partition? partition)
         'normal)
        ((extended-partition? partition)
         'extended)
        ((logical-partition? partition)
         'logical)
        (else #f)))

(define (esp-partition? partition)
  "Return #t if partition has the ESP flag, return #f otherwise."
  (let* ((disk (partition-disk partition))
         (disk-type (disk-disk-type disk)))
    (and (data-partition? partition)
         (partition-is-flag-available? partition PARTITION-FLAG-ESP)
         (partition-get-flag partition PARTITION-FLAG-ESP))))

(define (boot-partition? partition)
  "Return #t if partition has the boot flag, return #f otherwise."
  (and (data-partition? partition)
       (partition-is-flag-available? partition PARTITION-FLAG-BOOT)
       (partition-get-flag partition PARTITION-FLAG-BOOT)))


;; The default mount point for ESP partitions.
(define default-esp-mount-point
  (make-parameter "/boot/efi"))

(define (efi-installation?)
  "Return #t if an EFI installation should be performed, #f otherwise."
  (file-exists? "/sys/firmware/efi"))

(define (user-fs-type-name fs-type)
  "Return the name of FS-TYPE as specified by libparted."
  (case fs-type
    ((ext4)  "ext4")
    ((btrfs) "btrfs")
    ((fat16) "fat16")
    ((fat32) "fat32")
    ((jfs)   "jfs")
    ((ntfs)  "ntfs")
    ((xfs)   "xfs")
    ((swap)  "linux-swap")))

(define (user-fs-type->mount-type fs-type)
  "Return the mount type of FS-TYPE."
  (case fs-type
    ((ext4)  "ext4")
    ((btrfs) "btrfs")
    ((fat16) "vfat")
    ((fat32) "vfat")
    ((jfs)   "jfs")
    ((ntfs)  "ntfs")
    ((xfs)   "xfs")))

(define (partition-filesystem-user-type partition)
  "Return the filesystem type of PARTITION, to be stored in the FS-TYPE field
of <user-partition> record."
  (let ((fs-type (partition-fs-type partition)))
    (and fs-type
         (let ((name (filesystem-type-name fs-type)))
           (cond
            ((string=? name "ext4") 'ext4)
            ((string=? name "btrfs") 'btrfs)
            ((string=? name "fat16") 'fat16)
            ((string=? name "fat32") 'fat32)
            ((string=? name "jfs") 'jfs)
            ((string=? name "ntfs") 'ntfs)
            ((string=? name "xfs") 'xfs)
            ((or (string=? name "swsusp")
                 (string=? name "linux-swap(v0)")
                 (string=? name "linux-swap(v1)"))
             'swap)
            (else
             (error (format #f "Unhandled ~a fs-type~%" name))))))))

(define (partition-get-flags partition)
  "Return the list of flags supported by the given PARTITION."
  (filter-map (lambda (flag)
                (and (partition-get-flag partition flag)
                     flag))
              (partition-flags partition)))

(define (partition->user-partition partition)
  "Convert PARTITION into a <user-partition> record and return it."
  (let* ((disk (partition-disk partition))
         (device (disk-device disk))
         (disk-type (disk-disk-type disk))
         (has-name? (disk-type-check-feature
                     disk-type
                     DISK-TYPE-FEATURE-PARTITION-NAME))
         (name (and has-name?
                    (data-partition? partition)
                    (partition-get-name partition))))
    (user-partition
     (name (and (and name
                     (not (string=? name "")))
                name))
     (type (or (partition-user-type partition)
               'normal))
     (file-name (partition-get-path partition))
     (disk-file-name (device-path device))
     (fs-type (or (partition-filesystem-user-type partition)
                  'ext4))
     (mount-point (and (esp-partition? partition)
                       (default-esp-mount-point)))
     (bootable? (boot-partition? partition))
     (esp? (esp-partition? partition))
     (parted-object partition))))

(define (create-special-user-partitions partitions)
  "Return a list with a <user-partition> record describing the ESP partition
found in PARTITIONS, if any."
  (filter-map (lambda (partition)
                (and (esp-partition? partition)
                     (partition->user-partition partition)))
              partitions))

(define (find-user-partition-by-parted-object user-partitions
                                              partition)
  "Find and return the <user-partition> record in USER-PARTITIONS list which
PARTED-OBJECT field equals PARTITION, return #f if not found."
  (find (lambda (user-partition)
          (equal? (user-partition-parted-object user-partition)
                  partition))
        user-partitions))


;;
;; Devices
;;

(define (with-delay-device-in-use? file-name)
  "Call DEVICE-IN-USE? with a few retries, as the first re-read will often
fail. See rereadpt function in wipefs.c of util-linux for an explanation."
  ;; Kernel always return EINVAL for BLKRRPART on loopdevices.
  (and (not (string-match "/dev/loop*" file-name))
       (let loop ((try 16))
         (usleep 250000)
         (let ((in-use? (device-in-use? file-name)))
           (if (and in-use? (> try 0))
               (loop (- try 1))
               in-use?)))))

(define* (force-device-sync device)
  "Force a flushing of the given DEVICE."
  (device-open device)
  (device-sync device)
  (device-close device))

(define (remove-logical-devices)
  "Remove all active logical devices."
  (with-null-output-ports
   (invoke "dmsetup" "remove_all")))

(define (installation-device)
  "Return the installation device path."
  (let* ((cmdline (linux-command-line))
         (root (find-long-option "--root" cmdline)))
    (and root
         (canonicalize-device-spec (uuid root)))))

(define (non-install-devices)
  "Return all the available devices, except the install device."
  (define (read-only? device)
    (dynamic-wind
    (lambda ()
      (device-open device))
    (lambda ()
      (device-read-only? device))
    (lambda ()
      (device-close device))))

  ;; If parted reports that a device is read-only it is probably the
  ;; installation device. However, as this detection does not always work,
  ;; compare the device path to the installation device path read from the
  ;; command line.
  (let ((install-device (installation-device)))
    (remove (lambda (device)
              (let ((file-name (device-path device)))
                (or (read-only? device)
                    (and install-device
                         (string=? file-name install-device)))))
            (devices))))


;;
;; Disk and partition printing.
;;

(define* (device-description device #:optional disk)
  "Return a string describing the given DEVICE."
  (let* ((type (device-type device))
         (file-name (device-path device))
         (model (device-model device))
         (type-str (device-type->string type))
         (disk-type (if disk
                        (disk-disk-type disk)
                        (disk-probe device)))
         (length (device-length device))
         (sector-size (device-sector-size device))
         (end (unit-format-custom-byte device
                                       (* length sector-size)
                                       UNIT-GIGABYTE)))
    (string-join
     `(,@(if (string=? model "")
             `(,type-str)
             `(,model ,(string-append "(" type-str ")")))
       ,file-name
       ,end
       ,@(if disk-type
             `(,(disk-type-name disk-type))
             '()))
     " ")))

(define (partition-end-formatted device partition)
  "Return as a string the end of PARTITION with the relevant unit."
  (unit-format-byte
   device
   (-
    (* (+ (partition-end partition) 1)
       (device-sector-size device))
    1)))

(define (partition-print-number partition)
  "Convert the given partition NUMBER to string."
  (let ((number (partition-number partition)))
    (number->string number)))

(define (partition-description partition user-partition)
  "Return a string describing the given PARTITION, located on the DISK of
DEVICE."

  (define (partition-print-type partition)
    "Return the type of PARTITION as a string."
    (if (freespace-partition? partition)
        (G_ "Free space")
        (let ((type (partition-type partition)))
          (match type
            ((type-symbol)
             (symbol->string type-symbol))))))

  (define (partition-print-flags partition)
    "Return the flags of PARTITION as a string of comma separated flags."
    (string-join
     (filter-map
      (lambda (flag)
        (and (partition-get-flag partition flag)
             (partition-flag-get-name flag)))
      (partition-flags partition))
     ","))

  (define (maybe-string-pad string length)
    "Returned a string formatted by padding STRING of LENGTH characters to the
right. If STRING is #f use an empty string."
    (if (and string (not (string=? string "")))
        (string-pad-right string length)
        ""))

  (let* ((disk (partition-disk partition))
         (device (disk-device disk))
         (disk-type (disk-disk-type disk))
         (has-name? (disk-type-check-feature
                     disk-type
                     DISK-TYPE-FEATURE-PARTITION-NAME))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED))
         (part-type (partition-print-type partition))
         (number (and (not (freespace-partition? partition))
                      (partition-print-number partition)))
         (name (and has-name?
                    (if (freespace-partition? partition)
                        (G_ "Free space")
                        (partition-get-name partition))))
         (start (unit-format device
                             (partition-start partition)))
         (end (partition-end-formatted device partition))
         (size (unit-format device (partition-length partition)))
         (fs-type (partition-fs-type partition))
         (fs-type-name (and fs-type
                            (filesystem-type-name fs-type)))
         (crypt-label (and user-partition
                           (user-partition-crypt-label user-partition)))
         (flags (and (not (freespace-partition? partition))
                     (partition-print-flags partition)))
         (mount-point (and user-partition
                           (user-partition-mount-point user-partition))))
    `(,(or number "")
      ,@(if has-extended?
            (list part-type)
            '())
      ,size
      ,(or fs-type-name "")
      ,(or flags "")
      ,(or mount-point "")
      ,(or crypt-label "")
      ,(maybe-string-pad name 30))))

(define (partitions-descriptions partitions user-partitions)
  "Return a list of strings describing all the partitions found on
DEVICE. METADATA partitions are not described. The strings are padded to the
right so that they can be displayed as a table."

  (define (max-length-column lists column-index)
    "Return the maximum length of the string at position COLUMN-INDEX in the
list of string lists LISTS."
    (apply max
           (map (lambda (list)
                  (string-length
                   (list-ref list column-index)))
                lists)))

  (define (pad-descriptions descriptions)
    "Return a padded version of the list of string lists DESCRIPTIONS. The
strings are padded to the length of the longer string in a same column, as
determined by MAX-LENGTH-COLUMN procedure."
    (let* ((description-length (length (car descriptions)))
           (paddings (map (lambda (index)
                            (max-length-column descriptions index))
                          (iota description-length))))
      (map (lambda (description)
             (map string-pad-right description paddings))
           descriptions)))

  (let* ((descriptions
          (map
           (lambda (partition)
             (let ((user-partition
                    (find-user-partition-by-parted-object user-partitions
                                                          partition)))
               (partition-description partition user-partition)))
           partitions))
         (padded-descriptions (if (null? partitions)
                                  '()
                                  (pad-descriptions descriptions))))
    (map (cut string-join <> " ") padded-descriptions)))

(define (user-partition-description user-partition)
  "Return a string describing the given USER-PARTITION record."
  (let* ((partition (user-partition-parted-object user-partition))
         (disk (partition-disk partition))
         (disk-type (disk-disk-type disk))
         (device (disk-device disk))
         (has-name? (disk-type-check-feature
                     disk-type
                     DISK-TYPE-FEATURE-PARTITION-NAME))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED))
         (name (user-partition-name user-partition))
         (type (user-partition-type user-partition))
         (type-name (symbol->string type))
         (fs-type (user-partition-fs-type user-partition))
         (fs-type-name (user-fs-type-name fs-type))
         (bootable? (user-partition-bootable? user-partition))
         (esp? (user-partition-esp? user-partition))
         (need-formatting? (user-partition-need-formatting? user-partition))
         (crypt-label (user-partition-crypt-label user-partition))
         (size (user-partition-size user-partition))
         (mount-point (user-partition-mount-point user-partition)))
    `(,@(if has-name?
            `((name . ,(format #f (G_ "Name: ~a")
                               (or name (G_ "None")))))
            '())
      ,@(if (and has-extended?
                 (freespace-partition? partition)
                 (not (eq? type 'logical)))
            `((type . ,(format #f (G_ "Type: ~a") type-name)))
            '())
      ,@(if (eq? type 'extended)
            '()
            `((fs-type . ,(format #f (G_ "File system type: ~a")
                                  fs-type-name))))
      ,@(if (or (eq? type 'extended)
                (eq? fs-type 'swap)
                (not has-extended?))
            '()
            `((bootable . ,(format #f (G_ "Bootable flag: ~:[off~;on~]")
                                   bootable?))))
      ,@(if (and (not has-extended?)
                 (not (eq? fs-type 'swap)))
            `((esp? . ,(format #f (G_ "ESP flag: ~:[off~;on~]") esp?)))
            '())
      ,@(if (freespace-partition? partition)
            (let ((size-formatted
                   (or size (unit-format device   ;XXX: i18n
                                         (partition-length partition)))))
              `((size . ,(format #f (G_ "Size: ~a") size-formatted))))
            '())
      ,@(if (or (eq? type 'extended)
                (eq? fs-type 'swap))
            '()
            `((crypt-label
               . ,(format #f (G_ "Encryption: ~:[No~a~;Yes (label '~a')~]")
                          crypt-label (or crypt-label "")))))
      ,@(if (or (freespace-partition? partition)
                (eq? fs-type 'swap))
            '()
            `((need-formatting?
               . ,(format #f (G_ "Format the partition? ~:[No~;Yes~]")
                          need-formatting?))))
      ,@(if (or (eq? type 'extended)
                (eq? fs-type 'swap))
            '()
            `((mount-point
               . ,(format #f (G_ "Mount point: ~a")
                          (or mount-point
                              (and esp? (default-esp-mount-point))
                              (G_ "None")))))))))


;;
;; Partition table creation.
;;

(define (mklabel device type-name)
  "Create a partition table on DEVICE. TYPE-NAME is the type of the partition
table, \"msdos\" or \"gpt\"."
  (let ((type (disk-type-get type-name)))
    (disk-new-fresh device type)))


;;
;; Partition creation.
;;

;; The maximum count of primary partitions is exceeded.
(define-condition-type &max-primary-exceeded &condition
  max-primary-exceeded?)

;; It is not possible to create an extended partition.
(define-condition-type &extended-creation-error &condition
  extended-creation-error?)

;; It is not possible to create a logical partition.
(define-condition-type &logical-creation-error &condition
  logical-creation-error?)

(define (can-create-primary? disk)
  "Return #t if it is possible to create a primary partition on DISK, return
#f otherwise."
  (let ((max-primary (disk-get-max-primary-partition-count disk)))
    (find (lambda (number)
            (not (disk-get-partition disk number)))
          (iota max-primary 1))))

(define (can-create-extended? disk)
  "Return #t if it is possible to create an extended partition on DISK, return
#f otherwise."
  (let* ((disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED)))
    (and (can-create-primary? disk)
         has-extended?
         (not (disk-extended-partition disk)))))

(define (can-create-logical? disk)
  "Return #t is it is possible to create a logical partition on DISK, return
#f otherwise."
  (let* ((disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED)))
    (and has-extended?
         (disk-extended-partition disk))))

(define (can-create-partition? user-part)
  "Return #t if it is possible to create the given USER-PART record, return #f
otherwise."
  (let* ((type (user-partition-type user-part))
         (partition (user-partition-parted-object user-part))
         (disk (partition-disk partition)))
    (case type
      ((normal)
       (or (can-create-primary? disk)
           (raise
            (condition (&max-primary-exceeded)))))
      ((extended)
       (or (can-create-extended? disk)
           (raise
            (condition (&extended-creation-error)))))
      ((logical)
       (or (can-create-logical? disk)
           (raise
            (condition (&logical-creation-error))))))))

(define* (mkpart disk user-partition
                 #:key (previous-partition #f))
  "Create the given USER-PARTITION on DISK. The PREVIOUS-PARTITION argument as
to be set to the partition preceding USER-PARTITION if any."

  (define (parse-start-end start end)
    "Parse start and end strings as positions on DEVICE expressed with a unit,
like '100GB' or '12.2KiB'. Return a list of 4 elements, the start sector, its
range (1 unit large area centered on start sector), the end sector and its
range."
    (let ((device (disk-device disk)))
      (call-with-values
          (lambda ()
            (unit-parse start device))
        (lambda (start-sector start-range)
          (call-with-values
              (lambda ()
                (unit-parse end device))
            (lambda (end-sector end-range)
              (list start-sector start-range
                    end-sector end-range)))))))

  (define* (extend-ranges! start-range end-range
                           #:key (offset 0))
    "Try to extend START-RANGE by 1 MEBIBYTE to the right and END-RANGE by 1
MEBIBYTE to the left. This way, if the disk is aligned on 2048 sectors of
512KB (like frequently), we will have a chance for the
'optimal-align-constraint' to succeed. Do not extend ranges if that would
cause them to cross."
    (let* ((device (disk-device disk))
           (start-range-end (geometry-end start-range))
           (end-range-start (geometry-start end-range))
           (mebibyte-sector-size (/ MEBIBYTE-SIZE
                                    (device-sector-size device)))
           (new-start-range-end
            (+ start-range-end mebibyte-sector-size offset))
           (new-end-range-start
            (- end-range-start mebibyte-sector-size offset)))
      (when (< new-start-range-end new-end-range-start)
        (geometry-set-end start-range new-start-range-end)
        (geometry-set-start end-range new-end-range-start))))

  (match (parse-start-end (user-partition-start user-partition)
                          (user-partition-end user-partition))
    ((start-sector start-range end-sector end-range)
     (let* ((prev-end (if previous-partition
                          (partition-end previous-partition)
                          0))
            (start-distance (- start-sector prev-end))
            (type (user-partition-type user-partition))
            ;; There should be at least 2 unallocated sectors in front of each
            ;; logical partition, otherwise parted will fail badly:
            ;; https://gparted.org/h2-fix-msdos-pt.php#apply-action-fail.
            (start-offset (if previous-partition
                              (- 3 start-distance)
                              0))
            (start-sector* (if (and (eq? type 'logical)
                                    (< start-distance 3))
                               (+ start-sector start-offset)
                               start-sector)))
       ;; This is a hack.  Parted almost always fails to create optimally
       ;; aligned partitions (unless specifying percentages) because the
       ;; default range of 1MB centered on the start sector is not enough when
       ;; the optimal alignment is 2048 sectors of 512KB.
       (extend-ranges! start-range end-range #:offset start-offset)

       (let* ((device (disk-device disk))
              (disk-type (disk-disk-type disk))
              (length (device-length device))
              (name (user-partition-name user-partition))
              (filesystem-type
               (filesystem-type-get
                (user-fs-type-name
                 (user-partition-fs-type user-partition))))
              (flags `(,@(if (user-partition-bootable? user-partition)
                             `(,PARTITION-FLAG-BOOT)
                             '())
                       ,@(if (user-partition-esp? user-partition)
                             `(,PARTITION-FLAG-ESP)
                             '())
                       ,@(if (user-partition-bios-grub? user-partition)
                             `(,PARTITION-FLAG-BIOS-GRUB)
                             '())))
              (has-name? (disk-type-check-feature
                          disk-type
                          DISK-TYPE-FEATURE-PARTITION-NAME))
              (partition-type (partition-type->int type))
              (partition (partition-new disk
                                        #:type partition-type
                                        #:filesystem-type filesystem-type
                                        #:start start-sector*
                                        #:end end-sector))
              (user-constraint (constraint-new
                                #:start-align 'any
                                #:end-align 'any
                                #:start-range start-range
                                #:end-range end-range
                                #:min-size 1
                                #:max-size length))
              (dev-constraint
               (device-get-optimal-aligned-constraint device))
              (final-constraint (constraint-intersect user-constraint
                                                      dev-constraint))
              (no-constraint (constraint-any device))
              ;; Try to create a partition with an optimal alignment
              ;; constraint. If it fails, fallback to creating a partition
              ;; with no specific constraint.
              (partition-constraint-ok?
               (disk-add-partition disk partition final-constraint))
              (partition-no-contraint-ok?
               (or partition-constraint-ok?
                   (disk-add-partition disk partition no-constraint)))
              (partition-ok?
               (or partition-constraint-ok? partition-no-contraint-ok?)))
         (syslog "Creating partition:
~/type: ~a
~/filesystem-type: ~a
~/start: ~a
~/end: ~a
~/start-range: [~a, ~a]
~/end-range: [~a, ~a]
~/constraint: ~a
~/no-constraint: ~a
"
                 partition-type
                 (filesystem-type-name filesystem-type)
                 start-sector*
                 end-sector
                 (geometry-start start-range) (geometry-end start-range)
                 (geometry-start end-range) (geometry-end end-range)
                 partition-constraint-ok?
                 partition-no-contraint-ok?)
         ;; Set the partition name if supported.
         (when (and partition-ok? has-name? name)
           (partition-set-name partition name))

         ;; Set flags is required.
         (for-each (lambda (flag)
                     (and (partition-is-flag-available? partition flag)
                          (partition-set-flag partition flag 1)))
                   flags)

         (and partition-ok?
              (partition-set-system partition filesystem-type)
              partition))))))


;;
;; Partition destruction.
;;

(define (rmpart disk number)
  "Remove the partition with the given NUMBER on DISK."
  (let ((partition (disk-get-partition disk number)))
    (disk-remove-partition* disk partition)))


;;
;; Auto partitionning.
;;

(define* (create-adjacent-partitions! disk partitions
                                      #:key (last-partition-end 0))
  "Create the given PARTITIONS on DISK. LAST-PARTITION-END is the sector from
which we want to start creating partitions. The START and END of each created
partition are computed from its SIZE value and the position of the last
partition."
  (let ((device (disk-device disk)))
    (let loop ((partitions partitions)
               (remaining-space (- (device-length device)
                                   last-partition-end))
               (start last-partition-end))
      (match partitions
        (() '())
        ((partition . rest)
         (let* ((size (user-partition-size partition))
                (percentage-size (and (string? size)
                                      (read-percentage size)))
                (sector-size (device-sector-size device))
                (partition-size (if percentage-size
                                    (exact->inexact
                                     (* (/ percentage-size 100)
                                        remaining-space))
                                    size))
                (end-partition (min (- (device-length device) 1)
                                    (nearest-exact-integer
                                     (+ start partition-size 1))))
                (name (user-partition-name partition))
                (type (user-partition-type partition))
                (fs-type (user-partition-fs-type partition))
                (start-formatted (unit-format-custom device
                                                     start
                                                     UNIT-SECTOR))
                (end-formatted (unit-format-custom device
                                                   end-partition
                                                   UNIT-SECTOR))
                (new-user-partition (user-partition
                                     (inherit partition)
                                     (start start-formatted)
                                     (end end-formatted)))
                (new-partition
                 (mkpart disk new-user-partition)))
           (if new-partition
               (cons (user-partition
                      (inherit new-user-partition)
                      (file-name (partition-get-path new-partition))
                      (disk-file-name (device-path device))
                      (parted-object new-partition))
                     (loop rest
                           (if (eq? type 'extended)
                               remaining-space
                               (- remaining-space
                                  (partition-length new-partition)))
                           (if (eq? type 'extended)
                               (+ start 1)
                               (+ (partition-end new-partition) 1))))
               (error
                (format #f "Unable to create partition ~a~%" name)))))))))

(define (force-user-partitions-formatting user-partitions)
  "Set the NEED-FORMATING? fields to #t on all <user-partition> records of
USER-PARTITIONS list and return the updated list."
  (map (lambda (p)
         (user-partition
          (inherit p)
          (need-formatting? #t)))
       user-partitions))

(define* (auto-partition! disk
                          #:key
                          (scheme 'entire-root))
  "Automatically create partitions on DISK. All the previous
partitions (except the ESP on a GPT disk, if present) are wiped. SCHEME is the
desired partitioning scheme. It can be 'entire-root or
'entire-root-home. 'entire-root will create a swap partition and a root
partition occupying all the remaining space. 'entire-root-home will create a
swap partition, a root partition and a home partition.

Return the complete list of partitions on DISK, including the ESP when it
exists."
  (let* ((device (disk-device disk))
         (disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED))
         (partitions (filter data-partition? (disk-partitions disk)))
         (esp-partition (find-esp-partition partitions))
         ;; According to
         ;; https://wiki.archlinux.org/index.php/EFI_system_partition, the ESP
         ;; size should be at least 550MiB.
         (new-esp-size (nearest-exact-integer
                        (/ (* 550 MEBIBYTE-SIZE)
                           (device-sector-size device))))
         (end-esp-partition (and esp-partition
                                 (partition-end esp-partition)))
         (non-boot-partitions (remove esp-partition? partitions))
         (bios-grub-size (/ (* 3 MEBIBYTE-SIZE)
                            (device-sector-size device)))
         (five-percent-disk (nearest-exact-integer
                             (* 0.05 (device-length device))))
         (default-swap-size (nearest-exact-integer
                             (/ (* 4 GIGABYTE-SIZE)
                                (device-sector-size device))))
         ;; Use a 4GB size for the swap if it represents less than 5% of the
         ;; disk space. Otherwise, set the swap size to 5% of the disk space.
         (swap-size (min default-swap-size five-percent-disk)))

    ;; Remove everything but esp if it exists.
    (for-each
     (lambda (partition)
       (and (data-partition? partition)
            (disk-remove-partition* disk partition)))
     non-boot-partitions)

    (let* ((start-partition
            (if (efi-installation?)
                (and (not esp-partition)
                     (user-partition
                      (fs-type 'fat32)
                      (esp? #t)
                      (size new-esp-size)
                      (mount-point (default-esp-mount-point))))
                (user-partition
                 (fs-type 'ext4)
                 (bootable? #t)
                 (bios-grub? #t)
                 (size bios-grub-size))))
           (new-partitions
            (cond
             ((or (eq? scheme 'entire-root)
                  (eq? scheme 'entire-encrypted-root))
              (let ((encrypted? (eq? scheme 'entire-encrypted-root)))
                `(,@(if start-partition
                        `(,start-partition)
                        '())
                  ,@(if encrypted?
                        '()
                        `(,(user-partition
                            (fs-type 'swap)
                            (size swap-size))))
                  ,(user-partition
                    (fs-type 'ext4)
                    (bootable? has-extended?)
                    (crypt-label (and encrypted? "cryptroot"))
                    (size "100%")
                    (mount-point "/")))))
             ((or (eq? scheme 'entire-root-home)
                  (eq? scheme 'entire-encrypted-root-home))
              (let ((encrypted? (eq? scheme 'entire-encrypted-root-home)))
                `(,@(if start-partition
                        `(,start-partition)
                        '())
                  ,(user-partition
                    (fs-type 'ext4)
                    (bootable? has-extended?)
                    (crypt-label (and encrypted? "cryptroot"))
                    (size "33%")
                    (mount-point "/"))
                  ,@(if has-extended?
                        `(,(user-partition
                            (type 'extended)
                            (size "100%")))
                        '())
                  ,@(if encrypted?
                        '()
                        `(,(user-partition
                            (type (if has-extended?
                                      'logical
                                      'normal))
                            (fs-type 'swap)
                            (size swap-size))))
                  ,(user-partition
                    (type (if has-extended?
                              'logical
                              'normal))
                    (fs-type 'ext4)
                    (crypt-label (and encrypted? "crypthome"))
                    (size "100%")
                    (mount-point "/home")))))))
           (new-partitions* (force-user-partitions-formatting
                             new-partitions)))
      (append (if esp-partition
                  (list (partition->user-partition esp-partition))
                  '())
              (create-adjacent-partitions! disk
                                           new-partitions*
                                           #:last-partition-end
                                           (or end-esp-partition 0))))))


;;
;; Convert user-partitions.
;;

;; No root mount point found.
(define-condition-type &no-root-mount-point &condition
  no-root-mount-point?)

;; Cannot not read the partition UUID.
(define-condition-type &cannot-read-uuid &condition
  cannot-read-uuid?
  (partition cannot-read-uuid-partition))

(define (check-user-partitions user-partitions)
  "Check the following statements:

The USER-PARTITIONS list contains one <user-partition> record with a
mount-point set to '/'.  Raise &no-root-mount-point condition otherwise.

All the USER-PARTITIONS with a mount point and that will not be formatted have
a valid UUID.  Raise a &cannot-read-uuid condition specifying the faulty
partition otherwise.

Return #t if all the statements are valid."
  (define (check-root)
    (let ((mount-points
           (map user-partition-mount-point user-partitions)))
      (or (member "/" mount-points)
          (raise
           (condition (&no-root-mount-point))))))

  (define (check-uuid)
    (let ((mount-partitions
           (filter user-partition-mount-point user-partitions)))
      (every
       (lambda (user-partition)
         (let ((file-name (user-partition-file-name user-partition))
               (need-formatting?
                (user-partition-need-formatting? user-partition)))
           (or need-formatting?
               (read-partition-uuid file-name)
               (raise
                (condition
                 (&cannot-read-uuid
                  (partition file-name)))))))
       mount-partitions)))

  (and (check-root)
       (check-uuid)
       #t))

(define (set-user-partitions-file-name user-partitions)
  "Set the partition file-name of <user-partition> records in USER-PARTITIONS
list and return the updated list."
  (map (lambda (p)
         (let* ((partition (user-partition-parted-object p))
                (file-name (partition-get-path partition)))
           (user-partition
            (inherit p)
            (file-name file-name))))
       user-partitions))

(define-syntax-rule (with-null-output-ports exp ...)
  "Evaluate EXP with both the output port and the error port pointing to the
bit bucket."
  (with-output-to-port (%make-void-port "w")
    (lambda ()
      (with-error-to-port (%make-void-port "w")
        (lambda () exp ...)))))

(define (create-btrfs-file-system partition)
  "Create a btrfs file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.btrfs" "-f" partition)))

(define (create-ext4-file-system partition)
  "Create an ext4 file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.ext4" "-F" partition)))

(define (create-fat16-file-system partition)
  "Create a fat16 file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.fat" "-F16" partition)))

(define (create-fat32-file-system partition)
  "Create a fat32 file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.fat" "-F32" partition)))

(define (create-jfs-file-system partition)
  "Create a JFS file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "jfs_mkfs" "-f" partition)))

(define (create-ntfs-file-system partition)
  "Create a JFS file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.ntfs" "-F" "-f" partition)))

(define (create-xfs-file-system partition)
  "Create an XFS file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.xfs" "-f" partition)))

(define (create-swap-partition partition)
  "Set up swap area on PARTITION file-name."
  (with-null-output-ports
   (invoke "mkswap" "-f" partition)))

(define (call-with-luks-key-file password proc)
  "Write PASSWORD in a temporary file and pass it to PROC as argument."
  (call-with-temporary-output-file
   (lambda (file port)
     (put-string port password)
     (close port)
     (proc file))))

(define (user-partition-upper-file-name user-partition)
  "Return the file-name of the virtual block device corresponding to
USER-PARTITION if it is encrypted, or the plain file-name otherwise."
  (let ((crypt-label (user-partition-crypt-label user-partition))
        (file-name (user-partition-file-name user-partition)))
    (if crypt-label
        (string-append "/dev/mapper/" crypt-label)
        file-name)))

(define (luks-format-and-open user-partition)
  "Format and open the encrypted partition pointed by USER-PARTITION."
  (let* ((file-name (user-partition-file-name user-partition))
         (label (user-partition-crypt-label user-partition))
         (password (user-partition-crypt-password user-partition)))
    (call-with-luks-key-file
     password
     (lambda (key-file)
       (syslog "formatting and opening LUKS entry ~s at ~s~%"
               label file-name)
       (system* "cryptsetup" "-q" "luksFormat" file-name key-file)
       (system* "cryptsetup" "open" "--type" "luks"
                "--key-file" key-file file-name label)))))

(define (luks-close user-partition)
  "Close the encrypted partition pointed by USER-PARTITION."
  (let ((label (user-partition-crypt-label user-partition)))
    (syslog "closing LUKS entry ~s~%" label)
    (system* "cryptsetup" "close" label)))

(define (format-user-partitions user-partitions)
  "Format the <user-partition> records in USER-PARTITIONS list with
NEED-FORMATING? field set to #t."
  (for-each
   (lambda (user-partition)
     (let* ((need-formatting?
             (user-partition-need-formatting? user-partition))
            (type (user-partition-type user-partition))
            (crypt-label (user-partition-crypt-label user-partition))
            (file-name (user-partition-upper-file-name user-partition))
            (fs-type (user-partition-fs-type user-partition)))
       (when crypt-label
         (luks-format-and-open user-partition))

       (case fs-type
         ((btrfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-btrfs-file-system file-name)))
         ((ext4)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-ext4-file-system file-name)))
         ((fat16)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-fat16-file-system file-name)))
         ((fat32)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-fat32-file-system file-name)))
         ((jfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-jfs-file-system file-name)))
         ((ntfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-ntfs-file-system file-name)))
         ((xfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-xfs-file-system file-name)))
         ((swap)
          (create-swap-partition file-name))
         (else
          ;; TODO: Add support for other file-system types.
          #t))))
   user-partitions))

(define (sort-partitions user-partitions)
  "Sort USER-PARTITIONS by mount-points, so that the more nested mount-point
comes last. This is useful to mount/umount partitions in a coherent order."
  (sort user-partitions
        (lambda (a b)
          (let ((mount-point-a (user-partition-mount-point a))
                (mount-point-b (user-partition-mount-point b)))
            (string-prefix? mount-point-a mount-point-b)))))

(define (mount-user-partitions user-partitions)
  "Mount the <user-partition> records in USER-PARTITIONS list on their
respective mount-points."
  (let* ((mount-partitions (filter user-partition-mount-point user-partitions))
         (sorted-partitions (sort-partitions mount-partitions)))
    (for-each (lambda (user-partition)
                (let* ((mount-point
                        (user-partition-mount-point user-partition))
                       (target
                        (string-append (%installer-target-dir)
                                       mount-point))
                       (fs-type
                        (user-partition-fs-type user-partition))
                       (crypt-label
                        (user-partition-crypt-label user-partition))
                       (mount-type
                        (user-fs-type->mount-type fs-type))
                       (file-name
                        (user-partition-upper-file-name user-partition)))
                  (mkdir-p target)
                  (syslog "mounting ~s on ~s~%" file-name target)
                  (mount file-name target mount-type)))
              sorted-partitions)))

(define (umount-user-partitions user-partitions)
  "Unmount all the <user-partition> records in USER-PARTITIONS list."
  (let* ((mount-partitions (filter user-partition-mount-point user-partitions))
         (sorted-partitions (sort-partitions mount-partitions)))
    (for-each (lambda (user-partition)
                (let* ((mount-point
                        (user-partition-mount-point user-partition))
                       (crypt-label
                        (user-partition-crypt-label user-partition))
                       (target
                        (string-append (%installer-target-dir)
                                       mount-point)))
                  (syslog "unmounting ~s~%" target)
                  (umount target)
                  (when crypt-label
                    (luks-close user-partition))))
              (reverse sorted-partitions))))

(define (find-swap-user-partitions user-partitions)
  "Return the subset of <user-partition> records in USER-PARTITIONS list with
the FS-TYPE field set to 'swap, return the empty list if none found."
  (filter (lambda (user-partition)
            (let ((fs-type (user-partition-fs-type user-partition)))
              (eq? fs-type 'swap)))
          user-partitions))

(define (start-swapping user-partitions)
  "Start swapping on <user-partition> records with FS-TYPE equal to 'swap."
  (let* ((swap-user-partitions (find-swap-user-partitions user-partitions))
         (swap-devices (map user-partition-file-name swap-user-partitions)))
    (for-each swapon swap-devices)))

(define (stop-swapping user-partitions)
  "Stop swapping on <user-partition> records with FS-TYPE equal to 'swap."
  (let* ((swap-user-partitions (find-swap-user-partitions user-partitions))
         (swap-devices (map user-partition-file-name swap-user-partitions)))
    (for-each swapoff swap-devices)))

(define-syntax-rule (with-mounted-partitions user-partitions exp ...)
  "Mount USER-PARTITIONS and start swapping within the dynamic extent of EXP."
  (dynamic-wind
    (lambda ()
      (mount-user-partitions user-partitions)
      (start-swapping user-partitions))
    (lambda ()
      exp ...)
    (lambda ()
      (umount-user-partitions user-partitions)
      (stop-swapping user-partitions)
      #f)))

(define (user-partition->file-system user-partition)
  "Convert the given USER-PARTITION record in a FILE-SYSTEM record from
(gnu system file-systems) module and return it."
  (let* ((mount-point (user-partition-mount-point user-partition))
         (fs-type (user-partition-fs-type user-partition))
         (crypt-label (user-partition-crypt-label user-partition))
         (mount-type (user-fs-type->mount-type fs-type))
         (file-name (user-partition-file-name user-partition))
         (upper-file-name (user-partition-upper-file-name user-partition))
         ;; Only compute uuid if partition is not encrypted.
         (uuid (or crypt-label
                   (uuid->string (read-partition-uuid file-name) fs-type))))
    `(file-system
       (mount-point ,mount-point)
       (device ,@(if crypt-label
                     `(,upper-file-name)
                     `((uuid ,uuid (quote ,fs-type)))))
       (type ,mount-type)
       ,@(if crypt-label
             '((dependencies mapped-devices))
             '()))))

(define (user-partitions->file-systems user-partitions)
  "Convert the given USER-PARTITIONS list of <user-partition> records into a
list of <file-system> records."
  (filter-map
   (lambda (user-partition)
     (let ((mount-point
            (user-partition-mount-point user-partition)))
       (and mount-point
            (user-partition->file-system user-partition))))
   user-partitions))

(define (user-partition->mapped-device user-partition)
  "Convert the given USER-PARTITION record into a MAPPED-DEVICE record
from (gnu system mapped-devices) and return it."
  (let ((label (user-partition-crypt-label user-partition))
        (file-name (user-partition-file-name user-partition)))
    `(mapped-device
      (source (uuid ,(uuid->string
                      (read-luks-partition-uuid file-name)
                      'luks)))
      (target ,label)
      (type luks-device-mapping))))

(define (root-user-partition? partition)
  "Return true if PARTITION is the root partition."
  (let ((mount-point (user-partition-mount-point partition)))
    (and mount-point
         (string=? mount-point "/"))))

(define (bootloader-configuration user-partitions)
  "Return the bootloader configuration field for USER-PARTITIONS."
  (let* ((root-partition (find root-user-partition?
                               user-partitions))
         (root-partition-disk (user-partition-disk-file-name root-partition)))
    `((bootloader-configuration
       ,@(if (efi-installation?)
             `((bootloader grub-efi-bootloader)
               (targets (list ,(default-esp-mount-point))))
             `((bootloader grub-bootloader)
               (targets (list ,root-partition-disk))))

       ;; XXX: Assume we defined the 'keyboard-layout' field of
       ;; <operating-system> right above.
       (keyboard-layout keyboard-layout)))))

(define (user-partition-missing-modules user-partitions)
  "Return the list of kernel modules missing from the default set of kernel
modules to access USER-PARTITIONS."
  (let ((devices (filter user-partition-crypt-label user-partitions))
        (root    (find root-user-partition? user-partitions)))
    (delete-duplicates
     (append-map (lambda (device)
                   (catch 'system-error
                     (lambda ()
                       (missing-modules device %base-initrd-modules))
                     (const '())))
                 (delete-duplicates
                  (map user-partition-file-name
                       (cons root devices)))))))

(define (initrd-configuration user-partitions)
  "Return an 'initrd-modules' field with everything needed for
USER-PARTITIONS, or return nothing."
  (match (user-partition-missing-modules user-partitions)
    (()
     '())
    ((modules ...)
     `((initrd-modules (append ',modules
                               %base-initrd-modules))))))

(define (user-partitions->configuration user-partitions)
  "Return the configuration field for USER-PARTITIONS."
  (let* ((swap-user-partitions (find-swap-user-partitions user-partitions))
         (swap-devices (map user-partition-file-name swap-user-partitions))
         (encrypted-partitions
          (filter user-partition-crypt-label user-partitions)))
    `((bootloader ,@(bootloader-configuration user-partitions))
      ,@(initrd-configuration user-partitions)
      ,@(if (null? swap-devices)
            '()
            (let* ((uuids (map (lambda (file)
                                 (uuid->string (read-partition-uuid file)))
                               swap-devices)))
              `((swap-devices (list ,@(map (lambda (uuid)
                                             `(uuid ,uuid))
                                           uuids))))))
      ,@(if (null? encrypted-partitions)
            '()
            `((mapped-devices
               (list ,@(map user-partition->mapped-device
                            encrypted-partitions)))))
      (file-systems (cons*
                     ,@(user-partitions->file-systems user-partitions)
                     %base-file-systems)))))


;;
;; Initialization.
;;

(define (init-parted)
  "Initialize libparted support."
  (probe-all-devices!)
  ;; Remove all logical devices, otherwise "device-is-busy?" will report true
  ;; on all devices containaing active logical volumes.
  (remove-logical-devices)
  (exception-set-handler (lambda (exception)
                           EXCEPTION-OPTION-UNHANDLED)))

(define (free-parted devices)
  "Deallocate memory used for DEVICES in parted, force sync them and wait for
the devices not to be used before returning."
  ;; XXX: Formatting and further operations on disk partition table may fail
  ;; because the partition table changes are not synced, or because the device
  ;; is still in use, even if parted should have finished editing
  ;; partitions. This is not well understood, but syncing devices and waiting
  ;; them to stop returning EBUSY to BLKRRPART ioctl seems to be enough. The
  ;; same kind of issue is described here:
  ;; https://mail.gnome.org/archives/commits-list/2013-March/msg18423.html.
  (let ((device-file-names (map device-path devices)))
    (for-each force-device-sync devices)
    (for-each (lambda (file-name)
                (let/time ((time in-use?
                                 (with-delay-device-in-use? file-name)))
                  (if in-use?
                      (error
                       (format #f (G_ "Device ~a is still in use.")
                               file-name))
                      (syslog "Syncing ~a took ~a seconds.~%"
                              file-name (time-second time)))))
              device-file-names)))