5 dh - debhelper command sequencer
10 use Debian::Debhelper::Dh_Lib;
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>>]
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".
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.
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
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.
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.)
48 =item B<--with> I<addon>
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.
56 =item B<--until> I<cmd>
58 Run commands in the sequence until and including I<cmd>, then stop.
60 =item B<--before> I<cmd>
62 Run commands in the sequence before I<cmd>, then stop.
64 =item B<--after> I<cmd>
66 Run commands in the sequence that come after I<cmd>.
70 Run all commands in the sequence that have yet to be run.
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
78 =head1 COMMAND SPECIFICATION
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.
85 =head1 SEQUENCE ADDONS
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:
93 =item Debian::Debhelper::Dh_Lib::insert_before(existing_command, new_command)
95 Insert I<new_command> in sequences before I<existing_command>.
97 =item Debian::Debhelper::Dh_Lib::insert_after(existing_command, new_command)
99 Insert I<new_command> in sequences after I<existing_command>.
101 =item Debian::Debhelper::Dh_Lib::remove_command(existing_command)
103 Remove I<existing_command> from the list of commands to run.
113 foreach my $i (0..$#sequence) {
114 if ($command eq $sequence[$i]) {
120 foreach my $i (0..$#sequence) {
121 if ($sequence[$i] =~ /\Q$command\E/) {
126 error "command specification \"$command\" does not match any command in the sequence"
135 To see what commands are included in a sequence, without actually doing
138 dh binary-arch --no-act
140 This is a very simple rules file, for packages where the default sequences of
141 commands work with no additional options.
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.
157 override_dh_installdocs:
158 dh_installdocs README TODO
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.
168 override_dh_auto_configure:
171 override_dh_auto_build:
172 make universe-explode-in-delight
174 Another common case is wanting to do something manually before or
175 after a particular debhelper command is run.
181 override_dh_fixperms:
183 chmod 4755 debian/foo/usr/bin/foo
185 If your package is a python package, dh will use dh_pysupport by
186 default. This is how to use dh_pycentral instead.
190 dh --with python-central
194 # Stash this away before init modifies it.
200 # Definitions of sequences.
202 $sequences{build} = [qw{
208 $sequences{clean} = [qw{
213 $sequences{install} = [@{$sequences{build}}, qw{
261 $sequences{'binary-indep'} = [@{$sequences{install}}, @b];
262 $sequences{binary} = [@{$sequences{install}}, qw{
267 $sequences{'binary-arch'} = [@{$sequences{binary}}];
269 # --with python-support is enabled by default, at least for now
270 unshift @{$dh{WITH}}, "python-support";
272 # sequence addon interface
277 foreach my $sequence (keys %sequences) {
278 my @list=@{$sequences{$sequence}};
279 next unless grep $existing, @list;
281 foreach my $command (@list) {
282 if ($command eq $existing) {
283 push @new, $new if $offset < 0;
285 push @new, $new if $offset > 0;
291 $sequences{$sequence}=\@new;
302 foreach my $sequence (keys %sequences) {
303 $sequences{$sequence}=[grep { $_ ne $command } @{$sequences{$sequence}}];
307 foreach my $addon (@{$dh{WITH}}) {
308 my $mod="Debian::Debhelper::Sequence::$addon";
312 error("--with $addon not supported or failed to load module $mod");
316 # Get the sequence of commands to run.
318 error "specify a sequence to run";
321 if ($sequence eq 'debian/rules' ||
322 $sequence =~ /^override_dh_/) {
323 # make -B causes the rules file to be run as a target
324 # and support completly empty override targets
327 elsif (! exists $sequences{$sequence}) {
328 error "Unknown sequence $sequence (choose from: ".
329 join(" ", sort keys %sequences).")";
331 my @sequence=@{$sequences{$sequence}};
333 # The list of all packages that can be acted on.
334 my @packages=@{$dh{DOPACKAGES}};
336 # Get the options to pass to commands in the sequence.
337 # Filter out options intended only for this program.
339 if ($sequence eq 'binary-arch') {
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;
346 elsif ($sequence eq 'binary-indep') {
348 # ditto optimisation for arch indep
349 my %indep_packages = map { $_ => 1 } getpackages("indep");
350 @packages = grep { $indep_packages{$_} } @packages;
353 my $opt=shift @ARGV_orig;
354 next if $opt eq $sequence;
355 if ($opt =~ /^--?(after|until|before|with)$/) {
359 elsif ($opt =~ /^--?(no-act|remaining|(after|until|before|with)=)/) {
365 # Figure out at what point in the sequence to start for each package.
368 foreach my $package (@packages) {
369 my @log=loadlog($package);
371 # Run commands in the sequence that come after the
373 $startpoint{$package}=command_pos($dh{AFTER}, @sequence) + 1;
374 # Write a dummy log entry indicating that the specified
375 # command was, in fact, run. This handles the case where
376 # no commands remain to run after it, communicating to
377 # future dh instances that the specified command should not
379 writelog($sequence[$startpoint{$package}-1], $package);
381 elsif ($dh{REMAINING}) {
382 # Start at the beginning so all remaining commands will get
384 $startpoint{$package}=0;
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;
402 # Figure out what point in the sequence to go to.
403 my $stoppoint=$#sequence;
405 $stoppoint=command_pos($dh{UNTIL}, @sequence);
407 elsif ($dh{BEFORE}) {
408 $stoppoint=command_pos($dh{BEFORE}, @sequence) - 1;
411 # Now run the commands in the sequence.
412 foreach my $i (0..$stoppoint) {
413 # Figure out which packages need to run this command.
415 foreach my $package (@packages) {
416 if ($startpoint{$package} > $i ||
417 $logged{$package}{$sequence[$i]}) {
418 push @exclude, $package;
422 if (@exclude eq @packages) {
423 # Command already done for all packages.
427 run($sequence[$i], \@packages, \@exclude, @options);
432 my @packages=@{shift()};
433 my @exclude=@{shift()};
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
443 $ENV{DH_INTERNAL_OPTIONS}=join(" ", @options);
444 $command="debian/rules";
445 @options="override_".$override_command;
448 # If some packages are excluded, add flags
449 # to prevent them from being acted on.
450 push @options, map { "-N$_" } @exclude;
453 # 3 space indent lines the command being run up under the
454 # sequence name after "dh ".
455 print " ".escape_shell($command, @options)."\n";
458 my $ret=system($command, @options);
459 if ($ret >> 8 != 0) {
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 writelog($override_command, keys %packages);
480 my $ext=pkgext($package);
483 open(LOG, "<", "debian/${ext}debhelper.log") || return;
487 $logged{$package}{$_}=1;
494 Debian::Debhelper::Dh_Lib::write_log(@_);
501 sub rules_explicit_target {
502 # Checks if a specified target exists as an explicit target
506 if (! $rules_parsed) {
507 my $processing_targets = 0;
508 my $not_a_target = 0;
509 open(MAKE, "make -Rrnpsf debian/rules debhelper-fail-me 2>/dev/null |");
511 if ($processing_targets) {
512 if (/^# Not a target:/) {
516 if (!$not_a_target && /^([^#:]+)::?/) {
518 # NOTE: if it is a depenency
519 # of .PHONY it will be
520 # defined too but that's ok.
523 # "Not a target:" is always followed by
524 # a target name, so resetting this one
528 } elsif (/^# Files$/) {
529 $processing_targets = 1;
536 return exists $targets{$target};
545 This program is a part of debhelper.
549 Joey Hess <joeyh@debian.org>