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

[Woodrow Shen]

Hi Iain,

The point for this patch is to identify if RAID/RST mode is enabled or
not. Based on this, ubiquity should consider any case in which the user
is able to install Ubuntu indeed. In your case, I think ubiquity can use
is_removable
(https://git.launchpad.net/ubiquity/tree/ubiquity/misc.py#n230) function
to check if external USB / USB-C drive is plugged or not, except for USB
boot device.

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Title:
  Add Intel RAID/RST detection with NVMe devices

Status in hw-detect package in Ubuntu:
  New

Bug description:
  [Impact]

  The disk-detect.sh supports to detect if Intel RAID/RST mode is
  activated as NVMe devices are remapped to PCI bus. 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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