[Bug 1196388] [NEW] cobbler-ubuntu-import does not import LTS enablement stack images

[Emil Sit]

Public bug reported:

https://wiki.ubuntu.com/Kernel/LTSEnablementStack describes that new
Ubuntu installs for 12.04.2 etc default to using the enablement stacks
containing newer kernels and hardware support from Quantal (and Raring).

The netboot images for these are located in a sub-directory such as
quantal-netboot (instead of just netboot). For example,
http://archive.ubuntu.com/ubuntu/dists/precise-updates/main/installer-
amd64/current/images/quantal-netboot/. Presumably when 12.04.3 is
released, it should use raring-netboot.

I'm not sure whether the script should default to using the latest LTS
Enablement Stack (arguably yes); if so then the update_available check
should probably be switched to check for the latest LTS netboot image.
Or perhaps a symlink should be created (like lts-netboot) so that this
script doesn't need to be updated for every point release.

Attached is a patch that makes it an unconfigurable default.

If it seems better not to have it default to the new stacks, it should
probably be an option for those who want it.

** Affects: cobbler (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "Hack to enable LTS checking"
   https://bugs.launchpad.net/bugs/1196388/+attachment/3719926/+files/cobbler-ubuntu-import.patch

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https://bugs.launchpad.net/bugs/1196388

Title:
  cobbler-ubuntu-import does not import LTS enablement stack  images

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