summaryrefslogtreecommitdiff
path: root/dh
blob: 3d2682685f8231353192c70a52d329d78486932d (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
#!/usr/bin/perl

=head1 NAME

dh - debhelper command sequencer

=cut

use strict;
use warnings;
use Debian::Debhelper::Dh_Lib;

our $VERSION = DH_BUILTIN_VERSION;

=head1 SYNOPSIS

B<dh> I<sequence> [B<--with> I<addon>[B<,>I<addon> ...]] [B<--list>] [S<I<debhelper options>>]

=head1 DESCRIPTION

B<dh> runs a sequence of debhelper commands. The supported I<sequence>s
correspond to the targets of a F<debian/rules> file: B<build-arch>,
B<build-indep>, B<build>, B<clean>, B<install-indep>, B<install-arch>,
B<install>, B<binary-arch>, B<binary-indep>, and B<binary>.

=head1 OVERRIDE TARGETS

A F<debian/rules> file using B<dh> can override the command that is run
at any step in a sequence, by defining an override target.

To override I<dh_command>, add a target named B<override_>I<dh_command> to
the rules file. When it would normally run I<dh_command>, B<dh> will
instead call that target. The override target can then run the command with
additional options, or run entirely different commands instead. See
examples below.

Override targets can also be defined to run only when building
architecture dependent or architecture independent packages.
Use targets with names like B<override_>I<dh_command>B<-arch>
and B<override_>I<dh_command>B<-indep>.
(Note that to use this feature, you should Build-Depend on
debhelper 8.9.7 or above.)

=head1 OPTIONS

=over 4

=item B<--with> I<addon>[B<,>I<addon> ...]

Add the debhelper commands specified by the given addon to appropriate places
in the sequence of commands that is run. This option can be repeated more
than once, or multiple addons can be listed, separated by commas.
This is used when there is a third-party package that provides
debhelper commands. See the F<PROGRAMMING> file for documentation about
the sequence addon interface.

=item B<--without> I<addon>

The inverse of B<--with>, disables using the given addon. This option
can be repeated more than once, or multiple addons to disable can be
listed, separated by commas.

=item B<--list>, B<-l>

List all available addons.

When called only with this option, B<dh> can be called from any
directory (i.e. it does not need access to files from a source
package).

=item B<--no-act>

Prints commands that would run for a given sequence, but does not run them.

Note that dh normally skips running commands that it knows will do nothing.
With --no-act, the full list of commands in a sequence is printed.

=back

Other options passed to B<dh> are passed on to each command it runs. This
can be used to set an option like B<-v> or B<-X> or B<-N>, as well as for more
specialised options.

=head1 EXAMPLES

To see what commands are included in a sequence, without actually doing
anything:

	dh binary-arch --no-act

This is a very simple rules file, for packages where the default sequences of
commands work with no additional options.

	#!/usr/bin/make -f
	%:
		dh $@

Often you'll want to pass an option to a specific debhelper command. The
easy way to do with is by adding an override target for that command.

	#!/usr/bin/make -f
	%:
		dh $@
	
	override_dh_strip:
		dh_strip -Xfoo
	
	override_dh_auto_configure:
		dh_auto_configure -- --with-foo --disable-bar

Sometimes the automated L<dh_auto_configure(1)> and L<dh_auto_build(1)>
can't guess what to do for a strange package. Here's how to avoid running
either and instead run your own commands.

	#!/usr/bin/make -f
	%:
		dh $@

	override_dh_auto_configure:
		./mondoconfig

	override_dh_auto_build:
		make universe-explode-in-delight

Another common case is wanting to do something manually before or
after a particular debhelper command is run.

	#!/usr/bin/make -f
	%:
		dh $@

	override_dh_fixperms:
		dh_fixperms
		chmod 4755 debian/foo/usr/bin/foo

Python tools are not run by dh by default, due to the continual change
in that area. Here is how to use B<dh_python2>.

	#!/usr/bin/make -f
	%:
		dh $@ --with python2

Here is how to force use of Perl's B<Module::Build> build system,
which can be necessary if debhelper wrongly detects that the package
uses MakeMaker.

	#!/usr/bin/make -f
	%:
		dh $@ --buildsystem=perl_build

Here is an example of overriding where the B<dh_auto_>I<*> commands find
the package's source, for a package where the source is located in a
subdirectory.

	#!/usr/bin/make -f
	%:
		dh $@ --sourcedirectory=src

And here is an example of how to tell the B<dh_auto_>I<*> commands to build
in a subdirectory, which will be removed on B<clean>.

	#!/usr/bin/make -f
	%:
		dh $@ --builddirectory=build

If your package can be built in parallel, please either use compat 10 or
pass B<--parallel> to dh. Then B<dpkg-buildpackage -j> will work.

	#!/usr/bin/make -f
	%:
		dh $@ --parallel

If your package cannot be built reliably while using multiple threads,
please pass B<--no-parallel> to dh (or the relevant B<dh_auto_>I<*>
command):


	#!/usr/bin/make -f
	%:
		dh $@ --no-parallel

Here is a way to prevent B<dh> from running several commands that you don't
want it to run, by defining empty override targets for each command.

	#!/usr/bin/make -f
	%:
		dh $@
	
	# Commands not to run:
	override_dh_auto_test override_dh_compress override_dh_fixperms:

A long build process for a separate documentation package can
be separated out using architecture independent overrides.
These will be skipped when running build-arch and binary-arch sequences.

	#!/usr/bin/make -f
	%:
		dh $@
	
	override_dh_auto_build-indep:
		$(MAKE) -C docs

	# No tests needed for docs
	override_dh_auto_test-indep:

	override_dh_auto_install-indep:
		$(MAKE) -C docs install

Adding to the example above, suppose you need to chmod a file, but only
when building the architecture dependent package, as it's not present
when building only documentation.

	override_dh_fixperms-arch:
		dh_fixperms
		chmod 4755 debian/foo/usr/bin/foo

=head1 INTERNALS

If you're curious about B<dh>'s internals, here's how it works under the hood.

In compat 10 (or later), B<dh> creates a stamp file
F<debian/debhelper-build-stamp> after the build step(s) are complete
to avoid re-running them.  It is possible to avoid the stamp file by
passing B<--without=build-stamp> to B<dh>.  This makes "no clean"
builds behave more like what some people expect at the expense of
possibly running the build and test twice (the second time as root or
under L<fakeroot(1)>).

Inside an override target, B<dh_*> commands will create a log file
F<debian/package.debhelper.log> to keep track of which packages the
command(s) have been run for.  These log files are then removed once
the override target is complete.

In compat 9 or earlier, each debhelper command will record
when it's successfully run in F<debian/package.debhelper.log>. (Which
B<dh_clean> deletes.) So B<dh> can tell which commands have already
been run, for which packages, and skip running those commands again.

Each time B<dh> is run (in compat 9 or earlier), it examines the log,
and finds the last logged command that is in the specified
sequence. It then continues with the next command in the sequence. The
B<--until>, B<--before>, B<--after>, and B<--remaining> options can
override this behavior (though they were removed in compat 10).

A sequence can also run dependent targets in debian/rules.  For
example, the "binary" sequence runs the "install" target.

B<dh> uses the B<DH_INTERNAL_OPTIONS> environment variable to pass information
through to debhelper commands that are run inside override targets. The
contents (and indeed, existence) of this environment variable, as the name
might suggest, is subject to change at any time.

Commands in the B<build-indep>, B<install-indep> and B<binary-indep>
sequences are passed the B<-i> option to ensure they only work on
architecture independent packages, and commands in the B<build-arch>,
B<install-arch> and B<binary-arch> sequences are passed the B<-a>
option to ensure they only work on architecture dependent packages.

=head1 DEPRECATED OPTIONS

The following options are deprecated. It's much 
better to use override targets instead.  They are B<not> available
in compat 10.

=over 4

=item B<--until> I<cmd>

Run commands in the sequence until and including I<cmd>, then stop.

=item B<--before> I<cmd>

Run commands in the sequence before I<cmd>, then stop.

=item B<--after> I<cmd>

Run commands in the sequence that come after I<cmd>.

=item B<--remaining>

Run all commands in the sequence that have yet to be run.

=back

In the above options, I<cmd> can be a full name of a debhelper command, or
a substring. It'll first search for a command in the sequence exactly
matching the name, to avoid any ambiguity. If there are multiple substring
matches, the last one in the sequence will be used.

=cut

# Stash this away before init modifies it.
my @ARGV_orig=@ARGV;

if (not compat(9, 1)) {
	# Enable autoreconf'ing by default in compat 10 or later.  Use the
	# sequence add-on so existing --without=autoreconf
	unshift(@ARGV, "--with=autoreconf");
	# Enable systemd support by default in compat 10 or later.
	# - compat 11 injects the dh_installsystemd tool directly in the
	#   sequence instead of using a --with sequence.
	unshift(@ARGV, "--with=systemd") if compat(10, 1);
	unshift(@ARGV, "--with=build-stamp");
}


inhibit_log();
		
init(options => {
		"until=s" => \$dh{UNTIL},
		"after=s" => \$dh{AFTER},
		"before=s" => \$dh{BEFORE},
		"remaining" => \$dh{REMAINING},
		"with=s" => sub {
			my ($option,$value)=@_;
			push @{$dh{WITH}},split(",", $value);
		},
		"without=s" => sub {
			my ($option,$value)=@_;
			my %without = map { $_ => 1 } split(",", $value);
			@{$dh{WITH}} = grep { ! $without{$_} } @{$dh{WITH}};
		},
		"l" => \&list_addons,
		"list" => \&list_addons,
	},
	# Disable complaints about unknown options; they are passed on to 
	# the debhelper commands.
	ignore_unknown_options => 1,
	# Bundling does not work well since there are unknown options.
	bundling => 0,
);
set_buildflags();
warn_deprecated();

# If make is using a jobserver, but it is not available
# to this process, clean out MAKEFLAGS. This avoids
# ugly warnings when calling make.
if (is_make_jobserver_unavailable()) {
	clean_jobserver_makeflags();
}

# Process the sequence parameter.
my $sequence;
if (! compat(7)) {
	# From v8, the sequence is the very first parameter.
	$sequence=shift @ARGV_orig;
	if (defined $sequence && $sequence=~/^-/) {
		error "Unknown sequence $sequence (options should not come before the sequence)";
	}
}
else {
	# Before v8, the sequence could be at any position in the parameters,
	# so was what was left after parsing.
	$sequence=shift;
	if (defined $sequence) {
		@ARGV_orig=grep { $_ ne $sequence } @ARGV_orig;
	}
}
if (! defined $sequence) {
	error "specify a sequence to run";
}
# make -B causes the rules file to be run as a target.
# Also support completely empty override targets.
# Note: it's not safe to use rules_explicit_target before this check,
# since it causes dh to be run.
my $dummy_target="debhelper-fail-me";
if ($sequence eq 'debian/rules' ||
    $sequence =~ /^override_dh_/ ||
    $sequence eq $dummy_target) {
	exit 0;
}


# Definitions of sequences.
my $build_stamp_file = 'debian/debhelper-build-stamp';
my %sequences;
my @bd_minimal = qw{
	dh_testdir
};
my @bd = (@bd_minimal, qw{
	dh_update_autotools_config
	dh_auto_configure
	dh_auto_build
	dh_auto_test
});
my @i = (qw{
	dh_testroot
	dh_prep
	dh_installdirs
	dh_auto_install

	dh_install
	dh_installdocs
	dh_installchangelogs
	dh_installexamples
	dh_installman

	dh_installcatalogs
	dh_installcron
	dh_installdebconf
	dh_installemacsen
	dh_installifupdown
	dh_installinfo
	dh_installinit
},
   (!compat(10) ? qw(dh_installsystemd) : qw()),

qw{
	dh_installmenu
	dh_installmime
	dh_installmodules
	dh_installlogcheck
	dh_installlogrotate
	dh_installpam
	dh_installppp
	dh_installudev
	dh_installgsettings
	dh_bugfiles
	dh_ucf
	dh_lintian
	dh_gconf
	dh_icons
	dh_perl
	dh_usrlocal

	dh_link
	dh_installwm
	dh_installxfonts
	dh_strip_nondeterminism
	dh_compress
	dh_fixperms
	dh_missing
});
my @ba=qw{
	dh_strip
	dh_makeshlibs
	dh_shlibdeps
};
if (! getpackages("arch")) {
	@ba=();
}
my @b=qw{
	dh_installdeb
	dh_gencontrol
	dh_md5sums
	dh_builddeb
};
$sequences{clean} = [@bd_minimal, qw{
	dh_auto_clean
	dh_clean
}];
$sequences{'build-indep'} = [@bd];
$sequences{'build-arch'} = [@bd];
if (! compat(8)) {
	# From v9, sequences take standard rules targets into account.
	$sequences{build} = [@bd_minimal, rules("build-arch"), rules("build-indep")];
	$sequences{'install-indep'} = [rules("build-indep"), @i];
	$sequences{'install-arch'} = [rules("build-arch"), @i];
	$sequences{'install'} = [rules("build"), rules("install-arch"), rules("install-indep")];
	$sequences{'binary-indep'} = [rules("install-indep"), @b];
	$sequences{'binary-arch'} = [rules("install-arch"), @ba, @b];
	$sequences{binary} = [rules("install"), rules("binary-arch"), rules("binary-indep")];
}
else {
	$sequences{build} = [@bd];
	$sequences{'install'} = [@{$sequences{build}}, @i];
	$sequences{'install-indep'} = [@{$sequences{'build-indep'}}, @i];
	$sequences{'install-arch'} = [@{$sequences{'build-arch'}}, @i];
	$sequences{binary} = [@{$sequences{install}}, @ba, @b];
	$sequences{'binary-indep'} = [@{$sequences{'install-indep'}}, @b];
	$sequences{'binary-arch'} = [@{$sequences{'install-arch'}}, @ba, @b];
}

# Additional command options
my %command_opts;

# sequence addon interface
sub _insert {
	my ($offset, $existing, $new) = @_;
	foreach my $sequence (keys %sequences) {
		my @list=@{$sequences{$sequence}};
		next unless grep $existing, @list;
		my @new;
		foreach my $command (@list) {
			if ($command eq $existing) {
				push @new, $new if $offset < 0;
				push @new, $command;
				push @new, $new if $offset > 0;
			}
			else {
				push @new, $command;
			}
		}
		$sequences{$sequence}=\@new;
	}
}
sub insert_before {
	_insert(-1, @_);
}
sub insert_after {
	_insert(1, @_);
}
sub remove_command {
	my ($command) = @_;
	foreach my $sequence (keys %sequences) {
		$sequences{$sequence}=[grep { $_ ne $command } @{$sequences{$sequence}}];
	}
	
}
sub add_command {
	my ($command, $sequence) = @_;
	unshift @{$sequences{$sequence}}, $command;
}
sub add_command_at_end {
	my ($command, $sequence) = @_;
	push(@{$sequences{$sequence}}, $command);
}
sub add_command_options {
	my $command=shift;
	push @{$command_opts{$command}}, @_;
}
sub remove_command_options {
	my ($command, @cmd_options) = @_;
	if (@cmd_options) {
		# Remove only specified options
		if (my $opts = $command_opts{$command}) {
			foreach my $opt (@cmd_options) {
				$opts = [ grep { $_ ne $opt } @$opts ];
			}
			$command_opts{$command} = $opts;
		}
	}
	else {
		# Clear all additional options
		delete $command_opts{$command};
	}
}

sub list_addons {
	my %addons;

	for my $inc (@INC) {
		require File::Spec;
		my $path = File::Spec->catdir($inc, "Debian/Debhelper/Sequence");
		if (-d $path) {
			for my $module_path (glob "$path/*.pm") {
				my $name = basename($module_path);
				$name =~ s/\.pm$//;
				$name =~ s/_/-/g;
				$addons{$name} = 1;
			}
		}
	}

	for my $name (sort keys %addons) {
		print "$name\n";
	}

	exit 0;
}

# Load addons, which can modify sequences.
foreach my $addon (@{$dh{WITH}}) {
	my $mod="Debian::Debhelper::Sequence::$addon";
	$mod=~s/-/_/g;
	eval "use $mod";
	if ($@) {
		error("unable to load addon $addon: $@");
	}
}

if (! exists $sequences{$sequence}) {
	error "Unknown sequence $sequence (choose from: ".
		join(" ", sort keys %sequences).")";
}
my @sequence=optimize_sequence(@{$sequences{$sequence}});

# The list of all packages that can be acted on.
my @packages=@{$dh{DOPACKAGES}};

# Get the options to pass to commands in the sequence.
# Filter out options intended only for this program.
my @options;
my $user_specified_options=0;
my $build_system_options = 0;
if ($sequence eq 'build-arch' ||
    $sequence eq 'install-arch' ||
    $sequence eq 'binary-arch') {
	push @options, "-a";
	# as an optimisation, remove from the list any packages
	# that are not arch dependent
	my %arch_packages = map { $_ => 1 } getpackages("arch");
	@packages = grep { $arch_packages{$_} } @packages;
}
elsif ($sequence eq 'build-indep' ||
       $sequence eq 'install-indep' ||
       $sequence eq 'binary-indep') {
	push @options, "-i";
	# ditto optimisation for arch indep
	my %indep_packages = map { $_ => 1 } getpackages("indep");
	@packages = grep { $indep_packages{$_} } @packages;
}
while (@ARGV_orig) {
	my $opt=shift @ARGV_orig;
	if ($opt =~ /^--?(after|until|before|with|without)$/) {
		shift @ARGV_orig;
		next;
	}
	elsif ($opt =~ /^--?(no-act|remaining|(after|until|before|with|without)=)/) {
		next;
	}
	elsif ($opt=~/^-/) {
		if (not @options and $opt eq '--parallel' or $opt eq '--no-parallel') {
			my $max_parallel;
			# Ignore the option if it is the default for the given
			# compat level.
			next if compat(9) and $opt eq '--no-parallel';
			next if not compat(9) and $opt eq '--parallel';
			# Having an non-empty "@options" hurts performance quite a
			# bit.  At the same time, we want to promote the use of
			# --(no-)parallel, so "tweak" the options a bit if there
			# is no reason to include this option.
			$max_parallel = get_buildoption('parallel') // 1;
			next if $max_parallel == 1;
		}
		push @options, "-O".$opt;
		$build_system_options = 1 if $opt ne '--no-parallel' and $opt ne '--parallel';
		$user_specified_options=1
			unless $opt =~ /^--((?:no-)?parallel|buildsystem|sourcedirectory|builddirectory|)/;
	}
	elsif (@options) {
		$user_specified_options=1;
		if ($options[$#options]=~/^-O--/) {
			$options[$#options].="=".$opt;
		}
		else {
			$options[$#options].=$opt;
		}
	}
	else {
		error "Unknown parameter: $opt";
	}
}

# Figure out at what point in the sequence to start for each package.
my %logged;
my %startpoint;
my %stamp_file;

if ( -f $build_stamp_file) {
	open(my $fd, '<', $build_stamp_file) or error("open($build_stamp_file, ro) failed: $!");
	while (my $line = <$fd>) {
		chomp($line);
		$stamp_file{$line} = 1;
	}
	close($fd);
}

# Lazy cache of the result of optimize_sequence on the "build"
# sequence
my $optimized_build_seq;
foreach my $package (@packages) {
	my @log;
	if (compat(9)) {
		@log = load_log($package, \%logged);
	} elsif (exists($stamp_file{$package})) {
		if (not defined($optimized_build_seq)) {
			# Expand "build" so we can accurately filter out
			# everything (admittedly, it is bit of an over
			# approximation)
			# Related bug: #851071
			my @seq = optimize_sequence(@{$sequences{'build'}});
			$optimized_build_seq = \@seq;
		}
		@log = @{$optimized_build_seq};
		# We do not need %logged in compat 10
	}
	if ($dh{AFTER}) {
		# Run commands in the sequence that come after the
		# specified command.
		$startpoint{$package}=command_pos($dh{AFTER}, @sequence) + 1;
		# Write a dummy log entry indicating that the specified
		# command was, in fact, run. This handles the case where
		# no commands remain to run after it, communicating to
		# future dh instances that the specified command should not
		# be run again.
		write_log($sequence[$startpoint{$package}-1], $package);
	}
	elsif ($dh{REMAINING}) {
		# Start at the beginning so all remaining commands will get
		# run.
		$startpoint{$package}=0;
	}
	else {
		# Find the last logged command that is in the sequence, and
		# continue with the next command after it. If no logged
		# command is in the sequence, we're starting at the beginning.. 			
		$startpoint{$package}=0;
COMMAND:	foreach my $command (reverse @log) {
			foreach my $i (0..$#sequence) {
				if ($command eq $sequence[$i]) {
					$startpoint{$package}=$i+1;
					last COMMAND;
				}
			}
		}
	}
}

# Figure out what point in the sequence to go to.
my $stoppoint=$#sequence;
if ($dh{UNTIL}) {
	$stoppoint=command_pos($dh{UNTIL}, @sequence);
}
elsif ($dh{BEFORE}) {
	$stoppoint=command_pos($dh{BEFORE}, @sequence) - 1;
}

# Now run the commands in the sequence.
foreach my $i (0..$stoppoint) {
	my $command=$sequence[$i];

	# Figure out which packages need to run this command.
	my @todo;
	my @opts=@options;
	foreach my $package (@packages) {
		if ($startpoint{$package} > $i ||
		    $logged{$package}{$sequence[$i]}) {
			push @opts, "-N$package";
		}
		else {
			push @todo, $package;
		}
	}
	next unless @todo;

	my $rules_target = rules_target($command);
	if (defined $rules_target) {
		# Don't pass DH_ environment variables, since this is
		# a fresh invocation of debian/rules and any sub-dh commands.
		delete $ENV{DH_INTERNAL_OPTIONS};
		delete $ENV{DH_INTERNAL_OVERRIDE};
		run("debian/rules", $rules_target);
		next;
	}
	if (my $stamp_file = stamp_target($command)) {
		my %seen;
		print "   create-stamp ".escape_shell($stamp_file)."\n";

		next if $dh{NO_ACT};
		open(my $fd, '+>>', $stamp_file) or error("open($stamp_file, rw) failed: $!");
		# Seek to the beginning
		seek($fd, 0, 0) or error("seek($stamp_file) failed: $!");
		while (my $line = <$fd>) {
			chomp($line);
			$seen{$line} = 1;
		}
		for my $pkg (grep { not exists $seen{$_} } @todo) {
			print {$fd} "$pkg\n";
		}
		close($fd) or error("close($stamp_file) failed: $!");
		next;
	}
	
	# Check for override targets in debian/rules, and run instead of
	# the usual command. (The non-arch-specific override is tried first,
	# for simplest semantics; mixing it with arch-specific overrides
	# makes little sense.)
	my @oldtodo=@todo;
	foreach my $override_type (undef, "arch", "indep") {
		@todo = run_override($override_type, $command, \@todo, @opts);
	}
	next unless @todo;

	if (can_skip($command, @todo) && ! $dh{NO_ACT}) {
		# This mkdir is to avoid skipping the command causing
		# breakage if some later command assumed that the
		# command ran, and created the tmpdir, as a side effect.
		# No commands in debhelper should make such an assuption,
		# but there may be third party commands or other things
		# in the rules file that does.
		if (! compat(10)) {
			foreach my $package (@todo) {
				mkdir(tmpdir($package));
			}
		}
		next;
	}

	# No need to run the command for any packages handled by the
	# override targets.
	my %todo=map { $_ => 1 } @todo;
	foreach my $package (@oldtodo) {
		if (! $todo{$package}) {
			push @opts, "-N$package";
		}
	}

	run($command, @opts);
}

sub run {
	my ($command, @options) = @_;

	# Include additional command options if any
	unshift @options, @{$command_opts{$command}}
		if exists $command_opts{$command};

	# 3 space indent lines the command being run up under the
	# sequence name after "dh ".
	if (!$dh{QUIET}) {
		print "   ".escape_shell($command, @options)."\n";
	}

	return if $dh{NO_ACT};

	my $ret=system { $command } $command, @options;
	if ($ret >> 8 != 0) {
		exit $ret >> 8;
	}
	elsif ($ret) {
		exit 1;
	}
}

# Tries to run an override target for a command. Returns the list of
# packages that it was unable to run an override target for.
sub run_override {
	my ($override_type, $command, $packages, @options) = @_;

	my $override="override_$command".
		(defined $override_type ? "-".$override_type : "");

	# Check which packages are of the right architecture for the
	# override_type.
	my (@todo, @rest);
	my $has_explicit_target = rules_explicit_target($override);

	if (defined $override_type) {
		foreach my $package (@{$packages}) {
			my $isall=package_is_arch_all($package);
			if (($override_type eq 'indep' && $isall) ||
				($override_type eq 'arch' && !$isall)) {
				push @todo, $package;
			} else {
				push @rest, $package;
				push @options, "-N$package";
			}
		}
	}
	else {
		@todo=@{$packages};
	}

	return @{$packages} unless defined $has_explicit_target; # no such override
	return @rest if ! $has_explicit_target; # has empty override
	return @rest unless @todo; # has override, but no packages to act on

	if (defined $override_type) {
		# Ensure appropriate -a or -i option is passed when running
		# an arch-specific override target.
		my $opt=$override_type eq "arch" ? "-a" : "-i";
		push @options, $opt unless grep { $_ eq $opt } @options;
	}

	# Discard any override log files before calling the override
	# target
	if (not compat(9)) {
		my @files = glob('debian/*.debhelper.log');
		rm_files(@files) if @files;
	}
	# This passes the options through to commands called
	# inside the target.
	$ENV{DH_INTERNAL_OPTIONS}=join("\x1e", @options);
	$ENV{DH_INTERNAL_OVERRIDE}=$command;
	run("debian/rules", $override);
	delete $ENV{DH_INTERNAL_OPTIONS};
	delete $ENV{DH_INTERNAL_OVERRIDE};

	# Update log for overridden command now that it has
	# finished successfully.
	# (But avoid logging for dh_clean since it removes
	# the log earlier.)
	if (! $dh{NO_ACT} && $command ne 'dh_clean' && compat(9)) {
		write_log($command, @todo);
		commit_override_log(@todo);
	}

	# Override targets may introduce new helper files.  Strictly
	# speaking this *shouldn't* be necessary, but lets make no
	# assumptions.
	Debian::Debhelper::Dh_Lib::dh_clear_unsafe_cache();

	return @rest;
}

sub optimize_sequence {
	my (@commands) = @_;
	my (@sequence, %seen);
	my $add=sub {
		# commands can appear multiple times when sequences are
		# inlined together; only the first should be needed
		my $command=shift;
		if (! $seen{$command}) {
			$seen{$command}=1;
			push @sequence, $command;
		}
	};
	foreach my $command (@commands) {
		my $rules_target=rules_target($command);
		if (defined $rules_target &&
		    ! defined rules_explicit_target($rules_target)) {
			# inline the sequence for this implicit target
			$add->($_) foreach optimize_sequence(@{$sequences{$rules_target}});
		}
		else {
			$add->($command);
		}
	}
	return @sequence;
}

sub rules_target {
	my ($command) = @_;
	if ($command =~ /^debian\/rules\s+(.*)/) {
		return $1
	}
	else {
		return undef;
	}
}

sub stamp_target {
	my ($command) = @_;
	if ($command =~ s/^create-stamp\s+//) {
		return $command;
	}
	return;
}

sub rules {
	return "debian/rules ".join(" ", @_);
}

{
my %targets;
my $rules_parsed;

sub rules_explicit_target {
	# Checks if a specified target exists as an explicit target
	# in debian/rules.
	# undef is returned if target does not exist, 0 if target is noop
	# and 1 if target has dependencies or executes commands.
	my ($target) = @_;

	if (! $rules_parsed) {
		my $processing_targets = 0;
		my $not_a_target = 0;
		my $current_target;
		open(MAKE, "LC_ALL=C make -Rrnpsf debian/rules $dummy_target 2>/dev/null |");
		while (<MAKE>) {
			if ($processing_targets) {
				if (/^# Not a target:/) {
					$not_a_target = 1;
				}
				else {
					if (!$not_a_target && /^([^#:]+)::?\s*(.*)$/) {
						# Target is defined. NOTE: if it is a dependency of
						# .PHONY it will be defined too but that's ok.
						# $2 contains target dependencies if any.
						$current_target = $1;
						$targets{$current_target} = ($2) ? 1 : 0;
					}
					else {
						if (defined $current_target) {
							if (/^#/) {
								# Check if target has commands to execute
								if (/^#\s*(commands|recipe) to execute/) {
									$targets{$current_target} = 1;
								}
							}
							else {
								# Target parsed.
								$current_target = undef;
							}
						}
					}
					# "Not a target:" is always followed by
					# a target name, so resetting this one
					# here is safe.
					$not_a_target = 0;
				}
			}
			elsif (/^# Files$/) {
				$processing_targets = 1;
			}
		}
		close MAKE;
		$rules_parsed = 1;
	}

	return $targets{$target};
}

}

sub warn_deprecated {
	foreach my $deprecated ('until', 'after', 'before', 'remaining') {
		if (defined $dh{uc $deprecated}) {
			if (compat(9)) {
				warning("The --$deprecated option is deprecated. Use override targets instead.");
			} else {
				error("The --$deprecated option is not supported in compat 10+. Use override targets instead.");
			}
		}
	}
}

sub command_pos {
	my ($command, @sequence) = @_;

	foreach my $i (0..$#sequence) {
		if ($command eq $sequence[$i]) {
			return $i;
		}
	}

	my @matches;
	foreach my $i (0..$#sequence) {
		if ($sequence[$i] =~ /\Q$command\E/) {
			push @matches, $i;
		}
	}
	if (! @matches) {
		error "command specification \"$command\" does not match any command in the sequence"
	}
	else {
		return pop @matches;
	}
}

my %skipinfo;
sub can_skip {
	my ($command, @packages) = @_;

	return 0 if $user_specified_options ||
		(exists $ENV{DH_OPTIONS} && length $ENV{DH_OPTIONS});

	if (! defined $skipinfo{$command}) {
		$skipinfo{$command}=[extract_skipinfo($command)];
	}
	my @skipinfo=@{$skipinfo{$command}};
	return 0 unless @skipinfo;
	return 1 if scalar(@skipinfo) == 1 and $skipinfo[0] eq 'always-skip';
	my $all_pkgs;

	foreach my $skipinfo (@skipinfo) {
		if ($skipinfo=~/^([a-zA-Z0-9-_]+)\((.*)\)$/) {
			my $type = $1;
			my $need = $2;
			if ($type eq 'tmp') {
				foreach my $package (@packages) {
					my $tmp = tmpdir($package);
					return 0 if -e "$tmp/$need";
				}
			} elsif ($type eq 'pkgfile' or $type eq 'pkgfile-logged') {
				my $pkgs;
				if ($type eq 'pkgfile') {
					$pkgs = \@packages;
				} else {
					$all_pkgs //= [getpackages()];
					$pkgs = $all_pkgs;
				}
				# Use the secret bulk check call
				return 0 if pkgfile($pkgs, $need) ne '';
			} elsif ($type eq 'buildsystem') {
				# If there are any buildsystem options, we assume that
				# the build needs a buildsystem.
				return 0 if $build_system_options;
				require Debian::Debhelper::Dh_Buildsystems;
				my $system = Debian::Debhelper::Dh_Buildsystems::load_buildsystem(undef, $need);
				return 0 if defined($system);
			} else {
				# Unknown hint - make no assumptions
				return 0;
			}
		} else {
			# Use the secret bulk check call
			return 0 if pkgfile(\@packages, $skipinfo) ne '';
		}
	}
	return 1;
}

sub extract_skipinfo {
	my ($command) = @_;

	foreach my $dir (split (':', $ENV{PATH})) {
		if (open (my $h, "<", "$dir/$command")) {
			while (<$h>) {
				if (m/PROMISE: DH NOOP( WITHOUT\s+(.*))?\s*$/) {
					close $h;
					return split(' ', $2) if defined($2);
					return ('always-skip');
				}
			}
			close $h;
			return ();
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut