debian-cd-clone/tools/which_deb

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#!/usr/bin/perl -w
#
# which_deb
#
# Simple helper tool to find the appropriate version of a package in
# the archive to meet a requirement in the debian-cd build
use strict;
use List::Util qw{first};
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my ($mirror, $codename, $pkg, $pth, $output, $text_out);
$mirror = shift;
$codename = shift;
$pkg = shift;
$output = shift;
$pth = "$mirror/dists/$codename";
$text_out = "";
my @components = qw(main);
push @components, 'contrib' if $ENV{CONTRIB};
push @components, 'non-free' if $ENV{NONFREE};
push @components, 'local' if $ENV{LOCAL};
if (!defined ($output)) {
$output = "binary";
}
# Give preference to i386 and amd64, if specified
my @ARCHES;
if ( $ENV{ARCHES} ) {
push @ARCHES, 'i386' if $ENV{ARCHES} =~ /(^|\s)i386(\s|$)/;
push @ARCHES, 'amd64' if $ENV{ARCHES} =~ /(^|\s)amd64(\s|$)/;
push @ARCHES, grep { !/^(source|i386|amd64)$/ } split /\s+/, $ENV{ARCHES};
}
# We seem to be building a source-only CD. Check for whatever binary
# arches exist in the archive; #695244
if (!@ARCHES) {
my %found_arches;
my $dh;
for my $component(@components) {
opendir ($dh, "$pth/$component");
if ($dh) {
while (my $entry = readdir $dh) {
$entry =~ /^binary-(.*)/ and $1 !~ /all/ and $found_arches{$1} = 1;
}
}
close $dh;
}
if ($found_arches{"i386"}) {
push @ARCHES, 'i386';
}
if ($found_arches{"amd64"}) {
push @ARCHES, 'amd64';
}
for my $arch (sort keys %found_arches) {
push @ARCHES, $arch;
}
}
sub grab_bin_info {
my $pth = shift;
my $arch = shift;
my $pkgname = shift;
my $old_split = $/;
my $match;
my $result = "";
$/ = ''; # Browse by paragraph
for my $component ( @components ) {
my $pgz = "$pth/$component/binary-$arch/Packages.gz";
if ( $component eq 'local' and $ENV{LOCALDEBS} ) {
$pgz = "$ENV{LOCALDEBS}/dists/$codename/local/binary-$arch/Packages.gz";
}
my $pxz = "$pth/$component/binary-$arch/Packages.xz";
if ( $component eq 'local' and $ENV{LOCALDEBS} ) {
$pxz = "$ENV{LOCALDEBS}/dists/$codename/local/binary-$arch/Packages.xz";
}
if (-e $pgz) {
open(PFILE, "zcat $pgz |") or
die "Failed to read Packages file $pgz";
} elsif (-e $pxz) {
open(PFILE, "xzcat $pxz |") or
die "Failed to read Packages file $pxz";
} else {
die "Can't find a working Packages file, tried $pgz and $pxz\n";
}
while (defined($match = <PFILE>)) {
if (($match =~ /^Package: \Q$pkgname\E$/m)) {
$result = $match;
close PFILE;
return $result;
}
}
close PFILE;
}
return "";
}
sub grab_src_info {
my $pth = shift;
my $pkgname = shift;
my $old_split = $/;
my $match;
my $result = "";
$/ = ''; # Browse by paragraph
for my $component ( @components ) {
my $pgz = "$pth/$component/source/Sources.gz";
my $pxz = "$pth/$component/source/Sources.xz";
if (-e $pgz) {
open(PFILE, "zcat $pgz |") or
die "Failed to read Sources file $pgz";
} elsif (-e $pxz) {
open(PFILE, "xzcat $pxz |") or
die "Failed to read Sources file $pxz";
} else {
die "Can't find a working Sources file, tried $pgz and $pxz\n";
}
while (defined($match = <PFILE>)) {
if (($match =~ /^Package: \Q$pkgname\E$/m)) {
$result = "$result" . $match;
}
}
close PFILE;
}
return $result;
}
my $bin_deb = "";
my $pkgdata = "";
my $srcname = "";
if ($pkg eq "syslinux") {
first { $pkgdata = grab_bin_info($pth, $_, "syslinux-common") } @ARCHES;
if (length($pkgdata) < 3) {
first { $pkgdata = grab_bin_info($pth, $_, "syslinux") } @ARCHES;
}
} elsif ($pkg eq "delo") {
$pkgdata = grab_bin_info($pth, "mipsel", $pkg);
} else { # Fallthrough for all other packages
first { $pkgdata = grab_bin_info($pth, $_, $pkg) } @ARCHES;
}
if (length($pkgdata) > 2) {
if ($output eq "binary") {
$pkgdata =~ m/^Filename: (\S+)/m and $bin_deb = $1;
$text_out = "$bin_deb\n";
}
elsif ($output eq "source") {
$srcname = $pkg;
$pkgdata =~ m/^Source: (\S+)/m and $srcname = $1;
$pkgdata = grab_src_info($pth, $srcname);
if (length($pkgdata) > 2) {
my $dir;
$pkgdata =~ m/^Directory: (\S+)/m and $dir = $1;
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# Explicitly use the md5 lines in the Sources stanza, hence the xdigit(32) here
while ($pkgdata =~ m/^ ([[:xdigit:]]{32}) (\d+) (\S+)/msg) {
$text_out = $text_out . "$dir/$3\n";
}
}
}
}
if (length($text_out) < 2) {
die "which_deb: can't find $output file(s) for $pkg in $codename\n";
}
print $text_out;