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#!/usr/bin/perl
#
# dpkg-shlibdeps
#
# Copyright © 1996 Ian Jackson
# Copyright © 2000 Wichert Akkerman
# Copyright © 2006 Frank Lichtenheld
# Copyright © 2006-2010,2012-2013 Guillem Jover <guillem@debian.org>
# Copyright © 2007 Raphaël Hertzog
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
use strict;
use warnings;
use POSIX qw(:errno_h);
use Cwd qw(realpath);
use File::Basename qw(dirname);
use Dpkg ();
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Util qw(:list);
use Dpkg::Path qw(relative_to_pkg_root guess_pkg_root_dir
check_files_are_the_same get_control_path);
use Dpkg::Version;
use Dpkg::Shlibs qw(find_library get_library_paths);
use Dpkg::Shlibs::Objdump;
use Dpkg::Shlibs::SymbolFile;
use Dpkg::Arch qw(get_host_arch);
use Dpkg::Deps;
use Dpkg::Control::Info;
use Dpkg::Control::Fields;
use constant {
WARN_SYM_NOT_FOUND => 1,
WARN_DEP_AVOIDABLE => 2,
WARN_NOT_NEEDED => 4,
};
# By increasing importance
my @depfields = qw(Suggests Recommends Depends Pre-Depends);
my $i = 0; my %depstrength = map { $_ => $i++ } @depfields;
textdomain('dpkg-dev');
my $admindir = $Dpkg::ADMINDIR;
my $shlibsoverride = "$Dpkg::CONFDIR/shlibs.override";
my $shlibsdefault = "$Dpkg::CONFDIR/shlibs.default";
my $shlibslocal = 'debian/shlibs.local';
my $packagetype = 'deb';
my $dependencyfield = 'Depends';
my $varlistfile = 'debian/substvars';
my $varnameprefix = 'shlibs';
my $ignore_missing_info = 0;
my $warnings = 3;
my $debug = 0;
my @exclude = ();
my @pkg_dir_to_search = ();
my $host_arch = get_host_arch();
my (@pkg_shlibs, @pkg_symbols, @pkg_root_dirs);
if (-d 'debian') {
push @pkg_symbols, glob 'debian/*/DEBIAN/symbols';
push @pkg_shlibs, glob 'debian/*/DEBIAN/shlibs';
my %uniq = map { guess_pkg_root_dir($_) => 1 } (@pkg_symbols, @pkg_shlibs);
push @pkg_root_dirs, keys %uniq;
}
my ($stdout, %exec);
foreach (@ARGV) {
if (m/^-T(.*)$/) {
$varlistfile = $1;
} elsif (m/^-p(\w[-:0-9A-Za-z]*)$/) {
$varnameprefix = $1;
} elsif (m/^-L(.*)$/) {
$shlibslocal = $1;
} elsif (m/^-l(.*)$/) {
Dpkg::Shlibs::add_library_dir($1);
} elsif (m/^-S(.*)$/) {
push @pkg_dir_to_search, $1;
} elsif (m/^-O$/) {
$stdout = 1;
} elsif (m/^-O(.+)$/) {
$varlistfile = $1;
} elsif (m/^-(\?|-help)$/) {
usage(); exit(0);
} elsif (m/^--version$/) {
version(); exit(0);
} elsif (m/^--admindir=(.*)$/) {
$admindir = $1;
if (not -d $admindir) {
error(_g("administrative directory '%s' does not exist"), $admindir);
}
$ENV{DPKG_ADMINDIR} = $admindir;
} elsif (m/^-d(.*)$/) {
$dependencyfield = field_capitalize($1);
if (not defined $depstrength{$dependencyfield}) {
warning(_g("unrecognized dependency field '%s'"), $dependencyfield);
}
} elsif (m/^-e(.*)$/) {
if (exists $exec{$1}) {
# Affect the binary to the most important field
if ($depstrength{$dependencyfield} > $depstrength{$exec{$1}}) {
$exec{$1} = $dependencyfield;
}
} else {
$exec{$1} = $dependencyfield;
}
} elsif (m/^--ignore-missing-info$/) {
$ignore_missing_info = 1;
} elsif (m/^--warnings=(\d+)$/) {
$warnings = $1;
} elsif (m/^-t(.*)$/) {
$packagetype = $1;
} elsif (m/^-v$/) {
$debug++;
} elsif (m/^-x(.*)$/) {
push @exclude, $1;
} elsif (m/^-/) {
usageerr(_g("unknown option \`%s'"), $_);
} else {
if (exists $exec{$_}) {
# Affect the binary to the most important field
if ($depstrength{$dependencyfield} > $depstrength{$exec{$_}}) {
$exec{$_} = $dependencyfield;
}
} else {
$exec{$_} = $dependencyfield;
}
}
}
usageerr(_g('need at least one executable')) unless scalar keys %exec;
my $control = Dpkg::Control::Info->new();
my $fields = $control->get_source();
my $bd_value = deps_concat($fields->{'Build-Depends'}, $fields->{'Build-Depends-Arch'});
my $build_deps = deps_parse($bd_value, build_dep => 1, reduce_restrictions => 1);
error(_g('error occurred while parsing %s'), 'Build-Depends/Build-Depends-Arch')
unless defined $build_deps;
my %dependencies;
# Statictics on soname seen in the whole run (with multiple analysis of
# binaries)
my %global_soname_notfound;
my %global_soname_used;
my %global_soname_needed;
# Symfile and objdump caches
my %symfile_cache;
my %objdump_cache;
my %symfile_has_soname_cache;
# Used to count errors due to missing libraries
my $error_count = 0;
my $cur_field;
foreach my $file (keys %exec) {
$cur_field = $exec{$file};
print ">> Scanning $file (for $cur_field field)\n" if $debug;
my $obj = Dpkg::Shlibs::Objdump::Object->new($file);
my @sonames = $obj->get_needed_libraries;
# Load symbols files for all needed libraries (identified by SONAME)
my %libfiles;
my %altlibfiles;
my %soname_notfound;
my %alt_soname;
foreach my $soname (@sonames) {
my $lib = my_find_library($soname, $obj->{RPATH}, $obj->{format}, $file);
unless (defined $lib) {
$soname_notfound{$soname} = 1;
$global_soname_notfound{$soname} = 1;
my $msg = _g("couldn't find library %s needed by %s (ELF " .
"format: '%s'; RPATH: '%s')");
if (scalar(split_soname($soname))) {
errormsg($msg, $soname, $file, $obj->{format}, join(':', @{$obj->{RPATH}}));
$error_count++;
} else {
warning($msg, $soname, $file, $obj->{format}, join(':', @{$obj->{RPATH}}));
}
next;
}
$libfiles{$lib} = $soname;
my $reallib = realpath($lib);
if ($reallib ne $lib) {
$altlibfiles{$reallib} = $soname;
}
print "Library $soname found in $lib\n" if $debug;
}
my $file2pkg = find_packages(keys %libfiles, keys %altlibfiles);
my $symfile = Dpkg::Shlibs::SymbolFile->new();
my $dumplibs_wo_symfile = Dpkg::Shlibs::Objdump->new();
my @soname_wo_symfile;
foreach my $lib (keys %libfiles) {
my $soname = $libfiles{$lib};
if (none { $_ ne '' } @{$file2pkg->{$lib}}) {
# The path of the library as calculated is not the
# official path of a packaged file, try to fallback on
# on the realpath() first, maybe this one is part of a package
my $reallib = realpath($lib);
if (exists $file2pkg->{$reallib}) {
$file2pkg->{$lib} = $file2pkg->{$reallib};
}
}
if (none { $_ ne '' } @{$file2pkg->{$lib}}) {
# If the library is really not available in an installed package,
# it's because it's in the process of being built
# Empty package name will lead to consideration of symbols
# file from the package being built only
$file2pkg->{$lib} = [''];
print "No associated package found for $lib\n" if $debug;
}
# Load symbols/shlibs files from packages providing libraries
foreach my $pkg (@{$file2pkg->{$lib}}) {
my $symfile_path;
my $haslocaldep = 0;
if (-e $shlibslocal and
defined(extract_from_shlibs($soname, $shlibslocal)))
{
$haslocaldep = 1;
}
if ($packagetype eq 'deb' and not $haslocaldep) {
# Use fine-grained dependencies only on real deb
# and only if the dependency is not provided by shlibs.local
$symfile_path = find_symbols_file($pkg, $soname, $lib);
}
if (defined($symfile_path)) {
# Load symbol information
print "Using symbols file $symfile_path for $soname\n" if $debug;
unless (exists $symfile_cache{$symfile_path}) {
$symfile_cache{$symfile_path} =
Dpkg::Shlibs::SymbolFile->new(file => $symfile_path);
}
$symfile->merge_object_from_symfile($symfile_cache{$symfile_path}, $soname);
}
if (defined($symfile_path) && $symfile->has_object($soname)) {
# Initialize dependencies with the smallest minimal version
# of all symbols (unversioned dependency is not ok as the
# library might not have always been available in the
# package and we really need it)
my $dep = $symfile->get_dependency($soname);
my $minver = $symfile->get_smallest_version($soname) || '';
foreach my $subdep (split /\s*,\s*/, $dep) {
if (not exists $dependencies{$cur_field}{$subdep}) {
$dependencies{$cur_field}{$subdep} = Dpkg::Version->new($minver);
print " Initialize dependency ($subdep) with minimal " .
"version ($minver)\n" if $debug > 1;
}
}
} else {
# No symbol file found, fall back to standard shlibs
print "Using shlibs+objdump for $soname (file $lib)\n" if $debug;
unless (exists $objdump_cache{$lib}) {
$objdump_cache{$lib} = Dpkg::Shlibs::Objdump::Object->new($lib);
}
my $libobj = $objdump_cache{$lib};
my $id = $dumplibs_wo_symfile->add_object($libobj);
if (($id ne $soname) and ($id ne $lib)) {
warning(_g('%s has an unexpected SONAME (%s)'), $lib, $id);
$alt_soname{$id} = $soname;
}
push @soname_wo_symfile, $soname;
# Only try to generate a dependency for libraries with a SONAME
if ($libobj->is_public_library() and not
add_shlibs_dep($soname, $pkg, $lib)) {
# This failure is fairly new, try to be kind by
# ignoring as many cases that can be safely ignored
my $ignore = 0;
# 1/ when the lib and the binary are in the same
# package
my $root_file = guess_pkg_root_dir($file);
my $root_lib = guess_pkg_root_dir($lib);
$ignore++ if defined $root_file and defined $root_lib
and check_files_are_the_same($root_file, $root_lib);
# 2/ when the lib is not versioned and can't be
# handled by shlibs
$ignore++ unless scalar(split_soname($soname));
# 3/ when we have been asked to do so
$ignore++ if $ignore_missing_info;
error(_g('no dependency information found for %s ' .
'(used by %s)'), $lib, $file)
unless $ignore;
}
}
}
}
# Scan all undefined symbols of the binary and resolve to a
# dependency
my %soname_used;
foreach (@sonames) {
# Initialize statistics
$soname_used{$_} = 0;
$global_soname_used{$_} = 0 unless exists $global_soname_used{$_};
if (exists $global_soname_needed{$_}) {
push @{$global_soname_needed{$_}}, $file;
} else {
$global_soname_needed{$_} = [ $file ];
}
}
my $nb_warnings = 0;
my $nb_skipped_warnings = 0;
# Disable warnings about missing symbols when we have not been able to
# find all libs
my $disable_warnings = scalar(keys(%soname_notfound));
my $in_public_dir = 1;
if (my $relname = relative_to_pkg_root($file)) {
my $parent_dir = '/' . dirname($relname);
$in_public_dir = any { $parent_dir eq $_ } get_library_paths();
} else {
warning(_g('binaries to analyze should already be ' .
"installed in their package's directory"));
}
print "Analyzing all undefined symbols\n" if $debug > 1;
foreach my $sym ($obj->get_undefined_dynamic_symbols()) {
my $name = $sym->{name};
if ($sym->{version}) {
$name .= '@' . "$sym->{version}";
} else {
$name .= '@' . 'Base';
}
print " Looking up symbol $name\n" if $debug > 1;
my %symdep = $symfile->lookup_symbol($name, \@sonames);
if (keys %symdep) {
my $depends = $symfile->get_dependency($symdep{soname},
$symdep{symbol}{dep_id});
print " Found in symbols file of $symdep{soname} (minver: " .
"$symdep{symbol}{minver}, dep: $depends)\n" if $debug > 1;
$soname_used{$symdep{soname}}++;
$global_soname_used{$symdep{soname}}++;
if (exists $alt_soname{$symdep{soname}}) {
# Also count usage on alternate soname
$soname_used{$alt_soname{$symdep{soname}}}++;
$global_soname_used{$alt_soname{$symdep{soname}}}++;
}
update_dependency_version($depends, $symdep{symbol}{minver});
} else {
my $syminfo = $dumplibs_wo_symfile->locate_symbol($name);
if (not defined($syminfo)) {
print " Not found\n" if $debug > 1;
next unless ($warnings & WARN_SYM_NOT_FOUND);
next if $disable_warnings;
# Complain about missing symbols only for executables
# and public libraries
if ($obj->is_executable() or $obj->is_public_library()) {
my $print_name = $name;
# Drop the default suffix for readability
$print_name =~ s/\@Base$//;
unless ($sym->{weak}) {
if ($debug or ($in_public_dir and $nb_warnings < 10)
or (not $in_public_dir and $nb_warnings < 1))
{
if ($in_public_dir) {
warning(_g('symbol %s used by %s found in none of the ' .
'libraries'), $print_name, $file);
} else {
warning(_g('%s contains an unresolvable reference to ' .
"symbol %s: it's probably a plugin"),
$file, $print_name);
}
$nb_warnings++;
} else {
$nb_skipped_warnings++;
}
}
}
} else {
print " Found in $syminfo->{soname} ($syminfo->{objid})\n" if $debug > 1;
if (exists $alt_soname{$syminfo->{soname}}) {
# Also count usage on alternate soname
$soname_used{$alt_soname{$syminfo->{soname}}}++;
$global_soname_used{$alt_soname{$syminfo->{soname}}}++;
}
$soname_used{$syminfo->{soname}}++;
$global_soname_used{$syminfo->{soname}}++;
}
}
}
warning(P_('%d similar warning has been skipped (use -v to see it)',
'%d other similar warnings have been skipped (use -v to see ' .
'them all)', $nb_skipped_warnings), $nb_skipped_warnings)
if $nb_skipped_warnings;
foreach my $soname (@sonames) {
# Adjust minimal version of dependencies with information
# extracted from build-dependencies
my $dev_pkg = $symfile->get_field($soname, 'Build-Depends-Package');
if (defined $dev_pkg) {
print "Updating dependencies of $soname with build-dependencies\n" if $debug;
my $minver = get_min_version_from_deps($build_deps, $dev_pkg);
if (defined $minver) {
foreach my $dep ($symfile->get_dependencies($soname)) {
update_dependency_version($dep, $minver, 1);
print " Minimal version of $dep updated with $minver\n" if $debug;
}
} else {
print " No minimal version found in $dev_pkg build-dependency\n" if $debug;
}
}
# Warn about un-NEEDED libraries
unless ($soname_notfound{$soname} or $soname_used{$soname}) {
# Ignore warning for libm.so.6 if also linked against libstdc++
next if ($soname =~ /^libm\.so\.\d+$/ and
any { m/^libstdc\+\+\.so\.\d+/ } @sonames);
next unless ($warnings & WARN_NOT_NEEDED);
warning(_g('%s should not be linked against %s (it uses none of ' .
"the library's symbols)"), $file, $soname);
}
}
}
# Warn of unneeded libraries at the "package" level (i.e. over all
# binaries that we have inspected)
foreach my $soname (keys %global_soname_needed) {
unless ($global_soname_notfound{$soname} or $global_soname_used{$soname}) {
next if ($soname =~ /^libm\.so\.\d+$/ and
any { m/^libstdc\+\+\.so\.\d+/ } keys %global_soname_needed);
next unless ($warnings & WARN_DEP_AVOIDABLE);
warning(P_('package could avoid a useless dependency if %s was not ' .
"linked against %s (it uses none of the library's symbols)",
'package could avoid a useless dependency if %s were not ' .
"linked against %s (they use none of the library's symbols)",
scalar @{$global_soname_needed{$soname}}),
join(' ', @{$global_soname_needed{$soname}}), $soname);
}
}
# Quit now if any missing libraries
if ($error_count >= 1) {
my $note = _g('Note: libraries are not searched in other binary packages ' .
"that do not have any shlibs or symbols file.\nTo help dpkg-shlibdeps " .
'find private libraries, you might need to use -l.');
error(P_('cannot continue due to the error above',
'cannot continue due to the errors listed above',
$error_count) . "\n" . $note);
}
# Open substvars file
my $fh;
if ($stdout) {
$fh = \*STDOUT;
} else {
open(my $new_fh, '>', "$varlistfile.new")
or syserr(_g("open new substvars file \`%s'"), "$varlistfile.new");
if (-e $varlistfile) {
open(my $old_fh, '<', $varlistfile)
or syserr(_g("open old varlist file \`%s' for reading"), $varlistfile);
while (my $entry = <$old_fh>) {
next if $entry =~ m/^\Q$varnameprefix\E:/;
print { $new_fh } $entry
or syserr(_g("copy old entry to new varlist file \`%s'"),
"$varlistfile.new");
}
close($old_fh);
}
$fh = $new_fh;
}
# Write out the shlibs substvars
my %depseen;
sub filter_deps {
my ($dep, $field) = @_;
# Skip dependencies on excluded packages
foreach my $exc (@exclude) {
return 0 if $dep =~ /^\s*\Q$exc\E\b/;
}
# Don't include dependencies if they are already
# mentionned in a higher priority field
if (not exists($depseen{$dep})) {
$depseen{$dep} = $dependencies{$field}{$dep};
return 1;
} else {
# Since dependencies can be versionned, we have to
# verify if the dependency is stronger than the
# previously seen one
my $stronger;
if ($depseen{$dep} eq $dependencies{$field}{$dep}) {
# If both versions are the same (possibly unversionned)
$stronger = 0;
} elsif ($dependencies{$field}{$dep} eq '') {
$stronger = 0; # If the dep is unversionned
} elsif ($depseen{$dep} eq '') {
$stronger = 1; # If the dep seen is unversionned
} elsif (version_compare_relation($depseen{$dep}, REL_GT,
$dependencies{$field}{$dep})) {
# The version of the dep seen is stronger...
$stronger = 0;
} else {
$stronger = 1;
}
$depseen{$dep} = $dependencies{$field}{$dep} if $stronger;
return $stronger;
}
}
foreach my $field (reverse @depfields) {
my $dep = '';
if (exists $dependencies{$field} and scalar keys %{$dependencies{$field}}) {
$dep = join ', ',
map {
# Translate dependency templates into real dependencies
if ($dependencies{$field}{$_}) {
s/#MINVER#/(>= $dependencies{$field}{$_})/g;
} else {
s/#MINVER#//g;
}
s/\s+/ /g;
$_;
} grep { filter_deps($_, $field) }
keys %{$dependencies{$field}};
}
if ($dep) {
my $obj = deps_parse($dep);
error(_g('invalid dependency got generated: %s'), $dep) unless defined $obj;
$obj->sort();
print { $fh } "$varnameprefix:$field=$obj\n";
}
}
# Replace old file by new one
if (!$stdout) {
close($fh) or syserr(_g('cannot close %s'), "$varlistfile.new");
rename("$varlistfile.new",$varlistfile)
or syserr(_g("install new varlist file \`%s'"), $varlistfile);
}
##
## Functions
##
sub version {
printf _g("Debian %s version %s.\n"), $Dpkg::PROGNAME, $Dpkg::PROGVERSION;
printf _g('
This is free software; see the GNU General Public License version 2 or
later for copying conditions. There is NO warranty.
');
}
sub usage {
printf _g(
'Usage: %s [<option>...] <executable>|-e<executable> [<option>...]')
. "\n\n" . _g(
"Positional options (order is significant):
<executable> include dependencies for <executable>,
-e<executable> (use -e if <executable> starts with '-')
-d<dependency-field> next executable(s) set shlibs:<dependency-field>.")
. "\n\n" . _g(
"Options:
-l<library-dir> add directory to private shared library search list.
-p<varname-prefix> set <varname-prefix>:* instead of shlibs:*.
-O[<file>] write variable settings to stdout (or <file>).
-L<local-shlibs-file> shlibs override file, not debian/shlibs.local.
-T<substvars-file> update variables here, not debian/substvars.
-t<type> set package type (default is deb).
-x<package> exclude package from the generated dependencies.
-S<package-build-dir> search needed libraries in the given
package build directory first.
-v enable verbose mode (can be used multiple times).
--ignore-missing-info don't fail if dependency information can't be found.
--warnings=<value> define set of active warnings (see manual page).
--admindir=<directory> change the administrative directory.
-?, --help show this help message.
--version show the version.")
. "\n\n" . _g(
'Dependency fields recognized are:
%s
'), $Dpkg::PROGNAME, join('/', @depfields);
}
sub get_min_version_from_deps {
my ($dep, $pkg) = @_;
if ($dep->isa('Dpkg::Deps::Simple')) {
if (($dep->{package} eq $pkg) &&
defined($dep->{relation}) &&
(($dep->{relation} eq REL_GE) ||
($dep->{relation} eq REL_GT)))
{
return $dep->{version};
}
return;
} else {
my $res;
foreach my $subdep ($dep->get_deps()) {
my $minver = get_min_version_from_deps($subdep, $pkg);
next if not defined $minver;
if (defined $res) {
if (version_compare_relation($minver, REL_GT, $res)) {
$res = $minver;
}
} else {
$res = $minver;
}
}
return $res;
}
}
sub update_dependency_version {
my ($dep, $minver, $existing_only) = @_;
return if not defined($minver);
$minver = Dpkg::Version->new($minver);
foreach my $subdep (split /\s*,\s*/, $dep) {
if (exists $dependencies{$cur_field}{$subdep} and
defined($dependencies{$cur_field}{$subdep}))
{
if ($dependencies{$cur_field}{$subdep} eq '' or
version_compare_relation($minver, REL_GT,
$dependencies{$cur_field}{$subdep}))
{
$dependencies{$cur_field}{$subdep} = $minver;
}
} elsif (!$existing_only) {
$dependencies{$cur_field}{$subdep} = $minver;
}
}
}
sub add_shlibs_dep {
my ($soname, $pkg, $libfile) = @_;
my @shlibs = ($shlibslocal, $shlibsoverride);
if ($pkg eq '') {
# If the file is not packaged, try to find out the shlibs file in
# the package being built where the lib has been found
my $pkg_root = guess_pkg_root_dir($libfile);
if (defined $pkg_root) {
push @shlibs, "$pkg_root/DEBIAN/shlibs";
}
# Fallback to other shlibs files but it shouldn't be necessary
push @shlibs, @pkg_shlibs;
} else {
my $control_file = get_control_path($pkg, 'shlibs');
push @shlibs, $control_file if defined $control_file;
}
push @shlibs, $shlibsdefault;
print " Looking up shlibs dependency of $soname provided by '$pkg'\n" if $debug;
foreach my $file (@shlibs) {
next if not -e $file;
my $dep = extract_from_shlibs($soname, $file);
if (defined($dep)) {
print " Found $dep in $file\n" if $debug;
foreach (split(/,\s*/, $dep)) {
# Note: the value is empty for shlibs based dependency
# symbol based dependency will put a valid version as value
$dependencies{$cur_field}{$_} = Dpkg::Version->new('');
}
return 1;
}
}
print " Found nothing\n" if $debug;
return 0;
}
sub split_soname {
my $soname = shift;
if ($soname =~ /^(.*)\.so\.(.*)$/) {
return wantarray ? ($1, $2) : 1;
} elsif ($soname =~ /^(.*)-(\d.*)\.so$/) {
return wantarray ? ($1, $2) : 1;
} else {
return wantarray ? () : 0;
}
}
sub extract_from_shlibs {
my ($soname, $shlibfile) = @_;
# Split soname in name/version
my ($libname, $libversion) = split_soname($soname);
unless (defined $libname) {
warning(_g("can't extract name and version from library name '%s'"),
$soname);
return;
}
# Open shlibs file
open(my $shlibs_fh, '<', $shlibfile)
or syserr(_g("unable to open shared libs info file \`%s'"), $shlibfile);
my $dep;
while (<$shlibs_fh>) {
s/\s*\n$//;
next if m/^\#/;
if (!m/^\s*(?:(\S+):\s+)?(\S+)\s+(\S+)(?:\s+(\S.*\S))?\s*$/) {
warning(_g("shared libs info file \`%s' line %d: bad line \`%s'"),
$shlibfile, $., $_);
next;
}
my $depread = defined($4) ? $4 : '';
if (($libname eq $2) && ($libversion eq $3)) {
# Define dep and end here if the package type explicitly
# matches. Otherwise if the packagetype is not specified, use
# the dep only as a default that can be overriden by a later
# line
if (defined($1)) {
if ($1 eq $packagetype) {
$dep = $depread;
last;
}
} else {
$dep //= $depread;
}
}
}
close($shlibs_fh);
return $dep;
}
sub find_symbols_file {
my ($pkg, $soname, $libfile) = @_;
my @files;
if ($pkg eq '') {
# If the file is not packaged, try to find out the symbols file in
# the package being built where the lib has been found
my $pkg_root = guess_pkg_root_dir($libfile);
if (defined $pkg_root) {
push @files, "$pkg_root/DEBIAN/symbols";
}
# Fallback to other symbols files but it shouldn't be necessary
push @files, @pkg_symbols;
} else {
push @files, "$Dpkg::CONFDIR/symbols/$pkg.symbols.$host_arch",
"$Dpkg::CONFDIR/symbols/$pkg.symbols";
my $control_file = get_control_path($pkg, 'symbols');
push @files, $control_file if defined $control_file;
}
foreach my $file (@files) {
if (-e $file and symfile_has_soname($file, $soname)) {
return $file;
}
}
return;
}
sub symfile_has_soname {
my ($file, $soname) = @_;
if (exists $symfile_has_soname_cache{$file}{$soname}) {
return $symfile_has_soname_cache{$file}{$soname};
}
open(my $symfile_fh, '<', $file)
or syserr(_g('cannot open file %s'), $file);
my $result = 0;
while (<$symfile_fh>) {
if (/^\Q$soname\E /) {
$result = 1;
last;
}
}
close($symfile_fh);
$symfile_has_soname_cache{$file}{$soname} = $result;
return $result;
}
# find_library ($soname, \@rpath, $format)
sub my_find_library {
my ($lib, $rpath, $format, $execfile) = @_;
my $file;
# Create real RPATH in case $ORIGIN is used
# Note: ld.so also supports $PLATFORM and $LIB but they are
# used in real case (yet)
my $libdir = relative_to_pkg_root($execfile);
my $origin;
if (defined $libdir) {
$origin = "/$libdir";
$origin =~ s{/+[^/]*$}{};
}
my @RPATH = ();
foreach my $path (@{$rpath}) {
if ($path =~ /\$ORIGIN|\$\{ORIGIN\}/) {
if (defined $origin) {
$path =~ s/\$ORIGIN/$origin/g;
$path =~ s/\$\{ORIGIN\}/$origin/g;
} else {
warning(_g('$ORIGIN is used in RPATH of %s and the corresponding ' .
'directory could not be identified due to lack of DEBIAN ' .
"sub-directory in the root of package's build tree"), $execfile);
}
}
push @RPATH, $path;
}
# Look into the packages we're currently building in the following
# order:
# - package build tree of the binary which is analyzed
# - package build tree given on the command line (option -S)
# - other package build trees that contain either a shlibs or a
# symbols file
my @builddirs;
my $pkg_root = guess_pkg_root_dir($execfile);
push @builddirs, $pkg_root if defined $pkg_root;
push @builddirs, @pkg_dir_to_search;
push @builddirs, @pkg_root_dirs;
my %dir_checked;
foreach my $builddir (@builddirs) {
next if defined($dir_checked{$builddir});
$file = find_library($lib, \@RPATH, $format, $builddir);
return $file if defined($file);
$dir_checked{$builddir} = 1;
}
# Fallback in the root directory if we have not found what we were
# looking for in the packages
$file = find_library($lib, \@RPATH, $format, '');
return $file if defined($file);
return;
}
my %cached_pkgmatch = ();
sub find_packages {
my @files;
my $pkgmatch = {};
foreach (@_) {
if (exists $cached_pkgmatch{$_}) {
$pkgmatch->{$_} = $cached_pkgmatch{$_};
} else {
push @files, $_;
$cached_pkgmatch{$_} = ['']; # placeholder to cache misses too.
$pkgmatch->{$_} = ['']; # might be replaced later on
}
}
return $pkgmatch unless scalar(@files);
my $pid = open(my $dpkg_fh, '-|');
syserr(_g('cannot fork for %s'), 'dpkg --search') unless defined($pid);
if (!$pid) {
# Child process running dpkg --search and discarding errors
close STDERR;
open STDERR, '>', '/dev/null'
or syserr(_g('cannot open file %s'), '/dev/null');
$ENV{LC_ALL} = 'C';
exec('dpkg', '--search', '--', @files)
or syserr(_g('unable to execute %s'), 'dpkg');
}
while (defined($_ = <$dpkg_fh>)) {
chomp($_);
if (m/^local diversion |^diversion by/) {
warning(_g('diversions involved - output may be incorrect'));
print { *STDERR } " $_\n"
or syserr(_g('write diversion info to stderr'));
} elsif (m/^([-a-z0-9+.:, ]+): (\/.*)$/) {
$cached_pkgmatch{$2} = $pkgmatch->{$2} = [ split(/, /, $1) ];
} else {
warning(_g("unknown output from dpkg --search: '%s'"), $_);
}
}
close($dpkg_fh);
return $pkgmatch;
}