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#!/usr/bin/perl
#
# Copyright 2007-2008 Kees Cook <kees@ubuntu.com>
#
# ##################################################################
#
# 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 3
# 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.
#
# See file /usr/share/common-licenses/GPL for more details.
#
# ##################################################################
#
# This script attempts to find and download a specific version of a Debian
# package and its immediate parent to generate a debdiff.
#
# Requirements: devscripts diffstat dpkg-dev
use strict;
use warnings;
sub geturls
{
my ($urlbase,$pkg,$version)=@_;
my $file;
$file = "${pkg}_${version}.dsc";
print "Want '$file'\n";
if (! -r "$file") {
warn "Trying $urlbase/$file ...\n";
system("wget $urlbase/$file");
return 0 if ($? != 0);
}
# Parse the .dsc file for list of required files...
my @needed;
open(DSC,"$file") || return 0;
while (my $line=<DSC>) {
if ($line =~ /^Files:/) {
while (my $file=<DSC>) {
chomp($file);
last if ($file !~ /^ /);
my @parts = split(/\s+/,$file);
my $want = pop(@parts);
print "Want '$want'\n";
push(@needed,$want);
}
}
}
close(DSC);
foreach my $file (@needed) {
if (! -r "$file") {
warn "Pulling $urlbase/$file ...\n";
system("wget $urlbase/$file");
return 0 if ($? != 0);
}
}
return 1;
}
sub generate_base
{
my ($pkg)=@_;
my @path;
push(@path,"main");
if ($pkg =~ /^(lib.)/) {
push(@path,$1);
}
else {
push(@path,substr($pkg,0,1));
}
push(@path,$pkg);
return join("/",@path);
}
sub download_source
{
my ($pkg,$version)=@_;
my $urlbase;
my $base = generate_base($pkg);
# Attempt to pull from security updates first
$urlbase = "http://security.debian.org/pool/updates/$base";
if (!geturls($urlbase,$pkg,$version)) {
# Try regular pool
$urlbase = "http://ftp.debian.org/debian/pool/$base";
if (!geturls($urlbase,$pkg,$version)) {
# Try snapshot
$urlbase="http://snapshot.debian.net/package/$pkg/$version";
warn "Fetching snapshot url via '$urlbase' ...\n";
$urlbase=`curl -sI 'http://snapshot.debian.net/package/$pkg/$version' | grep ^[lL]ocation | cut -d' ' -f2 | head -1`;
$urlbase =~ s/[\r\n]//g;
warn "Trying snapshot location '$urlbase' ...\n";
if ($urlbase ne "" && !geturls($urlbase,$pkg,$version)) {
return 0;
}
}
}
return 1;
}
my $pkg = $ARGV[0];
my $version = $ARGV[1];
my $just_fetch = ($ARGV[2] && $ARGV[2] eq "--fetch");
my $skip = $ARGV[2] || 1;
$skip+=0;
if (!defined($pkg) || !defined($version)) {
die "Usage: $0 PKG VERSION\n";
}
# Extract latest source
die "Cannot locate $pkg $version\n" unless download_source($pkg,$version);
exit(0) if ($just_fetch);
system("dpkg-source -x ${pkg}_${version}.dsc");
die "Unpack of $pkg $version failed\n" unless ($? == 0);
# Locate prior changelog entry
my $prev_ver;
my $upstream_version = $version;
if ($upstream_version =~ /^([^-]+)-/) {
$upstream_version = $1;
}
my $srcdir="$pkg-$upstream_version";
if (! -d "$srcdir") {
undef $srcdir;
my $dir;
opendir(DIR,".");
while ($dir = readdir(DIR)) {
if ($dir =~ /^${pkg}-/ && -d $dir) {
$srcdir = $dir;
last;
}
}
closedir(DIR);
}
die "Cannot locate source tree\n" if (!defined($srcdir));
my $log = "$srcdir/debian/changelog";
open(LOG,"<$log") || die "$log: $!\n";
while (my $line=<LOG>) {
if ($line =~ /^$pkg \((?:\d+:)?([^\)]+)\)/) {
my $seen = $1;
if ($seen ne $version) {
$skip--;
if ($skip==0) {
$prev_ver=$seen;
last;
}
}
}
}
close(LOG);
die "Cannot find earlier source version\n" if (!defined($prev_ver));
die "Cannot locate $pkg $prev_ver\n" unless download_source($pkg,$prev_ver);
#system("dpkg-source -x ${pkg}_${prev_ver}.dsc");
#die "Unpack of $pkg $prev_ver failed\n" unless ($? == 0);
system("debdiff ${pkg}_${prev_ver}.dsc ${pkg}_${version}.dsc > ${pkg}_${version}.debdiff");
die "Cannot debdiff\n" unless ($? == 0);
system("diffstat -p0 ${pkg}_${version}.debdiff");
print "${pkg}_${version}.debdiff\n";
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