[Bug 1585233] Re: Provide -root.tar.xz for bionic and later

[Dan Watkins]

That change hasn't yet landed in the cosmic archive, so isn't yet
suitable for SRU to bionic.

This new hook will get updated along with all the other tarball
generation when the xattrs change is backported.

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Title:
  Provide -root.tar.xz for bionic and later

Status in cloud-images:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Fix Released

Bug description:
  Hi,
  compared to xenial [1], yakkety [2] is missing a -root.tar.xz file.
  The .tar.xz file is quite valuable compared to a -squashfs image for at least the following reasons:

  a.) it is much less common denominator (mac or windows can open it)
  b.) it is much smaller (138M compared to 171M for most recent xenial image)
  c.) it can be "streamed", where the squashfs image must be downloaded in complete before it can be viewed.  This is a significant optimization for for a system that can download and check while extracting.

  [1] http://cloud-images.ubuntu.com/daily/server/xenial/current/
  [2] http://cloud-images.ubuntu.com/daily/server/yakkety/current/

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