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Diffstat (limited to 'scripts/Dpkg/Source/Functions.pm')
| -rw-r--r-- | scripts/Dpkg/Source/Functions.pm | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/scripts/Dpkg/Source/Functions.pm b/scripts/Dpkg/Source/Functions.pm new file mode 100644 index 0000000..3435f6c --- /dev/null +++ b/scripts/Dpkg/Source/Functions.pm @@ -0,0 +1,124 @@ +# Copyright © 2008-2010, 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/>. + +package Dpkg::Source::Functions; + +use strict; +use warnings; + +our $VERSION = '0.01'; +our @EXPORT_OK = qw( + erasedir + fixperms + chmod_if_needed + fs_time + is_binary +); + +use Exporter qw(import); +use Errno qw(ENOENT); + +use Dpkg::ErrorHandling; +use Dpkg::Gettext; +use Dpkg::IPC; + +sub erasedir { + my $dir = shift; + if (not lstat($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 directory '%s'"), $dir); + } + error(g_("rm -rf failed to remove '%s'"), $dir); +} + +sub fixperms { + my $dir = shift; + my ($mode, $modes_set); + # 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 my $i (0 .. 2) { + $modes_set .= ',' if $i; + $modes_set .= qw(u g o)[$i]; + for my $j (0 .. 2) { + $modes_set .= $mode & (0400 >> ($i * 3 + $j)) ? '+' : '-'; + $modes_set .= qw(r w X)[$j]; + } + } + system('chmod', '-R', '--', $modes_set, $dir); + subprocerr("chmod -R -- $modes_set $dir") if $?; +} + +# Only change the pathname permissions if they differ from the desired. +# +# To be able to build a source tree, a user needs write permissions on it, +# but not necessarily ownership of those files. +sub chmod_if_needed { + my ($newperms, $pathname) = @_; + my $oldperms = (stat $pathname)[2] & 07777; + + return 1 if $oldperms == $newperms; + return chmod $newperms, $pathname; +} + +# Touch the file and read the resulting mtime. +# +# If the file doesn't exist, create it, read the mtime and unlink it. +# +# Use this instead of time() when the timestamp is going to be +# used to set file timestamps. This avoids confusion when an +# NFS server and NFS client disagree about what time it is. +sub fs_time($) { + my $file = shift; + my $is_temp = 0; + if (not -e $file) { + open(my $temp_fh, '>', $file) or syserr(g_('cannot write %s')); + close($temp_fh); + $is_temp = 1; + } else { + utime(undef, undef, $file) or + syserr(g_('cannot change timestamp for %s'), $file); + } + stat($file) or syserr(g_('cannot read timestamp from %s'), $file); + my $mtime = (stat(_))[9]; + unlink($file) if $is_temp; + return $mtime; +} + +sub is_binary($) { + my $file = shift; + + # Perform the same check as diff(1), look for a NUL character in the first + # 4 KiB of the file. + open my $fh, '<', $file + or syserr(g_('cannot open file %s for binary detection'), $file); + read $fh, my $buf, 4096, 0; + my $res = index $buf, "\0"; + close $fh; + + return $res >= 0; +} + +1; |