class VagrantPlugins::ProviderLibvirt::Util::DiskDeviceResolver

Attributes

existing[R]

Public Class Methods

new(prefix='vd') click to toggle source
# File lib/vagrant-libvirt/util/resolvers.rb, line 12
def initialize(prefix='vd')
  @default_prefix = prefix

  @device_indicies = Hash.new
  @existing = Hash.new
end

Public Instance Methods

resolve(disks) click to toggle source
# File lib/vagrant-libvirt/util/resolvers.rb, line 46
def resolve(disks)
  new_disks = []
  disks.each do |disk|
    new_disks.push disk.dup
  end

  resolve!(new_disks)

  new_disks
end
resolve!(disks, options={}) click to toggle source
# File lib/vagrant-libvirt/util/resolvers.rb, line 19
def resolve!(disks, options={})
  # check for duplicate device entries and raise an exception if one found
  # with enough details that the user should be able to determine what
  # to do to resolve.
  disks.select { |x| !x[:device].nil? }.each do |x|
    if @existing.has_key?(x[:device])
      raise Errors::DuplicateDiskDevice, new_disk: x, existing_disk: @existing[x[:device]]
    end

    @existing[x[:device]] = x
  end

  disks.each_index do |index|
    dev = disks[index][:device]
    if dev.nil?
      prefix = options.fetch(:prefix, @default_prefix)
      dev = next_device(prefix=prefix)
      if dev.nil?
        raise Errors::NoDiskDeviceAvailable, prefix: prefix
      end

      disks[index][:device] = dev
      @existing[dev] = disks[index]
    end
  end
end

Private Instance Methods

device_index(prefix) click to toggle source
# File lib/vagrant-libvirt/util/resolvers.rb, line 73
def device_index(prefix)
  @device_indicies[prefix] ||= 'a'.ord
end
next_device(prefix) click to toggle source
# File lib/vagrant-libvirt/util/resolvers.rb, line 59
def next_device(prefix)
  curr = device_index(prefix)
  while curr <= 'z'.ord
    dev = prefix + curr.chr
    if !@existing[dev].nil?
      curr += 1
      next
    else
      @device_indicies[prefix] = curr
      return dev
    end
  end
end