[Bug 1826252] [NEW] by-id/wwn symlinks for virtio-scsi and multipath-tools not present

[Ryan Harper]

Public bug reported:

In vmtest, we use virtio-scsi controller with scsi-hd devices.  When we
supply them with a wwn property, 60-persistent-storage.rules will create
a /dev/disk/by-id/wwn-<wwn value> to point to the disk with said
property.

In disco, we now include multipath-tools which brings in sg3-utils-udev
which provides a 55-scsi-sg3_id.rules file which runs before 60
-persistent-storage.rules.

In the sg3 rules, it uses sg_inq to extract values from the device.

The result is that a virtio-scsi/scsi-hd device does not expose ID_WWN
in the same way, and if no serial value is set on the device, sg3 rules
will *create* and ID_SERIAL value from the device model and other
attributes.

This _prevents_ 60-persisten-storage.rules from running scsi_id which
*does* find the the ID_WWN property on the scsi-hd.

** Affects: curtin
     Importance: Undecided
         Status: New

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: sg3-utils (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: sg3-utils (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: udev (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1826252

Title:
  by-id/wwn symlinks for virtio-scsi and multipath-tools not present

Status in curtin:
  New
Status in qemu package in Ubuntu:
  New
Status in sg3-utils package in Ubuntu:
  New
Status in udev package in Ubuntu:
  New

Bug description:
  In vmtest, we use virtio-scsi controller with scsi-hd devices.  When
  we supply them with a wwn property, 60-persistent-storage.rules will
  create a /dev/disk/by-id/wwn-<wwn value> to point to the disk with
  said property.

  In disco, we now include multipath-tools which brings in sg3-utils-
  udev which provides a 55-scsi-sg3_id.rules file which runs before 60
  -persistent-storage.rules.

  In the sg3 rules, it uses sg_inq to extract values from the device.

  The result is that a virtio-scsi/scsi-hd device does not expose ID_WWN
  in the same way, and if no serial value is set on the device, sg3
  rules will *create* and ID_SERIAL value from the device model and
  other attributes.

  This _prevents_ 60-persisten-storage.rules from running scsi_id which
  *does* find the the ID_WWN property on the scsi-hd.

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