Class: QemuToolkit::ISCSITarget

Inherits:
Object
  • Object
show all
Defined in:
lib/qemu-toolkit/iscsi_target.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(iqn, address, backend) ⇒ ISCSITarget

Returns a new instance of ISCSITarget.



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# File 'lib/qemu-toolkit/iscsi_target.rb', line 3

def initialize(iqn, address, backend)
  @iqn, @address = iqn, address
  @backend = backend
  
  # Keep track if disks has ever returned an array of size > 0. This would
  # mean that the target is connected and will stay connected until we 
  # change that. 
  @mapped = false
end

Instance Attribute Details

#address ⇒ Object (readonly)

Returns the value of attribute address.



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# File 'lib/qemu-toolkit/iscsi_target.rb', line 14

def address
  @address
end

#iqn ⇒ Object (readonly)

Returns the value of attribute iqn.



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# File 'lib/qemu-toolkit/iscsi_target.rb', line 13

def iqn
  @iqn
end

Instance Method Details

#disks ⇒ Object 



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# File 'lib/qemu-toolkit/iscsi_target.rb', line 45

def disks
  luns = []
  
  state = 0
  last_lun = nil
        
  target_list.each_line do |line|
    case state
      when 0
        state += 1 if line.match(/^Target: #{Regexp.escape(iqn)}\n/m)
        lun = nil
      when 1
        if md=line.match(/^\s+LUN: (\d+)\n/m)
          last_lun = md[1] 
        end
        
        if last_lun && md=line.match(/^\s+OS Device Name: (\/dev\/rdsk\/.*)\n/m)
          luns << [Integer(last_lun), md[1]]
        end
        
        state += 1 if line.match(/^Target: /)
    end
  end
  
  luns.sort_by { |no,_| no }.map { |_, dev| p0ify(dev) }
end

#ensure_exists ⇒ Object 



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# File 'lib/qemu-toolkit/iscsi_target.rb', line 20

def ensure_exists
  # If the target is mapped already, nothing to do. 
  return if mapped?

  # Map the target
  begin
    @backend.iscsiadm :add, 'static-config', "#{iqn},#{address}", '2>/dev/null'
  rescue 
    # Ignore already mapped targets
  end
  
  print "Waiting for iSCSI disks to come online..."
  while !mapped?
    print '.'
    sleep 0.5 # takes a short while until login
  end
  puts 'OK.'
end

#mapped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/qemu-toolkit/iscsi_target.rb', line 16

def mapped?
  disks.size > 0
end

#target_list ⇒ Object

A cached ‘list target -vS’



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# File 'lib/qemu-toolkit/iscsi_target.rb', line 41

def target_list
  @backend.iscsiadm :list, :target, '-vS'
end