[Merge] lp:~mwhudson/livecd-rootfs/casper-be-gone into lp:livecd-rootfs

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging lp:~mwhudson/livecd-rootfs/casper-be-gone into lp:livecd-rootfs.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/casper-be-gone/+merge/335127

Currently casper ends up in the base filesystem (and so on the installed system) which isn't what we want. So we prevent that, by preventing lb_chroot_live-packages from running at all. Then of course, we need to install casper in the installer layer, and then regenerate the initramfs and make sure the later steps of the build pick it up (which is pretty ugly).

I haven't tested a CD built with this branch but I have run the livefs build https://launchpad.net/~mwhudson/+livefs/ubuntu/bionic/live-server-test/+build/118096 and checked that the generated initramfs is all but identical to the one generated by the default server-live livefs (only timestamps and randomly generated data differ).
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~mwhudson/livecd-rootfs/casper-be-gone into lp:livecd-rootfs.
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