[Bug 1879350] Re: need uc20 grade=dangerous channel=beta images built

[Łukasz Zemczak]

Ok, so actually this is much easier. After talking with mvo it seems
that grade dangerous models can have their channels freely overridden,
which means no new model assertions need to be created. What I did is I
prepared an upload for livecd-rootfs which adds the support for
dangerous-<CHANNEL> channel. Once such a channel is given, we will use
the dangerous model (which defaults to edge) and then override it with
the channel name that's supplied after the -. I did a test build with
this change and it seemed to work:

https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/focal/ubuntu-
core/+build/218342

Pushed it to the ubuntu/focal branch and uploaded to snappy-dev/image. I
also switched cdimage to build the new images.

** Also affects: livecd-rootfs (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Focal)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: livecd-rootfs (Ubuntu Focal)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1879350

Title:
  need uc20 grade=dangerous channel=beta images built

Status in Ubuntu CD Images:
  New
Status in livecd-rootfs package in Ubuntu:
  In Progress
Status in livecd-rootfs source package in Focal:
  Fix Committed

Bug description:
  We need the following things:

  1. canonical signed model assertions for a uc20 image with grade==dangerous, channel==beta for the various supported platforms, i.e. right now generic pc-kernel amd64 and armhf pi-kernel and arm64 pi-kernel models
  2. livcd-rootfs + cdimage builds of images for the above model assertions
  3. somehow these builds get published onto http://cdimage.ubuntu.com/ubuntu-core/20/dangerous-beta/ (or some other new directory there that does not conflict with the current set of dangerous, edge and beta)

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