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

[Steve Langasek]

On Thu, Mar 15, 2018 at 05:15:37PM -0000, Oliver Grawert wrote:
> nontheless, we need the "content:" directive on a "role: system-data"
> partition working for a customer project soon where some udev rules (and
> other files) need to be pre-installed in the system-data partition.

I agree that this is a useful feature to have, and this has come up before. 
However, it doesn't follow from the spec (which is admittedly ambiguous),
and it's new feature work.  If this is a requirement for a customer project
"soon", you might need to look at contributing that feature.

In any case, if there is a deadline for this please communicate this to us
so we can try to schedule it appropriately.

> While I could apply hacks to do this from i.e. a customized hacked
> initrd I would really prefer if we could give something clean to the
> customer for their production images instead.

For a possibly-reusable example of this from the joule images, see:

  git+ssh://git.launchpad.net/~vorlon/tuchuck/+git/uc16-build-script

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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:
  New
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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