[Bug 1874834] Re: Xenial builds with core18-based snaps pre-seed core snap instead

[Robert C Jennings]

** Description changed:

- A xenial image that preseeds a snap based on core18 will end up with
- core instead and preseeding on boot will fail.
+ [Impact]
+ 
+  * A xenial image that preseeds a snap based on core18 will
+    end up with core instead and preseeding on boot will fail.
+ 
+ 
+ [Test Case]
+ 
+  * Add a binary hook that pre-seeds lxd (which recently moved to a
+    core18 base).  Ensure the snapd and core18 are pulled in by the
+    build and core is not present.  Boot the image and ensure
+    pre-seeding is successful.
+ 
+ [Regression Potential]
+ 
+  * Images with pre-seeded snaps regress in some fashion.  We will need
+    to check these builds but there are no pre-seeded snaps in the
+    livecd-rootfs tree for Xenial so this is a low risk change.

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https://bugs.launchpad.net/bugs/1874834

Title:
  Xenial builds with core18-based snaps pre-seed core snap instead

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

   * A xenial image that preseeds a snap based on core18 will
     end up with core instead and preseeding on boot will fail.

  
  [Test Case]

   * Add a binary hook that pre-seeds lxd (which recently moved to a
     core18 base).  Ensure the snapd and core18 are pulled in by the
     build and core is not present.  Boot the image and ensure
     pre-seeding is successful.

  [Regression Potential]

   * Images with pre-seeded snaps regress in some fashion.  We will need
     to check these builds but there are no pre-seeded snaps in the
     livecd-rootfs tree for Xenial so this is a low risk change.

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