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# Copyright © 2007 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2007-2008, 2012-2015 Guillem Jover <guillem@debian.org>
#
# 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/>.
package Dpkg::Shlibs;
use strict;
use warnings;
our $VERSION = '0.02';
our @EXPORT_OK = qw(
blank_library_paths
setup_library_paths
get_library_paths
add_library_dir
find_library
);
use Exporter qw(import);
use File::Spec;
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Shlibs::Objdump;
use Dpkg::Util qw(:list);
use Dpkg::Path qw(resolve_symlink canonpath);
use Dpkg::Arch qw(debarch_to_gnutriplet get_build_arch get_host_arch
gnutriplet_to_multiarch debarch_to_multiarch);
use constant DEFAULT_LIBRARY_PATH =>
qw(/lib /usr/lib);
# XXX: Deprecated multilib paths.
use constant DEFAULT_MULTILIB_PATH =>
qw(/lib32 /usr/lib32 /lib64 /usr/lib64
/emul/ia32-linux/lib /emul/ia32-linux/usr/lib);
my @librarypaths;
my $librarypaths_init;
my %visited;
sub parse_ldso_conf {
my $file = shift;
local $_;
open my $fh, '<', $file or syserr(g_('cannot open %s'), $file);
$visited{$file}++;
while (<$fh>) {
next if /^\s*$/;
chomp;
s{/+$}{};
if (/^include\s+(\S.*\S)\s*$/) {
foreach my $include (glob($1)) {
parse_ldso_conf($include) if -e $include
&& !$visited{$include};
}
} elsif (m{^\s*/}) {
s/^\s+//;
my $libdir = $_;
if (none { $_ eq $libdir } @librarypaths) {
push @librarypaths, $libdir;
}
}
}
close $fh;
}
sub blank_library_paths {
@librarypaths = ();
$librarypaths_init = 1;
}
sub setup_library_paths {
@librarypaths = DEFAULT_LIBRARY_PATH;
# Update library paths with ld.so config.
parse_ldso_conf('/etc/ld.so.conf') if -e '/etc/ld.so.conf';
push @librarypaths, DEFAULT_MULTILIB_PATH;
# Adjust set of directories to consider when we're in a situation of a
# cross-build or a build of a cross-compiler.
my $multiarch;
# Detect cross compiler builds.
if ($ENV{DEB_TARGET_GNU_TYPE} and
($ENV{DEB_TARGET_GNU_TYPE} ne $ENV{DEB_BUILD_GNU_TYPE}))
{
$multiarch = gnutriplet_to_multiarch($ENV{DEB_TARGET_GNU_TYPE});
}
# Host for normal cross builds.
if (get_build_arch() ne get_host_arch()) {
$multiarch = debarch_to_multiarch(get_host_arch());
}
# Define list of directories containing crossbuilt libraries.
if ($multiarch) {
push @librarypaths, "/lib/$multiarch", "/usr/lib/$multiarch";
}
# XXX: Deprecated. Update library paths with LD_LIBRARY_PATH.
if ($ENV{LD_LIBRARY_PATH}) {
foreach my $path (reverse split( /:/, $ENV{LD_LIBRARY_PATH})) {
$path =~ s{/+$}{};
add_library_dir($path);
}
}
$librarypaths_init = 1;
}
sub add_library_dir {
my $dir = shift;
setup_library_paths() if not $librarypaths_init;
unshift @librarypaths, $dir;
}
sub get_library_paths {
setup_library_paths() if not $librarypaths_init;
return @librarypaths;
}
# find_library ($soname, \@rpath, $format, $root)
sub find_library {
my ($lib, $rpath, $format, $root) = @_;
setup_library_paths() if not $librarypaths_init;
$root //= '';
$root =~ s{/+$}{};
my @rpath = @{$rpath};
foreach my $dir (@rpath, @librarypaths) {
my $checkdir = "$root$dir";
# If the directory checked is a symlink, check if it doesn't
# resolve to another public directory (which is then the canonical
# directory to use instead of this one). Typical example
# is /usr/lib64 -> /usr/lib on amd64.
if (-l $checkdir) {
my $newdir = resolve_symlink($checkdir);
if (any { "$root$_" eq "$newdir" } (@rpath, @librarypaths)) {
$checkdir = $newdir;
}
}
if (-e "$checkdir/$lib") {
my $libformat = Dpkg::Shlibs::Objdump::get_format("$checkdir/$lib");
if ($format eq $libformat) {
return canonpath("$checkdir/$lib");
}
}
}
return;
}
1;
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