Class: OsCtld::Assets::CgroupProgram

Inherits:
Assets::Base
  • Object
show all
Includes:
OsCtl::Lib::Utils::Log, OsCtl::Lib::Utils::System
Defined in:
lib/osctld/assets/cgroup_program.rb

Instance Method Summary collapse

Constructor Details

#initialize(cgroup_path, opts) ⇒ CgroupProgram

Returns a new instance of CgroupProgram.

Parameters:

  • opts (Hash) —

    options

Options Hash (opts):

  • program_name (String)
  • attach_type (String)
  • attach_flags (String)
  • optional (Boolean) 


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# File 'lib/osctld/assets/cgroup_program.rb', line 15

def initialize(cgroup_path, opts) # rubocop:disable all
  super
end

Instance Method Details

#exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/assets/cgroup_program.rb', line 19

def exist?
  Dir.exist?(path)
end

#validate(_run) ⇒ Object (protected) 



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# File 'lib/osctld/assets/cgroup_program.rb', line 25

def validate(_run)
  unless exist?
    return if opts[:optional]

    add_error('cgroup not found')
    return
  end

  begin
    res = syscmd("bpftool -j cgroup list #{path}")
  rescue SystemCommandFailed => e
    add_error("bpftool failed: #{e.message}")
    return
  end

  begin
    progs = JSON.parse(res.output)
  rescue TypeError, JSON::ParserError => e
    add_error("failed to parse bpftool output: #{e.message}")
    return
  end

  add_error('more than one program attached') if progs.length > 2

  prog = progs.detect { |v| v['name'] == opts[:program_name] }

  if prog.nil?
    add_error("program #{opts[:program_name]} not attached")
    return
  end

  if opts[:attach_type] && prog['attach_type'] != opts[:attach_type]
    add_error("invalid attach_type: expected #{opts[:attach_type]}, got #{prog['attach_type']}")
  end

  return unless opts[:attach_flags] && prog['attach_flags'] != opts[:attach_flags]

  add_error("invalid attach_flags: expected #{opts[:attach_flags]}, got #{prog['attach_flags']}")
end