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Diffstat (limited to 'scripts/Dpkg/Shlibs.pm')
| -rw-r--r-- | scripts/Dpkg/Shlibs.pm | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/scripts/Dpkg/Shlibs.pm b/scripts/Dpkg/Shlibs.pm new file mode 100644 index 0000000..9c245ec --- /dev/null +++ b/scripts/Dpkg/Shlibs.pm @@ -0,0 +1,212 @@ +# Copyright © 2007, 2016 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/>. + +=encoding utf8 + +=head1 NAME + +Dpkg::Shlibs - shared library location handling + +=head1 DESCRIPTION + +This module provides functions to locate shared libraries. + +B<Note>: This is a private module, its API can change at any time. + +=cut + +package Dpkg::Shlibs 0.03; + +use strict; +use warnings; +use feature qw(state); + +our @EXPORT_OK = qw( + blank_library_paths + setup_library_paths + get_library_paths + add_library_dir + find_library +); + +use Exporter qw(import); +use List::Util qw(none); +use File::Spec; + +use Dpkg::Gettext; +use Dpkg::ErrorHandling; +use Dpkg::Shlibs::Objdump; +use Dpkg::BuildAPI qw(get_build_api); +use Dpkg::Path qw(resolve_symlink canonpath); +use Dpkg::Arch qw(get_build_arch get_host_arch :mappers); + +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); + +# Library paths set by the user. +my @custom_librarypaths; +# Library paths from the system. +my @system_librarypaths; +my $librarypaths_init; + +sub parse_ldso_conf { + my $file = shift; + state %visited; + 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 } (@custom_librarypaths, @system_librarypaths)) { + push @system_librarypaths, $libdir; + } + } + } + close $fh; +} + +sub blank_library_paths { + @custom_librarypaths = (); + @system_librarypaths = (); + $librarypaths_init = 1; +} + +sub setup_library_paths { + @custom_librarypaths = (); + @system_librarypaths = (); + + # XXX: Deprecated. Update library paths with LD_LIBRARY_PATH. + if ($ENV{LD_LIBRARY_PATH}) { + require Cwd; + my $cwd = Cwd::getcwd; + + foreach my $path (split /:/, $ENV{LD_LIBRARY_PATH}) { + $path =~ s{/+$}{}; + + my $realpath = Cwd::realpath($path); + next unless defined $realpath; + if ($realpath =~ m/^\Q$cwd\E/) { + if (get_build_api() >= 1) { + error(g_('use -l option instead of LD_LIBRARY_PATH')); + } else { + warning(g_('deprecated use of LD_LIBRARY_PATH with private ' . + 'library directory which interferes with ' . + 'cross-building, please use -l option instead')); + } + } + + next if get_build_api() >= 1; + + # XXX: This should be added to @custom_librarypaths, but as this + # is deprecated we do not care as the code will go away. + push @system_librarypaths, $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 @system_librarypaths, "/lib/$multiarch", "/usr/lib/$multiarch"; + } + + push @system_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 @system_librarypaths, DEFAULT_MULTILIB_PATH; + + $librarypaths_init = 1; +} + +sub add_library_dir { + my $dir = shift; + + setup_library_paths() if not $librarypaths_init; + + push @custom_librarypaths, $dir; +} + +sub get_library_paths { + setup_library_paths() if not $librarypaths_init; + + return (@custom_librarypaths, @system_librarypaths); +} + +# find_library ($soname, \@rpath, $format, $root) +sub find_library { + my ($lib, $rpath, $format, $root) = @_; + + setup_library_paths() if not $librarypaths_init; + + my @librarypaths = (@{$rpath}, @custom_librarypaths, @system_librarypaths); + my @libs; + + $root //= ''; + $root =~ s{/+$}{}; + foreach my $dir (@librarypaths) { + my $checkdir = "$root$dir"; + if (-e "$checkdir/$lib") { + my $libformat = Dpkg::Shlibs::Objdump::get_format("$checkdir/$lib"); + if (not defined $libformat) { + warning(g_("unknown executable format in file '%s'"), "$checkdir/$lib"); + } elsif ($format eq $libformat) { + push @libs, canonpath("$checkdir/$lib"); + } else { + debug(1, "Skipping lib $checkdir/$lib, libabi=<%s> != objabi=<%s>", + $libformat, $format); + } + } + } + return @libs; +} + +=head1 CHANGES + +=head2 Version 0.xx + +This is a private module. + +=cut + +1; |