This is the development version of Kanrisuru. Since this is still a pre-1.0 release, we don't recommend using this in system-critical production environments.

Kanrisuru

blkid

Get attirbutes of block devices on a system in ruby.
linux manual

Basic Usage

require 'kanrisuru'
host = Kanrisuru::Remote::Host.new(host: '127.0.1.1', username: 'ubuntu', keys: ['~/.ssh/id_rsa'])

host.su('root')
result = host.blkid(device: '/dev/vda1')
result.success?
true

result.name
"/dev/vda1"

result.type
"ext4"

This command needs escalated privlidges to access certain attributes of a device.

Parameters

Field Type Description
label string
 		Search a device drive by label
uuid string
 		Search a device drive by uuid
device string
 		Search a device drive by name

Result

Returns an array of BlkidDevice structs if parameters are blank, or device field is present. If label or uuid is presented as a search parameter, the name of the device will be the only item returned.

BlkidDevice Fields

Field Type Description
name string The name of the block device
label string A descriptive identifier used for easy querying of the device block.
uuid string Unique identifier assigned to the filesystem
type string Filesystem formatted partition type (ext4, xfs, fat, etc)
uuid_sub string Unique identifier assigned to a brfts volume
label_fatboot string A label given to a fat formatted partiton device.
version double The filesystem version
usage string How is the device block being used, eg "filesystem", "raid", etc.
part_uuid string Unique identifier for GPT partitioned disks
part_entry_scheme string Partition table type
part_entry_uuid string Unique identifier for the partition entry
part_entry_type string Partition type, 0xNN (e.g 0x82) or type UUID (gpt only) or type string (mac)
part_entry_number string Partition number
part_entry_offset string The beginning of the offset
part_entry_size string The size of the partition
part_entry_disk string The whole disk, maj:min
minimum_io_size string Minimum size which is the device's preferred unit of I/O. For RAID arrays it is often the stripe chunk size.
physical_sector_size string The smallest unit a physical storage device can write atomically. It is usually the same as the logical sector size but may be bigger.
logical_sector_size string The smallest unit the storage device can address. It is typically 512 bytes

Return Example

host.blkid(device: '/dev/vda1')[0]
#<Struct:Kanrisuru::Core::Disk::BlkidDevice:0x000005a0
  label = "cloudimg-rootfs",
  label_fatboot = nil,
  logical_sector_size = 512,
  minimum_io_size = 512,
  name = "/dev/vda1",
  part_entry_disk = "252:0",
  part_entry_number = 1,
  part_entry_offset = 227328,
  part_entry_scheme = "gpt",
  part_entry_size = 16549855,
  part_entry_type = "0fc63daf-8483-4772-8e79-3d69d8477de4",
  part_entry_uuid = "6cbfe876-34eb-487b-8389-7d7cb327ddd9",
  part_uuid = nil,
  physical_sector_size = 512,
  type = "ext4",
  usage = "filesystem",
  uuid = "b8976b0d-6f88-49b9-8e4a-787323d98d2c",
  uuid_sub = nil,
  version = 1.0
>

Exit Status

Code Description
0 Success
2 If the specified token was not found, or no (specified) devices could be identified
4 Usage or other errors

Additional Examples

host.blkid(uuid: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx').to_s
"/dev/vda1"

host.blkid(label: 'cloudimg-rootfs').to_s
"/dev/vda1"

Tested On

  • Ubuntu, Debian, Centos, Fedora, Redhat, OpenSuse, SLES
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