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# 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::Source::Functions;
use strict;
use warnings;
our $VERSION = "0.01";
use base qw(Exporter);
our @EXPORT_OK = qw(erasedir fixperms is_binary);
use Dpkg::ErrorHandling;
use Dpkg::Gettext;
use Dpkg::IPC;
use POSIX;
sub erasedir {
my ($dir) = @_;
if (not lstat($dir)) {
return if $! == ENOENT;
syserr(_g("cannot stat directory %s (before removal)"), $dir);
}
system 'rm','-rf','--',$dir;
subprocerr("rm -rf $dir") if $?;
if (not stat($dir)) {
return if $! == ENOENT;
syserr(_g("unable to check for removal of dir `%s'"), $dir);
}
error(_g("rm -rf failed to remove `%s'"), $dir);
}
sub fixperms {
my ($dir) = @_;
my ($mode, $modes_set, $i, $j);
# Unfortunately tar insists on applying our umask _to the original
# permissions_ rather than mostly-ignoring the original
# permissions. We fix it up with chmod -R (which saves us some
# work) but we have to construct a u+/- string which is a bit
# of a palaver. (Numeric doesn't work because we need [ugo]+X
# and [ugo]=<stuff> doesn't work because that unsets sgid on dirs.)
$mode = 0777 & ~umask;
for ($i = 0; $i < 9; $i += 3) {
$modes_set .= ',' if $i;
$modes_set .= qw(u g o)[$i/3];
for ($j = 0; $j < 3; $j++) {
$modes_set .= $mode & (0400 >> ($i+$j)) ? '+' : '-';
$modes_set .= qw(r w X)[$j];
}
}
system('chmod', '-R', '--', $modes_set, $dir);
subprocerr("chmod -R -- $modes_set $dir") if $?;
}
sub is_binary($) {
my ($file) = @_;
# TODO: might want to reimplement what diff does, aka checking if the
# file contains \0 in the first 4Kb of data
# Use diff to check if it's a binary file
my $diffgen;
my $diff_pid = spawn(
'exec' => [ 'diff', '-u', '--', '/dev/null', $file ],
'env' => { LC_ALL => 'C', LANG => 'C', TZ => 'UTC0' },
'to_pipe' => \$diffgen
);
my $result = 0;
while (<$diffgen>) {
if (m/^(?:binary|[^-+\@ ].*\bdiffer\b)/i) {
$result = 1;
last;
} elsif (m/^[-+\@ ]/) {
$result = 0;
last;
}
}
close($diffgen) or syserr("close on diff pipe");
wait_child($diff_pid, nocheck => 1, cmdline => "diff -u -- /dev/null $file");
return $result;
}
# vim: set et sw=4 ts=8
1;
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