Class: LVM::LVM

Inherits:
Object
  • Object
show all
Defined in:
lib/lvm.rb

Constant Summary collapse

VALID_OPTIONS = 
[
  :command,
  :version,
  :debug
]
DEFAULT_COMMAND = 
'/sbin/lvm'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ LVM

Returns a new instance of LVM.



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# File 'lib/lvm.rb', line 24

def initialize(options={})
  # handy, thanks net-ssh!
  invalid_options = options.keys - VALID_OPTIONS
  if invalid_options.any?
    raise ArgumentError, "invalid option(s): #{invalid_options.join(', ')}"
  end

  @command = options[:command] || DEFAULT_COMMAND

  # default to loading attributes for the current version
  options[:version] ||= version 
  options[:debug] ||= false

  @logical_volumes = LogicalVolumes.new(options)
  @volume_groups = VolumeGroups.new(options)
  @physical_volumes = PhysicalVolumes.new(options)

  if block_given?
    yield self
  else
    return self
  end
end

Instance Attribute Details

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/lvm.rb', line 11

def command
  @command
end

#logical_volumes ⇒ Object (readonly)

Returns the value of attribute logical_volumes.



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# File 'lib/lvm.rb', line 12

def logical_volumes
  @logical_volumes
end

#physical_volumes ⇒ Object (readonly)

Returns the value of attribute physical_volumes.



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# File 'lib/lvm.rb', line 14

def physical_volumes
  @physical_volumes
end

#volume_groups ⇒ Object (readonly)

Returns the value of attribute volume_groups.



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# File 'lib/lvm.rb', line 13

def volume_groups
  @volume_groups
end

Instance Method Details

#raw(args) ⇒ Object 



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# File 'lib/lvm.rb', line 48

def raw(args)
  output = []
  External.cmd("#{@command} #{args}") do |line|
    output << line
  end
  if block_given?
    return output.each { |l| yield l }
  else
    return output.join
  end
end

#userland ⇒ Object

helper methods



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# File 'lib/lvm.rb', line 65

def userland
  userland = UserLand.new
  raw('version') do |line|
    case line
    when  %r{^\s+LVM version:\s+([0-9].*)$}
      userland.lvm_version = $1
    when %r{^\s+Library version:\s+([0-9].*)$}
      userland.library_version = $1
    when  %r{^\s+Driver version:\s+([0-9].*)$}
      userland.driver_version = $1
    end
  end

  return userland
end

#version ⇒ Object 



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# File 'lib/lvm.rb', line 60

def version
  %r{^(.*?)(-| )}.match(userland.lvm_version)[1]
end