[Bug 1751249] Re: Using “content:” in gadget.yaml for a “role: system-data” partition makes it not be system-data anymore

[Oliver Grawert]

$ find build/unpack/gadget/writable/
build/unpack/gadget/writable/
build/unpack/gadget/writable/meep.txt
build/unpack/gadget/writable/system-data
build/unpack/gadget/writable/system-data/etc
build/unpack/gadget/writable/system-data/etc/foo.txt

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https://bugs.launchpad.net/bugs/1751249

Title:
  Using “content:” in gadget.yaml for a “role: system-data” partition
  makes it not be system-data anymore

Status in ubuntu-image package in Ubuntu:
  New

Bug description:
  The core team thinks this is an ubuntu image bug, so i'm filing this
  here additionally to

  https://forum.snapcraft.io/t/using-content-for-a-role-system-data-
  partition-makes-it-not-be-system-data-anymore

  When i use a gadget.yaml entry like:

        - name: writable
          type: 83,0FC63DAF-8483-4772-8E79-3D69D8477DE4
          filesystem: ext4
          filesystem-label: writable
          size: 270M
          role: system-data
          content:
            - source: writable/
              target: /

  The partition is not pre-populated with snaps and seed but only the
  files defined in content are copied in.

  I would expect that the partition is still properly pre-populated with
  the usual writable/system-data content and that the content from the
  content: entry is additionally copied in place. Or at least that the
  role: system-data takes precedence here if this combination is not
  allowed (though snapcraft or ubuntu-image should then spill a warning
  at least) so that a bootable system exists.

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