[Bug 1864965] Re: Add Intel RAID/RST detection with NVMe devices

[Woodrow Shen]

I'm trying to extract the function as a new script due to the possible
case: (please rectify if I'm wrong):

disk-detect.sh seems not to be used in the ubiquity (but disk-detect.sh
will be called in the post-installation)

I think the possible call sequence will be like: ubi-partman ->
discover-remapped-nvme.sh -> ubi-partman gets the value via db.get
('disk-detect/activate_remapped_nvme') -> respond to dialog.

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Title:
  Add Intel RAID/RST detection with NVMe devices

Status in hw-detect package in Ubuntu:
  In Progress

Bug description:
  [Impact]

  A new discover-remapped-nvme.sh supports to detect if Intel RAID/RST
  mode is activated as NVMe devices are remapped to AHCI memory space.
  Based on this, ubiquity installer can take advantage of detection and
  handle such a case with improved user experience.

  [Test Case]

  There are several ways to test this case, but one of them will be
  integration test:

  In ubiquity, hw-detect will be sourced, and then import disk-detect.sh to call remapped_nvme_probe(). Then use the following command to get debconf value:
  $ echo "get disk-detect/activate_remapped_nvme" | sudo debconf-communicate
  0 True

  [Regression Potential]

  Some case will be different, especially the system doesn't have AHCI
  when RAID mode was set in BIOS, so that PCI attribute "remapped_nvme"
  is gone.

  [Other Info]

  To upstream to debian sid is another WIP item.

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