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# Copyright © 2008 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::Source::Archive;
use strict;
use warnings;
our $VERSION = '0.01';
use Dpkg::Source::Functions qw(erasedir fixperms);
use Dpkg::Gettext;
use Dpkg::IPC;
use Dpkg::ErrorHandling;
use Carp;
use File::Temp qw(tempdir);
use File::Basename qw(basename);
use File::Spec;
use Cwd;
use parent qw(Dpkg::Compression::FileHandle);
sub create {
my ($self, %opts) = @_;
$opts{options} ||= [];
my %spawn_opts;
# Possibly run tar from another directory
if ($opts{chdir}) {
$spawn_opts{chdir} = $opts{chdir};
*$self->{chdir} = $opts{chdir};
}
# Redirect input/output appropriately
$self->ensure_open('w');
$spawn_opts{to_handle} = $self->get_filehandle();
$spawn_opts{from_pipe} = \*$self->{tar_input};
# Call tar creation process
$spawn_opts{delete_env} = [ 'TAR_OPTIONS' ];
$spawn_opts{exec} = [ 'tar', '--null', '-T', '-', '--numeric-owner',
'--owner', '0', '--group', '0',
@{$opts{options}}, '-cf', '-' ];
*$self->{pid} = spawn(%spawn_opts);
*$self->{cwd} = getcwd();
}
sub _add_entry {
my ($self, $file) = @_;
my $cwd = *$self->{cwd};
croak 'call create() first' unless *$self->{tar_input};
$file = $2 if ($file =~ /^\Q$cwd\E\/(.+)$/); # Relative names
print({ *$self->{tar_input} } "$file\0")
or syserr(_g('write on tar input'));
}
sub add_file {
my ($self, $file) = @_;
my $testfile = $file;
if (*$self->{chdir}) {
$testfile = File::Spec->catfile(*$self->{chdir}, $file);
}
croak 'add_file() does not handle directories'
if not -l $testfile and -d _;
$self->_add_entry($file);
}
sub add_directory {
my ($self, $file) = @_;
my $testfile = $file;
if (*$self->{chdir}) {
$testfile = File::Spec->catdir(*$self->{chdir}, $file);
}
croak 'add_directory() only handles directories'
if -l $testfile or not -d _;
$self->_add_entry($file);
}
sub finish {
my ($self) = @_;
close(*$self->{tar_input}) or syserr(_g('close on tar input'));
wait_child(*$self->{pid}, cmdline => 'tar -cf -');
delete *$self->{pid};
delete *$self->{tar_input};
delete *$self->{cwd};
delete *$self->{chdir};
$self->close();
}
sub extract {
my ($self, $dest, %opts) = @_;
$opts{options} ||= [];
$opts{in_place} ||= 0;
$opts{no_fixperms} ||= 0;
my %spawn_opts = (wait_child => 1);
# Prepare destination
my $tmp;
if ($opts{in_place}) {
$spawn_opts{chdir} = $dest;
$tmp = $dest; # So that fixperms call works
} else {
my $template = basename($self->get_filename()) . '.tmp-extract.XXXXX';
unless (-e $dest) {
# Kludge so that realpath works
mkdir($dest) or syserr(_g('cannot create directory %s'), $dest);
}
$tmp = tempdir($template, DIR => Cwd::realpath("$dest/.."), CLEANUP => 1);
$spawn_opts{chdir} = $tmp;
}
# Prepare stuff that handles the input of tar
$self->ensure_open('r');
$spawn_opts{from_handle} = $self->get_filehandle();
# Call tar extraction process
$spawn_opts{delete_env} = [ 'TAR_OPTIONS' ];
$spawn_opts{exec} = [ 'tar', '--no-same-owner', '--no-same-permissions',
@{$opts{options}}, '-xf', '-' ];
spawn(%spawn_opts);
$self->close();
# Fix permissions on extracted files because tar insists on applying
# our umask _to the original permissions_ rather than mostly-ignoring
# the original permissions.
# We still need --no-same-permissions because otherwise tar might
# extract directory setgid (which we want inherited, not
# extracted); we need --no-same-owner because putting the owner
# back is tedious - in particular, correct group ownership would
# have to be calculated using mount options and other madness.
fixperms($tmp) unless $opts{no_fixperms};
# Stop here if we extracted in-place as there's nothing to move around
return if $opts{in_place};
# Rename extracted directory
opendir(my $dir_dh, $tmp) or syserr(_g('cannot opendir %s'), $tmp);
my @entries = grep { $_ ne '.' && $_ ne '..' } readdir($dir_dh);
closedir($dir_dh);
my $done = 0;
erasedir($dest);
if (scalar(@entries) == 1 && ! -l "$tmp/$entries[0]" && -d _) {
rename("$tmp/$entries[0]", $dest)
or syserr(_g('unable to rename %s to %s'),
"$tmp/$entries[0]", $dest);
} else {
rename($tmp, $dest)
or syserr(_g('unable to rename %s to %s'), $tmp, $dest);
}
erasedir($tmp);
}
1;