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package Sys::CmdMod::Plugin::Ionice; |
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{ |
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$Sys::CmdMod::Plugin::Ionice::VERSION = '0.18'; |
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} |
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BEGIN { |
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$Sys::CmdMod::Plugin::Ionice::AUTHORITY = 'cpan:TEX'; |
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} |
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# ABSTRACT: CmdMod plugin for ionice |
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use 5.010_000; |
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use mro 'c3'; |
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use feature ':5.10'; |
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use Moose; |
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use namespace::autoclean; |
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# use IO::Handle; |
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# use autodie; |
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# use MooseX::Params::Validate; |
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use Version::Compare; |
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use Sys::Run; |
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use File::Blarf; |
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extends 'Sys::CmdMod::Plugin'; |
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has 'class' => ( |
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'is' => 'rw', |
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'isa' => 'Int', |
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'default' => 3, |
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); |
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sub _init_priority { return 7; } |
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sub _init_binary { |
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my $self = shift; |
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return $self->_find_binary('ionice'); |
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} |
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sub BUILD { |
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my $self = shift; |
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if ( !-x $self->binary() ) { |
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die( 'Could not find executable at ' . $self->binary() ); |
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} |
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# check prio = 0-7 |
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if ( $self->priority < 0 || $self->priority > 7 ) { |
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die('Invalid priority given. Must be 0-7.'); |
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} |
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# check class = 0-3 |
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if ( $self->class < 0 || $self->class > 3 ) { |
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die('Invalid class given. Must be 0-3.'); |
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} |
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# check kernel |
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my $kernel = $self->_kernel_version(); |
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if ( $kernel && Version::Compare::version_compare( $kernel, '2.6.13' ) < 0 ) { |
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die( 'Running Kernel version (' . $kernel . ') too old to possibly support ionice.' ); |
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} |
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return 1; |
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} |
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sub _kernel_version { |
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my $proc_version = '/proc/version'; |
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if ( -f $proc_version ) { |
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my $kernel_version = File::Blarf::slurp( $proc_version, { Chomp => 1, } ); |
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if ( $kernel_version =~ m/^Linux version (\S+) \(/ ) { |
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return $1; |
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} |
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} ## end if ( -f $proc_version ) |
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return; |
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} |
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sub cmd { |
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my $self = shift; |
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my $cmd = shift; |
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if ( $self->class() == 1 || $self->class() == 2 ) { |
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return $self->binary() . ' -c' . $self->class() . ' -n' . $self->priority() . q{ } . $cmd; |
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} |
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else { |
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return $self->binary() . ' -c' . $self->class() . q{ } . $cmd; |
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} |
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} |
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no Moose; |
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__PACKAGE__->meta->make_immutable; |
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1; |
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__END__ |
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99
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=pod |
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=encoding utf-8 |
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103
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=head1 NAME |
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105
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Sys::CmdMod::Plugin::Ionice - CmdMod plugin for ionice |
106
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107
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=head1 METHODS |
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=head2 BUILD |
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111
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Initialize this module. |
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=head2 cmd |
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Prepend the ionice invocation. |
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=head1 NAME |
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119
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Sys::CmdMod::Plugin::Ionice - ionice support |
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121
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=head1 AUTHOR |
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123
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Dominik Schulz <dominik.schulz@gauner.org> |
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125
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2012 by Dominik Schulz. |
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129
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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=cut |