[Bug 2081778] Re: storage probe validation fails for Windows dynamic disks "Couldn't find partition entry in table"

[Olivier Gayot]

** Changed in: subiquity (Ubuntu Noble)
    Milestone: None => ubuntu-24.04.3

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Title:
  storage probe validation fails for Windows dynamic disks "Couldn't
  find partition entry in table"

Status in curtin:
  Fix Committed
Status in subiquity:
  Fix Released
Status in subiquity package in Ubuntu:
  Fix Released
Status in subiquity source package in Noble:
  Confirmed

Bug description:
  Several users in private bugs have run into a common problem, where
  curtin fails to parse the initial storage configuration with the
  following error:

    File "/snap/ubuntu-desktop-installer/939/bin/subiquity/subiquity/server/controllers/filesystem.py", line 852, in _probe
      await asyncio.wait_for(self._probe_once_task.task, 90.0)
    File "/snap/ubuntu-desktop-installer/939/usr/lib/python3.10/asyncio/tasks.py", line 445, in wait_for
      return fut.result()
    File "/snap/ubuntu-desktop-installer/939/bin/subiquity/subiquitycore/context.py", line 148, in decorated_async
      return await meth(self, **kw)
    File "/snap/ubuntu-desktop-installer/939/bin/subiquity/subiquity/server/controllers/filesystem.py", line 834, in _probe_once
      self.model.load_probe_data(storage)
    File "/snap/ubuntu-desktop-installer/939/bin/subiquity/subiquity/models/filesystem.py", line 1548, in load_probe_data
      self.reset()
    File "/snap/ubuntu-desktop-installer/939/bin/subiquity/subiquity/models/filesystem.py", line 1131, in reset
      self._orig_config = storage_config.extract_storage_config(
    File "/snap/ubuntu-desktop-installer/939/lib/python3.10/site-packages/curtin/storage_config.py", line 1315, in extract_storage_config
      found_cfgs, found_errs = parser.parse()
    File "/snap/ubuntu-desktop-installer/939/lib/python3.10/site-packages/curtin/storage_config.py", line 634, in parse
      entry = self.asdict(data)
    File "/snap/ubuntu-desktop-installer/939/lib/python3.10/site-packages/curtin/storage_config.py", line 788, in asdict
      raise RuntimeError(
  RuntimeError: Couldn't find partition entry in table

  The issue can be reproduced with dry-run based on the ProbeData.txt in
  LP: #2017524 and presumably others.

  There are different root causes for the same error, but in this bug
  report, we focus on Windows dynamic disks.

  This is confirmed by the presence of a DOS partition table having only
  partitions with type 0x42.

  Example #1

              "partitiontable": {
                  "label": "dos",
                  "id": "0x13fa5c10",
                  "device": "/dev/sda",
                  "unit": "sectors",
                  "sectorsize": 512,
                  "partitions": [
                      {
                          "node": "/dev/sda1",
                          "start": 63,
                          "size": 1985,
                          "type": "42"
                      },
                      {
                          "node": "/dev/sda2",
                          "start": 2048,
                          "size": 1124352,
                          "type": "42",
                          "bootable": true
                      },
                      {
                          "node": "/dev/sda3",
                          "start": 1126400,
                          "size": 273600512,
                          "type": "42"
                      },
                      {
                          "node": "/dev/sda4",
                          "start": 274726912,
                          "size": 1678796208,
                          "type": "42"
                      }
                  ]
              }

  Example #2

              "partitiontable": {
                  "label": "dos",
                  "id": "0xfa0957a9",
                  "device": "/dev/sda",
                  "unit": "sectors",
                  "sectorsize": 512,
                  "partitions": [
                      {
                          "node": "/dev/sda1",
                          "start": 63,
                          "size": 976771057,
                          "type": "42"
                      }
                  ]
              }

  Workaround
  ----------
  * If the device configured as a Windows dynamic disk is not essential for the installation, you can unplug it before running the installer
  * One can format the device configured as a Windows dynamic disk (using basically any partitioning tools) or converted back to a basic disk on Windows. Note than the data on the device will be lost though!

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