Class: LinuxAdmin::Disk

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

Constant Summary

Constants inherited from LinuxAdmin

VERSION

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Common

#cmd, #run

Constructor Details

#initialize(args = {}) ⇒ Disk

Returns a new instance of Disk.



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# File 'lib/linux_admin/disk.rb', line 18

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 10

def path
  @path
end

Class Method Details

.local ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 12

def self.local
  Dir.glob('/dev/[vhs]d[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 115

def clear!
  @partitions = []

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

  self
end

#create_partition(partition_type, size) ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 95

def create_partition(partition_type, size)
  id, start =
    partitions.empty? ? [1, 0] :
      [(partitions.last.id + 1),
        partitions.last.end_sector]

  run(cmd(:parted),
      :params => { nil => [path, 'mkpart', partition_type,
                           start, start + size]})

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

#partitions ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 45

def partitions
  @partitions ||= begin
    partitions = []

    # requires sudo
    out = run(cmd(:parted),
              :return_exitstatus => true,
              :return_output => true,
              :params => { nil => [@path, 'print'] })

    return [] if out.kind_of?(Fixnum)

    out.each_line do |l|
      if l =~ /^ [0-9].*/
        p = l.split
        args = {:disk => self}
        fields = [:id, :start_sector, :end_sector,
                  :size, :partition_type, :fs_type]

        fields.each_index do |i|
          val = p[i]
          case fields[i]
          when :start_sector, :end_sector, :size
            if val =~ /([0-9\.]*)([KMG])B/
              val = case $2
                    when 'K' then
                      $1.to_f.kilobytes
                    when 'M' then
                      $1.to_f.megabytes
                    when 'G' then
                      $1.to_f.gigabytes
                    end
            end

          when :id
            val = val.to_i

          end

          args[fields[i]] = val
        end
        partitions << Partition.new(args)

      end
    end

    partitions
  end
end

#size ⇒ Object 



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# File 'lib/linux_admin/disk.rb', line 22

def size
  @size ||= begin
    size = nil
    out = run(cmd(:fdisk),
              :return_output => true,
              :params => {"-l" => nil})
    out.each_line { |l|
      if l =~ /Disk #{path}: ([0-9\.]*) ([KMG])B.*/
        size = case $2
               when 'K' then
                 $1.to_f.kilobytes
               when 'M' then
                 $1.to_f.megabytes
               when 'G' then
                 $1.to_f.gigabytes
               end
        break
      end
    }
    size
  end
end