146 lines
4 KiB
Perl
146 lines
4 KiB
Perl
# Copyright © 2008-2010, 2012-2015 Guillem Jover <guillem@debian.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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=encoding utf8
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=head1 NAME
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Dpkg::Source::Functions - miscellaneous source package handling functions
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=head1 DESCRIPTION
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This module provides a set of miscellaneous helper functions to handle
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source packages.
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B<Note>: This is a private module, its API can change at any time.
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=cut
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package Dpkg::Source::Functions 0.01;
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use strict;
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use warnings;
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our @EXPORT_OK = qw(
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erasedir
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fixperms
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chmod_if_needed
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fs_time
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is_binary
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);
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use Exporter qw(import);
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use Errno qw(ENOENT);
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use Dpkg::ErrorHandling;
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use Dpkg::Gettext;
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use Dpkg::File;
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use Dpkg::IPC;
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sub erasedir {
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my $dir = shift;
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if (not lstat($dir)) {
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return if $! == ENOENT;
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syserr(g_('cannot stat directory %s (before removal)'), $dir);
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}
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system 'rm', '-rf', '--', $dir;
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subprocerr("rm -rf $dir") if $?;
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if (not stat($dir)) {
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return if $! == ENOENT;
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syserr(g_("unable to check for removal of directory '%s'"), $dir);
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}
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error(g_("rm -rf failed to remove '%s'"), $dir);
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}
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sub fixperms {
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my $dir = shift;
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my ($mode, $modes_set);
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# Unfortunately tar insists on applying our umask _to the original
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# permissions_ rather than mostly-ignoring the original
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# permissions. We fix it up with chmod -R (which saves us some
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# work) but we have to construct a u+/- string which is a bit
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# of a palaver. (Numeric doesn't work because we need [ugo]+X
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# and [ugo]=<stuff> doesn't work because that unsets sgid on dirs.)
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$mode = 0777 & ~umask;
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for my $i (0 .. 2) {
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$modes_set .= ',' if $i;
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$modes_set .= qw(u g o)[$i];
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for my $j (0 .. 2) {
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$modes_set .= $mode & (0400 >> ($i * 3 + $j)) ? '+' : '-';
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$modes_set .= qw(r w X)[$j];
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}
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}
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system('chmod', '-R', '--', $modes_set, $dir);
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subprocerr("chmod -R -- $modes_set $dir") if $?;
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}
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# Only change the pathname permissions if they differ from the desired.
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#
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# To be able to build a source tree, a user needs write permissions on it,
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# but not necessarily ownership of those files.
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sub chmod_if_needed {
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my ($newperms, $pathname) = @_;
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my $oldperms = (stat $pathname)[2] & 07777;
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return 1 if $oldperms == $newperms;
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return chmod $newperms, $pathname;
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}
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# Touch the file and read the resulting mtime.
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#
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# If the file doesn't exist, create it, read the mtime and unlink it.
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#
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# Use this instead of time() when the timestamp is going to be
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# used to set file timestamps. This avoids confusion when an
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# NFS server and NFS client disagree about what time it is.
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sub fs_time {
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my $file = shift;
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my $is_temp = 0;
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if (not -e $file) {
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file_touch($file);
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$is_temp = 1;
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} else {
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utime(undef, undef, $file) or
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syserr(g_('cannot change timestamp for %s'), $file);
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}
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stat($file) or syserr(g_('cannot read timestamp from %s'), $file);
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my $mtime = (stat(_))[9];
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unlink($file) if $is_temp;
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return $mtime;
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}
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sub is_binary {
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my $file = shift;
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# Perform the same check as diff(1), look for a NUL character in the first
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# 4 KiB of the file.
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open my $fh, '<', $file
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or syserr(g_('cannot open file %s for binary detection'), $file);
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read $fh, my $buf, 4096, 0;
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my $res = index $buf, "\0";
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close $fh;
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return $res >= 0;
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}
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=head1 CHANGES
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=head2 Version 0.xx
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This is a private module.
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=cut
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1;
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