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#!/usr/bin/perl -w
#
# This program puts humpty-dumpty back together again.
#
# dpkg-repack is Copyright (c) 1996-1999 by Joey Hess <joeyh@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.
#
# 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, write to the Free Software
# Foundation, Inc., 675 Mass Ave., Cambridge, MA 02139, USA.
use strict;
use File::stat;
use vars qw($error_flag $dirty_flag $build_dir $arch $rootdir $packagename
$dpkg_lib);
sub Syntax {
print STDERR <<eof;
Usage: dpkg-repack [--root=dir] packagename [packagename ..]
--root=dir Take package from filesystem rooted on <dir>.
--arch=arch Force the parch to be built for architecture <arch>.
packagename The name of the package to attempt to repack.
eof
}
sub Error {
print STDERR "dpkg-repack: @_\n";
$error_flag=1;
}
sub Die {
Error('Fatal Error:',@_);
CleanUp();
exit 1;
}
# Print out a status line.
sub Status { my $message=shift;
print "-- $message\n";
}
# Run a system command, and print an error message if it fails.
sub SafeSystem {
my $errormessage=pop @_;
my $ret=system @_;
if (int($ret/256) > 0) {
$errormessage="Error running: ".join(' ', @_) if !$errormessage;
Error($errormessage);
}
}
# Make the passed directory, print an error message if it fails.
sub SafeMkdir {
my ($dir,$perms)=@_;
mkdir $dir,$perms || Error("Unable to make directory, \"$dir\": $!");
}
# This removes the temporary directory where we built the package.
sub CleanUp {
if ($dirty_flag) {
SafeSystem("rm","-rf",$build_dir,
"Unable to remove $build_dir ($!). Please remove it by hand.");
}
}
# This makes the directories we will rebuild the package in.
sub Make_Dirs {
$dirty_flag=1;
SafeMkdir $build_dir,0755;
SafeMkdir "$build_dir/DEBIAN",0755;
}
# Get package control file via dpkg -s.
sub Extract_Control {
my $info=`dpkg --root=$rootdir/ -s $packagename |grep -v "^Status:"`;
chomp $info;
# Add an Architecture: field
if (!$arch) {
$arch=`dpkg --print-installation-architecture`;
chomp $arch;
}
$info.="Architecture: $arch\n";
return $info;
}
# Install the control file. Pass it the text of the file.
sub Install_Control {
my $control=shift;
open (CONTROL,">$build_dir/DEBIAN/control")
|| Die "Can't write to $build_dir/DEBIAN/control";
print CONTROL $control;
close CONTROL;
}
# Install all the files in the DEBIAN directory. (Except control file and
# file list file.)
sub Install_DEBIAN {
foreach my $fn (glob("$dpkg_lib/info/$packagename.*")) {
my ($basename)=$fn=~m/^.*\.(.*?)$/;
if ($basename ne 'list') {
SafeSystem "cp","-p",$fn,"$build_dir/DEBIAN/$basename","";
}
}
}
# This looks at the list of files in this package, and places them
# all on the directory tree.
sub Install_Files {
# I need a list of all the files, for later lookups
# when I test to see where symlinks point to.
# Note that because I parse the output of the command (for
# diversions, below) it's important to make sure it runs with English
# language output.
my $lc_all=$ENV{LC_ALL};
$ENV{LC_ALL}='C';
my @filelist=split /\n/,`dpkg --root=$rootdir/ -L $packagename`;
$ENV{LC_ALL}=$lc_all if defined $lc_all; # important to reset it.
# Set up a hash for easy lookups.
my %filelist = map { $_ => 1 } @filelist;
my $fn;
for (my $x=0;$x<=$#filelist;$x++) {
my $origfn=$filelist[$x];
# dpkg -L spits out extra lines to report diversions.
# we have to parse those (ugly..), to find out where the
# file was diverted to, and use the diverted file.
if (defined $filelist[$x+1] &&
($filelist[$x+1]=~m/locally diverted to: (.*)/ ||
$filelist[$x+1]=~m/diverted by .*? to: (.*)/)) {
$fn="$rootdir/$1";
$x++; # skip over that line.
}
else {
$fn="$rootdir/$origfn";
}
if (!-e $fn && !-l $fn) {
Error "File not found: $fn"
}
elsif ((-d $fn and !-l $fn) or
(-d $fn and -l $fn and !$filelist{readlink($fn)}
and $filelist[$x+1]=~m/^\Q$origfn\E\//)) {
# See the changelog for version 0.17 for an
# explanation of what I'm doing here with
# directory symlinks. I rely on the order of the
# filelist listing parent directories first, and
# then their contents.
# There has to be a better way to do this!
my $st=stat($fn);
SafeMkdir "$build_dir/$origfn",$st->mode;
# mkdir doesn't do sticky bits and suidness.
chmod $st->mode, "$build_dir/$origfn";
}
else {
SafeSystem "cp","-pd",$fn,"$build_dir/$origfn","";
}
}
}
# Parse parameters.
use Getopt::Long;
$rootdir='';
my $ret=&GetOptions(
"root|r=s", \$rootdir,
"arch|a=s", \$arch,
);
if (!@ARGV || !$ret) {
Syntax();
exit 1;
}
$dpkg_lib=$rootdir.'/var/lib/dpkg';
$build_dir="./dpkg-repack-$$";
# Some sanity checks.
if ($> ne 0) { Die "This program should be run as root (or you could use fakeroot, but that will not always work). Aborting." }
foreach $packagename (@ARGV) {
my $control=Extract_Control();
if (!$control) { Die "Unable to locate $packagename in the package list." }
# If the umask is set wrong, the directories will end up with the wrong
# perms. (Is this still needed?)
umask 022;
# Generate the directory tree.
Status("Creating control files");
Make_Dirs();
Install_DEBIAN();
Install_Control($control);
Status("Copying files");
Install_Files();
# Let dpkg do its magic.
Status("Building package");
SafeSystem("dpkg","--build",$build_dir,".","");
# Finish up.
Status("Cleaning up");
CleanUp();
if ($error_flag) {
Error("Errors were encountered in processing.");
Error("The package may not unpack correctly.");
}
else {
Status("Package build successful");
}
}
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