summaryrefslogtreecommitdiff
path: root/lib/common-functions
blob: 197c16c061a6aec676a3f7b5e54351cecdb94abb (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
#!/bin/sh

# contains functions used by more than one script

# shellcheck disable=SC2039,SC2119,SC2120

if [ -z "${base_dir}" ]; then
  # just to make shellcheck happy
  . '../lib/load-configuration'
fi

# TODO: remove hard-coded package suffixes

# find_pkgbuilds package repository git_repository git_revision mod_git_revision
# find the PKGBUILD and modification of $package from $repository
# sets $PKGBUILD and $PKGBUILD_mod

find_pkgbuilds() {

  local package="$1"
  local repository="$2"
  local git_repository="$3"
  local git_revision="$4"
  local mod_git_revision="$5"

  local repo_path
  eval 'repo_path="${repo_paths__'"${git_repository}"'}"'

  if [ ! "$(git -C "${repo_path}" cat-file -t "${git_revision}" 2> /dev/null)" = "commit" ]; then
    >&2 printf 'Repository %s does not contain commit %s, but it should.\n' \
      "${git_repository}" \
      "${git_revision}"
    return 2
  fi

  if [ ! "$(git -C "${repo_paths__archlinux32}" cat-file -t "${mod_git_revision}" 2> /dev/null)" = "commit" ]; then
    >&2 printf 'Repository archlinux32 does not contain commit %s, but it should.\n' \
      "${mod_git_revision}"
    return 2
  fi

  PKGBUILD=$(
    git -C "${repo_path}" archive "${git_revision}" -- "${package}/repos/${repository}-*/PKGBUILD" 2> /dev/null | \
      tar -t 2> /dev/null | \
      grep -- '/PKGBUILD$' | \
      grep -v -- '-i686/PKGBUILD$' | \
      grep -v -- '[-/]\(staging\|testing\|unstable\)-[^/]\+/PKGBUILD$' | \
      sort | \
      tail -n1
  )

  PKGBUILD_mod=$(
    git -C "${repo_paths__archlinux32}" archive "${mod_git_revision}" -- "${repository}/${package}/PKGBUILD" 2> /dev/null | \
      tar -t "${repository}/${package}/PKGBUILD" 2> /dev/null
  ) || true

  if [ -z "${PKGBUILD}" ] && \
    [ -z "${PKGBUILD_mod}" ]; then
    >&2 printf 'Neither PKGBUILD nor modification of PKGBUILD found for package "%s" from %s (%s), revisions %s and %s.\n' \
      "${package}" \
      "${repository}" \
      "${git_repository}" \
      "${git_revision}" \
      "${mod_git_revision}"
    return 1
  fi

}

# find_repository_with_commit commit
# find the repository which has $commit

find_repository_with_commit() {

  local repository

  for repository in ${repo_names}; do
    # shellcheck disable=SC2016
    if [ "$(eval git -C "$(printf '"${repo_paths__%s}"' "${repository}")" cat-file -t '"$1"' 2> /dev/null)" = "commit" ]; then
      echo "${repository}"
      return 0
    fi
  done
  >&2 printf 'find_repository_with_commit: Cannot find repository with commit "%s"\n' "$1"
  return 2

}

# find_git_repository_to_package_repository repository
# find the git repository which tracks the package repository $repository

find_git_repository_to_package_repository() {

  local repository

  repository=$(
    # shellcheck disable=SC2016
    {
      printf 'SELECT `git_repositories`.`name`'
      printf ' FROM `git_repositories`'
      mysql_join_git_repositories_upstream_repositories
      printf ' WHERE `upstream_repositories`.`name`=from_base64("%s");\n' \
        "$(printf '%s' "$1" | base64 -w0)"
    } | \
      mysql_run_query
  )
  if [ -z "${repository}" ]; then
    >&2 echo "can't find git repository with package repository '$1'"
    exit 1
  else
    echo "${repository}"
    return 0
  fi

}

# ls_master_mirror $path
# list content of $path on the master mirror (via rsync)

ls_master_mirror() {

  local path="$1"

  ${master_mirror_rsync_command} \
    "${master_mirror_rsync_directory}/${path}/" | \
    grep -v '\s\.$' | \
    awk '{print $5}'

}

# remove_old_package_versions

# removes all older versions of the packages given at stdin (by bpir.id)
# from all repositories less[1] stable than the current repository, as
# well as any different version of the same package from equally[2]
# stable repositories

# 1] determined by `repository_stability_relations`
# 2] identical `repositories`.`stability`

remove_old_package_versions() {

  ( # the new shell is intentional
    tmp_dir=$(mktemp -d 'tmp.common-functions.remove_old_package_versions.XXXXXXXXXX' --tmpdir)
    trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

    while read -r bpir_id; do

      # shellcheck disable=SC2016
      {
        printf 'SELECT '
        printf '`d_bpir`.`id`,'
        printf 'IF(`d_r`.`stability`=`o_r`.`stability` AND `d_bpir`.`id`!=`o_bpir`.`id`,1,0),'
        printf 'CONCAT('
          printf 'IF(`d_bp`.`epoch`=0,"",CONCAT(`d_bp`.`epoch`,":")),'
          printf '`d_bp`.`pkgver`,"-",'
          printf '`d_bp`.`pkgrel`,'
          printf 'IF(`d_bp`.`sub_pkgrel_omitted`,"",CONCAT(".",`d_bp`.`sub_pkgrel`))'
        printf '),'
        printf 'IF(`d_r`.`id`=`o_r`.`id`,1,0),'
        printf '`d_ra`.`name`,'
        printf '`d_r`.`name`,'
        printf '`d_bp`.`pkgname`,'
        printf 'CONCAT(`d_ra`.`name`,"/",'
        printf '`d_r`.`name`,"/",'
        mysql_package_name_query 'd_bp' 'd_bpa' 'd_bpc'
        printf ')'
        printf ' FROM `binary_packages_in_repositories` AS `d_bpir`'
        mysql_join_binary_packages_in_repositories_binary_packages 'd_bpir' 'd_bp'
        mysql_join_binary_packages_in_repositories_repositories 'd_bpir' 'd_r'
        printf ' AND `d_r`.`is_on_master_mirror`'
        mysql_join_repositories_architectures 'd_r' 'd_ra'
        mysql_join_binary_packages_architectures 'd_bp' 'd_bpa'
        printf ' LEFT'
        mysql_join_binary_packages_compressions 'd_bp' 'd_bpc'
        printf ' JOIN `binary_packages` AS `o_bp`'
        printf ' ON `d_bp`.`pkgname`=`o_bp`.`pkgname`'
        mysql_join_binary_packages_binary_packages_in_repositories 'o_bp' 'o_bpir'
        mysql_join_binary_packages_in_repositories_repositories 'o_bpir' 'o_r'
        printf ' AND `o_r`.`is_on_master_mirror`'
        printf ' AND `o_r`.`architecture`=`d_r`.`architecture`'
        printf ' JOIN `repository_stability_relations`'
        printf ' ON `repository_stability_relations`.`less_stable`=`d_r`.`stability`'
        printf ' AND `repository_stability_relations`.`more_stable`=`o_r`.`stability`'
        printf ' WHERE `o_bpir`.`id`=from_base64("%s")' \
          "$(
            printf '%s' "${bpir_id}" | \
              base64 -w0
          )"
        printf ';\n'
      } | \
        mysql_run_query | \
        tr '\t' ' ' | \
        expand_version 3 | \
        sort -k3V,3 -k2r,2 | \
        shrink_version 3 | \
        sed '
          s/^/'"${bpir_id}"' /
          $ a
        '
    done | \
      sed -n '
        /^\([0-9]\+\) \1 /,/^$/ d
        /^$/ d
        s/^[0-9]\+ \([0-9]\+ \)\(\S\+ \)\{2\}/\1/
        h
        /^[0-9]\+ 0 / {
          s/^\(\S\+ \)\{2\}//
          s/ \S\+$//
          w'"${tmp_dir}"'/repo-removes
          g
        }
        s/^\(\S\+ \)\{5\}//
        w'"${tmp_dir}"'/sftp-removes
        g
        s/ .*$//
        w'"${tmp_dir}"'/db-removes
      '

    for file in 'repo-removes' 'sftp-remove' 'db-removes'; do
      if [ -s "${tmp_dir}/${file}" ]; then
        sort -u "${tmp_dir}/${file}" | \
          sponge "${tmp_dir}/${file}"
      fi
    done

    # repo-remove packages
    while read -r arch repo pkgname; do
      mkdir "${tmp_dir}/transit"
      failsafe_rsync \
        "${master_mirror_rsync_directory}/${arch}/${repo}/${repo}.db."* \
        "${master_mirror_rsync_directory}/${arch}/${repo}/${repo}.files."* \
        "${tmp_dir}/transit/"
      repo-remove "${tmp_dir}/transit/${repo}.db.tar.gz" "${pkgname}"
      failsafe_rsync \
        "${tmp_dir}/transit/${repo}.db."* \
        "${tmp_dir}/transit/${repo}.files."* \
        "${master_mirror_rsync_directory}/${arch}/${repo}/"
      rm -rf --one-file-system "${tmp_dir}/transit"
    done < \
      "${tmp_dir}/repo-removes"

    # db-remove packages
    if [ -s "${tmp_dir}/db-removes" ]; then
      # shellcheck disable=SC2016
      {
        printf 'CREATE TEMPORARY TABLE `del` (`id` BIGINT NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`));\n'
        printf 'LOAD DATA LOCAL INFILE "%s" INTO TABLE `del` (`id`);\n' \
          "${tmp_dir}/db-removes"
        printf 'DELETE `binary_packages_in_repositories`'
        printf ' FROM `binary_packages_in_repositories`'
        printf ' JOIN `del`'
        printf ' ON `binary_packages_in_repositories`.`id`=`del`.`id`;\n'
        mysql_query_and_delete_unneeded_binary_packages
      } | \
        mysql_run_query | \
        sort -u >> \
        "${tmp_dir}/sftp-removes"
    fi

    # sftp-remove packages
    if [ -s "${tmp_dir}/sftp-removes" ]; then
      sed '
        p
        s/$/.sig/
      ' "${tmp_dir}/sftp-removes" | \
        sed '
          s|^|rm "|
          s|$|"|
        ' | \
        failsafe_sftp
    fi

  )

}

# wait_some_time $minimum $diff
# wait between minimum and minimum+diff seconds (diff defaults to 30)

wait_some_time() {
  local minimum=$1
  local diff=$2
  local random

  if [ -z "${diff}" ]; then
    diff=30
  fi

  random=$(
    dd if='/dev/urandom' count=1 2> /dev/null | \
      cksum | \
      cut -d' ' -f1
  )

  sleep $((minimum + random % diff))
}

# str_to_regex $string
# escape dots for use in regex

str_to_regex() {
  echo "$1" | \
    sed '
      s|[.[]|\\\0|g
    '
}

# make_source_info $package $repository $git_revision $mod_git_revision $output
# create .SRCINFO from PKGBUILD within git repositories, output to $output

make_source_info() {

  local package="$1"
  local repository="$2"
  local git_revision="$3"
  local mod_git_revision="$4"
  local output="$5"

  local git_repo
  local PKGBUILD
  local PKGBUILD_mod

  if ! git_repo=$(find_repository_with_commit "${git_revision}") || \
    [ -z "${git_repo}" ]; then
    return 1
  fi

  if ! find_pkgbuilds "${package}" "${repository}" "${git_repo}" "${git_revision}" "${mod_git_revision}"; then
    return 1
  fi

  ( # the new shell is intentional

    local epoch
    local pkgver

    tmp_dir=$(mktemp -d "${work_dir}/tmp.make_source_info.XXXXXX")
    trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

    extract_source_directory "${git_repo}" "${git_revision}" "${mod_git_revision}" "${tmp_dir}" '0'

    {
      cd "${tmp_dir}"
      # some additional info
      printf 'upstream_git_repository = %s\n' "${git_repo}"
      printf 'PKGBUILD = %s\n' "${PKGBUILD}"
      printf 'PKGBUILD_mod = %s\n' "${PKGBUILD_mod}"
      makepkg --printsrcinfo
      cd ..
    } > \
      "${tmp_dir}/SRCINFO"

    unset epoch
    unset pkgver
    eval "$(
      sed -n '
        s/^\t\(epoch\|pkgver\) = /\1=/
        T
        p
      ' "${tmp_dir}/SRCINFO"
    )"
    sed -i '
      /^pkgname = /! b
      /= gtk-doc$/ b
      /= linux-api-headers$/ b
      s/= \(openjdk[0-9]\+\)-doc$/\0\n\tdepends = \1-src/
      t append_version
      s/= \(qt5\)-doc$/\0\n\tdepends = \1-base/
      t append_version
      s/= \(\S\+\)-i18n-\S\+$/\0\n\tdepends = \1/
      t append_version
      s/= \(linux\(-\S\+\)\?\)-\(docs\|headers\)$/\0\n\tdepends = \1/
      t append_version
      b
      :append_version
        s/$/='"${epoch}${epoch+:}${pkgver}"'/
    ' "${tmp_dir}/SRCINFO"

    cat "${tmp_dir}/SRCINFO" > \
      "${output}"

  )

}

# recursively_umount_and_rm $dir
# umount all mountpoints in $dir which are also in $dir's
#  filesystem, possibly also $dir itself and then
#  rm -rf --one-file-system $dir

recursively_umount_and_rm() {
  local dir="$1"

  if [ -z "${dir}" ]; then
    >&2 echo 'ERROR: recursively_umount_and_rm requires an argument'
    exit 42
  fi

  if [ ! -d "${dir}" ]; then
    >&2 printf 'ERROR: recursively_umount_and_rm requires a directory as argument - "%s" is not\n' \
      "${dir}"
    exit 42
  fi

  # the sh -c '...' construct branch below is borrowed from
  # archlinux/devtools lib/archroot.sh: is_subvolume(), is_same_fs() and
  # subvolume_delete_recursive()
  # shellcheck disable=SC1004,SC2016
  find "${dir}" \
    -depth \
    -xdev \
    -type d \
    -exec 'mountpoint' '-q' '{}' ';' \
    -exec 'sudo' 'umount' '-l' '{}' ';' \
    -prune \
    , \
    -inum 256 \
    -exec sh -c '
      [ "$(stat -f -c %T "$1")" = btrfs ] && \
      [ "$(stat -c %d "$1")" = "$2" ]
    ' {} "$(stat -c %d "${dir}")" \; \
    -exec btrfs subvolume delete {} \; \
    -prune || true
  rm -rf --one-file-system "${dir}" || true
}

# mangle_pkgbuild $PKGBUILD [$sub_pkgrel]
#  mangle $arch in PKBUILDs to contain i486, i686, pentium4
#  append $sub_pkgrel to the pkgrel
#  remove "lib32-" and "gcc-multilib" from {make,check,opt,}depends

mangle_pkgbuild() {
  local PKGBUILD="$1"
  local sub_pkgrel="$2"

  if [ -n "${sub_pkgrel}" ]; then
    sub_pkgrel=".${sub_pkgrel}"
  fi

  if grep -q '^\s*pkgname=["'"'"']\?lib32-' "${PKGBUILD}"; then
    sed -i '
      s/^\(\s*pkgrel=\)['"'"'"]\?\([0-9]\+\)\.[0-9]*['"'"'"]\?\s*\(#.*\)\?$/\1"\2"/
    ' "${PKGBUILD}"
  fi

  sed -i '
    /^arch=[^#]*any/!{
      /^arch=(/s/(/(i486 i686 pentium4 /
    }
    s/^\(\s*pkgrel=\)['"'"'"]\?\([0-9.]\+\)['"'"'"]\?\s*\(#.*\)\?$/\1"\2'"${sub_pkgrel}"'"/
  ' "${PKGBUILD}"

  sed -i '
    /^\s*\(make\|check\|opt\|\)depends\(_[^=[:space:]]\+\)\?=(/ {
      :a
        /^\s*\(\S[^=]*\)=(\([^()]*\(#[^\n]*\n\)\?\)*)/! {
          $! {
            N
            ba
          }
        }
        s/\(["'"'"'([:space:]]\)lib32-/\1/g
        s/\(["'"'"'([:space:]]\)gcc-multilib\(["'"'"')[:space:]]\)/\1gcc\2/g
    }
  ' "${PKGBUILD}"
}

# find_package_repository_to_package $package $git_repository $git_commit
# find the package repository a package from a given git repository
# belongs to

find_package_repository_to_package() {

  local package="$1"
  local git_repository="$2"
  local git_commit="$3"
  local repo_path
  local repo

  eval 'repo_path="${repo_paths__'"${git_repository}"'}"'

  if [ "${git_repository}" = 'archlinux32' ]; then
    repo=$(
      git -C "${repo_path}" archive "${git_commit}" -- | \
        tar -t --wildcards "*/${package}/" | \
        cut -d/ -f1 | \
        grep -vxF blacklist | \
        sort -u
    )
  else
    repo=$(
      git -C "${repo_path}" archive "${git_commit}" -- "${package}/repos" 2> /dev/null | \
        tar -t | \
        cut -d/ -f3 | \
        grep -vxF '' | \
        grep -v 'staging\|testing\|-unstable' | \
        grep -v -- '-i686$' | \
        sed 's|-[^-]\+$||' | \
        sort -u
    )
  fi

  if [ -z "${repo}" ]; then
    echo "find_package_repository_to_package(): no repo found" >&2
    return 1
  fi

  if [ "$(
    echo "${repo}" | \
      wc -l
    )" -ne 1 ]; then
    echo "find_package_repository_to_package(): multiple repos found" >&2
    return 1
  fi

  echo "${repo}"

}

# extract_source_directory $git_repo $rev $mod_rev $output $sub_pkgrel
# extract files found in the svn/git source directories
# $PKGBUILD and $PKGBUILD_mod are expected to be set correctly

extract_source_directory() {

  local git_repo="$1"
  # shellcheck disable=SC2034
  local rev="$2"
  local mod_rev="$3"
  local output="$4"
  local sub_pkgrel="$5"

  if [ -n "${PKGBUILD}" ]; then
    eval 'git -C "${repo_paths__'"${git_repo}"'}" archive "${rev}" -- "${PKGBUILD%/*}"' | \
      tar -x --strip-components=3 -C "${output}"
    printf '\n' >> \
      "${output}/PKGBUILD"
  fi

  if [ -n "${PKGBUILD_mod}" ]; then
    git -C "${repo_paths__archlinux32}" archive "${mod_rev}" -- "${PKGBUILD_mod%/*}" | \
      tar -x --overwrite --exclude 'PKGBUILD' --strip-components=2 -C "${output}" 2> /dev/null || \
      true
    git -C "${repo_paths__archlinux32}" archive "${mod_rev}" -- "${PKGBUILD_mod}" | \
      tar -Ox "${PKGBUILD_mod}" >> \
      "${output}/PKGBUILD"
    printf '\n' >> \
      "${output}/PKGBUILD"
  fi

  # we do not want to update pkgver, so we just undefine it
  printf 'unset -f pkgver\n' >> \
    "${output}/PKGBUILD"

  mangle_pkgbuild "${output}/PKGBUILD" "${sub_pkgrel}"

  # shellcheck disable=SC2016
  sed -i '/^\$Id\$$/d' "${output}/PKGBUILD"

  # we don't want write permissions on the PKGBUILD - otherwise pkgver()
  # will change the version! (**HACK**)
  chmod oga-w "${output}/PKGBUILD"

}

# download_sources_by_hash
# try to download all sources by their hash into the current directory
# returns 0 if any source was downloaded and 1 otherwise

download_sources_by_hash() {

  local return_value=1
  local tmp_dir
  local sum_type
  local arch_suffix

  if [ ! -f 'PKGBUILD' ]; then
    >&2 echo 'No PKGBUILD found - download_sources_by_hash() must be run from the source directory.'
    return 1
  fi

  tmp_dir=$(mktemp -d 'tmp.common-functions.download_sources_by_hash.XXXXXXXXXX' --tmpdir="$(pwd)")

  makepkg --printsrcinfo > "${tmp_dir}/.SRCINFO"

  for arch_suffix in '' '_i486' '_i686' '_pentium4'; do
    for sum_type in 'md5sum' 'sha1sum' 'sha256sum' 'sha512sum'; do
      grep '^\s*'"${sum_type}s${arch_suffix}"' = ' "${tmp_dir}/.SRCINFO" | \
        sed 's|^.* = ||' | \
        cat -n > \
        "${tmp_dir}/sums"
      grep '^\s*source'"${arch_suffix}"' = ' "${tmp_dir}/.SRCINFO" | \
        sed '
          s|^.* = ||
          s|::.*$||
          s|.*/||
        ' | \
        cat -n > \
        "${tmp_dir}/urls"
      if [ "$(wc -l < "${tmp_dir}/sums")" -eq "$(wc -l < "${tmp_dir}/urls")" ]; then
        join -1 1 -2 1 -o 1.2,2.2 "${tmp_dir}/sums" "${tmp_dir}/urls" > \
          "${tmp_dir}/joined"
        while read -r sum file; do
          if [ "${sum}" = 'SKIP' ]; then
            continue
          fi
          if echo "${sum}  ${file}" | \
            ${sum_type} -c > /dev/null 2>&1; then
            # the correct source is already there
            continue
          fi
          if wget -O "${tmp_dir}/transfer" "${source_by_hash_mirror}${sum_type}/${sum}"; then
            mv "${tmp_dir}/transfer" "${file}"
            return_value=0
          fi
        done < \
          "${tmp_dir}/joined"
      fi
    done
  done

  rm -rf --one-file-system "${tmp_dir}"
  return ${return_value}

}

# expand_version $column_num
# add "0:" to version in $colum_num-th column if no ":" is there (epoch)
# add "+0" to version in $colum_num-th column if no "+" is there (git count/hash)

expand_version() {
  local column_num
  column_num="$1"

  sed '
    /^\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*+/! s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*\)-/\1+0-/
    /^\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*:/! s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\)/\10:/
  '
}

# shrink_version $column_num
# remove "0:" from version in $colum_num-th column (epoch)
# remove "+0" from version in $colum_num-th column (git count/hash)

shrink_version() {
  local column_num
  column_num="$1"

  sed '
    s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*\)+0-/\1-/
    s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\)0:/\1/
  '
}

# sort_square_bracket_content $file
# sort the content of [] in $file, print to stdout

sort_square_bracket_content() {
  local file
  local line
  local token
  local token_list
  local rest
  file="$1"

  while read -r line; do
    printf '%s ' "${line}" | \
      tr ' ' '\n' | \
      while read -r token; do
        if echo "${token}" | \
          grep -qF '['; then
          printf '%s[' "${token%[*}"
          token="${token##*[}"
          token_list="${token%,}"
          while ! echo "${token_list}" | \
            grep -qF ']'; do
            read -r token
            token_list=$(
              printf '%s\n' \
                "${token_list}" \
                "${token%,}"
            )
          done
          rest="]${token_list#*]}"
          token_list="${token_list%%]*}"
          token=$(
            printf '%s' "${token_list}" | \
              sort | \
              sed 's|$|,|'
            printf '%s' "${rest}"
          )
        fi
        printf '%s\n' "${token}"
      done | \
      tr '\n' ' ' | \
      sed '
        s|, ]|]|g
        s| $||
      '
    printf '\n'
  done < \
    "${file}"
}

# smoothen_namcap_log $file
# remove unneccesary differences from namcap-logs:
#   - remove architecture specific information
#   - sort lines
#   - sort content of square brackets

smoothen_namcap_log() {
  local file
  file="$1"
  # shellcheck disable=SC2016
  sort_square_bracket_content "${file}" | \
    sed '
      # normalize architecture specific information
      s|i[34567]86|$ARCH|g
      s|x86\([-_]64\)\?|$ARCH|g
      # remove haskell hashes
      s|\('"'"'[^'"'"']*-[0-9.]\+\)-[a-zA-Z0-9]\{1,22\}\(-ghc[^'"'"']*'"'"'\)|\1\2|g
    ' | \
    sort | \
    sponge "${file}"
}

# trigger_mirror_refreshs
# trigger a refresh of capable tier 1 mirrors (as backup for master mirror)

trigger_mirror_refreshs() {
  local tmp_file

  tmp_file=$(mktemp 'tmp.common-functions.trigger_mirror_refreshs.XXXXXXXXXX' --tmpdir)
  date '+%s' > \
    "${tmp_file}"
  failsafe_rsync \
    "${tmp_file}" \
    "${master_mirror_rsync_directory}/lastupdate"
  rm "${tmp_file}"
  screen -wipe || true
  for trigger_url in ${mirror_refresh_trigger_urls}; do
    screen -S trigger-mirror-update -d -m curl -L --connect-timeout 10 "${trigger_url}"
  done
}

# extract_pkgname_epoch_pkgver_pkgrel_sub_pkgrel_arch_from_package_name
extract_pkgname_epoch_pkgver_pkgrel_sub_pkgrel_arch_from_package_name() {
  pkgname="$1"
  pkgname="${pkgname%.pkg.tar.xz}"
  arch="${pkgname##*-}"
  pkgname="${pkgname%-*}"
  sub_pkgrel="${pkgname##*-}"
  pkgname="${pkgname%-*}"
  pkgrel="${sub_pkgrel%.*}"
  if [ "${pkgrel}" = "${sub_pkgrel}" ]; then
    sub_pkgrel='0'
  else
    sub_pkgrel="${sub_pkgrel##*.}"
  fi
  epoch="${pkgname##*-}"
  pkgname="${pkgname%-*}"
  pkgver="${epoch#*:}"
  if [ "${pkgver}" = "${epoch}" ]; then
    epoch='0'
  else
    epoch="${epoch%%:*}"
  fi
}

# irc_say $channel [copy]
# say content of stdin in irc channel $channel (default: #archlinux32)
# and print copy to stdout if 'copy' is given

# shellcheck disable=SC2120
irc_say() {
  local channel
  local content
  if [ -z "$1" ]; then
    channel='#archlinux32'
  else
    channel="$1"
  fi
  if [ -s "${work_dir}/irc-shut-up" ] && \
    [ "$(date '+%s')" -gt "$(cat "${work_dir}/irc-shut-up")" ]; then
    rm "${work_dir}/irc-shut-up"
  fi
  content=$(cat)
  if [ "$2" = 'copy' ]; then
    printf '%s\n' "${content}"
  fi
  if [ -s "${work_dir}/irc-shut-up" ] && \
    [ -z "${channel%%#*}" ]; then
    return
  fi
  if [ -p "${irc_dir}/${channel}/in" ]; then
    printf '%s\n' "${content}" \
    | sponge "${irc_dir}/${channel}/in"
  else
    printf '%s\n' "${content}" \
    | sed 's@^@/j '"${channel}"' @' \
    | sponge "${irc_dir}/in"
  fi
}

# calculate_script_checksum
# calculate and print a checksum of the main script and all scripts in lib/
calculate_script_checksum() {
  {
    sha512sum "$0"
    find "${base_dir}/lib" -type f \
      -exec sha512sum '{}' \;
  } | \
    sort | \
    awk '{print $1}' | \
    sha512sum | \
    awk '{print $1}'
}

# verbose_flock
# flock wrapper with some informational output on error
verbose_flock() {
  local err=0
  flock "$@" || {
    err=$?
    lsof +c0 "/proc/$$/fd/$(
      printf '%s\n' "$@" | \
        grep -vm1 '^-'
    )" >&2 2>/dev/null || true
    >&2 printf 'FYI: I am %s.\n' "$$"
    return ${err}
  }
}

# recompress_gz $tmp_dir $file1.gz $file2.gz ...
# recompress the given file(s) to make them rsync friendly
recompress_gz() {
  tmp_file=$(mktemp "$1/recompress_gz.XXXXXXXX")
  shift
  local file
  for file in "$@"; do
    if [ ! -f "${file}" ]; then
      continue
    fi
    mv "${file}" "${tmp_file}"
    zcat "${tmp_file}" | \
      gzip --best --rsyncable > \
      "${file}"
  done
  rm "${tmp_file}"
}

# failsafe_sftp
# execute the commands from stdin on the master mirror, retrying if
# unsuccessful
# caveats:
#   - only checks for success of "rm", "ln", "rename"
#   - commands must be executable in arbitrary order
failsafe_sftp() {
  ( # new shell is intentional
    temp_dir=$(mktemp -d 'tmp.common-functions.sftp_failsafe.XXXXXXXXXX' --tmpdir)
    trial_counter=20
    trap 'rm -rf --one-file-system "${temp_dir}"' EXIT
    cat > "${temp_dir}/input"
    sed -n '
      s/^rm "\([^"]\+\)"$/- \1/
      s/^ln\( [^"]\S*\)* "\([^"]\+\)" "[^"]\+"$/+ \2/
      s/^rename "\([^"]\+\)" "\([^"]\+\)"$/- \1\n+ \2/
      T
      p
    ' "${temp_dir}/input" > \
      "${temp_dir}/expectations"
    if ${master_mirror_sftp_command} < "${temp_dir}/input"; then
      # we're done
      exit 0
    fi
    # make failing sftp commands non-fatal - maybe some succeeded above?
    sed -i '
      s/^[^-]/-\0/
    ' "${temp_dir}/input"
    # we stop on exhausted $trial_counter
    while [ ${trial_counter} -gt 0 ]; do
      wait_some_time 30
      # success requires 3 things:
      # - succeeding sftp executions (commands are non-critical already)
      # - succeeding sftp command to create listing (e.g. all expected
      #   files are found)
      # - no unexpected files were found
      if ${master_mirror_sftp_command} < \
        "${temp_dir}/input" && \
        sed '
          s/^+ \(\S\+\)$/ls -1 "\1"/
          s,^- \(\S\+/\)[^/]\+$,ls -1 "\1",
        ' "${temp_dir}/expectations" | \
          sort -u | \
          ${master_mirror_sftp_command} > "${temp_dir}/check" && \
        ! grep -qxF "$(
          sed -n '
            s/^- //
            T
            p
          ' "${temp_dir}/expectations"
        )" "${temp_dir}/check"; then
        exit 0
      fi
      trial_counter=$((trial_counter-1))
    done
    exit 1
  ) || \
    return $?
}

# failsafe_rsync
# execute rsync with the given parameters on the master mirror, retrying
# if unsuccessful
# caveats:
#  - output might be garbled
#  - error code will be projected into {0,1}
failsafe_rsync() {
  local trial_counter

  trial_counter=20
  if ${master_mirror_rsync_command} "$@"; then
    return 0
  fi
  while [ ${trial_counter} -gt 0 ]; do
    wait_some_time 30
    if ${master_mirror_rsync_command} "$@"; then
      return 0
    fi
    trial_counter=$((trial_counter-1))
  done
  return 1
}

# apply_trunk_patch source_dir diff_source_dir
# apply a patch between diff_source_dir/PKGBUILD and
# diff_source_dir/../../trunk/PKGBUILD onto source_dir/PKGBUILD
apply_trunk_patch() {
  local source_dir="$1"
  local diff_source_dir="$2"
  if [ -z "${diff_source_dir}" ]; then
    # no diff_source_dir => no action
    return
  fi
  chmod +w "${source_dir}/PKGBUILD"
  diff -u3 "${diff_source_dir}/PKGBUILD" "${diff_source_dir}/../../trunk/PKGBUILD" \
    | sed '
      1,2 s#^\(\(+++\|---\)\s\+\)\S\+/\(PKGBUILD\s.*\)$#\1\3#
    ' \
    | patch -p0 "${source_dir}/PKGBUILD"
  chmod -w "${source_dir}/PKGBUILD"
  find "${diff_source_dir}/../../trunk/" \
    -mindepth 1 \
    -maxdepth 1 \
    -not -name 'PKGBUILD' \
    -type f \
    -exec cp '{}' "${source_dir}" \;
}

# update_blocked_packages_count
# update the count how many packages are blocked by a build assignment
update_blocked_packages_count() {
  ( # new shell is intentional
    temp_dir=$(mktemp -d 'tmp.sanity-check.XXXXXXXXXX' --tmpdir)
    trap 'rm -rf --one-file-system "${temp_dir}"' EXIT
    # shellcheck disable=SC2016
    {
      printf 'SELECT '
      printf '`a_bp`.`build_assignment`,'
      printf '`b_bp`.`build_assignment`'
      printf ' FROM `binary_packages` AS `a_bp`'
      mysql_join_binary_packages_binary_packages_in_repositories 'a_bp' 'a_bpir'
      printf ' AND `a_bpir`.`repository`=%s' \
        "${repository_ids__any_build_list}"
      mysql_join_binary_packages_dependencies 'a_bp'
      mysql_join_dependencies_dependency_types
      mysql_join_dependencies_install_target_providers_with_versions
      mysql_join_install_target_providers_binary_packages '' 'b_bp'
      printf ' AND ('
        printf '`dependency_types`.`relevant_for_binary_packages`'
        printf ' OR `b_bp`.`pkgname` LIKE "haskell-%%"'
      printf ')'
      mysql_join_binary_packages_binary_packages_in_repositories 'b_bp' 'b_bpir'
      printf ' AND `a_bpir`.`repository`=%s' \
        "${repository_ids__any_build_list}"
      printf ' WHERE `a_bp`.`architecture`=`b_bp`.`architecture`'
      printf ' OR `a_bp`.`architecture`=%s' \
        "${architecture_ids__any}"
      printf ' OR `b_bp`.`architecture`=%s' \
        "${architecture_ids__any}"
    } | \
      mysql_run_query 'unimportant' | \
      tr '\t' ' ' | \
      sort -u | \
      sort -k1,1 > \
      "${temp_dir}/links.new"
    touch "${temp_dir}/links.1" "${temp_dir}/links.2"
    # new links (sorted by 1st column); old links (sorted by 1st / 2nd column)
    while [ -s "${temp_dir}/links.new" ]; do
      cat "${temp_dir}/links.1" "${temp_dir}/links.new" | \
        sort -k2,2 > \
        "${temp_dir}/links.2"
      sort -k1,1 "${temp_dir}/links.2" > \
        "${temp_dir}/links.1"
      duplicates=$(
        uniq -d "${temp_dir}/links.1"
      )
      if [ -n "${duplicates}" ]; then
        >&2 echo 'internal error: there are %s duplicate links' \
          "$(
            printf '%s\n' "${duplicates}" | \
              wc -l
          )"
        exit 42
      fi
      {
        {
          join -1 2 -2 1 -o 1.1,2.2 "${temp_dir}/links.2" "${temp_dir}/links.new"
          sort -k2,2 "${temp_dir}/links.new" | \
            join -1 2 -2 1 -o 1.1,2.2 - "${temp_dir}/links.1"
          sort -k2,2 "${temp_dir}/links.new" | \
            join -1 2 -2 1 -o 1.1,2.2 - "${temp_dir}/links.new"
        } | \
          sort -u
        sed 'p' "${temp_dir}/links.1"
      } | \
        sort | \
        uniq -u | \
        sort -k1,1 | \
        sponge "${temp_dir}/links.new"
    done
    cut -d' ' -f2 "${temp_dir}/links.2" | \
      uniq -c | \
      sed 's/^\s\+//' | \
      tr ' ' '\t' > \
      "${temp_dir}/link-counts"
    # shellcheck disable=SC2016
    {
      printf 'CREATE TEMPORARY TABLE `lc` ('
        printf '`count` MEDIUMINT,'
        printf '`ba_id` BIGINT,'
        printf 'PRIMARY KEY (`ba_id`)'
      printf ');\n'
      printf 'LOAD DATA LOCAL INFILE "%s" INTO TABLE `lc`(`count`,`ba_id`);\n' \
        "${temp_dir}/link-counts"
      printf 'UPDATE `build_assignments`'
      printf ' LEFT JOIN `lc`'
      printf ' ON `build_assignments`.`id`=`lc`.`ba_id`'
      printf ' SET `build_assignments`.`currently_blocking`=`lc`.`count`;\n'
    } | \
      mysql_run_query 'unimportant'
  )
}

# extract_dependencies_from_package $pkgfile
# extract make-, run- and check-depends from $pkgfile
# format: deptype install_target version_relation epoch version
extract_dependencies_from_package() {
  {
    bsdtar -Oxf "$1" '.PKGINFO' \
    | sed '
      s/^checkdepend = /check /
      t
      s/^depend = /run /
      t
      s/^makedepend = /make /
      t
      d
    ' \
    | sed '
      s/\(=\|[<>]=\?\)\([^-]\+\)\(-[^-]\+\)\?$/ \1 \2/
      t
      s/$/ >= '"${min_version}"'/
    ' \
    | sed '
      s/:\(\S\+\)$/ \1/
      t
      s/ \(\S\+\)$/ 0 \1/
    '
    # inject base & base-devel
    printf ' >= %s\n' \
      "${min_version}" \
    | tr ':' ' ' \
    | sed '
      s/^.*$/run base\0\nmake base-devel\0/
    '
  } \
  | sort -u
}

# expand_blacklist_architectures $tmp_file
# expand the architecture of the blacklisted packages given on stdin as
# lines
# $arch<tab>$pkgbase/$pkgname/$whatever
expand_blacklist_architectures() {
  # shellcheck disable=SC2016
  {
    printf 'SELECT `superior`.`name`,`inferior`.`name`'
    printf ' FROM `architectures` AS `inferior`'
    printf ' JOIN `architecture_compatibilities`'
    printf ' ON `architecture_compatibilities`.`built_for`=`inferior`.`id`'
    printf ' JOIN `architectures` AS `superior`'
    printf ' ON `architecture_compatibilities`.`runs_on`=`superior`.`id`'
    # "any" has a special role - it should be regarded as *inferior* to
    # all architectures
    printf ' WHERE `superior`.`name`!="any"'
    printf ' AND `inferior`.`name`!="any";\n'
    printf 'SELECT "any",`architectures`.`name`'
    printf ' FROM `architectures`;\n'
  } \
  | mysql_run_query \
  | sort -k1,1 \
  > "$1"
  sort -k1,1 \
  | join -1 1 -2 1 -o 1.2,2.2 "$1" - \
  | sort -u
}