Class: LinuxAdmin::Disk

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

Constant Summary collapse

PARTED_FIELDS = 
[:id, :start_sector, :end_sector,
:size, :partition_type, :fs_type]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Disk

Returns a new instance of Disk.



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# File 'lib/linux_admin/disk.rb', line 17

def initialize(args = {})
  @path = args[:path]
end

Instance Attribute Details

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/linux_admin/disk.rb', line 9

def path
  @path
end

Class Method Details

.local ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 11

def self.local
  Dir.glob(['/dev/[vhs]d[a-z]', '/dev/xvd[a-z]']).collect do |d|
    Disk.new :path => d
  end
end

Instance Method Details

#clear! ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 92

def clear!
  @partitions = []

  # clear partition table
  Common.run!(Common.cmd(:dd),
      :params => { 'if=' => '/dev/zero', 'of=' => @path,
                   'bs=' => 512, 'count=' => 1})

  self
end

#create_partition(partition_type, *args) ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 52

def create_partition(partition_type, *args)
  create_partition_table unless has_partition_table?

  start = finish = size = nil
  case args.length
  when 1 then
    start  = partitions.empty? ? 0 : partitions.last.end_sector
    size   = args.first
    finish = start + size

  when 2 then
    start  = args[0]
    finish = args[1]

  else
    raise ArgumentError, "must specify start/finish or size"
  end

  id = partitions.empty? ? 1 : (partitions.last.id + 1)
  options = parted_options_array('mkpart', '-a', 'opt', partition_type, start, finish)
  Common.run!(Common.cmd(:parted), :params => {nil => options})

  partition = Partition.new(:disk           => self,
                            :id             => id,
                            :start_sector   => start,
                            :end_sector     => finish,
                            :size           => size,
                            :partition_type => partition_type)
  partitions << partition
  partition
end

#create_partition_table(type = "msdos") ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 42

def create_partition_table(type = "msdos")
  Common.run!(Common.cmd(:parted), :params => {nil => parted_options_array("mklabel", type)})
end

#create_partitions(partition_type, *args) ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 84

def create_partitions(partition_type, *args)
  check_if_partitions_overlap(args)

  args.each { |arg|
    self.create_partition(partition_type, arg[:start], arg[:end])
  }
end

#has_partition_table? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/linux_admin/disk.rb', line 46

def has_partition_table?
  result = Common.run(Common.cmd(:parted), :params => {nil => parted_options_array("print")})

  result_indicates_partition_table?(result)
end

#partitions ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 35

def partitions
  @partitions ||=
    parted_output.collect { |disk|
      partition_from_parted(disk)
    }
end

#size ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 21

def size
  @size ||= begin
    size = nil
    out = Common.run!(Common.cmd(:fdisk), :params => {"-l" => nil}).output
    out.each_line do |l|
      /Disk #{path}: .*B, (\d+) bytes/.match(l) do |m|
        size = m[1].to_i
        break
      end
    end
    size
  end
end