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#!/usr/bin/perl # 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 use strict; use warnings; use DebianLinux qw(version_cmp image_list); sub usage { my $fh = shift; print $fh (<< "EOT"); Usage: $0 compare VERSION1 OP VERSION2 $0 sort [--reverse] [VERSION1 VERSION2 ...] $0 list [--paths] The version arguments should be kernel version strings as shown by 'uname -r' and used in filenames. The valid comparison operators are: lt le eq ge gt EOT } sub usage_error { usage(*STDERR{IO}); exit 2; } sub compare_versions { my %op_map = qw(lt < le <= eq == ge >= gt >); # Check arguments if (@_ != 3) { usage_error(); } my ($left, $op, $right) = @_; if (!exists($op_map{$op})) { usage_error(); } my $sign = version_cmp($left, $right); exit !eval("$sign ${op_map{$op}} 0"); } sub sort_versions { # Check for --reverse option my $sign = 1; if (@_ >= 1 and $_[0] eq '--reverse') { $sign = -1; shift; } # Collect versions from argv or stdin (with optional suffix after a space) my @versions; if (@_) { @versions = map({[$_, "\n"]} @_); } else { while (<STDIN>) { /^([^ \n]*)(.*\n?)$/ or die; push @versions, [$1, $2]; } } for (sort({version_cmp($a->[0], $b->[0]) * $sign} @versions)) { print @$_; } exit 0; } sub list_versions { my $show_paths; if (@_ == 1 and $_[0] eq '--paths') { $show_paths = 1; } elsif (@_ != 0) { usage_error(); } for (image_list()) { my ($version, $path) = @$_; if ($show_paths) { print "$version $path\n"; } else { print "$version\n"; } } exit 0; } if (@ARGV == 0) { usage_error(); } my $command = shift; if ($command eq 'help' or grep({$_ eq '--help'} $command, @ARGV)) { usage(*STDOUT{IO}); exit 0; } elsif ($command eq 'compare') { compare_versions(@ARGV); } elsif ($command eq 'sort') { sort_versions(@ARGV); } elsif ($command eq 'list') { list_versions(@ARGV); } usage_error();
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