Public bug reported:

[Impact]

For the use of ubuntu-image classic image generation, it is required
that livecd-rootfs supports a way to only generate the rootfs tree for a
selected set of arguments (project, architecture etc.). By design
ubuntu-image will use livecd-rootfs for preparation of the rootfs
contents and then continue with building the image. Since ubuntu-image
is backported feature-complete into artful, zesty and xenial, we would
need the same change to be propagated to those stable series.

[Test Case]

 * Install livecd-rootfs from -proposed
 * Create a temporary directory, cd into it
 * cp -a `dpkg -L livecd-rootfs | grep "auto$"` .
 * PROJECT="ubuntu-cpc" ARCH=amd64 IMAGEFORMAT=none lb config
 * PROJECT="ubuntu-cpc" ARCH=amd64 IMAGEFORMAT=none lb build
 * Make sure the build succeeds and that the current directory will have a 
chroot/ with the build rootfs contents

[Regression Potential]

The proposed change should be self-contained and not affecting any other
code paths, but in the case of a very unlikely situation regular image
builds could be broken by binary hooks not being executed.

** Affects: livecd-rootfs (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: livecd-rootfs (Ubuntu Xenial)
     Importance: High
     Assignee: Łukasz Zemczak (sil2100)
         Status: New

** Affects: livecd-rootfs (Ubuntu Zesty)
     Importance: High
     Assignee: Łukasz Zemczak (sil2100)
         Status: New

** Affects: livecd-rootfs (Ubuntu Artful)
     Importance: High
     Assignee: Łukasz Zemczak (sil2100)
         Status: New

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

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

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

** Changed in: livecd-rootfs (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: livecd-rootfs (Ubuntu Zesty)
   Importance: Undecided => High

** Changed in: livecd-rootfs (Ubuntu Artful)
   Importance: Undecided => High

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

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

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

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

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https://bugs.launchpad.net/bugs/1730642

Title:
  Support generating a rootfs tree only

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