#! /usr/bin/perl
#
# slxldd.pl - OpenSLX-rewrite of ldd that works on multiple architectures.
#
# (c) 2006 - OpenSLX.com
#
# Oliver Tappe <ot@openslx.com>
#
use strict;
my $abstract = q[
slxldd.pl
This script reimplements ldd in a way that should work for all
binary formats supported by the binutils installed on the host system.
An example: if you have a folder containing an ia64 system, you can
invoke this script on a ia32-host in order to determine all the libraries
required by a binary of the ia64 target system.
];
use File::Glob ':globally';
use Getopt::Long;
use Pod::Usage;
use OpenSLX::Basics;
my (
$helpReq,
$rootPath,
$versionReq,
@libFolders,
@libs,
%libInfo,
);
GetOptions(
'help|?' => \$helpReq,
'root-path=s' => \$rootPath,
'version' => \$versionReq,
) or pod2usage(2);
pod2usage(-msg => $abstract, -verbose => 0, -exitval => 1) if $helpReq;
if ($versionReq) {
system('slxversion');
exit 1;
}
openslxInit();
if (!$rootPath) {
print _tr("You need to specify the root-path!\n");
pod2usage(2);
}
$rootPath =~ s[/+$][];
# remove trailing slashes
if (!@ARGV) {
print _tr("You need to specify at least one file!\n");
pod2usage(2);
}
fetchLoaderConfig();
foreach my $file (@ARGV) {
if ($file =~ m[^/]) {
# force absolute path relative to $rootPath:
$file = "$rootPath$file";
} else {
# relative paths are relative to $rootPath:
$file = "$rootPath/$file";
}
next if `file $file` =~ m[shell\s+script];
# silently ignore shell scripts
addLibsForBinary($file);
}
sub fetchLoaderConfigFile
{
my $ldConfFile = shift;
open(LDCONF, "< $ldConfFile");
while(<LDCONF>) {
chomp;
if (/^\s*include\s+(.+?)\s*$/i) {
foreach my $incFile (<$rootPath$1>) {
fetchLoaderConfigFile($incFile);
}
next;
}
if (/\S+/i) {
s[=.+][];
# remove any lib-type specifications (e.g. '=libc5')
push @libFolders, "$rootPath$_";
}
}
close LDCONF;
}
sub fetchLoaderConfig
{
if (!-e "$rootPath/etc/ld.so.conf") {
die _tr("$rootPath/etc/ld.so.conf not found, maybe wrong root-path?\n");
}
fetchLoaderConfigFile("$rootPath/etc/ld.so.conf");
# add "trusted" folders /lib and /usr/lib if not already in place:
if (!grep { m[^$rootPath/lib$]} @libFolders) {
push @libFolders, "$rootPath/lib";
}
if (!grep { m[^$rootPath/usr/lib$] } @libFolders) {
push @libFolders, "$rootPath/usr/lib";
}
}
sub addLib
{
my $lib = shift;
if (!exists $libInfo{$lib}) {
push @libs, $lib;
my $libPath;
foreach my $folder (@libFolders) {
if (-e "$folder/$lib") {
$libPath = "$folder/$lib";
last;
}
}
if (!defined $libPath) {
die _tr("*** unable to find lib %s! ***\n", $lib);
}
print "$libPath\n";
$libInfo{$lib} = $libPath;
addLibsForBinary($libPath);
}
}
sub addLibsForBinary
{
my $binary = shift;
# we try objdump...
my $res = `objdump -p $binary 2>/dev/null`;
if (!$?) {
while($res =~ m[^\s*NEEDED\s*(.+?)\s*$]gm) {
addLib($1);
}
} else {
# ...objdump failed, so we try readelf instead:
$res = `readelf -d $binary 2>/dev/null`;
if ($?) {
die _tr("neither objdump nor readelf seems to be installed, giving up!\n");
}
while($res =~ m{\(NEEDED\)[^\[]+\[(.+?)\]\s*$}gm) {
addLib($1);
}
}
}
__END__
=head1 NAME
slxldd.pl - OpenSLX-script to determine the libraries required by any given
binary file.
=head1 SYNOPSIS
slxldd.pl [options] file [...more files]
Options:
--help brief help message
--root-path=<string> path to the root folder for library search
--version show version
=head1 OPTIONS
=over 8
=item B<--help>
Prints a brief help message and exits.
=item B<--root-path=<string>>
Sets the root folder that is used when searching for libraries. In order to
collect the loader-settings, etc/ld.so.conf is read relative to this path and
all libraries are sought relative to this path, too (a.k.a. a virtual chroot).
=item B<--version>
Prints the version and exits.
=back
=cut
