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- # Copyright © 2007 Raphaël Hertzog <hertzog@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 <http://www.gnu.org/licenses/>.
-
- package Dpkg::Shlibs;
-
- use strict;
- use warnings;
-
- our $VERSION = "0.01";
-
- use base qw(Exporter);
- our @EXPORT_OK = qw(@librarypaths find_library);
-
- use File::Spec;
-
- use Dpkg::Gettext;
- use Dpkg::ErrorHandling;
- use Dpkg::Shlibs::Objdump;
- use Dpkg::Path qw(resolve_symlink canonpath);
- use Dpkg::Arch qw(debarch_to_gnutriplet get_build_arch get_host_arch);
-
- use constant DEFAULT_LIBRARY_PATH =>
- qw(/lib /usr/lib /lib32 /usr/lib32 /lib64 /usr/lib64
- /emul/ia32-linux/lib /emul/ia32-linux/usr/lib);
-
- # Adjust set of directories to consider when we're in a situation of a
- # cross-build or a build of a cross-compiler
- my @crosslibrarypaths;
- my $crossprefix;
- # Detect cross compiler builds
- if ($ENV{GCC_TARGET}) {
- $crossprefix = debarch_to_gnutriplet($ENV{GCC_TARGET});
- }
- if ($ENV{DEB_TARGET_GNU_TYPE} and
- ($ENV{DEB_TARGET_GNU_TYPE} ne $ENV{DEB_BUILD_GNU_TYPE}))
- {
- $crossprefix = $ENV{DEB_TARGET_GNU_TYPE};
- }
- # host for normal cross builds.
- if (get_build_arch() ne get_host_arch()) {
- $crossprefix = debarch_to_gnutriplet(get_host_arch());
- }
- # Define list of directories containing crossbuilt libraries
- if ($crossprefix) {
- push @crosslibrarypaths, "/$crossprefix/lib", "/usr/$crossprefix/lib",
- "/$crossprefix/lib32", "/usr/$crossprefix/lib32",
- "/$crossprefix/lib64", "/usr/$crossprefix/lib64";
- }
-
- our @librarypaths = (DEFAULT_LIBRARY_PATH, @crosslibrarypaths);
-
- # Update library paths with LD_LIBRARY_PATH
- if ($ENV{LD_LIBRARY_PATH}) {
- foreach my $path (reverse split( /:/, $ENV{LD_LIBRARY_PATH} )) {
- $path =~ s{/+$}{};
- unshift @librarypaths, $path;
- }
- }
-
- # Update library paths with ld.so config
- parse_ldso_conf("/etc/ld.so.conf") if -e "/etc/ld.so.conf";
-
- my %visited;
- sub parse_ldso_conf {
- my $file = shift;
- 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 = $_;
- unless (scalar grep { $_ eq $libdir } @librarypaths) {
- push @librarypaths, $libdir;
- }
- }
- }
- close $fh;
- }
-
- # find_library ($soname, \@rpath, $format, $root)
- sub find_library {
- my ($lib, $rpath, $format, $root) = @_;
- $root = "" if not defined($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 (grep { "$root$_" 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 undef;
- }
-
- 1;
-