[Bug 2052846] Re: Addressing disk via values in /dev/disk/by-id fails.

[Dan Bungert]

** Tags added: foundations-todo

** Project changed: curtin => curtin (Ubuntu)

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Title:
  Addressing disk via values in /dev/disk/by-id fails.

Status in curtin package in Ubuntu:
  Triaged

Bug description:
  Hello,

  Quoting the documentation [1]:

  ```
  serial: <serial number>

  In order to uniquely identify a disk on the system its serial number
  should be specified. This ensures that even if additional storage
  devices are added to the system during installation, or udev rules
  cause the path to a disk to change curtin will still be able to
  correctly identify the disk it should be operating on using
  /dev/disk/by-id.

  This is the preferred way to identify a disk and should be used in all production environments as it is less likely to point to an incorrect device.
  ```

  However, this approach did not work correctly when attempting to use
  either serial or path information from  `/dev/disk/by-id`. What did
  work was addressing the disk through its device designation (i.e.,
  /dev/sda). Then also, a serial number that did work appeared to be a
  part of the SCSI identification information. For example, if the SCSI
  identification information is:

  `scsi-nnn`

  Then a working "serial number" that could identify the disk in curtin
  would be: `nnn`. In addition, `wwn` identification numbers also did
  not work correctly to uniquely identify the disk. The full disk
  option:

  ```
  - {ptable: gpt, wipe: superblock-recursive, preserve: false, grub_device: false, layout: false, PATH OR SERIAL, type: disk, id: disk-vgdata}
  ```

  Curtin version being used is 22.1.

  Relevant cloud configuration:

  ```
  #cloud-config
  # this creates a bios partition, /boot partition, and root(/) lvm volume
  storage:
  config:
  - {ptable: gpt, wipe: superblock-recursive, preserve: false, grub_device: true, wwn: <Redacted>, type: disk, id: disk-sda}
  - {type: partition, wipe: superblock-recursive, preserve: false, number: 1, device: disk-sda, flag: bios_grub, size: 1M, id: bios-grub}
  - {type: partition, wipe: superblock, preserve: false, number: 2, device: disk-sda, flag: boot, size: 1G, id: sda-boot}
  - {type: partition, wipe: superblock, preserve: false, number: 3, device: disk-sda, size: -1 , id: sda-lvm}
  - {type: lvm_volgroup, name: vgsys, devices: [sda-lvm], id: vgsys}
  - {type: lvm_partition, volgroup: vgsys, id: lvroot, name: lvroot, size: 10G}
  - {type: lvm_partition, volgroup: vgsys, id: lvswap, name: lvswap, size: 1G}
  - {type: lvm_partition, volgroup: vgsys, id: lvhome, name: lvhome, size: 1G}
  - {type: lvm_partition, volgroup: vgsys, id: lvtmp, name: lvtmp, size: 4G}
  - {type: lvm_partition, volgroup: vgsys, id: lvopt, name: lvopt, size: 10G}
  - {type: lvm_partition, volgroup: vgsys, id: lvvar, name: lvvar, size: 10G}
  - {type: format, fstype: ext4, volume: sda-boot, id: sda-boot-fs}
  - {type: format, fstype: ext4, volume: lvroot, id: lv-root-fs}
  - {type: format, fstype: swap, volume: lvswap, id: lv-swap-fs}
  - {type: format, fstype: ext4, volume: lvhome, id: lv-home-fs}
  - {type: format, fstype: ext4, volume: lvtmp, id: lv-tmp-fs}
  - {type: format, fstype: ext4, volume: lvopt, id: lv-opt-fs}
  - {type: format, fstype: ext4, volume: lvvar, id: lv-var-fs}
  - {type: mount, path: /boot, id: m-boot, device: sda-boot-fs}
  - {type: mount, path: /, id: m-root, device: lv-root-fs}
  - {type: mount, path: '', id: m-swap, device: lv-swap-fs}
  - {type: mount, path: /home, id: m-home, device: lv-home-fs}
  - {type: mount, path: /tmp, id: m-tmp, device: lv-tmp-fs}
  - {type: mount, path: /opt, id: m-opt, device: lv-opt-fs}
  - {type: mount, path: /var, id: m-var, device: lv-var-fs}
  ```

  Installation was done using the pxe-booted live server ISO for Ubuntu
  22.04.3.

  [1] https://curtin.readthedocs.io/en/latest/topics/storage.html#disk-
  command

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