/usr/share/perl5/Dpkg/Shlibs.pm is in libdpkg-perl 1.17.5ubuntu5.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | # 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 <https://www.gnu.org/licenses/>.
package Dpkg::Shlibs;
use strict;
use warnings;
our $VERSION = '0.02';
use Exporter qw(import);
our @EXPORT_OK = qw(add_library_dir get_library_paths reset_library_paths
find_library);
use File::Spec;
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Shlibs::Objdump;
use Dpkg::Util qw(:list);
use Dpkg::Path qw(resolve_symlink canonpath);
use Dpkg::Arch qw(debarch_to_gnutriplet get_build_arch get_host_arch
gnutriplet_to_multiarch debarch_to_multiarch);
use constant DEFAULT_LIBRARY_PATH =>
qw(/lib /usr/lib /lib32 /usr/lib32 /lib64 /usr/lib64
/emul/ia32-linux/lib /emul/ia32-linux/usr/lib);
# Adjust set of directories to consider when we're in a situation of a
# cross-build or a build of a cross-compiler
my @crosslibrarypaths;
my ($crossprefix, $multiarch);
# Detect cross compiler builds
if ($ENV{GCC_TARGET}) {
$crossprefix = debarch_to_gnutriplet($ENV{GCC_TARGET});
$multiarch = debarch_to_multiarch($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};
$multiarch = gnutriplet_to_multiarch($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());
$multiarch = debarch_to_multiarch(get_host_arch());
}
# Define list of directories containing crossbuilt libraries
if ($crossprefix) {
push @crosslibrarypaths, "/lib/$multiarch", "/usr/lib/$multiarch",
"/$crossprefix/lib", "/usr/$crossprefix/lib",
"/$crossprefix/lib32", "/usr/$crossprefix/lib32",
"/$crossprefix/lib64", "/usr/$crossprefix/lib64";
}
my @librarypaths = (DEFAULT_LIBRARY_PATH, @crosslibrarypaths);
# 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);
}
}
# 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 = $_;
if (none { $_ eq $libdir } @librarypaths) {
push @librarypaths, $libdir;
}
}
}
close $fh;
}
sub add_library_dir {
my ($dir) = @_;
unshift @librarypaths, $dir;
}
sub get_library_paths {
return @librarypaths;
}
sub reset_library_paths {
@librarypaths = ();
}
# find_library ($soname, \@rpath, $format, $root)
sub find_library {
my ($lib, $rpath, $format, $root) = @_;
$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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