[Bug 2046669] [NEW] BTRFS Incorrect Sector Size

[Mark Lopez]

Public bug reported:

When attempting to use curtin to install Ubuntu with a BTRFS + luks
root, curtin uses an invalid sector size, causing mkfs.btrfs to exit
with error 1. It appears that mkfs.btrfs is expecting either a value of
4k or 64k, but curtin generates a sector size of 2048 (from
blockdev_sector_size it appears).

In the Ubuntu installer, specifying extra_options directly, works around
this issue. For example:

      - id: boot-format
        type: format
        fstype: btrfs
        volume: boot-partition
        extra_options:
          - --sectorsize
          - 4k

This workaround was lucky, since the cli ignore previous options in
favor of later options in the command.

What's odd is that I was was able to successful install using this
configuration onto another server a year ago, without needing a
workaround - so I suspect a regression somewhere, somewhat recently.

** Affects: curtin
     Importance: Undecided
         Status: New

** Description changed:

  When attempting to use curtin to install Ubuntu with a BTRFS + luks
  root, curtin uses an invalid sector size, causing mkfs.btrfs to exit
  with error 1. It appears that mkfs.btrfs is expecting either a value of
  4k or 64k, but curtin generates a sector size of 2048 (from
  blockdev_sector_size it appears).
  
- In the Ubuntu installer, specifying extra_options directly, worksaround
+ In the Ubuntu installer, specifying extra_options directly, works around
  this issue. For example:
  
-       - id: boot-format
-         type: format
-         fstype: btrfs
-         volume: boot-partition
-         extra_options:
-           - --sectorsize
-           - 4k
+       - id: boot-format
+         type: format
+         fstype: btrfs
+         volume: boot-partition
+         extra_options:
+           - --sectorsize
+           - 4k
  
  This workaround was lucky, since the cli ignore previous options in
  favor of later options in the command.
  
  What's odd is that I was was able to successful install using this
  configuration onto another server a year ago, without needing a
  workaround - so I suspect a regression somewhere, somewhat recently.

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https://bugs.launchpad.net/bugs/2046669

Title:
  BTRFS Incorrect Sector Size

Status in curtin:
  New

Bug description:
  When attempting to use curtin to install Ubuntu with a BTRFS + luks
  root, curtin uses an invalid sector size, causing mkfs.btrfs to exit
  with error 1. It appears that mkfs.btrfs is expecting either a value
  of 4k or 64k, but curtin generates a sector size of 2048 (from
  blockdev_sector_size it appears).

  In the Ubuntu installer, specifying extra_options directly, works
  around this issue. For example:

        - id: boot-format
          type: format
          fstype: btrfs
          volume: boot-partition
          extra_options:
            - --sectorsize
            - 4k

  This workaround was lucky, since the cli ignore previous options in
  favor of later options in the command.

  What's odd is that I was was able to successful install using this
  configuration onto another server a year ago, without needing a
  workaround - so I suspect a regression somewhere, somewhat recently.

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