[Bug 2083322] Re: Partial reformat partially works

[Olivier Gayot]

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

** Also affects: subiquity (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: subiquity (Ubuntu Noble)
       Status: New => In Progress

** Changed in: subiquity (Ubuntu Noble)
     Assignee: (unassigned) => Olivier Gayot (ogayot)

** Changed in: subiquity (Ubuntu)
       Status: New => Fix Released

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Title:
  Partial reformat partially works

Status in subiquity:
  Fix Released
Status in subiquity package in Ubuntu:
  Fix Released
Status in subiquity source package in Noble:
  In Progress

Bug description:
  I was investigating a bug report involving a guided reformat in a disk
  that had a partition "in-use" (i.e., mounted). In such a scenario, the
  installer tries to delete the partitions that are *not* in-use.

  Unfortunately, this does not work as it should. We iterate over the
  partitions and remove them at the same time. This is basic iterator
  invalidation.

  In the example below (I added extra debugging information), the disk
  has 4 partitions and partition number 2 appears in-use. We should get
  partition number 1, 3 and 4 removed.

  DEBUG disk.partitions() = [
      Partition(device=disk-sda, ..., number=1, ...),
      Partition(device=disk-sda, ..., number=2, ...),
      Partition(device=disk-sda, ..., number=3, ...),
      Partition(device=disk-sda, ..., number=4, ...)
  ]
  DEBUG in_use_parts = [
      Partition(device=disk-sda, ..., number=2, ...)
  ]

  DEBUG iterating over disk.partitions()
  DEBUG   current element: Partition(device=disk-sda, ..., number=1, ...)
  DEBUG     partition is not in use, calling delete_partition(Partition(device=disk-sda, ..., number=1, ...))
  DEBUG   current element: Partition(device=disk-sda, ..., number=3, ...)
  DEBUG     partition is not in use, calling delete_partition(Partition(device=disk-sda, ..., number=3, ...))

  ^ We didn't iterate over either sda2 or sda4.

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