aboutsummaryrefslogtreecommitdiff
path: root/guix-data-service/jobs/load-new-guix-revision.scm
blob: cc927d8faf8b6c46080b1fe52fdbd3dfc152c2f9 (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
;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program.  If not, see
;;; <http://www.gnu.org/licenses/>.

(define-module (guix-data-service jobs load-new-guix-revision)
  #:use-module (srfi srfi-1)
  #:use-module (ice-9 match)
  #:use-module (ice-9 hash-table)
  #:use-module (rnrs exceptions)
  #:use-module (json)
  #:use-module (squee)
  #:use-module (guix monads)
  #:use-module (guix store)
  #:use-module (guix channels)
  #:use-module (guix inferior)
  #:use-module (guix profiles)
  #:use-module (guix utils)
  #:use-module (guix progress)
  #:use-module (guix packages)
  #:use-module (guix derivations)
  #:use-module (guix build utils)
  #:use-module (guix-data-service config)
  #:use-module (guix-data-service database)
  #:use-module (guix-data-service model build)
  #:use-module (guix-data-service model channel-news)
  #:use-module (guix-data-service model package)
  #:use-module (guix-data-service model package-derivation-by-guix-revision-range)
  #:use-module (guix-data-service model git-repository)
  #:use-module (guix-data-service model guix-revision)
  #:use-module (guix-data-service model package-derivation)
  #:use-module (guix-data-service model guix-revision-package-derivation)
  #:use-module (guix-data-service model license-set)
  #:use-module (guix-data-service model lint-checker)
  #:use-module (guix-data-service model lint-warning)
  #:use-module (guix-data-service model lint-warning-message)
  #:use-module (guix-data-service model location)
  #:use-module (guix-data-service model package-metadata)
  #:use-module (guix-data-service model derivation)
  #:use-module (guix-data-service model system-test)
  #:export (log-for-job
            count-log-parts
            combine-log-parts!
            fetch-unlocked-jobs
            process-load-new-guix-revision-job
            select-job-for-commit
            select-jobs-and-events
            select-recent-job-events
            select-unprocessed-jobs-and-events
            select-jobs-and-events-for-commit
            record-job-event
            enqueue-load-new-guix-revision-job
            most-recent-n-load-new-guix-revision-jobs))

(define (log-port job-id conn)
  (define output-port
    (current-output-port))

  (define id 0)
  (define buffer "")

  (define (insert job_id s)
    (exec-query
     conn
     (string-append
      "INSERT INTO load_new_guix_revision_job_log_parts (id, job_id, contents) "
      "VALUES ($1, $2, $3)")
     (list (number->string id) job_id s)))

  (define (log-string s)
    (if (string-contains s "\n")
        (let ((output (string-append buffer s)))
          (set! id (+ 1 id)) ; increment id
          (set! buffer "") ; clear the buffer
          (insert job-id output)
          (display output output-port))
        (set! buffer (string-append buffer s))))

  ;; TODO, this is useful when re-running jobs, but I'm not sure that should
  ;; be a thing, jobs should probably be only attempted once.
  (exec-query
   conn
   "DELETE FROM load_new_guix_revision_job_log_parts WHERE job_id = $1"
   (list job-id))

  (let ((port
         (make-soft-port
          (vector (lambda (c)
                    (set! buffer (string-append buffer (string c))))
                  log-string
                  (lambda ()
                    (force-output output-port))
                  #f ; fetch one character
                  (lambda ()
                    ;; close port
                    #f)
                  #f) ; number of characters that can be read
          "w")))
    (setvbuf port 'line)
    port))

(define real-error-port
  (make-parameter (current-error-port)))

(define* (log-for-job conn job-id
                      #:key
                      character-limit
                      start-character)
  (define (sql-html-escape s)
    (string-append
     "replace("
     (string-append
      "replace("
      (string-append
       "replace("
       s
       ",'&','&amp;')")
      ",'<','&lt;')")
     ",'>','&gt;')"))

  (define (get-characters s)
    (if start-character
        (simple-format #f "substr(~A, ~A, ~A)"
                       s start-character
                       character-limit)
        (simple-format #f "right(~A, ~A)" s character-limit)))

  (define log-query
    (string-append
     "SELECT "
     (sql-html-escape (get-characters "contents"))
     " FROM load_new_guix_revision_job_logs"
     " WHERE job_id = $1 AND contents IS NOT NULL"))

  (define parts-query
    (string-append
     "SELECT "
     (sql-html-escape
      (get-characters "STRING_AGG(contents, '' ORDER BY id ASC)"))
     " FROM load_new_guix_revision_job_log_parts WHERE job_id = $1"))

  (match (exec-query conn log-query (list job-id))
    (((contents))
     contents)
    (()
     (match (exec-query conn parts-query (list job-id))
       (((contents))
        contents)))))

(define (insert-empty-log-entry conn job-id)
  (exec-query
   conn
   "DELETE FROM load_new_guix_revision_job_logs WHERE job_id = $1"
   (list job-id))
  (exec-query
   conn
   "INSERT INTO load_new_guix_revision_job_logs (job_id, contents) VALUES
($1, NULL)"
   (list job-id)))

(define (count-log-parts conn job-id)
  (match (exec-query
          conn
          "
SELECT COUNT(*)
FROM load_new_guix_revision_job_log_parts
WHERE job_id = $1"
          (list job-id))
    (((id))
     (string->number id))))

(define (combine-log-parts! conn job-id)
  (with-postgresql-transaction
   conn
   (lambda (conn)
     (exec-query
      conn
      (string-append
       "UPDATE load_new_guix_revision_job_logs SET contents = "
       "("
       "SELECT STRING_AGG(contents, '' ORDER BY id ASC) FROM "
       "load_new_guix_revision_job_log_parts WHERE job_id = $1 "
       "GROUP BY job_id"
       ")"
       "WHERE job_id = $1")
      (list job-id))
     (exec-query
      conn
      "DELETE FROM load_new_guix_revision_job_log_parts WHERE job_id = $1"
      (list job-id)))))

(define inferior-package-id
  (@@ (guix inferior) inferior-package-id))

(define (log-time action f)
  (simple-format #t "debug: Starting ~A\n" action)
  (let* ((start-time (current-time))
         (result (f))
         (time-taken (- (current-time) start-time)))
    (simple-format #t "debug: Finished ~A, took ~A seconds\n"
                   action time-taken)
    result))

(define (record-start-time action)
  (simple-format #t "debug: Starting ~A\n" action)
  (cons action
        (current-time)))

(define record-end-time
  (match-lambda
    ((action . start-time)
     (let ((time-taken (- (current-time) start-time)))
       (simple-format #t "debug: Finished ~A, took ~A seconds\n"
                      action time-taken)))))

(define (with-advisory-session-lock/log-time conn lock f)
  (simple-format #t "debug: Acquiring advisory session lock: ~A\n" lock)
  (let ((start-time (current-time)))
    (with-advisory-session-lock
     conn
     lock
     (lambda ()
       (let ((time-taken (- (current-time) start-time)))
         (simple-format #t "debug: Finished aquiring lock ~A, took ~A seconds\n"
                        lock time-taken))
       (f)))))

(define (all-inferior-system-tests inf store)
  (define extract
    '(lambda (store)
       (map
        (lambda (system-test)
          (list (system-test-name system-test)
                (system-test-description system-test)
                (derivation-file-name
                 (run-with-store store
                   (mbegin %store-monad
                     (system-test-value system-test))))
                (match (system-test-location system-test)
                  (($ <location> file line column)
                   (list file
                         line
                         column)))))
        (all-system-tests))))

  (let ((system-test-data
         (log-time
          "getting system tests"
          (lambda ()
            (inferior-eval-with-store inf store extract)))))

    (for-each (lambda (derivation-file-name)
                (add-temp-root store derivation-file-name))
              (map third system-test-data))

    system-test-data))

(define (all-inferior-lint-warnings inf store)
  (define locales
    '("cs_CZ.utf8"
      "da_DK.utf8"
      "de_DE.utf8"
      "eo_EO.utf8"
      "es_ES.utf8"
      "fr_FR.utf8"
      "hu_HU.utf8"
      "pl_PL.utf8"
      "pt_BR.utf8"
      ;;"sr_SR.utf8"
      "sv_SE.utf8"
      "vi_VN.utf8"
      "zh_CN.utf8"))

  (define (lint-warnings-for-checker checker-name)
    `(lambda (store)
       (let* ((checker (find (lambda (checker)
                               (eq? (lint-checker-name checker)
                                    ',checker-name))
                             %local-checkers))
              (check (lint-checker-check checker)))

         (define (process-lint-warning lint-warning)
           (list
            (match (lint-warning-location lint-warning)
              (($ <location> file line column)
               (list (if (string-prefix? "/gnu/store/" file)
                         ;; Convert a string like
                         ;; /gnu/store/53xh0mpigin2rffg31s52x5dc08y0qmr-guix-module-union/share/guile/site/2.2/gnu/packages/xdisorg.scm
                         ;;
                         ;; This happens when the checker uses
                         ;; package-field-location.
                         (string-join (drop (string-split file #\/) 8) "/")
                         file)
                     line
                     column)))
            (let* ((source-locale "en_US.utf8")
                   (source-message
                    (begin
                      (setlocale LC_MESSAGES source-locale)
                      (lint-warning-message lint-warning)))
                   (messages-by-locale
                    (filter-map
                     (lambda (locale)
                       (catch 'system-error
                         (lambda ()
                           (setlocale LC_MESSAGES locale))
                         (lambda (key . args)
                           (error
                            (simple-format
                             #f
                             "error changing locale to ~A: ~A ~A"
                             locale key args))))
                       (let ((message
                              (lint-warning-message lint-warning)))
                         (setlocale LC_MESSAGES source-locale)
                         (if (string=? message source-message)
                             #f
                             (cons locale message))))
                     (list ,@locales))))
              (cons (cons source-locale source-message)
                    messages-by-locale))))

         (filter
          (match-lambda
            ((package-id . warnings)
             (not (null? warnings))))
          (hash-map->list
           (lambda (package-id package)
             (cons
              package-id
              (map process-lint-warning
                   (check package))))
           %package-table)))))

  (and
   (catch
     'misc-error
     (lambda ()
       (inferior-eval '(use-modules (guix lint)) inf)
       #t)
     (lambda (key . args)
       (simple-format (current-error-port)
                      "warning: failed to load the (guix lint) module: ~A ~A\n"
                      key args)
       #f))
   (let ((checkers
          (inferior-eval
           '(begin
              (map (lambda (checker)
                     (list (lint-checker-name checker)
                           (lint-checker-description checker)
                           (if (memq checker %network-dependent-checkers)
                               #t
                               #f)))
                   %all-checkers))
           inf)))
     (map
      (match-lambda
        ((name description network-dependent?)
         (cons
          (list name description network-dependent?)
          (if network-dependent?
              '()
              (log-time
               (simple-format #f "getting ~A lint warnings" name)
               (lambda ()
                 (inferior-eval-with-store inf store (lint-warnings-for-checker
                                                      name))))))))
      checkers))))

(define (all-inferior-package-derivations store inf packages)
  (define inferior-%supported-systems
    (inferior-eval '(@ (guix packages) %supported-systems) inf))

  (define supported-system-pairs
    (map (lambda (system)
           (cons system system))
         inferior-%supported-systems))

  (define supported-system-cross-build-pairs
    (map (lambda (system)
           (filter-map (lambda (target)
                         (and (not (string=? system target))
                              (cons system target)))
                       inferior-%supported-systems))
         inferior-%supported-systems))

  (define (proc packages system-target-pairs)
    `(lambda (store)
       (define package-transitive-supported-systems-supports-multiple-arguments? #t)

       (define (get-supported-systems package system)
         (or (and package-transitive-supported-systems-supports-multiple-arguments?
                  (catch
                    'wrong-number-of-args
                    (lambda ()
                      (package-transitive-supported-systems package system))
                    (lambda (key . args)
                      ;; Older Guix revisions don't support two
                      ;; arguments to
                      ;; package-transitive-supported-systems
                      (simple-format
                       (current-error-port)
                       "info: package-transitive-supported-systems doesn't support two arguments, falling back to one\n")
                      (set! package-transitive-supported-systems-supports-multiple-arguments? #f)
                      #f)))
             (catch
               #t
               (lambda ()
                 (package-transitive-supported-systems package))
               (lambda (key . args)
                 (simple-format
                  (current-error-port)
                  "error: while processing ~A, unable to compute transitive supported systems\n"
                  (package-name package))
                 (simple-format
                  (current-error-port)
                  "error ~A: ~A\n" key args)
                 #f))))

       (define (derivations-for-system-and-target inferior-package-id package system target)
         (catch
           'misc-error
           (lambda ()
             (guard (c ((package-cross-build-system-error? c)
                        #f))
               (list inferior-package-id
                     system
                     target
                     (let ((file-name
                            (derivation-file-name
                             (if (string=? system target)
                                 (package-derivation store package system)
                                 (package-cross-derivation store package
                                                           target
                                                           system)))))
                       (add-temp-root store file-name)
                       file-name))))
           (lambda args
             ;; misc-error #f ~A ~S (No
             ;; cross-compilation for
             ;; clojure-build-system yet:
             #f)))

       (append-map
        (lambda (inferior-package-id)
          (let ((package (hashv-ref %package-table inferior-package-id)))
            (catch
              #t
              (lambda ()
                (append-map
                 (lambda (system)
                   (let ((supported-systems (package-supported-systems package)))
                     (if supported-systems
                         (filter-map
                          (lambda (target)
                            (derivations-for-system-and-target inferior-package-id
                                                               package
                                                               system
                                                               target))
                          (lset-intersection
                           string=?
                           supported-systems
                           (list ,@(map cdr system-target-pairs))))
                         '())))
                 (delete-duplicates
                  (list ,@(map car system-target-pairs))
                  string=?)))
              (lambda (key . args)
                (if (and (eq? key 'system-error)
                         (eq? (car args) 'fport_write))
                    (begin
                      (simple-format
                       (current-error-port)
                       "error: while processing ~A, exiting: ~A: ~A\n"
                       (package-name package)
                       key
                       args)
                      (exit 1))
                    (begin
                      (simple-format
                       (current-error-port)
                       "error: while processing ~A ignoring error: ~A: ~A\n"
                       (package-name package)
                       key
                       args)
                      '()))))))
        (list ,@(map inferior-package-id packages)))))

  (append-map
   (lambda (system-target-pairs)
     (format (current-error-port)
             "heap size: ~a MiB~%"
             (round
              (/ (assoc-ref (gc-stats) 'heap-size)
                 (expt 2. 20))))
     (log-time
      (simple-format #f "getting derivations for ~A" system-target-pairs)
      (lambda ()
        (catch
          'match-error
          (lambda ()
            (inferior-eval '(invalidate-derivation-caches!) inf))
          (lambda (key . args)
            (simple-format
             (current-error-port)
             "warning: ignoring match-error from calling inferior invalidate-derivation-caches!\n")))
        (inferior-eval-with-store inf store (proc packages system-target-pairs)))))
   (append (map list supported-system-pairs)
           supported-system-cross-build-pairs)))

(define (deduplicate-inferior-packages packages)
  (pair-fold
   (lambda (pair result)
     (if (null? (cdr pair))
         (cons (first pair) result)
         (let* ((a (first pair))
                (b (second pair))
                (a-name (inferior-package-name a))
                (b-name (inferior-package-name b))
                (a-version (inferior-package-version a))
                (b-version (inferior-package-version b)))
           (if (and (string=? a-name b-name)
                    (string=? a-version b-version))
               (begin
                 (simple-format (current-error-port)
                                "warning: ignoring duplicate package: ~A (~A)\n"
                                a-name
                                a-version)
                 result)
               (cons a result)))))
   '()
   (sort packages
         (lambda (a b)
           (let ((a-name (inferior-package-name a))
                 (b-name (inferior-package-name b)))
             (if (string=? a-name b-name)
                 (let ((a-version (inferior-package-version a))
                       (b-version (inferior-package-version b)))
                   (if (string=? a-version b-version)
                       ;; The name and version are the same, so try and pick
                       ;; the same package each time, by looking at the
                       ;; location.
                       (let ((a-location (inferior-package-location a))
                             (b-location (inferior-package-location b)))
                         (< (location-line a-location)
                            (location-line b-location)))
                       (string<? (inferior-package-version a)
                                 (inferior-package-version b))))
                 (string<? a-name
                           b-name)))))))

(define (insert-packages conn inf packages)
  (let* ((package-license-set-ids
          (log-time "fetching inferior package license metadata"
                    (lambda ()
                      (inferior-packages->license-set-ids conn inf
                                                          packages))))
         (packages-metadata-ids
          (log-time "fetching inferior package metadata"
                    (lambda ()
                      (inferior-packages->package-metadata-ids
                       conn packages package-license-set-ids)))))

    (log-time "getting package-ids"
              (lambda ()
                (inferior-packages->package-ids
                 conn
                 (zip (map inferior-package-name packages)
                      (map inferior-package-version packages)
                      packages-metadata-ids))))))

(define (insert-lint-warnings conn inferior-package-id->package-database-id
                              lint-checker-ids
                              lint-warnings-data)
  (lint-warnings-data->lint-warning-ids
   conn
   (append-map
    (lambda (lint-checker-id warnings-by-package-id)
      (append-map
       (match-lambda
         ((package-id . warnings)
          (map
           (match-lambda
             ((location-data messages-by-locale)
              (let ((location-id
                     (location->location-id
                      conn
                      (apply location location-data)))
                    (lint-warning-message-set-id
                     (lint-warning-message-data->lint-warning-message-set-id
                      conn
                      messages-by-locale)))
                (list lint-checker-id
                      (inferior-package-id->package-database-id package-id)
                      location-id
                      lint-warning-message-set-id))))
           (fold (lambda (location-and-messages result)
                   (if (member location-and-messages result)
                       (begin
                         (apply
                          simple-format
                          (current-error-port)
                          "warning: skipping duplicate lint warning ~A ~A\n"
                          location-and-messages)
                         result)
                       (append result
                               (list location-and-messages))))
                 '()
                 warnings))))
       warnings-by-package-id))
    lint-checker-ids
    (map cdr lint-warnings-data))))

(define (inferior-data->package-derivation-ids
         conn inf
         inferior-package-id->package-database-id
         inferior-data-4-tuples)
  (let ((derivation-ids
         (derivation-file-names->derivation-ids
          conn
          (map fourth inferior-data-4-tuples)))
        (flat-package-ids-systems-and-targets
         (map
          (match-lambda
            ((inferior-package-id system target derivation-file-name)
             (list (inferior-package-id->package-database-id
                    inferior-package-id)
                   system
                   target)))
          inferior-data-4-tuples)))


    (insert-package-derivations conn
                                flat-package-ids-systems-and-targets
                                derivation-ids)))

(define guix-store-path
  (let ((store-path #f))
    (lambda (store)
      (if (and store-path
               (file-exists? store-path))
          store-path
          (let ((config-guix (%config 'guix)))
            (if (and (file-exists? config-guix)
                     (string-prefix? "/gnu/store/" config-guix))
                (begin
                  (set! store-path
                    (dirname
                     (dirname
                      (%config 'guix))))
                  store-path)
                (begin
                  (invalidate-derivation-caches!)
                  (hash-clear! (@@ (guix packages) %derivation-cache))
                  (let* ((guix-package (@ (gnu packages package-management)
                                          guix))
                         (derivation (package-derivation store guix-package)))
                    (log-time
                     "building the guix derivation"
                     (lambda ()
                       (build-derivations store (list derivation))))

                    (let ((new-store-path
                           (derivation->output-path derivation)))
                      (set! store-path new-store-path)
                      (simple-format (current-error-port)
                                     "debug: guix-store-path: ~A\n"
                                     new-store-path)
                      new-store-path)))))))))

(define (nss-certs-store-path store)
  (let* ((nss-certs-package (@ (gnu packages certs)
                               nss-certs))
         (derivation (package-derivation store nss-certs-package)))
    (log-time
     "building the nss-certs derivation"
     (lambda ()
       (build-derivations store (list derivation))))
    (derivation->output-path derivation)))

(define (channel->derivation-file-name store channel)
  (define use-container? (defined?
                           'open-inferior/container
                           (resolve-module '(guix inferior))))

  (let ((inferior
         (if use-container?
             (open-inferior/container
              store
              (guix-store-path store)
              #:extra-shared-directories
              '("/gnu/store")
              #:extra-environment-variables
              (list (string-append
                     "SSL_CERT_DIR=" (nss-certs-store-path store))))
             (begin
               (simple-format #t "debug: using open-inferior\n")
               (open-inferior (guix-store-path store)
                              #:error-port (real-error-port))))))

    (catch
      #t
      (lambda ()
        (with-throw-handler #t
          (lambda ()
            ;; /etc is only missing if open-inferior/container has been used
            (when use-container?
              (inferior-eval
               '(begin
                  ;; Create /etc/pass, as %known-shorthand-profiles in (guix
                  ;; profiles) tries to read from this file. Because the environment
                  ;; is cleaned in build-self.scm, xdg-directory in (guix utils)
                  ;; falls back to accessing /etc/passwd.
                  (mkdir "/etc")
                  (call-with-output-file "/etc/passwd"
                    (lambda (port)
                      (display "root:x:0:0::/root:/bin/bash" port))))
               inferior))

            (let ((channel-instance
                   (first
                    (latest-channel-instances store
                                              (list channel)))))
              (inferior-eval '(use-modules (guix channels)
                                           (guix profiles))
                             inferior)
              (inferior-eval '(define channel-instance
                                (@@ (guix channels) channel-instance))
                             inferior)

              (let ((file-name
                     (inferior-eval-with-store
                      inferior
                      store
                      `(lambda (store)
                         (let ((instances
                                (list
                                 (channel-instance
                                  (channel (name ',(channel-name channel))
                                           (url    ,(channel-url channel))
                                           (branch ,(channel-branch channel))
                                           (commit ,(channel-commit channel)))
                                  ,(channel-instance-commit channel-instance)
                                  ,(channel-instance-checkout channel-instance)))))
                           (run-with-store store
                             (mlet* %store-monad ((manifest (channel-instances->manifest instances))
                                                  (derv (profile-derivation manifest)))
                               (mbegin %store-monad
                                 (return (derivation-file-name derv))))))))))

                (close-inferior inferior)

                file-name)))
          (lambda (key . parameters)
            (display (backtrace) (current-error-port))
            (display "\n" (current-error-port))
            (simple-format (current-error-port)
                           "error: channel->derivation-file-name: ~A: ~A\n"
                           key parameters))))
      (lambda args
        (close-inferior inferior)
        #f))))

(define (channel->manifest-store-item conn store channel)
  (let* ((manifest-store-item-derivation-file-name
          (log-time
           "computing the channel derivation"
           (lambda ()
             ;; Obtain a session level lock here, to avoid conflicts with
             ;; other jobs over the Git repository.
             (with-advisory-session-lock/log-time
              conn
              'channel->manifest-store-item
              (lambda ()
                (channel->derivation-file-name store channel))))))
         (derivation
          (read-derivation-from-file manifest-store-item-derivation-file-name)))
    (simple-format (current-error-port)
                   "debug: channel dervation: ~A\n"
                   manifest-store-item-derivation-file-name)
    (log-time
     "building the channel derivation"
     (lambda ()
       (build-derivations store (list derivation))))
    (derivation->output-path derivation)))

(define (channel->guix-store-item conn store channel)
  (catch
    #t
    (lambda ()
      (dirname
       (readlink
        (string-append (channel->manifest-store-item conn
                                                     store
                                                     channel)
                       "/bin"))))
    (lambda args
      (simple-format #t "guix-data-service: load-new-guix-revision: error: ~A\n" args)
      #f)))

(define (glibc-locales-for-guix-store-path store store-path)
  (let ((inf (if (defined?
                   'open-inferior/container
                   (resolve-module '(guix inferior)))
                 (open-inferior/container store store-path
                                          #:extra-shared-directories
                                          '("/gnu/store"))
                 (begin
                   (simple-format #t "debug: using open-inferior\n")
                   (open-inferior store-path
                                  #:error-port (real-error-port))))))
    (inferior-eval '(use-modules (srfi srfi-1)
                                 (srfi srfi-34)
                                 (guix grafts)
                                 (guix derivations))
                   inf)
    (inferior-eval '(when (defined? '%graft?) (%graft? #f)) inf)

    (let* ((inferior-glibc-locales
            (first
             (lookup-inferior-packages inf "glibc-locales")))
           (derivation (inferior-package-derivation store
                                                    inferior-glibc-locales))
           (output (derivation->output-path derivation)))
      (close-inferior inf)
      (log-time
       "building the glibc-locales derivation"
       (lambda ()
         (build-derivations store (list derivation))))

      output)))

(define (extract-information-from conn guix-revision-id commit store-path)
  (simple-format
   #t "debug: extract-information-from: ~A\n" store-path)
  (with-store store
    (set-build-options store
                       #:fallback? #t)

    (let* ((guix-locpath (getenv "GUIX_LOCPATH"))
           (inf (let ((guix-locpath
                       ;; Augment the GUIX_LOCPATH to include glibc-locales from
                       ;; the Guix at store-path, this should mean that the
                       ;; inferior Guix works, even if it's build using a different
                       ;; glibc version
                       (string-append
                        (glibc-locales-for-guix-store-path store store-path)
                        "/lib/locale"
                        ":" guix-locpath)))
                  ;; Unset the GUILE_LOAD_PATH and GUILE_LOAD_COMPILED_PATH to
                  ;; avoid the values for these being used in the
                  ;; inferior. Even though the inferior %load-path and
                  ;; %load-compiled-path has the inferior modules first, this
                  ;; can cause issues when there are modules present outside
                  ;; of the inferior Guix which aren't present in the inferior
                  ;; Guix (like the new (guix lint) module
                  (unsetenv "GUILE_LOAD_PATH")
                  (unsetenv "GUILE_LOAD_COMPILED_PATH")
                  (simple-format (current-error-port) "debug: set GUIX_LOCPATH to ~A\n"
                                 guix-locpath)
                  (if (defined?
                      'open-inferior/container
                      (resolve-module '(guix inferior)))
                    (open-inferior/container store store-path
                                             #:extra-shared-directories
                                             '("/gnu/store")
                                             #:extra-environment-variables
                                             (list (string-append
                                                    "GUIX_LOCPATH="
                                                    guix-locpath)))
                    (begin
                      (setenv "GUIX_LOCPATH" guix-locpath)
                      (simple-format #t "debug: using open-inferior\n")
                      (open-inferior store-path
                                     #:error-port (real-error-port)))))))
      (setenv "GUIX_LOCPATH" guix-locpath) ; restore GUIX_LOCPATH

      (when (eq? inf #f)
        (error "error: inferior is #f"))

      ;; Normalise the locale for the inferior process
      (catch
        'system-error
        (lambda ()
          (inferior-eval '(setlocale LC_ALL "en_US.utf8") inf))
        (lambda (key . args)
          (simple-format (current-error-port)
                         "warning: failed to set locale to en_US.utf8: ~A ~A\n"
                         key args)
          (display "trying to setlocale to en_US.UTF-8 instead\n"
                   (current-error-port))
          (with-exception-handler
            (lambda (key . args)
              (simple-format
               (current-error-port)
               "warning: failed to set locale to en_US.UTF-8: ~A ~A\n"
               key args))
            (lambda ()
              (inferior-eval '(setlocale LC_ALL "en_US.UTF-8") inf)))))

      (inferior-eval '(use-modules (srfi srfi-1)
                                   (srfi srfi-34)
                                   (guix grafts)
                                   (guix derivations)
                                   (gnu tests))
                     inf)
      (inferior-eval '(when (defined? '%graft?) (%graft? #f)) inf)

      (catch
        #t
        (lambda ()
          (let* ((packages
                  (log-time
                   "fetching inferior packages"
                   (lambda ()
                     (deduplicate-inferior-packages
                      (inferior-packages inf)))))
                 (inferior-lint-warnings
                  (log-time
                   "fetching inferior lint warnings"
                   (lambda ()
                     (all-inferior-lint-warnings inf store))))
                 (inferior-data-4-tuples
                  (log-time
                   "getting inferior derivations"
                   (lambda ()
                     (all-inferior-package-derivations store inf packages))))
                 (inferior-system-tests
                  (log-time
                   "getting inferior system tests"
                   (lambda ()
                     (all-inferior-system-tests inf store)))))

            (log-time
             "acquiring advisory transaction lock: load-new-guix-revision-inserts"
             (lambda ()
               ;; Wait until this is the only transaction inserting data, to
               ;; avoid any concurrency issues
               (obtain-advisory-transaction-lock conn
                                                 'load-new-guix-revision-inserts)))
            (let* ((package-ids
                    (insert-packages conn inf packages))
                   (inferior-package-id->package-database-id
                    (let ((lookup-table
                           (alist->hashq-table
                            (map (lambda (package package-id)
                                   (cons (inferior-package-id package)
                                         package-id))
                                 packages
                                 package-ids))))
                      (lambda (inferior-id)
                        (or
                         (hashq-ref lookup-table inferior-id)
                         (error
                          (simple-format
                           #f
                           "error: inferior-package-id->package-database-id: ~A missing\n"
                           inferior-id)))))))

              (simple-format
               #t "debug: finished loading information from inferior\n")
              (close-inferior inf)

              (when inferior-lint-warnings
                (let* ((lint-checker-ids
                        (lint-checkers->lint-checker-ids
                         conn
                         (map car inferior-lint-warnings)))
                       (lint-warning-ids
                        (insert-lint-warnings
                         conn
                         inferior-package-id->package-database-id
                         lint-checker-ids
                         inferior-lint-warnings)))
                  (insert-guix-revision-lint-checkers conn
                                                      guix-revision-id
                                                      lint-checker-ids)

                  (insert-guix-revision-lint-warnings conn
                                                      guix-revision-id
                                                      lint-warning-ids)))

              (insert-system-tests-for-guix-revision conn
                                                     guix-revision-id
                                                     inferior-system-tests)

              (let ((package-derivation-ids
                     (log-time
                      "inferior-data->package-derivation-ids"
                      (lambda ()
                        (inferior-data->package-derivation-ids
                         conn inf inferior-package-id->package-database-id
                         inferior-data-4-tuples)))))
                (update-builds-derivation-output-details-set-id
                 conn
                 (map fourth inferior-data-4-tuples))

                (insert-guix-revision-package-derivations conn
                                                          guix-revision-id
                                                          package-derivation-ids)
                (simple-format
                 #t "Successfully loaded ~A package/derivation pairs\n"
                 (length package-derivation-ids)))))
          #t)
        (lambda (key . args)
          (simple-format (current-error-port)
                         "Failed extracting information from commit: ~A\n\n" commit)
          (simple-format (current-error-port)
                         "  ~A ~A\n\n" key args)
          #f)
        (lambda (key . args)
          (display-backtrace (make-stack #t) (current-error-port)))))))

(define (update-package-versions-table conn git-repository-id commit)
  (log-time
   "lock table: package_versions_by_guix_revision_range"
   (lambda ()
     ;; Lock the table to wait for other transactions to commit before updating
     ;; the table
     (exec-query
      conn
      "
LOCK TABLE ONLY package_versions_by_guix_revision_range
  IN SHARE ROW EXCLUSIVE MODE")))

  (for-each
   (match-lambda
     ((branch-name)
      (log-time
       (simple-format #f "deleting package version entries for ~A" branch-name)
       (lambda ()
         (exec-query
          conn
          "
DELETE FROM package_versions_by_guix_revision_range
WHERE git_repository_id = $1 AND branch_name = $2"
          (list git-repository-id
                branch-name))))
      (log-time
       (simple-format #f "inserting package version entries for ~A" branch-name)
       (lambda ()
         (exec-query
          conn
          "
INSERT INTO package_versions_by_guix_revision_range
SELECT DISTINCT
       $1::integer AS git_repository_id,
       $2 AS branch_name,
       packages.name AS package_name,
       packages.version AS package_version,
       first_value(guix_revisions.id)
         OVER package_version AS first_guix_revision_id,
       last_value(guix_revisions.id)
         OVER package_version AS last_guix_revision_id
FROM packages
INNER JOIN (
  SELECT DISTINCT package_derivations.package_id,
                  guix_revision_package_derivations.revision_id
  FROM package_derivations
  INNER JOIN guix_revision_package_derivations
    ON package_derivations.id = guix_revision_package_derivations.package_derivation_id
) AS revision_packages ON packages.id = revision_packages.package_id
INNER JOIN guix_revisions ON revision_packages.revision_id = guix_revisions.id
INNER JOIN git_branches ON guix_revisions.commit = git_branches.commit
WHERE git_branches.name = $2
WINDOW package_version AS (
  PARTITION BY packages.name, packages.version
  ORDER BY git_branches.datetime
  RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
)
ORDER BY packages.name, packages.version"
          (list git-repository-id branch-name))))))
   (exec-query
    conn
    "SELECT name FROM git_branches WHERE commit = $1 AND git_repository_id = $2"
    (list commit git-repository-id)))

  #t)

(define (store-item-for-channel conn channel)
  (with-store store
    (set-build-options store #:fallback? #t)
    (channel->guix-store-item conn
                              store
                              channel)))

(define (load-new-guix-revision conn git-repository-id commit)
  (let* ((channel-for-commit
          (channel (name 'guix)
                   (url (git-repository-id->url
                         conn
                         git-repository-id))
                   (commit commit)))
         (store-item
          (store-item-for-channel conn channel-for-commit)))
    (if store-item
        (let ((guix-revision-id
               (insert-guix-revision conn git-repository-id
                                     commit store-item)))
          (and
           guix-revision-id
           (if (defined? 'channel-news-for-commit
                 (resolve-module '(guix channels)))
               (insert-channel-news-entries-for-guix-revision
                conn
                guix-revision-id
                (channel-news-for-commit channel-for-commit commit))
               (begin
                 (simple-format #t "debug: importing channel news not supported\n")
                 #t))

           (extract-information-from conn guix-revision-id
                                     commit store-item)
           (update-package-versions-table conn git-repository-id commit)
           (update-package-derivations-table conn
                                             git-repository-id
                                             guix-revision-id
                                             commit)))
        (begin
          (simple-format #t "Failed to generate store item for ~A\n"
                         commit)
          #f))))

(define (enqueue-load-new-guix-revision-job conn git-repository-id commit source)
  (define query
    "
INSERT INTO load_new_guix_revision_jobs (git_repository_id, commit, source)
VALUES ($1, $2, $3)
ON CONFLICT DO NOTHING
RETURNING id;")

  (match (exec-query conn
                     query
                     (list (number->string git-repository-id)
                           commit
                           source))
    ((result)
     result)
    (() #f)))

(define (select-job-for-commit conn commit)
  (let ((result
         (exec-query
          conn
          (string-append
           "SELECT id, commit, source, git_repository_id "
           "FROM load_new_guix_revision_jobs WHERE commit = $1")
          (list commit))))
    result))

(define* (select-recent-job-events conn
                                   #:key (limit 8))
  (define query
    (string-append
     "
SELECT
  load_new_guix_revision_jobs.id,
  load_new_guix_revision_jobs.commit,
  load_new_guix_revision_jobs.source,
  load_new_guix_revision_jobs.git_repository_id,
  load_new_guix_revision_job_events.event,
  load_new_guix_revision_job_events.occurred_at
FROM load_new_guix_revision_jobs
INNER JOIN load_new_guix_revision_job_events
  ON load_new_guix_revision_job_events.job_id = load_new_guix_revision_jobs.id
ORDER BY load_new_guix_revision_job_events.occurred_at DESC
LIMIT " (number->string limit)))

  (exec-query conn query))

(define (select-jobs-and-events conn before-id limit)
  (define query
    (string-append
     "
SELECT
  load_new_guix_revision_jobs.id,
  load_new_guix_revision_jobs.commit,
  load_new_guix_revision_jobs.source,
  load_new_guix_revision_jobs.git_repository_id,
  load_new_guix_revision_jobs.created_at,
  load_new_guix_revision_jobs.succeeded_at,
  (
    SELECT JSON_AGG(
      json_build_object('event', event, 'occurred_at', occurred_at) ORDER BY occurred_at ASC
    )
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id
  ),
  EXISTS (
    SELECT 1 FROM load_new_guix_revision_job_logs WHERE job_id = load_new_guix_revision_jobs.id
  ) AS log_exists
FROM load_new_guix_revision_jobs
"
     (if before-id
         (string-append
          "WHERE load_new_guix_revision_jobs.id < "
          (number->string before-id))
         "")
     "
ORDER BY load_new_guix_revision_jobs.id DESC
"
     (if limit
         (string-append
          "LIMIT " (number->string limit))
         "")))

  (map
   (match-lambda
     ((id commit source git-repository-id created-at succeeded-at
          events-json log-exists?)
      (list id commit source git-repository-id created-at succeeded-at
            (if (string-null? events-json)
                #()
                (json-string->scm events-json))
            (string=? log-exists? "t"))))
   (exec-query conn query)))

(define (select-unprocessed-jobs-and-events conn)
  (define query
    "
SELECT
  load_new_guix_revision_jobs.id,
  load_new_guix_revision_jobs.commit,
  load_new_guix_revision_jobs.source,
  load_new_guix_revision_jobs.git_repository_id,
  load_new_guix_revision_jobs.created_at,
  (
    SELECT JSON_AGG(
      json_build_object('event', event, 'occurred_at', occurred_at) ORDER BY occurred_at ASC
    )
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id
  ),
  EXISTS (
    SELECT 1 FROM load_new_guix_revision_job_logs WHERE job_id = load_new_guix_revision_jobs.id
  ) AS log_exists,
  commit IN (
    SELECT commit FROM (
      SELECT DISTINCT ON (name)
        name, git_branches.commit
      FROM git_branches
      WHERE
        git_branches.git_repository_id = load_new_guix_revision_jobs.git_repository_id AND
        git_branches.commit IS NOT NULL
      ORDER BY name, datetime DESC
    ) branches_and_latest_commits
  ) AS latest_branch_commit
FROM load_new_guix_revision_jobs
WHERE
  succeeded_at IS NULL AND
  (
    SELECT COUNT(*)
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id AND event = 'retry'
  ) >= (
    SELECT COUNT(*)
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id AND event = 'failure'
  )
ORDER BY latest_branch_commit DESC, id DESC")

  (map
   (match-lambda
     ((id commit source git-repository-id created-at
          events-json log-exists? latest-branch-commit)
      (list id commit source git-repository-id created-at
            (if (string-null? events-json)
                #()
                (json-string->scm events-json))
            (string=? log-exists? "t")
            (string=? latest-branch-commit "t"))))
   (exec-query conn query)))

(define (select-jobs-and-events-for-commit conn commit)
  (define query
    "
SELECT
  load_new_guix_revision_jobs.id,
  load_new_guix_revision_jobs.source,
  load_new_guix_revision_jobs.git_repository_id,
  load_new_guix_revision_jobs.created_at,
  load_new_guix_revision_jobs.succeeded_at,
  (
    SELECT JSON_AGG(
      json_build_object('event', event, 'occurred_at', occurred_at) ORDER BY occurred_at ASC
    )
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id
  ),
  EXISTS (
    SELECT 1 FROM load_new_guix_revision_job_logs WHERE job_id = load_new_guix_revision_jobs.id
  ) AS log_exists
FROM load_new_guix_revision_jobs
WHERE commit = $1
ORDER BY load_new_guix_revision_jobs.id DESC")

  (map
   (match-lambda
     ((id source git-repository-id created-at succeeded-at
          events-json log-exists?)
      (list id commit source git-repository-id created-at succeeded-at
            (if (string-null? events-json)
                #()
                (json-string->scm events-json))
            (string=? log-exists? "t"))))
   (exec-query conn query (list commit))))

(define (most-recent-n-load-new-guix-revision-jobs conn n)
  (let ((result
         (exec-query
          conn
          (string-append
           "SELECT id, commit, source, git_repository_id "
           "FROM load_new_guix_revision_jobs ORDER BY id ASC LIMIT $1")
          (list (number->string n)))))
    result))

(define (select-job-for-update conn id)
  (exec-query
   conn
   (string-append
    "SELECT id, commit, source, git_repository_id "
    "FROM load_new_guix_revision_jobs "
    "WHERE id = $1 AND succeeded_at IS NULL "
    "FOR NO KEY UPDATE SKIP LOCKED")
   (list id)))

(define (record-job-event conn job-id event)
  (exec-query
   conn
   (string-append
    "INSERT INTO load_new_guix_revision_job_events (job_id, event) "
    "VALUES ($1, $2)")
   (list job-id event)))

(define (record-job-succeeded conn id)
  (exec-query
   conn
   (string-append
    "UPDATE load_new_guix_revision_jobs "
    "SET succeeded_at = clock_timestamp() "
    "WHERE id = $1 ")
   (list id)))

(define (fetch-unlocked-jobs conn)
  (define query "
SELECT
  id,
  commit IN (
    SELECT commit FROM (
      SELECT DISTINCT ON (name)
        name, git_branches.commit
      FROM git_branches
      WHERE
        git_branches.git_repository_id = load_new_guix_revision_jobs.git_repository_id AND
        git_branches.commit IS NOT NULL
      ORDER BY name, datetime DESC
    ) branches_and_latest_commits
  ) AS latest_branch_commit
FROM load_new_guix_revision_jobs
WHERE
  succeeded_at IS NULL AND
  (
    SELECT COUNT(*)
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id AND event = 'retry'
  ) >= (
    SELECT COUNT(*)
    FROM load_new_guix_revision_job_events
    WHERE job_id = load_new_guix_revision_jobs.id AND event = 'failure'
  )
ORDER BY latest_branch_commit DESC, id DESC
FOR NO KEY UPDATE OF load_new_guix_revision_jobs
SKIP LOCKED")

  (map
   (match-lambda
     ((id priority)
      (list id
            (string=? priority "t"))))
   (exec-query conn query)))

(define (process-load-new-guix-revision-job id)
  (with-postgresql-connection
   (simple-format #f "load-new-guix-revision ~A" id)
   (lambda (conn)
     ;; Fix the hash encoding of derivation_output_details. This'll only run
     ;; once on any given database, but is kept here just to make sure any
     ;; instances have the data updated.
     (fix-derivation-output-details-hash-encoding conn)

     (exec-query conn "BEGIN")

     (match (select-job-for-update conn id)
       (((id commit source git-repository-id))

        ;; With a separate connection, outside of the transaction so the event
        ;; gets persisted regardless.
        (with-postgresql-connection
         (simple-format #f "load-new-guix-revision ~A start-event" id)
         (lambda (start-event-conn)
           (record-job-event start-event-conn id "start")))

        (simple-format #t "Processing job ~A (commit: ~A, source: ~A)\n\n"
                       id commit source)

        (if (or (guix-revision-exists? conn git-repository-id commit)
                (eq? (log-time
                      (string-append "loading revision " commit)
                      (lambda ()
                        (let* ((previous-output-port (current-output-port))
                               (previous-error-port (current-error-port))
                               (result
                                (with-postgresql-connection
                                 (simple-format #f "load-new-guix-revision ~A logging" id)
                                 (lambda (logging-conn)
                                   (insert-empty-log-entry logging-conn id)
                                   (let ((logging-port (log-port id logging-conn)))
                                     (set-current-output-port logging-port)
                                     (set-current-error-port logging-port)
                                     (let ((result
                                            (parameterize ((current-build-output-port logging-port)
                                                           (real-error-port previous-error-port))
                                              (catch #t
                                                (lambda ()
                                                  (load-new-guix-revision conn
                                                                          git-repository-id
                                                                          commit))
                                                (lambda (key . args)
                                                  (simple-format
                                                   (current-error-port)
                                                   "error: load-new-guix-revision: ~A ~A\n"
                                                   key args)
                                                  #f)))))
                                       (combine-log-parts! logging-conn id)

                                       ;; This can happen with GC, so do it explicitly
                                       (close-port logging-port)

                                       result))))))
                          (set-current-output-port previous-output-port)
                          (set-current-error-port previous-error-port)
                          result)))
                     #t))
            (begin
              (record-job-succeeded conn id)
              (record-job-event conn id "success")
              (exec-query conn "COMMIT")
              #t)
            (begin
              (exec-query conn "ROLLBACK")
              (record-job-event conn id "failure")
              #f)))
       (()
        (simple-format #t "job ~A not found to be processed\n"
                       id))))))