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1 #!/usr/bin/perl -w
2
3 =head1 NAME
4
5 dh - debhelper command sequencer
6
7 =cut
8
9 use strict;
10 use Debian::Debhelper::Dh_Lib;
11
12 =head1 SYNOPSIS
13
14 B<dh> sequence [B<--with> I<addon>] [B<--until> I<cmd>] [B<--before> I<cmd>] [B<--after> I<cmd>] [B<--remaining>] [S<I<debhelper options>>]
15
16 =head1 DESCRIPTION
17
18 dh runs a sequence of debhelper commands. The supported sequences
19 correspond to the targets of a debian/rules file: "build", "clean",
20 "install", "binary-arch", "binary-indep", and "binary".
21
22 Commands in the binary-indep sequence are passed the "-i" option to ensure
23 they only work on binary independent packages, and commands in the
24 binary-arch sequences are passed the "-a" option to ensure they only work
25 on architecture dependent packages.
26
27 Each debhelper command will record when it's successfully run in
28 debian/package.debhelper.log. (Which dh_clean deletes.) So dh can tell
29 which commands have already been run, for which packages, and skip running
30 those commands again.
31
32 Each time dh is run, it examines the log, and finds the last logged command
33 that is in the specified sequence. It then continues with the next command
34 in the sequence. The B<--until>, B<--before>, B<--after>, and B<--remaining>
35 options can override this behavior.
36
37 If debian/rules contains a target with a name like "override_I<dh_command>",
38 then when it gets to that command in the sequence, dh will run that
39 target from the rules file, rather than running the actual command. The
40 override target can then run the command with additional options, or run
41 entirely different commands instead. (Note that to use this feature,
42 you should Build-Depend on debhelper 7.2 or above.)
43
44 =head1 OPTIONS
45
46 =over 4
47
48 =item B<--with> I<addon>
49
50 Add the debhelper commands specified by the given addon to appropriate places
51 in the sequence of commands that is run. This option can be repeated more
52 than once, and is used when there is a third-party package that provides
53 debhelper commands. See "SEQUENCE ADDONS" below for documentation about what
54 such packages should do to be supported by --with.
55
56 =item B<--until> I<cmd>
57
58 Run commands in the sequence until and including I<cmd>, then stop.
59
60 =item B<--before> I<cmd>
61
62 Run commands in the sequence before I<cmd>, then stop.
63
64 =item B<--after> I<cmd>
65
66 Run commands in the sequence that come after I<cmd>.
67
68 =item B<--remaining>
69
70 Run all commands in the sequence that have yet to be run.
71
72 =back
73
74 All other options passed to dh are passed on to each command it runs. This
75 can be used to set an option like "-v" or "-X" or "-N", as well as for more
76 specialised options.
77
78 =head1 COMMAND SPECIFICATION
79
80 I<cmd> can be a full name of a debhelper command, or a substring. It'll first
81 search for a command in the sequence exactly matching the name, to avoid any
82 ambiguity. If there are multiple substring matches, the last one in the
83 sequence will be used.
84
85 =head1 SEQUENCE ADDONS
86
87 When B<--with> I<addon> is used, dh loads the perl module
88 Debian::Debhelper::Sequence::I<addon>. Two functions are provided to let
89 the module add its commands to sequences:
90
91 =over 4
92
93 =item Debian::Debhelper::Dh_Lib::insert_before(existing_command, new_command)
94
95 Insert I<new_command> in sequences before I<existing_command>.
96
97 =item Debian::Debhelper::Dh_Lib::insert_after(existing_command, new_command)
98
99 Insert I<new_command> in sequences after I<existing_command>.
100
101 =item Debian::Debhelper::Dh_Lib::remove_command(existing_command)
102
103 Remove I<existing_command> from the list of commands to run.
104
105 =back
106
107 =cut
108
109 sub command_pos {
110         my $command=shift;
111         my @sequence=@_;
112
113         foreach my $i (0..$#sequence) {
114                 if ($command eq $sequence[$i]) {
115                         return $i;
116                 }
117         }
118
119         my @matches;
120         foreach my $i (0..$#sequence) {
121                 if ($sequence[$i] =~ /\Q$command\E/) {
122                         push @matches, $i;
123                 }
124         }
125         if (! @matches) {
126                 error "command specification \"$command\" does not match any command in the sequence"
127         }
128         else {
129                 return pop @matches;
130         }
131 }
132
133 =head1 EXAMPLES
134
135 To see what commands are included in a sequence, without actually doing
136 anything:
137
138         dh binary-arch --no-act
139
140 This is a very simple rules file, for packages where the default sequences of
141 commands work with no additional options.
142
143         #!/usr/bin/make -f
144         %:
145                 dh $@
146
147 Often you'll want to pass an option to a specific debhelper command. The
148 easy way to do with is by adding an override target for that command.
149         
150         #!/usr/bin/make -f
151         %:
152                 dh $@
153
154         override_dh_strip:
155                 dh_strip -Xfoo
156                 
157         override_dh_installdocs:
158                 dh_installdocs README TODO
159
160 Sometimes the automated dh_auto_configure and dh_auto_build can't guess
161 what to do for a strange package. Here's how to avoid running either
162 and instead run your own commands.
163
164         #!/usr/bin/make -f
165         %:
166                 dh $@
167
168         override_dh_auto_configure:
169                 ./mondoconfig
170
171         override_dh_auto_build:
172                 make universe-explode-in-delight
173
174 Another common case is wanting to do something manually before or
175 after a particular debhelper command is run.
176
177         #!/usr/bin/make -f
178         %:
179                 dh $@
180
181         override_dh_fixperms:
182                 dh_fixperms
183                 chmod 4755 debian/foo/usr/bin/foo
184
185 =cut
186
187 # Stash this away before init modifies it.
188 my @ARGV_orig=@ARGV;
189
190 init(options => {
191         "until=s" => \$dh{UNTIL},
192         "after=s" => \$dh{AFTER},
193         "before=s" => \$dh{BEFORE},
194         "remaining" => \$dh{REMAINING},
195         "with=s" => sub {
196                 my ($option,$value)=@_;
197                 push @{$dh{WITH}},$value;
198         },
199 });
200 inhibit_log();
201
202 # Definitions of sequences.
203 my %sequences;
204 $sequences{build} = [qw{
205         dh_testdir
206         dh_auto_configure
207         dh_auto_build
208         dh_auto_test
209 }],
210 $sequences{clean} = [qw{
211         dh_testdir
212         dh_auto_clean
213         dh_clean
214 }];
215 $sequences{install} = [@{$sequences{build}}, qw{
216         dh_testroot
217         dh_prep
218         dh_installdirs
219         dh_auto_install
220
221         dh_install
222         dh_installdocs
223         dh_installchangelogs
224         dh_installexamples
225         dh_installman
226
227         dh_installcatalogs
228         dh_installcron
229         dh_installdebconf
230         dh_installcatalogs
231         dh_installemacsen
232         dh_installifupdown
233         dh_installinfo
234         dh_installinit
235         dh_installmenu
236         dh_installmime
237         dh_installmodules
238         dh_installlogcheck
239         dh_installlogrotate
240         dh_installpam
241         dh_installppp
242         dh_installudev
243         dh_installwm
244         dh_installxfonts
245         dh_lintian
246         dh_desktop
247         dh_gconf
248         dh_icons
249         dh_perl
250         dh_scrollkeeper
251         dh_usrlocal
252
253         dh_link
254         dh_compress
255         dh_fixperms
256 }];
257 my @b=qw{
258         dh_installdeb
259         dh_gencontrol
260         dh_md5sums
261         dh_builddeb
262 };
263 $sequences{'binary-indep'} = [@{$sequences{install}}, @b];
264 $sequences{binary} = [@{$sequences{install}}, qw{
265         dh_strip
266         dh_makeshlibs
267         dh_shlibdeps
268 }, @b];
269 $sequences{'binary-arch'} = [@{$sequences{binary}}];
270
271 # --with python-support is enabled by default, at least for now
272 unshift @{$dh{WITH}}, "python-support";
273
274 # sequence addon interface
275 sub _insert {
276         my $offset=shift;
277         my $existing=shift;
278         my $new=shift;
279         foreach my $sequence (keys %sequences) {
280                 my @list=@{$sequences{$sequence}};
281                 next unless grep $existing, @list;
282                 my @new;
283                 foreach my $command (@list) {
284                         if ($command eq $existing) {
285                                 push @new, $new if $offset < 0;
286                                 push @new, $command;
287                                 push @new, $new if $offset > 0;
288                         }
289                         else {
290                                 push @new, $command;
291                         }
292                 }
293                 $sequences{$sequence}=\@new;
294         }
295 }
296 sub insert_before {
297         _insert(-1, @_);
298 }
299 sub insert_after {
300         _insert(1, @_);
301 }
302 sub remove_command {
303         my $command=shift;
304         foreach my $sequence (keys %sequences) {
305                 $sequences{$sequence}=[grep { $_ ne $command } @{$sequences{$sequence}}];
306         }
307         
308 }
309 foreach my $addon (@{$dh{WITH}}) {
310         my $mod="Debian::Debhelper::Sequence::$addon";
311         $mod=~s/-/_/g;
312         eval "use $mod";
313         if ($@) {
314                 error("--with $addon not supported or failed to load module $mod");
315         }
316 }
317
318 # Get the sequence of commands to run.
319 if (! @ARGV) {
320         error "specify a sequence to run";
321 }
322 my $sequence=shift;
323 if ($sequence eq 'debian/rules') {
324         # make -B causes the rules file to be run as a target
325         exit 0
326 }       
327 elsif (! exists $sequences{$sequence}) {
328         error "Unknown sequence $sequence (choose from: ".
329                 join(" ", sort keys %sequences).")";
330 }
331 my @sequence=@{$sequences{$sequence}};
332
333 # The list of all packages that can be acted on.
334 my @packages=@{$dh{DOPACKAGES}};
335
336 # Get the options to pass to commands in the sequence.
337 # Filter out options intended only for this program.
338 my @options;
339 if ($sequence eq 'binary-arch') {
340         push @options, "-a";
341         # as an optimisation, remove from the list any packages
342         # that are not arch dependent
343         my %arch_packages = map { $_ => 1 } getpackages("arch");
344         @packages = grep { $arch_packages{$_} } @packages;
345 }
346 elsif ($sequence eq 'binary-indep') {
347         push @options, "-i";
348         # ditto optimisation for arch indep
349         my %indep_packages = map { $_ => 1 } getpackages("indep");
350         @packages = grep { $indep_packages{$_} } @packages;
351 }
352 while (@ARGV_orig) {
353         my $opt=shift @ARGV_orig;
354         next if $opt eq $sequence;
355         if ($opt =~ /^--?(after|until|before|with)$/) {
356                 shift @ARGV_orig;
357                 next;
358         }
359         elsif ($opt =~ /^--?(no-act|remaining|(after|until|before|with)=)/) {
360                 next;
361         }
362         push @options, $opt;
363 }
364
365 # Figure out at what point in the sequence to start for each package.
366 my %logged;
367 my %startpoint;
368 foreach my $package (@packages) {
369         my @log=loadlog($package);
370         if ($dh{AFTER}) {
371                 # Run commands in the sequence that come after the
372                 # specified command.
373                 $startpoint{$package}=command_pos($dh{AFTER}, @sequence) + 1;
374                 # Write a dummy log entry indicating that the specified
375                 # command was, in fact, run. This handles the case where
376                 # no commands remain to run after it, communicating to
377                 # future dh instances that the specified command should not
378                 # be run again.
379                 writelog($package, $sequence[$startpoint{$package}-1]);
380         }
381         elsif ($dh{REMAINING}) {
382                 # Start at the beginning so all remaining commands will get
383                 # run.
384                 $startpoint{$package}=0;
385         }
386         else {
387                 # Find the last logged command that is in the sequence, and
388                 # continue with the next command after it. If no logged
389                 # command is in the sequence, we're starting at the beginning..                         
390                 $startpoint{$package}=0;
391 COMMAND:        foreach my $command (reverse @log) {
392                         foreach my $i (0..$#sequence) {
393                                 if ($command eq $sequence[$i]) {
394                                         $startpoint{$package}=$i+1;
395                                         last COMMAND;
396                                 }
397                         }
398                 }
399         }
400 }
401
402 # Figure out what point in the sequence to go to.
403 my $stoppoint=$#sequence;
404 if ($dh{UNTIL}) {
405         $stoppoint=command_pos($dh{UNTIL}, @sequence);
406 }
407 elsif ($dh{BEFORE}) {
408         $stoppoint=command_pos($dh{BEFORE}, @sequence) - 1;
409 }
410
411 # Now run the commands in the sequence.
412 foreach my $i (0..$stoppoint) {
413         # Figure out which packages need to run this command.
414         my @exclude;
415         foreach my $package (@packages) {
416                 if ($startpoint{$package} > $i ||
417                     $logged{$package}{$sequence[$i]}) {
418                         push @exclude, $package;
419                 }
420         }
421         
422         if (@exclude eq @packages) {
423                 # Command already done for all packages.
424                 next;
425         }
426
427         run($sequence[$i], \@packages, \@exclude, @options);
428 }
429
430 sub run {
431         my $command=shift;
432         my @packages=@{shift()};
433         my @exclude=@{shift()};
434         my @options=@_;
435         
436         # Check for override targets in debian/rules and
437         # run them instead of running the command directly.
438         my $override_command;
439         if (rules_explicit_target("override_".$command)) {
440                 $override_command=$command;
441                 # This passes the options through to commands called
442                 # inside the target.
443                 $ENV{DH_INTERNAL_OPTIONS}=join(" ", @options);
444                 $command="debian/rules";
445                 @options="override_".$override_command;
446         }
447         else {
448                 # If some packages are excluded, add flags
449                 # to prevent them from being acted on.
450                 push @options, map { "-N$_" } @exclude;
451         }
452
453         # 3 space indent lines the command being run up under the 
454         # sequence name after "dh ".
455         print "   ".escape_shell($command, @options)."\n";
456
457         if (! $dh{NO_ACT}) {
458                 my $ret=system($command, @options);
459                 if ($ret >> 8 != 0) {
460                         exit $ret >> 8;
461                 }
462                 elsif ($ret) {
463                         exit 1;
464                 }
465
466                 if (defined $override_command) {
467                         delete $ENV{DH_INTERNAL_OPTIONS};
468                         # Need to handle logging for overriden commands here,
469                         # because the actual debhelper command may not have
470                         # been run by the rules file target.
471                         my %packages=map { $_ => 1 } @packages;
472                         map { delete $packages{$_} } @exclude;
473                         Debian::Debhelper::Dh_Lib::write_log($override_command, keys %packages);
474                 }
475         }
476 }
477
478 sub loadlog {
479         my $package=shift;
480         my $ext=pkgext($package);
481         
482         my @log;
483         open(LOG, "<", "debian/${ext}debhelper.log") || return;
484         while (<LOG>) {
485                 chomp;
486                 push @log, $_;
487                 $logged{$package}{$_}=1;
488         }
489         close LOG;
490         return @log;
491 }
492                 
493 sub writelog {
494         my $package=shift;
495         my $cmd=shift;
496         my $ext=pkgext($package);
497         
498         open(LOG, ">>", "debian/${ext}debhelper.log") || error("failed to write to log");
499         print LOG $cmd."\n";
500         close LOG;
501 }
502
503 {
504 my %targets;
505 my $rules_parsed;
506
507 sub rules_explicit_target {
508         # Checks if a specified target exists as an explicit target
509         # in debian/rules. 
510         my $target=shift;
511         
512         if (! $rules_parsed) {  
513                 my $processing_targets = 0;
514                 my $not_a_target = 0;
515                 open(MAKE, "make -Rrnpsf debian/rules debhelper-fail-me 2>/dev/null |");
516                 while (<MAKE>) {
517                         if ($processing_targets) {
518                                 if (/^# Not a target:/) {
519                                         $not_a_target = 1;
520                                 }
521                                 else {
522                                         if (!$not_a_target && /^([^#:]+)::?/) {
523                                                 # Target is defined.
524                                                 # NOTE: if it is a depenency
525                                                 # of .PHONY it will be
526                                                 # defined too but that's ok.
527                                                 $targets{$1} = 1;
528                                         }
529                                         # "Not a target:" is always followed by
530                                         # a target name, so resetting this one
531                                         # here is safe.
532                                         $not_a_target = 0;
533                                 }
534                         } elsif (/^# Files$/) {
535                                 $processing_targets = 1;
536                         }
537                 }
538                 close MAKE;
539                 $rules_parsed = 1;
540         }
541
542         return exists $targets{$target};
543 }
544
545 }
546
547 =head1 SEE ALSO
548
549 L<debhelper(7)>
550
551 This program is a part of debhelper.
552
553 =head1 AUTHOR
554
555 Joey Hess <joeyh@debian.org>
556
557 =cut