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#!/usr/bin/perl -w
#
# Library functions for debhelper programs, perl version.
#
# Joey Hess, GPL copyright 1997-2008.
package Debian::Debhelper::Dh_Lib;
use strict;
use Exporter;
use vars qw(@ISA @EXPORT %dh);
@ISA=qw(Exporter);
@EXPORT=qw(&init &doit &complex_doit &verbose_print &error &warning &tmpdir
&pkgfile &pkgext &pkgfilename &isnative &autoscript &filearray
&filedoublearray &getpackages &basename &dirname &xargs %dh
&compat &addsubstvar &delsubstvar &excludefile &package_arch
&is_udeb &udeb_filename &debhelper_script_subst &escape_shell
&inhibit_log &load_log &write_log &commit_override_log
&dpkg_architecture_value &sourcepackage
&is_make_jobserver_unavailable &clean_jobserver_makeflags
&cross_command &set_buildflags &get_buildoption);
my $max_compat=10;
# The Makefile changes this if debhelper is installed in a PREFIX.
my $prefix="/usr";
sub init {
my %params=@_;
# Check to see if an option line starts with a dash,
# or DH_OPTIONS is set.
# If so, we need to pass this off to the resource intensive
# Getopt::Long, which I'd prefer to avoid loading at all if possible.
if ((defined $ENV{DH_OPTIONS} && length $ENV{DH_OPTIONS}) ||
(defined $ENV{DH_INTERNAL_OPTIONS} && length $ENV{DH_INTERNAL_OPTIONS}) ||
grep /^-/, @ARGV) {
eval "use Debian::Debhelper::Dh_Getopt";
error($@) if $@;
Debian::Debhelper::Dh_Getopt::parseopts(%params);
}
# Another way to set excludes.
if (exists $ENV{DH_ALWAYS_EXCLUDE} && length $ENV{DH_ALWAYS_EXCLUDE}) {
push @{$dh{EXCLUDE}}, split(":", $ENV{DH_ALWAYS_EXCLUDE});
}
# Generate EXCLUDE_FIND.
if ($dh{EXCLUDE}) {
$dh{EXCLUDE_FIND}='';
foreach (@{$dh{EXCLUDE}}) {
my $x=$_;
$x=escape_shell($x);
$x=~s/\./\\\\./g;
$dh{EXCLUDE_FIND}.="-regex .\\*$x.\\* -or ";
}
$dh{EXCLUDE_FIND}=~s/ -or $//;
}
# Check to see if DH_VERBOSE environment variable was set, if so,
# make sure verbose is on.
if (defined $ENV{DH_VERBOSE} && $ENV{DH_VERBOSE} ne "") {
$dh{VERBOSE}=1;
}
# Check to see if DH_NO_ACT environment variable was set, if so,
# make sure no act mode is on.
if (defined $ENV{DH_NO_ACT} && $ENV{DH_NO_ACT} ne "") {
$dh{NO_ACT}=1;
}
# Get the name of the main binary package (first one listed in
# debian/control). Only if the main package was not set on the
# command line.
if (! exists $dh{MAINPACKAGE} || ! defined $dh{MAINPACKAGE}) {
my @allpackages=getpackages();
$dh{MAINPACKAGE}=$allpackages[0];
}
# Check if packages to build have been specified, if not, fall back to
# the default, building all relevant packages.
if (! defined $dh{DOPACKAGES} || ! @{$dh{DOPACKAGES}}) {
push @{$dh{DOPACKAGES}}, getpackages('both');
}
# Check to see if -P was specified. If so, we can only act on a single
# package.
if ($dh{TMPDIR} && $#{$dh{DOPACKAGES}} > 0) {
error("-P was specified, but multiple packages would be acted on (".join(",",@{$dh{DOPACKAGES}}).").");
}
# Figure out which package is the first one we were instructed to build.
# This package gets special treatement: files and directories specified on
# the command line may affect it.
$dh{FIRSTPACKAGE}=${$dh{DOPACKAGES}}[0];
# If no error handling function was specified, just propagate
# errors out.
if (! exists $dh{ERROR_HANDLER} || ! defined $dh{ERROR_HANDLER}) {
$dh{ERROR_HANDLER}='exit \$?';
}
}
# Run at exit. Add the command to the log files for the packages it acted
# on, if it's exiting successfully.
my $write_log=1;
sub END {
if ($? == 0 && $write_log) {
write_log(basename($0), @{$dh{DOPACKAGES}});
}
}
sub logfile {
my $package=shift;
my $ext=pkgext($package);
return "debian/${ext}debhelper.log"
}
sub add_override {
my $line=shift;
$line="override_$ENV{DH_INTERNAL_OVERRIDE} $line"
if defined $ENV{DH_INTERNAL_OVERRIDE};
return $line;
}
sub remove_override {
my $line=shift;
$line=~s/^\Qoverride_$ENV{DH_INTERNAL_OVERRIDE}\E\s+//
if defined $ENV{DH_INTERNAL_OVERRIDE};
return $line;
}
sub load_log {
my ($package, $db)=@_;
my @log;
open(LOG, "<", logfile($package)) || return;
while (<LOG>) {
chomp;
my $command=remove_override($_);
push @log, $command;
$db->{$package}{$command}=1 if defined $db;
}
close LOG;
return @log;
}
sub write_log {
my $cmd=shift;
my @packages=@_;
return if $dh{NO_ACT};
foreach my $package (@packages) {
my $log=logfile($package);
open(LOG, ">>", $log) || error("failed to write to ${log}: $!");
print LOG add_override($cmd)."\n";
close LOG;
}
}
sub commit_override_log {
my @packages=@_;
return if $dh{NO_ACT};
foreach my $package (@packages) {
my @log=map { remove_override($_) } load_log($package);
my $log=logfile($package);
open(LOG, ">", $log) || error("failed to write to ${log}: $!");
print LOG $_."\n" foreach @log;
close LOG;
}
}
sub inhibit_log {
$write_log=0;
}
# Pass it an array containing the arguments of a shell command like would
# be run by exec(). It turns that into a line like you might enter at the
# shell, escaping metacharacters and quoting arguments that contain spaces.
sub escape_shell {
my @args=@_;
my $line="";
my @ret;
foreach my $word (@args) {
if ($word=~/\s/) {
# Escape only a few things since it will be quoted.
# Note we use double quotes because you cannot
# escape ' in single quotes, while " can be escaped
# in double.
# This does make -V"foo bar" turn into "-Vfoo bar",
# but that will be parsed identically by the shell
# anyway..
$word=~s/([\n`\$"\\])/\\$1/g;
push @ret, "\"$word\"";
}
else {
# This list is from _Unix in a Nutshell_. (except '#')
$word=~s/([\s!"\$()*+#;<>?@\[\]\\`|~])/\\$1/g;
push @ret,$word;
}
}
return join(' ', @ret);
}
# Run a command, and display the command to stdout if verbose mode is on.
# All commands that modifiy files in $TMP should be ran via this
# function.
#
# Note that this cannot handle complex commands, especially anything
# involving redirection. Use complex_doit instead.
sub doit {
verbose_print(escape_shell(@_));
if (! $dh{NO_ACT}) {
system(@_) == 0 || _error_exitcode(join(" ", @_));
}
}
# Run a command and display the command to stdout if verbose mode is on.
# Use doit() if you can, instead of this function, because this function
# forks a shell. However, this function can handle more complicated stuff
# like redirection.
sub complex_doit {
verbose_print(join(" ",@_));
if (! $dh{NO_ACT}) {
# The join makes system get a scalar so it forks off a shell.
system(join(" ", @_)) == 0 || _error_exitcode(join(" ", @_))
}
}
sub _error_exitcode {
my $command=shift;
if ($? == -1) {
error("$command failed to to execute: $!");
}
elsif ($? & 127) {
error("$command died with signal ".($? & 127));
}
else {
error("$command returned exit code ".($? >> 8));
}
}
# Run a command that may have a huge number of arguments, like xargs does.
# Pass in a reference to an array containing the arguments, and then other
# parameters that are the command and any parameters that should be passed to
# it each time.
sub xargs {
my $args=shift;
# The kernel can accept command lines up to 20k worth of characters.
my $command_max=20000; # LINUX SPECIFIC!!
# (And obsolete; it's bigger now.)
# I could use POSIX::ARG_MAX, but that would be slow.
# Figure out length of static portion of command.
my $static_length=0;
foreach (@_) {
$static_length+=length($_)+1;
}
my @collect=();
my $length=$static_length;
foreach (@$args) {
if (length($_) + 1 + $static_length > $command_max) {
error("This command is greater than the maximum command size allowed by the kernel, and cannot be split up further. What on earth are you doing? \"@_ $_\"");
}
$length+=length($_) + 1;
if ($length < $command_max) {
push @collect, $_;
}
else {
doit(@_,@collect) if $#collect > -1;
@collect=($_);
$length=$static_length + length($_) + 1;
}
}
doit(@_,@collect) if $#collect > -1;
}
# Print something if the verbose flag is on.
sub verbose_print {
my $message=shift;
if ($dh{VERBOSE}) {
print "\t$message\n";
}
}
# Output an error message and die (can be caught).
sub error {
my $message=shift;
die basename($0).": $message\n";
}
# Output a warning.
sub warning {
my $message=shift;
print STDERR basename($0).": $message\n";
}
# Returns the basename of the argument passed to it.
sub basename {
my $fn=shift;
$fn=~s/\/$//g; # ignore trailing slashes
$fn=~s:^.*/(.*?)$:$1:;
return $fn;
}
# Returns the directory name of the argument passed to it.
sub dirname {
my $fn=shift;
$fn=~s/\/$//g; # ignore trailing slashes
$fn=~s:^(.*)/.*?$:$1:;
return $fn;
}
# Pass in a number, will return true iff the current compatibility level
# is less than or equal to that number.
{
my $warned_compat=0;
my $c;
sub compat {
my $num=shift;
my $nowarn=shift;
if (! defined $c) {
$c=1;
if (-e 'debian/compat') {
open (COMPAT_IN, "debian/compat") || error "debian/compat: $!";
my $l=<COMPAT_IN>;
close COMPAT_IN;
if (! defined $l || ! length $l) {
warning("debian/compat is empty, assuming level $c")
unless defined $ENV{DH_COMPAT};
}
else {
chomp $l;
$c=$l;
}
}
else {
warning("No compatibility level specified in debian/compat");
warning("This package will soon FTBFS; time to fix it!");
}
if (defined $ENV{DH_COMPAT}) {
$c=$ENV{DH_COMPAT};
}
}
if ($c <= 4 && ! $warned_compat && ! $nowarn) {
warning("Compatibility levels before 5 are deprecated (level $c in use)");
$warned_compat=1;
}
if ($c > $max_compat) {
error("Sorry, but $max_compat is the highest compatibility level supported by this debhelper.");
}
return ($c <= $num);
}
}
# Pass it a name of a binary package, it returns the name of the tmp dir to
# use, for that package.
sub tmpdir {
my $package=shift;
if ($dh{TMPDIR}) {
return $dh{TMPDIR};
}
elsif (compat(1) && $package eq $dh{MAINPACKAGE}) {
# This is for back-compatibility with the debian/tmp tradition.
return "debian/tmp";
}
else {
return "debian/$package";
}
}
# Pass this the name of a binary package, and the name of the file wanted
# for the package, and it will return the actual existing filename to use.
#
# It tries several filenames:
# * debian/package.filename.buildarch
# * debian/package.filename.buildos
# * debian/package.filename
# * debian/filename (if the package is the main package)
# If --name was specified then the files
# must have the name after the package name:
# * debian/package.name.filename.buildarch
# * debian/package.name.filename.buildos
# * debian/package.name.filename
# * debian/name.filename (if the package is the main package)
sub pkgfile {
my $package=shift;
my $filename=shift;
if (defined $dh{NAME}) {
$filename="$dh{NAME}.$filename";
}
# First, check for files ending in buildarch and buildos.
my $match;
foreach my $file (glob("debian/$package.$filename.*")) {
next if ! -f $file;
next if $dh{IGNORE} && exists $dh{IGNORE}->{$file};
if ($file eq "debian/$package.$filename.".buildarch()) {
$match=$file;
# buildarch files are used in preference to buildos files.
last;
}
elsif ($file eq "debian/$package.$filename.".buildos()) {
$match=$file;
}
}
return $match if defined $match;
my @try=("debian/$package.$filename");
if ($package eq $dh{MAINPACKAGE}) {
push @try, "debian/$filename";
}
foreach my $file (@try) {
if (-f $file &&
(! $dh{IGNORE} || ! exists $dh{IGNORE}->{$file})) {
return $file;
}
}
return "";
}
# Pass it a name of a binary package, it returns the name to prefix to files
# in debian/ for this package.
sub pkgext {
my $package=shift;
if (compat(1) and $package eq $dh{MAINPACKAGE}) {
return "";
}
return "$package.";
}
# Pass it the name of a binary package, it returns the name to install
# files by in eg, etc. Normally this is the same, but --name can override
# it.
sub pkgfilename {
my $package=shift;
if (defined $dh{NAME}) {
return $dh{NAME};
}
return $package;
}
# Returns 1 if the package is a native debian package, null otherwise.
# As a side effect, sets $dh{VERSION} to the version of this package.
{
# Caches return code so it only needs to run dpkg-parsechangelog once.
my %isnative_cache;
sub isnative {
my $package=shift;
return $isnative_cache{$package} if defined $isnative_cache{$package};
# Make sure we look at the correct changelog.
my $isnative_changelog=pkgfile($package,"changelog");
if (! $isnative_changelog) {
$isnative_changelog="debian/changelog";
}
# Get the package version.
my $version=`dpkg-parsechangelog -l$isnative_changelog`;
($dh{VERSION})=$version=~m/Version:\s*(.*)/m;
# Did the changelog parse fail?
if (! defined $dh{VERSION}) {
error("changelog parse failure");
}
# Is this a native Debian package?
if ($dh{VERSION}=~m/.*-/) {
return $isnative_cache{$package}=0;
}
else {
return $isnative_cache{$package}=1;
}
}
}
# Automatically add a shell script snippet to a debian script.
# Only works if the script has #DEBHELPER# in it.
#
# Parameters:
# 1: package
# 2: script to add to
# 3: filename of snippet
# 4: either text: shell-quoted sed to run on the snippet. Ie, 's/#PACKAGE#/$PACKAGE/'
# or a sub to run on each line of the snippet. Ie sub { s/#PACKAGE#/$PACKAGE/ }
sub autoscript {
my $package=shift;
my $script=shift;
my $filename=shift;
my $sed=shift || "";
# This is the file we will modify.
my $outfile="debian/".pkgext($package)."$script.debhelper";
# Figure out what shell script snippet to use.
my $infile;
if (defined($ENV{DH_AUTOSCRIPTDIR}) &&
-e "$ENV{DH_AUTOSCRIPTDIR}/$filename") {
$infile="$ENV{DH_AUTOSCRIPTDIR}/$filename";
}
else {
if (-e "$prefix/share/debhelper/autoscripts/$filename") {
$infile="$prefix/share/debhelper/autoscripts/$filename";
}
else {
error("$prefix/share/debhelper/autoscripts/$filename does not exist");
}
}
if (-e $outfile && ($script eq 'postrm' || $script eq 'prerm')
&& !compat(5)) {
# Add fragments to top so they run in reverse order when removing.
complex_doit("echo \"# Automatically added by ".basename($0)."\"> $outfile.new");
autoscript_sed($sed, $infile, "$outfile.new");
complex_doit("echo '# End automatically added section' >> $outfile.new");
complex_doit("cat $outfile >> $outfile.new");
complex_doit("mv $outfile.new $outfile");
}
else {
complex_doit("echo \"# Automatically added by ".basename($0)."\">> $outfile");
autoscript_sed($sed, $infile, $outfile);
complex_doit("echo '# End automatically added section' >> $outfile");
}
}
sub autoscript_sed {
my $sed = shift;
my $infile = shift;
my $outfile = shift;
if (ref($sed) eq 'CODE') {
open(IN, $infile) or die "$infile: $!";
open(OUT, ">>$outfile") or die "$outfile: $!";
while (<IN>) { $sed->(); print OUT }
close(OUT) or die "$outfile: $!";
close(IN) or die "$infile: $!";
}
else {
complex_doit("sed \"$sed\" $infile >> $outfile");
}
}
# Removes a whole substvar line.
sub delsubstvar {
my $package=shift;
my $substvar=shift;
my $ext=pkgext($package);
my $substvarfile="debian/${ext}substvars";
if (-e $substvarfile) {
complex_doit("grep -s -v '^${substvar}=' $substvarfile > $substvarfile.new || true");
doit("mv", "$substvarfile.new","$substvarfile");
}
}
# Adds a dependency on some package to the specified
# substvar in a package's substvar's file.
sub addsubstvar {
my $package=shift;
my $substvar=shift;
my $deppackage=shift;
my $verinfo=shift;
my $remove=shift;
my $ext=pkgext($package);
my $substvarfile="debian/${ext}substvars";
my $str=$deppackage;
$str.=" ($verinfo)" if defined $verinfo && length $verinfo;
# Figure out what the line will look like, based on what's there
# now, and what we're to add or remove.
my $line="";
if (-e $substvarfile) {
my %items;
open(SUBSTVARS_IN, "$substvarfile") || error "read $substvarfile: $!";
while (<SUBSTVARS_IN>) {
chomp;
if (/^\Q$substvar\E=(.*)/) {
%items = map { $_ => 1} split(", ", $1);
last;
}
}
close SUBSTVARS_IN;
if (! $remove) {
$items{$str}=1;
}
else {
delete $items{$str};
}
$line=join(", ", sort keys %items);
}
elsif (! $remove) {
$line=$str;
}
if (length $line) {
complex_doit("(grep -s -v ${substvar} $substvarfile; echo ".escape_shell("${substvar}=$line").") > $substvarfile.new");
doit("mv", "$substvarfile.new", $substvarfile);
}
else {
delsubstvar($package,$substvar);
}
}
# Reads in the specified file, one line at a time. splits on words,
# and returns an array of arrays of the contents.
# If a value is passed in as the second parameter, then glob
# expansion is done in the directory specified by the parameter ("." is
# frequently a good choice).
sub filedoublearray {
my $file=shift;
my $globdir=shift;
# executable config files are a v9 thing.
my $x=! compat(8) && -x $file;
if ($x) {
require Cwd;
my $cmd=Cwd::abs_path($file);
open (DH_FARRAY_IN, "$cmd |") || error("cannot run $file: $!");
}
else {
open (DH_FARRAY_IN, $file) || error("cannot read $file: $!");
}
my @ret;
while (<DH_FARRAY_IN>) {
chomp;
# Only ignore comments and empty lines in v5 mode.
if (! compat(4) && ! $x) {
next if /^#/ || /^$/;
}
my @line;
# Only do glob expansion in v3 mode.
#
# The tricky bit is that the glob expansion is done
# as if we were in the specified directory, so the
# filenames that come out are relative to it.
if (defined $globdir && ! compat(2) && ! $x) {
foreach (map { glob "$globdir/$_" } split) {
s#^$globdir/##;
push @line, $_;
}
}
else {
@line = split;
}
push @ret, [@line];
}
close DH_FARRAY_IN || error("problem reading $file: $!");
return @ret;
}
# Reads in the specified file, one word at a time, and returns an array of
# the result. Can do globbing as does filedoublearray.
sub filearray {
return map { @$_ } filedoublearray(@_);
}
# Passed a filename, returns true if -X says that file should be excluded.
sub excludefile {
my $filename = shift;
foreach my $f (@{$dh{EXCLUDE}}) {
return 1 if $filename =~ /\Q$f\E/;
}
return 0;
}
{
my %dpkg_arch_output;
sub dpkg_architecture_value {
my $var = shift;
if (! exists($dpkg_arch_output{$var})) {
local $_;
open(PIPE, '-|', 'dpkg-architecture')
or error("dpkg-architecture failed");
while (<PIPE>) {
chomp;
my ($k, $v) = split(/=/, $_, 2);
$dpkg_arch_output{$k} = $v;
}
close(PIPE);
}
return $dpkg_arch_output{$var};
}
}
# Returns the build architecture.
sub buildarch {
dpkg_architecture_value('DEB_HOST_ARCH');
}
# Returns the build OS.
sub buildos {
dpkg_architecture_value("DEB_HOST_ARCH_OS");
}
# Passed an arch and a list of arches to match against, returns true if matched
{
my %knownsame;
sub samearch {
my $arch=shift;
my @archlist=split(/\s+/,shift);
foreach my $a (@archlist) {
# Avoid expensive dpkg-architecture call to compare
# with a simple architecture name. "linux-any" and
# other architecture wildcards are (currently)
# always hypenated.
if ($a !~ /-/) {
return 1 if $arch eq $a;
}
elsif (exists $knownsame{$arch}{$a}) {
return 1 if $knownsame{$arch}{$a};
}
elsif (system("dpkg-architecture", "-a$arch", "-i$a") == 0) {
return $knownsame{$arch}{$a}=1;
}
else {
$knownsame{$arch}{$a}=0;
}
}
return 0;
}
}
# Returns source package name
sub sourcepackage {
open (CONTROL, 'debian/control') ||
error("cannot read debian/control: $!\n");
while (<CONTROL>) {
chomp;
s/\s+$//;
if (/^Source:\s*(.*)/) {
close CONTROL;
return $1;
}
}
close CONTROL;
error("could not find Source: line in control file.");
}
# Returns a list of packages in the control file.
# Pass "arch" or "indep" to specify arch-dependant (that will be built
# for the system's arch) or independant. If nothing is specified,
# returns all packages. Also, "both" returns the union of "arch" and "indep"
# packages.
# As a side effect, populates %package_arches and %package_types with the
# types of all packages (not only those returned).
my (%package_types, %package_arches);
sub getpackages {
my $type=shift;
%package_types=();
%package_arches=();
$type="" if ! defined $type;
my $package="";
my $arch="";
my $package_type;
my @list=();
my %seen;
open (CONTROL, 'debian/control') ||
error("cannot read debian/control: $!\n");
while (<CONTROL>) {
chomp;
s/\s+$//;
if (/^Package:\s*(.*)/) {
$package=$1;
# Detect duplicate package names in the same control file.
if (! $seen{$package}) {
$seen{$package}=1;
}
else {
error("debian/control has a duplicate entry for $package");
}
$package_type="deb";
}
if (/^Architecture:\s*(.*)/) {
$arch=$1;
}
if (/^(?:X[BC]*-)?Package-Type:\s*(.*)/) {
$package_type=$1;
}
if (!$_ or eof) { # end of stanza.
if ($package) {
$package_types{$package}=$package_type;
$package_arches{$package}=$arch;
}
if ($package &&
((($type eq 'indep' || $type eq 'both') && $arch eq 'all') ||
(($type eq 'arch' || $type eq 'both') && ($arch eq 'any' ||
($arch ne 'all' &&
samearch(buildarch(), $arch)))) ||
! $type)) {
push @list, $package;
$package="";
$arch="";
}
}
}
close CONTROL;
return @list;
}
# Returns the arch a package will build for.
sub package_arch {
my $package=shift;
if (! exists $package_arches{$package}) {
warning "package $package is not in control info";
return buildarch();
}
return $package_arches{$package} eq 'all' ? "all" : buildarch();
}
# Return true if a given package is really a udeb.
sub is_udeb {
my $package=shift;
if (! exists $package_types{$package}) {
warning "package $package is not in control info";
return 0;
}
return $package_types{$package} eq 'udeb';
}
# Generates the filename that is used for a udeb package.
sub udeb_filename {
my $package=shift;
my $filearch=package_arch($package);
isnative($package); # side effect
my $version=$dh{VERSION};
$version=~s/^[0-9]+://; # strip any epoch
return "${package}_${version}_$filearch.udeb";
}
# Handles #DEBHELPER# substitution in a script; also can generate a new
# script from scratch if none exists but there is a .debhelper file for it.
sub debhelper_script_subst {
my $package=shift;
my $script=shift;
my $tmp=tmpdir($package);
my $ext=pkgext($package);
my $file=pkgfile($package,$script);
if ($file ne '') {
if (-f "debian/$ext$script.debhelper") {
# Add this into the script, where it has #DEBHELPER#
complex_doit("perl -pe 's~#DEBHELPER#~qx{cat debian/$ext$script.debhelper}~eg' < $file > $tmp/DEBIAN/$script");
}
else {
# Just get rid of any #DEBHELPER# in the script.
complex_doit("sed s/#DEBHELPER#// < $file > $tmp/DEBIAN/$script");
}
doit("chown","0:0","$tmp/DEBIAN/$script");
doit("chmod",755,"$tmp/DEBIAN/$script");
}
elsif ( -f "debian/$ext$script.debhelper" ) {
complex_doit("printf '#!/bin/sh\nset -e\n' > $tmp/DEBIAN/$script");
complex_doit("cat debian/$ext$script.debhelper >> $tmp/DEBIAN/$script");
doit("chown","0:0","$tmp/DEBIAN/$script");
doit("chmod",755,"$tmp/DEBIAN/$script");
}
}
# Checks if make's jobserver is enabled via MAKEFLAGS, but
# the FD used to communicate with it is actually not available.
sub is_make_jobserver_unavailable {
if (exists $ENV{MAKEFLAGS} &&
$ENV{MAKEFLAGS} =~ /(?:^|\s)--jobserver-fds=(\d+)/) {
if (!open(my $in, "<&$1")) {
return 1; # unavailable
}
else {
close $in;
return 0; # available
}
}
return; # no jobserver specified
}
# Cleans out jobserver options from MAKEFLAGS.
sub clean_jobserver_makeflags {
if (exists $ENV{MAKEFLAGS}) {
if ($ENV{MAKEFLAGS} =~ /(?:^|\s)--jobserver-fds=(\d+)/) {
$ENV{MAKEFLAGS} =~ s/(?:^|\s)--jobserver-fds=\S+//g;
$ENV{MAKEFLAGS} =~ s/(?:^|\s)-j\b//g;
}
delete $ENV{MAKEFLAGS} if $ENV{MAKEFLAGS} =~ /^\s*$/;
}
}
# If cross-compiling, returns appropriate cross version of command.
sub cross_command {
my $command=shift;
if (dpkg_architecture_value("DEB_BUILD_GNU_TYPE")
ne dpkg_architecture_value("DEB_HOST_GNU_TYPE")) {
return dpkg_architecture_value("DEB_HOST_GNU_TYPE")."-$command";
}
else {
return $command;
}
}
# Sets environment variables from dpkg-buildflags. Avoids changing
# any existing environment variables.
sub set_buildflags {
return if $ENV{DH_INTERNAL_BUILDFLAGS} || compat(8);
$ENV{DH_INTERNAL_BUILDFLAGS}=1;
eval "use Dpkg::BuildFlags";
if ($@) {
warning "unable to load build flags: $@";
return;
}
my $buildflags = Dpkg::BuildFlags->new();
$buildflags->load_config();
foreach my $flag ($buildflags->list()) {
next unless $flag =~ /^[A-Z]/; # Skip flags starting with lowercase
if (! exists $ENV{$flag}) {
$ENV{$flag} = $buildflags->get($flag);
}
}
}
# Gets a DEB_BUILD_OPTIONS option, if set.
sub get_buildoption {
my $wanted=shift;
return undef unless exists $ENV{DEB_BUILD_OPTIONS};
foreach my $opt (split(/\s+/, $ENV{DEB_BUILD_OPTIONS})) {
# currently parallel= is the only one with a parameter
if ($opt =~ /^parallel=(-?\d+)$/ && $wanted eq 'parallel') {
return $1;
}
elsif ($opt eq $wanted) {
return 1;
}
}
}
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