summaryrefslogtreecommitdiffstats
path: root/tools/build-pkg.lua
blob: e898727f6bf51c067d123ca934d20f6917e32778 (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
#!/usr/bin/env lua

--[[
This file is part of MXE. See LICENSE.md for licensing information.

build-pkg, Build binary packages from MXE packages
Instructions: http://pkg.mxe.cc

Requirements: MXE, lua, fakeroot, dpkg-deb.
Usage: lua tools/build-pkg.lua
Packages are written to `*.tar.xz` files.
Debian packages are written to `*.deb` files.

Build in directory /usr/lib/mxe
This directory can not be changed in .deb packages.

To prevent build-pkg from creating deb packages,
set environment variable MXE_BUILD_PKG_NO_DEBS to 1
In this case fakeroot and dpkg-deb are not needed.

To switch off the second pass, set
MXE_BUILD_PKG_NO_SECOND_PASS to 1.
See https://github.com/mxe/mxe/issues/1111

To limit number of packages being built to x,
set environment variable MXE_BUILD_PKG_MAX_ITEMS to x.

To set list of MXE targets to build,
set environment variable MXE_BUILD_PKG_TARGETS to
the list of targets separated by space.
By default, all 4 major targets are built.

The following error:
> fakeroot, while creating message channels: Invalid argument
> This may be due to a lack of SYSV IPC support.
> fakeroot: error while starting the `faked' daemon.
can be caused by leaked ipc resources originating in fakeroot.
How to remove them: https://stackoverflow.com/a/4262545
]]

local max_items = tonumber(os.getenv('MXE_BUILD_PKG_MAX_ITEMS'))
local no_debs = os.getenv('MXE_BUILD_PKG_NO_DEBS')
local no_second_pass = os.getenv('MXE_BUILD_PKG_NO_SECOND_PASS')
local build_targets = os.getenv('MXE_BUILD_PKG_TARGETS')

local TODAY = os.date("%Y%m%d")

local MAX_TRIES = 10

local GIT = 'git --work-tree=./usr/ --git-dir=./usr/.git '
local GIT_USER = '-c user.name="build-pkg" ' ..
    '-c user.email="build-pkg@mxe" '

local BLACKLIST = {
    '^usr/installed/check%-requirements$',
    -- usr/share/cmake is useful
    '^usr/share/doc/',
    '^usr/share/info/',
    '^usr/share/man/',
    '^usr/share/gcc',
    '^usr/share/gtk-doc',
    '^usr/lib/nonetwork.so',
    '^usr/[^/]+/share/doc/',
    '^usr/[^/]+/share/info/',
}

local TARGETS = {
    'i686-w64-mingw32.static',
    'x86_64-w64-mingw32.static',
    'i686-w64-mingw32.shared',
    'x86_64-w64-mingw32.shared',
}
if build_targets then
    TARGETS = {}
    for target in build_targets:gmatch('(%S+)') do
        table.insert(TARGETS, target)
    end
end

local function echo(fmt, ...)
    print(fmt:format(...))
    io.stdout:flush()
end

local function log(fmt, ...)
    echo('[build-pkg]\t' .. fmt, ...)
end

-- based on http://lua-users.org/wiki/SplitJoin
local function split(self, sep, nMax, plain)
    if not sep then
        sep = '%s+'
    end
    assert(sep ~= '')
    assert(nMax == nil or nMax >= 1)
    local aRecord = {}
    if self:len() > 0 then
        nMax = nMax or -1
        local nField = 1
        local nStart = 1
        local nFirst, nLast = self:find(sep, nStart, plain)
        while nFirst and nMax ~= 0 do
            aRecord[nField] = self:sub(nStart, nFirst - 1)
            nField = nField + 1
            nStart = nLast + 1
            nFirst, nLast = self:find(sep, nStart, plain)
            nMax = nMax - 1
        end
        aRecord[nField] = self:sub(nStart)
    end
    return aRecord
end

local function trim(str)
    local text = str:gsub("%s+$", "")
    text = text:gsub("^%s+", "")
    return text
end

local function isInArray(element, array)
    for _, member in ipairs(array) do
        if member == element then
            return true
        end
    end
    return false
end

local function sliceArray(list, nelements)
    nelements = nelements or #list
    local new_list = {}
    for i = 1, nelements do
        new_list[i] = list[i]
    end
    return new_list
end

local function concatArrays(...)
    local result = {}
    for _, array in ipairs({...}) do
        for _, elem in ipairs(array) do
            table.insert(result, elem)
        end
    end
    return result
end

local function isInString(substring, string)
    return string:find(substring, 1, true)
end

local function shell(cmd)
    local f = io.popen(cmd, 'r')
    local text = f:read('*all')
    f:close()
    return text
end

local function execute(cmd)
    if _VERSION == 'Lua 5.1' then
        return os.execute(cmd) == 0
    else
        -- Lua >= 5.2
        return os.execute(cmd)
    end
end

local MXE_DIR = trim(shell('pwd'))

-- for tar, try gtar and gnutar first
local tools = {}
local function tool(name)
    if tools[name] then
        return tools[name]
    end
    if execute(("g%s --help > /dev/null 2>&1"):format(name)) then
        tools[name] = 'g' .. name
    elseif execute(("gnu%s --help > /dev/null 2>&1"):format(name)) then
        tools[name] = 'gnu' .. name
    else
        tools[name] = name
    end
    return tools[name]
end

local function fileExists(name)
    local f = io.open(name, "r")
    if f ~= nil then
        io.close(f)
        return true
    else
        return false
    end
end

local function isSymlink(name)
    return shell(("ls -l %q"):format(name)):sub(1, 1) == "l"
end

local function writeFile(filename, data)
    local file = io.open(filename, 'w')
    file:write(data)
    file:close()
end

local NATIVE_TARGET = trim(shell("ext/config.guess"))
local function isCross(target)
    return target ~= NATIVE_TARGET
end

local function getArch()
    local cmd = "dpkg-architecture -qDEB_BUILD_ARCH 2> /dev/null"
    return trim(shell(cmd))
end
local ARCH = getArch()

-- return target and package from item name
local function parseItem(item)
    return item:match("([^~]+)~([^~]+)")
end

-- return item name from target and package
local function makeItem(target, package)
    return target .. '~' .. package
end

-- return several tables describing packages for all targets
-- * list of items
-- * map from item to list of deps (which are also items)
-- * map from item to version
-- Item is a string like "target~pkg"
local function getItems()
    local items = {}
    local item2deps = {}
    local item2ver = {}
    local cmd = '%s print-deps-for-build-pkg MXE_TARGETS=%q'
    cmd = cmd:format(tool 'make', table.concat(TARGETS, ' '))
    local make = io.popen(cmd)
    for line in make:lines() do
        local deps = split(trim(line))
        if deps[1] == 'for-build-pkg' then
            -- first value is marker 'for-build-pkg'
            table.remove(deps, 1)
            -- first value is name of package which depends on
            local item = table.remove(deps, 1)
            -- second value is version of package
            local ver = table.remove(deps, 1)
            table.insert(items, item)
            item2deps[item] = deps
            item2ver[item] = ver
            local target, _ = parseItem(item)
            for _, dep_item in ipairs(deps) do
                local target2, _ = parseItem(dep_item)
                if isCross(target2) and target2 ~= target then
                    log("Cross-target dependency %s -> %s",
                        target2, target)
                end
            end
        end
    end
    make:close()
    return items, item2deps, item2ver
end

local function getInstalled()
    local installed = {}
    local f = io.popen('ls usr/*/installed/*')
    local pattern = '/([^/]+)/installed/([^/]+)'
    for file in f:lines() do
        local target, pkg = assert(file:match(pattern))
        table.insert(installed, makeItem(target, pkg))
    end
    f:close()
    return installed
end

-- graph is a map from item to a list of destinations
local function transpose(graph)
    local transposed = {}
    for item, destinations in pairs(graph) do
        for _, dest in ipairs(destinations) do
            if not transposed[dest] then
                transposed[dest] = {}
            end
            table.insert(transposed[dest], item)
        end
    end
    return transposed
end

local function reverse(list)
    local n = #list
    local reversed = {}
    for i = 1, n do
        reversed[i] = list[n - i + 1]
    end
    return reversed
end

-- return items ordered in build order
-- this means, if item depends on item2, then
-- item2 preceeds item1 in the list
local function sortForBuild(items, item2deps)
    local n = #items
    local item2followers = transpose(item2deps)
    -- Tarjan's algorithm
    -- https://en.wikipedia.org/wiki/Topological_sorting
    local build_list_reversed = {}
    local marked_permanently = {}
    local marked_temporarily = {}
    local function visit(item1)
        assert(not marked_temporarily[item1], 'not a DAG')
        if not marked_permanently[item1] then
            marked_temporarily[item1] = true
            local followers = item2followers[item1] or {}
            for _, item2 in ipairs(followers) do
                visit(item2)
            end
            marked_permanently[item1] = true
            marked_temporarily[item1] = false
            table.insert(build_list_reversed, item1)
        end
    end
    for _, item in ipairs(items) do
        if not marked_permanently[item] then
            visit(item)
        end
    end
    assert(#build_list_reversed == n)
    local build_list = reverse(build_list_reversed)
    assert(#build_list == n)
    return build_list
end

local function isDependency(item, dependency, item2deps)
    for _, dep in ipairs(item2deps[item]) do
        if dep == dependency then
            return true
        end
        if isDependency(dep, dependency, item2deps) then
            return true
        end
    end
    return false
end

local function makeItem2Index(build_list)
    local item2index = {}
    for index, item in ipairs(build_list) do
        assert(not item2index[item], 'Duplicate item')
        item2index[item] = index
    end
    return item2index
end

-- return if build_list is ordered topologically
local function isTopoOrdered(build_list, items, item2deps)
    if #build_list ~= #items then
        return false, 'Length of build_list is wrong'
    end
    local item2index = makeItem2Index(build_list)
    for item, deps in pairs(item2deps) do
        for _, dep in ipairs(deps) do
            if item2index[item] < item2index[dep] then
                return false, 'Item ' .. item ..
                    'is built before its dependency ' ..
                    dep
            end
        end
    end
    return true
end

local function isListed(file, list)
    for _, pattern in ipairs(list) do
        if file:match(pattern) then
            return true
        end
    end
    return false
end

local function isBlacklisted(file)
    return isListed(file, BLACKLIST)
end

local GIT_INITIAL = 'initial'
local GIT_ALL_PSEUDOITEM = 'all'

local function itemToBranch(item, pass)
    return pass .. '-' .. item:gsub('~', '_')
end

-- creates git repo in ./usr
local function gitInit()
    os.execute('mkdir -p ./usr')
    os.execute(GIT .. 'init --quiet')
end

local function gitTag(name)
    os.execute(GIT .. 'tag ' .. name)
end

local function gitConflicts()
    local cmd = GIT .. 'diff --name-only --diff-filter=U'
    local f = io.popen(cmd, 'r')
    local conflicts = {}
    for conflict in f:lines() do
        table.insert(conflicts, conflict)
    end
    f:close()
    return conflicts
end

-- git commits changes in ./usr
local function gitCommit(message)
    local cmd = GIT .. GIT_USER .. 'commit -a -m %q --quiet'
    assert(execute(cmd:format(message)))
end

local function gitCheckout(new_branch, deps, item2index, pass_of_deps)
    local main_dep = deps[1]
    if main_dep then
        main_dep = itemToBranch(main_dep, pass_of_deps)
    else
        main_dep = GIT_INITIAL
    end
    local cmd = '%s checkout -q -b %s %s'
    assert(execute(cmd:format(GIT, new_branch, main_dep)))
    -- merge with other dependencies
    for i = 2, #deps do
        local message = 'Merge with ' .. deps[i]
        local cmd2 = '%s %s merge -q %s -m %q'
        if not execute(cmd2:format(GIT,
            GIT_USER,
            itemToBranch(deps[i], pass_of_deps),
            message))
        then
            -- probably merge conflict
            local conflicts = table.concat(gitConflicts(), ' ')
            log('Merge conflicts: %s', conflicts)
            local cmd3 = '%s checkout --ours %s'
            assert(execute(cmd3:format(GIT, conflicts)))
            gitCommit(message)
        end
    end
    if #deps > 0 then
        -- prevent accidental rebuilds
        -- touch usr/*/installed/* files in build order
        -- see https://git.io/vuDJY
        local installed = getInstalled()
        table.sort(installed, function(x, y)
            return item2index[x] < item2index[y]
        end)
        for _, item in ipairs(installed) do
            local target, pkg = assert(parseItem(item))
            local cmd4 = 'touch -c usr/%s/installed/%s'
            execute(cmd4:format(target, pkg))
        end
    end
end

local function gitAdd()
    os.execute(GIT .. 'add --all --force .')
end

-- return two lists of filepaths under ./usr/
-- 1. new files
-- 2. changed files
local function gitStatus(item, item2deps, file2item)
    local new_files = {}
    local changed_files = {}
    local git_st = io.popen(GIT .. 'status --porcelain', 'r')
    for line in git_st:lines() do
        local status, file = line:match('(..) (.*)')
        assert(status:sub(2, 2) == ' ')
        status = trim(status)
        if file:sub(1, 1) == '"' then
            -- filename with a space is quoted by git
            file = file:sub(2, -2)
        end
        file = 'usr/' .. file
        if not fileExists(file) then
            if status == 'D' then
                local prev_owner = assert(file2item[file])
                if prev_owner == item then
                    log('Item %s removed %q installed by itself',
                        item, file)
                elseif isDependency(prev_owner, item, item2deps) then
                    log('Item %s removed %q installed by its follower %s',
                        item, file, prev_owner)
                else
                    log('Item %s removed %q installed by %s',
                        item, file, prev_owner)
                end
            elseif isSymlink(file) then
                log('Broken symlink: %q', file)
            else
                log('Missing file: %q', file)
            end
        elseif not isBlacklisted(file) then
            if status == 'A' then
                table.insert(new_files, file)
            elseif status == 'M' then
                table.insert(changed_files, file)
            else
                log('Strange git status: %q of %q',
                    status, file)
            end
        end
    end
    git_st:close()
    return new_files, changed_files
end

local function isValidBinary(target, file)
    local cmd = './usr/bin/%s-objdump -t %s > /dev/null 2>&1'
    return execute(cmd:format(target, file))
end

local function checkFile(file, item)
    local target, _ = parseItem(item)
    -- if it is PE32 file, it must have '.exe' in name
    local ext = file:sub(-4):lower()
    local cmd = 'file --dereference --brief %q'
    local file_type = trim(shell(cmd:format(file)))
    if ext == '.exe' then
        if not file_type:match('PE32') then
            log('File %s (%s) is %q. Remove .exe',
                file, item, file_type)
        end
    elseif ext == '.dll' then
        if not file_type:match('PE32.*DLL') then
            log('File %s (%s) is %q. Remove .dll',
                file, item, file_type)
        end
    elseif ext ~= '.bin' then
        -- .bin can be an executable or something else (font)
        if file_type:match('PE32') then
            log('File %s (%s) is %q. Add exe or dll',
                file, item, file_type)
        end
    end
    for _, t in ipairs(TARGETS) do
        if t ~= target and isInString(t, file) then
            log('File %s (%s): other target %s in name',
                file, item, t)
        end
    end
    if file:match('/lib/.*%.dll$') then
        log('File %s (%s): DLL in /lib/', file, item)
    end
    if file:match('%.dll$') or file:match('%.a$') then
        if isInString(target, file) and isCross(target) then
            -- cross-compiled
            if not isValidBinary(target, file) then
                log('File %s (%s): not recognized library',
                    file, item)
            end
        end
    end
end

local function checkFileList(files, item)
    local target, _ = parseItem(item)
    if target:match('shared') then
        local has_a, has_dll
        for _, file in ipairs(files) do
            file = file:lower()
            if file:match('%.a') then
                has_a = true
            end
            if file:match('%.dll') then
                has_dll = true
            end
        end
        if has_a and not has_dll then
            log('Shared item %s installs .a file ' ..
                'but no .dll', item)
        end
    end
end

local function removeEmptyDirs(item)
    -- removing an empty dir can reveal another one (parent)
    -- don't pass item to mute the log message
    local go_on = true
    while go_on do
        go_on = false
        local f = io.popen('find usr/* -empty -type d', 'r')
        for dir in f:lines() do
            if item then
                log("Remove empty directory %s created by %s",
                    dir, item)
            end
            os.remove(dir)
            go_on = true
        end
        f:close()
    end
end

local function prepareTree(pass, item, item2deps, prev_files, item2index)
    if pass == 'first' then
        gitCheckout(
            itemToBranch(item, pass),
            item2deps[item],
            item2index,
            pass
        )
    elseif pass == 'second' then
        -- Build item second time to check if it builds correctly if
        -- its followers and unrelated packages have been built.
        gitCheckout(
            itemToBranch(item, 'second'),
            {GIT_ALL_PSEUDOITEM},
            item2index,
            'first'
        )
        removeEmptyDirs()
        if prev_files then
            -- Remove files of item from previous build.
            for _, file in ipairs(prev_files) do
                os.remove(file)
            end
            gitAdd()
            gitCommit(("Remove %s to rebuild it"):format(item, pass))
        end
    else
        error("Unknown pass: " .. pass)
    end
end

local function comparePasses(item, new_files, prev_file2item, prev_files)
    local files_set = {}
    for _, file in ipairs(new_files) do
        if not prev_file2item[file] then
            log('Item %s installs a file on second pass only: %s',
                item, file)
        elseif prev_file2item[file] ~= item then
            log('File %s was installed by %s on first pass ' ..
                'and by %s - on the second pass',
                file, prev_file2item[file], item)
        end
        files_set[file] = true
    end
    if prev_files then
        -- prev_files is nil, if the first pass failed
        for _, file in ipairs(prev_files) do
            if not files_set[file] then
                log('Item %s installs a file on first pass only: %s',
                    item, file)
            end
        end
    end
    -- TODO compare contents of files (nm for binaries)
end

local function isBuilt(item, files)
    local target, pkg = parseItem(item)
    local INSTALLED = 'usr/%s/installed/%s'
    local installed = INSTALLED:format(target, pkg)
    for _, file in ipairs(files) do
        if file == installed then
            return true
        end
    end
    return false
end

-- builds package, returns list of new files
-- prev_files is passed only to second pass.
local function buildItem(item, item2deps, file2item, item2index, pass, prev_files)
    prepareTree(pass, item, item2deps, prev_files, item2index)
    local target, pkg = parseItem(item)
    local cmd = '%s %s MXE_TARGETS=%s --jobs=1'
    os.execute(cmd:format(tool 'make', pkg, target))
    gitAdd()
    local new_files, changed_files = gitStatus(item, item2deps, file2item)
    if #new_files + #changed_files > 0 then
        gitCommit(("Build %s, pass %s"):format(item, pass))
    end
    if pass == 'first' then
        for _, file in ipairs(new_files) do
            checkFile(file, item)
            file2item[file] = item
        end
    elseif isBuilt(item, new_files) then
        comparePasses(item, new_files, file2item, prev_files)
    end
    for _, file in ipairs(changed_files) do
        checkFile(file, item)
        -- add a dependency on a package created this file
        local creator_item = assert(file2item[file])
        if not isInArray(creator_item, item2deps[item]) then
            table.insert(item2deps[item], creator_item)
        end
        log('Item %s (pass %s) changes %s, created by %s',
            item, pass, file, creator_item)
    end
    checkFileList(concatArrays(new_files, changed_files), item)
    removeEmptyDirs(item)
    return new_files
end

local function nameToDebian(item)
    item = item:gsub('[~_]', '-')
    local name = 'mxe-%s'
    return name:format(item)
end

local function protectVersion(ver)
    ver = ver:gsub('_', '.')
    if ver:sub(1, 1):match('%d') then
        return ver
    else
        -- version number does not start with digit
        return '0.' .. ver
    end
end

local CONTROL = [[Package: %s
Version: %s
Section: devel
Priority: optional
Architecture: %s%s
Maintainer: Boris Nagaev <bnagaev@gmail.com>
Homepage: http://mxe.cc
Description: %s
 MXE (M cross environment) is a Makefile that compiles
 a cross compiler and cross compiles many free libraries
 such as SDL and Qt for various target platforms (MinGW).
 .
 %s
]]

local function debianControl(options)
    local deb_deps_str = ''
    if options.deps and #options.deps >= 1 then
        deb_deps_str = deb_deps_str ..
            '\n' .. 'Depends: ' ..
            table.concat(options.deps, ', ')
    end
    if options.recommends and #options.recommends >= 1 then
        deb_deps_str = deb_deps_str ..
            '\n' .. 'Recommends: ' ..
            table.concat(options.recommends, ', ')
    end
    local version = options.version .. '-' .. TODAY
    return CONTROL:format(
        options.package,
        version,
        options.arch,
        deb_deps_str,
        options.description1,
        options.description2
    )
end

local function makePackage(name, files, deps, ver, d1, d2, dst, recommends)
    dst = dst or '.'
    local dirname = ('%s/%s_%s'):format(dst, name,
        protectVersion(ver))
    -- make .list file
    local list_path = ('%s/%s.list'):format(dst, name)
    writeFile(list_path, table.concat(files, "\n") .. "\n")
    -- make .tar.xz file
    local tar_name = dirname .. '.tar.xz'
    local cmd1 = '%s -T %s --owner=root --group=root -cJf %s'
    os.execute(cmd1:format(tool 'tar', list_path, tar_name))
    -- update list of files back from .tar.xz (see #1067)
    local cmd2 = '%s -tf %s'
    cmd2 = cmd2:format(tool 'tar', tar_name)
    local tar_reader = io.popen(cmd2, 'r')
    local files_str = tar_reader:read('*all')
    tar_reader:close()
    writeFile(list_path, files_str)
    -- make DEBIAN/control file
    local control_text = debianControl {
        package = name,
        version = protectVersion(ver),
        arch = ARCH,
        deps = deps,
        recommends = recommends,
        description1 = d1,
        description2 = d2,
    }
    writeFile(dirname .. ".deb-control", control_text)
    if not no_debs then
        -- unpack .tar.xz to the path for Debian
        local usr = dirname .. MXE_DIR
        os.execute(('mkdir -p %s'):format(usr))
        os.execute(('mkdir -p %s/DEBIAN'):format(dirname))
        -- use tar to copy files with paths
        local cmd3 = '%s -C %s -xf %s'
        cmd3 = 'fakeroot -s deb.fakeroot ' .. cmd3
        os.execute(cmd3:format(tool 'tar', usr, tar_name))
        -- make DEBIAN/control file
        local control_fname = dirname .. '/DEBIAN/control'
        writeFile(control_fname, control_text)
        -- make .deb file
        local cmd4 = 'dpkg-deb -Zxz -b %s'
        cmd4 = 'fakeroot -i deb.fakeroot ' .. cmd4
        os.execute(cmd4:format(dirname))
        -- cleanup
        os.execute(('rm -fr %s deb.fakeroot'):format(dirname))
    end
end

local D1 = "MXE package %s for %s"
local D2 = "This package contains the files for MXE package %s"

local function makeDeb(item, files, deps, ver)
    local target, pkg = parseItem(item)
    local deb_pkg = nameToDebian(item)
    local d1 = D1:format(pkg, target)
    local d2 = D2:format(pkg)
    local deb_deps = {'mxe-requirements', 'mxe-source'}
    for _, dep in ipairs(deps) do
        table.insert(deb_deps, nameToDebian(dep))
    end
    makePackage(deb_pkg, files, deb_deps, ver, d1, d2)
end

local function findForeignInstalls(item, files)
    for _, file in ipairs(files) do
        local pattern = 'usr/([^/]+)/installed/([^/]+)'
        local t, p = file:match(pattern)
        if t and p ~= '.gitkeep' then
            local item1 = makeItem(t, p)
            if item1 ~= item then
                log('Item %s built item %s', item, item1)
            end
        end
    end
end

-- script building HUGE_TIMES from MXE main log
-- https://gist.github.com/starius/3ea9d953b0c30df88aa7
local HUGE_TIMES = {
    [7] = {"ocaml-native", "ffmpeg", "boost"},
    [9] = {"openssl", "qtdeclarative", "ossim", "wxwidgets"},
    [12] = {"ocaml-core", "itk", "wt"},
    [19] = {"gcc", "qtbase", "llvm"},
    [24] = {"vtk", "vtk6", "openscenegraph"},
    [36] = {"openblas", "pcl", "oce"},
    [51] = {"qt"},
}

local PROGRESS = "[%3d/%d] " ..
    "The build is expected to complete in %0.1f hours, " ..
    "on %s"

local function progressPrinter(items)
    local pkg2time = {}
    for time, pkgs in pairs(HUGE_TIMES) do
        for _, pkg in ipairs(pkgs) do
            pkg2time[pkg] = time
        end
    end
    --
    local started_at = os.time()
    local sums = {}
    for i, item in ipairs(items) do
        local _, pkg = parseItem(item)
        local expected_time = pkg2time[pkg] or 1
        sums[i] = (sums[i - 1] or 0) + expected_time
    end
    local total_time = sums[#sums]
    local time_done = 0
    local pkgs_done = 0
    local printer = {}
    --
    function printer.advance(_, i)
        pkgs_done = i
        time_done = sums[i]
    end
    function printer.status(_)
        local now = os.time()
        local spent = now - started_at
        local predicted_duration = spent * total_time / time_done
        local predicted_end = started_at + predicted_duration
        local predicted_end_str = os.date("%c", math.floor(predicted_end + 0.5))
        local predicted_wait = predicted_end - now
        local predicted_wait_hours = predicted_wait / 3600.0
        return PROGRESS:format(pkgs_done, #items,
             predicted_wait_hours, predicted_end_str)
    end
    return printer
end

local function isEmpty(files)
    return #files == 1
end

-- build all packages, save filelist to list file
-- prev_files is passed only to second pass.
local function buildPackages(items, item2deps, pass, prev_item2files)
    local broken = {}
    local unbroken = {}
    local file2item = {}
    local item2files = {}
    local function brokenDep(item)
        for _, dep in ipairs(item2deps[item]) do
            if broken[dep] then
                return dep
            end
        end
        return false
    end
    if pass == 'second' then
        assert(prev_item2files)
        -- fill file2item with data from prev_item2files
        for item, files in pairs(prev_item2files) do
            for _, file in ipairs(files) do
                file2item[file] = item
            end
        end
    end
    local item2index = makeItem2Index(items)
    local progress_printer = progressPrinter(items)
    for i, item in ipairs(items) do
        if not brokenDep(item) then
            local prev_files = prev_item2files and prev_item2files[item]
            local files = buildItem(
                item, item2deps, file2item, item2index, pass, prev_files
            )
            findForeignInstalls(item, files)
            if isBuilt(item, files) then
                item2files[item] = files
                table.insert(unbroken, item)
            else
                -- broken package
                broken[item] = true
                log('Item is broken: %s', item)
            end
        else
            broken[item] = true
            log('Item %s depends on broken item %s',
                item, brokenDep(item))
        end
        progress_printer:advance(i)
        echo(progress_printer:status())
    end
    return unbroken, item2files
end

local function makeDebs(items, item2deps, item2ver, item2files)
    -- start from building non-empty packages
    local to_build = {}
    for _, item in ipairs(items) do
        local files = assert(item2files[item], item)
        if not isEmpty(files) then
            table.insert(to_build, item)
        end
    end
    local built = {}
    repeat
        local missing_deps_set = {}
        for _, item in ipairs(to_build) do
            local deps = assert(item2deps[item], item)
            local ver = assert(item2ver[item], item)
            local files = assert(item2files[item], item)
            for _, dep in ipairs(deps) do
                local dep_files = item2files[dep]
                if isEmpty(dep_files) then
                    log('Item %s depends on ' ..
                        'empty item %s', item, dep)
                    missing_deps_set[dep] = true
                end
            end
            makeDeb(item, files, deps, ver)
            built[item] = true
        end
        -- empty packages built to satisfy non-empty
        to_build = {}
        for item in pairs(missing_deps_set) do
            if not built[item] then
                table.insert(to_build, item)
            end
        end
    until #to_build == 0
end

local function getMxeVersion()
    local index_html = io.open 'docs/index.html'
    local text = index_html:read('*all')
    index_html:close()
    return text:match('Release ([^<]+)')
end

local MXE_REQUIREMENTS_DESCRIPTION2 =
[[This package depends on all Debian dependencies of MXE.
 Other MXE packages depend on this package.]]

local function makeMxeRequirementsPackage(release)
    os.execute(('mkdir -p %s'):format(release))
    local name = 'mxe-requirements'
    local ver = getMxeVersion() .. release
    -- MXE build requirements should not be strict dependencies here
    -- See https://github.com/mxe/mxe/issues/1537
    local deps = {}
    local recommends = {
        'autoconf', 'automake', 'autopoint', 'bash', 'bison',
        'bzip2', 'cmake', 'flex', 'gettext', 'git', 'g++',
        'gperf', 'intltool', 'libffi-dev', 'libtool',
        'libltdl-dev', 'libssl-dev', 'libxml-parser-perl',
        'make', 'openssl', 'patch', 'perl', 'p7zip-full',
        'pkg-config', 'python', 'ruby', 'scons', 'sed',
        'unzip', 'wget', 'xz-utils',
        'g++-multilib', 'libc6-dev-i386',
    }
    if release ~= 'wheezy' then
        -- Jessie+
        table.insert(recommends, 'libtool-bin')
    end
    local dummy_name = 'mxe-requirements.dummy.' .. release
    local dummy = io.open(dummy_name, 'w')
    dummy:close()
    local files = {dummy_name}
    local d1 = "MXE requirements package"
    local d2 = MXE_REQUIREMENTS_DESCRIPTION2
    local dst = release
    makePackage(name, files, deps, ver, d1, d2, dst, recommends)
    os.remove(dummy_name)
end

local MXE_SOURCE_DESCRIPTION2 =
[[This package contains MXE source files.
 Other MXE packages depend on this package.]]

local function makeMxeSourcePackage()
    local name = 'mxe-source'
    local ver = getMxeVersion()
    -- dependencies
    local deps = {}
    local files = {
        'LICENSE.md',
        'Makefile',
        'patch.mk',
        'README.md',
        'docs',
        'ext',
        'src',
        'plugins',
        'tools',
    }
    local d1 = "MXE source"
    local d2 = MXE_SOURCE_DESCRIPTION2
    makePackage(name, files, deps, ver, d1, d2)
end

local function downloadPackages()
    local cmd = ('%s download -j 6 -k'):format(tool 'make')
    for i = 1, MAX_TRIES do
        log("Downloading packages. Attempt %d.", i)
        if execute(cmd) then
            log("All packages were downloaded.")
            return
        end
        log("Some packages failed to download.")
    end
    log("%d downloading attempts failed. Giving up.", MAX_TRIES)
    error('downloading failed')
end

local function main()
    assert(not io.open('usr/.git'), 'Remove usr/')
    local MXE_DIR_EXPECTED = '/usr/lib/mxe'
    if MXE_DIR ~= MXE_DIR_EXPECTED then
        log("Warning! Building in dir %s, not in %s",
            MXE_DIR, MXE_DIR_EXPECTED)
    end
    gitInit()
    assert(execute(("%s check-requirements MXE_TARGETS=%q"):format(
        tool 'make', table.concat(TARGETS, ' '))))
    if not max_items then
        downloadPackages()
    end
    gitAdd()
    gitCommit('Initial commit')
    gitTag(GIT_INITIAL)
    local items, item2deps, item2ver = getItems()
    local build_list = sortForBuild(items, item2deps)
    assert(isTopoOrdered(build_list, items, item2deps))
    build_list = sliceArray(build_list, max_items)
    local first_pass_failed, second_pass_failed
    local unbroken, item2files = buildPackages(
        build_list, item2deps, 'first'
    )
    if #unbroken < #build_list then
        first_pass_failed = true
    end
    gitCheckout(
        itemToBranch(GIT_ALL_PSEUDOITEM, 'first'),
        unbroken,
        makeItem2Index(build_list),
        'first'
    )
    makeDebs(unbroken, item2deps, item2ver, item2files)
    if not no_debs then
        makeMxeRequirementsPackage('wheezy')
        makeMxeRequirementsPackage('jessie')
    end
    makeMxeSourcePackage()
    if not no_second_pass then
        local unbroken_second = buildPackages(
            build_list, item2deps, 'second', item2files
        )
        if #unbroken_second < #build_list then
            second_pass_failed = true
        end
    end
    if first_pass_failed or second_pass_failed then
        local code = 1
        local close = true
        os.exit(code, close)
    end
end

main()