# Copyright 2011 Ben Hutchings
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
package DebianLinux;
use strict;
use warnings;
use POSIX qw(uname);
use FileHandle;
BEGIN {
use Exporter ();
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(version_cmp image_stem image_list read_kernelimg_conf);
}
sub version_split {
# Split into numbers and non-numeric strings, but break the non-
# numeric strings at hyphens
my $version = shift;
return $version =~ /(?:\d+|-?[^-\d]*)/g;
}
sub version_cmp {
my ($left_ver, $right_ver) = @_;
my @left_comp = version_split($left_ver);
my @right_comp = version_split($right_ver);
for (my $i = 0; ; $i++) {
my $left = $left_comp[$i];
my $right = $right_comp[$i];
# Do the components indicate pre-releases?
my $left_pre = defined($left) && $left =~ /^-(?:rc|trunk)$/;
my $right_pre = defined($right) && $right =~ /^-(?:rc|trunk)$/;
# Are the components numeric?
my $left_num = defined($left) && $left =~ /^\d+/;
my $right_num = defined($right) && $right =~ /^\d+/;
# Pre-releases sort before anything, even end-of-string
if ($left_pre or $right_pre) {
return -1 if !$right_pre;
return 1 if !$left_pre;
}
# End-of-string sorts before anything else.
# End-of-string on both sides means equality.
if (!defined($left) or !defined($right)) {
return -1 if defined($right);
return defined($left) || 0;
}
# Use numeric comparison if both sides numeric.
# Otherwise use ASCII comparison.
if ($left_num && $right_num) {
return -1 if $left < $right;
return 1 if $left > $right;
} else {
# Note that '.' > '-' thus 2.6.x.y > 2.6.x-z for any y, z.
return -1 if $left lt $right;
return 1 if $left gt $right;
}
}
}
# Find kernel image name stem for this architecture
my $image_stem;
if ((uname())[4] =~ /^(?:mips|parisc|powerpc|ppc)/) {
$image_stem = 'vmlinux';
} else {
$image_stem = 'vmlinuz';
}
sub image_stem {
return $image_stem;
}
sub image_list {
my @results;
my $prefix = "/boot/$image_stem-";
for (glob("$prefix*")) {
push @results, [substr($_, length($prefix)), $_];
}
return @results;
}
sub read_kernelimg_conf {
my $conf_loc = shift || '/etc/kernel-img.conf';
my @bool_param = qw(do_symlinks link_in_boot no_symlinks);
my @path_param = qw(image_dest);
# These are still set in the jessie installer even though they
# have no effect. Ignore them quietly.
my @quiet_param = qw(do_bootloader do_initrd);
# These are used only by kernel-package, and are not relevant to
# anything that linux-base does. Ignore them quietly.
push @quiet_param, qw(clobber_modules force_build_link
relink_build_link relink_src_link
silent_modules warn_reboot);
# Initialise configuration to defaults
my $conf = {
do_symlinks => 1,
image_dest => '/',
link_in_boot => 1,
no_symlinks => 0,
};
if (my $fh = new FileHandle($conf_loc, 'r')) {
while (<$fh>) {
# Delete line endings, comments and blank lines
chomp;
s/\#.*$//g;
next if /^\s*$/;
# Historically this was done by matching against one
# (path) or two (bool) regexps per parameter, with no
# attempt to ensure that each line matched one. We now
# warn about syntax errors, but for backward compatibility
# we never treat them as fatal.
# Parse into name = value
if (!/^\s*(\w+)\s*=\s*(.*)/) {
print STDERR "$conf_loc:$.: W: ignoring line with syntax error\n";
next;
}
my ($name, $value) = (lc($1), $2);
# Parse value according to expected type
if (grep({$_ eq $name} @bool_param)) {
if ($value =~ /^(?:no|false|0)\s*$/i) {
$conf->{$name} = 0;
} elsif ($value =~ /^(?:yes|true|1)\s*$/i) {
$conf->{$name} = 1;
} else {
print STDERR "$conf_loc:$.: W: ignoring invalid value for $name\n";
}
} elsif (grep({$_ eq $name} @path_param)) {
# Only one space-separated word is supported
$value =~ /^(\S*)(.*)/;
($conf->{$name}, my $excess) = ($1, $2);
if ($excess =~ /\S/) {
print STDERR "$conf_loc:$.: W: ignoring excess values for $name\n";
}
} elsif (grep({$_ eq $name} @quiet_param)) {
;
} else {
print STDERR "$conf_loc:$.: W: ignoring unknown parameter $name\n";
}
}
$fh->close();
}
# This is still set (to 0) by default in jessie so we should only
# warn if the default is changed
if ($conf->{no_symlinks}) {
print STDERR "$conf_loc: W: ignoring no_symlinks; only symlinks are supported\n";
}
delete $conf->{no_symlinks};
if ($conf->{link_in_boot}) {
$conf->{image_dest} = '/boot';
}
delete $conf->{link_in_boot};
return $conf;
}
1;
Mini Shell