Class: Bootloader::UdevMapping

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Singleton, Yast::Logger
Defined in:
src/lib/bootloader/udev_mapping.rb

Overview

Class manages mapping between udev names of disks and partitions.

Constant Summary

Instance Method Summary (collapse)

Instance Method Details

- (Object) to_hash

Returns hash where keys are udev links for disks and partitions and value their kernel devices. TODO: remove when remove pbl support

Examples:

of output

{
  "/dev/disk/by-id/abcd" => "/dev/sda",
  "/dev/disk/by-id/abcde" => "/dev/sda",
  "/dev/disk/by-label/label1" => "/dev/sda1",
  "/dev/disk/by-uuid/aaaa-bbbb-cccc-dddd" => "/dev/sda",
}


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# File 'src/lib/bootloader/udev_mapping.rb', line 33

def to_hash
  all_devices
end

- (Object) to_kernel_device(dev)

Converts full udev name to kernel device ( disk or partition )

Parameters:

  • dev (String) —

    device udev, mdadm or kernel name like /dev/disk/by-id/blabla

Raises:

  • when device have udev format but do not exists



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# File 'src/lib/bootloader/udev_mapping.rb', line 40

def to_kernel_device(dev)
  log.info "call to_kernel_device for #{dev}"
  raise "invalid device nil" unless dev

  # for non-udev devices try to see specific raid names (bnc#944041)
  if dev =~ /^\/dev\/disk\/by-/
    all_devices[dev] or raise "Unknown udev device #{dev}"
  else
    param = Yast::ArgRef.new({})
    result = Yast::Storage.GetContVolInfo(dev, param)
    return dev unless result # not raid with funny name

    info = param.value
    return info["vdevice"] unless info["vdevice"].empty?
    return info["cdevice"] unless info["cdevice"].empty?

    raise "unknown value for raid device '#{info.inspect}'"
  end
end

- (Object) to_mountby_device(dev)

Converts udev or kernel device (disk or partition) to udev name according to mountby option or kernel device if such udev device do not exists

Parameters:

  • dev (String) —

    device udev or kernel one like /dev/disk/by-id/blabla

Raises:

  • when device have udev format but do not exists



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# File 'src/lib/bootloader/udev_mapping.rb', line 64

def to_mountby_device(dev)
  kernel_dev = to_kernel_device(dev)

  log.info "#{dev} looked as kernel device name: #{kernel_dev}"

  storage_data = storage_data_for(kernel_dev)
  return kernel_dev unless storage_data

  mount_by = used_mount_by(storage_data)
  # explicit request to mount by kernel device
  return kernel_dev if mount_by == :device

  udev_data_key = MOUNT_BY_MAPPING_TO_UDEV[mount_by]
  raise "Internal error unknown mountby #{mount_by}" unless udev_data_key
  udev_pair = map_device_to_udev_devices(
    storage_data[udev_data_key],
    udev_data_key,
    kernel_dev
  ).first
  if !udev_pair
    log.warn "Cannot find udev link to satisfy mount by for #{kernel_dev}"
    return kernel_dev
  end

  # udev pair contain as first udev device and as second coresponding kernel device
  udev_pair.first
end