[Bug 1694159] Re: Complete libvirt migration to Debian style packaging (dependencies, conffiles)

[ChristianEhrhardt]

After some cleanups things make more sense now.
For >=Yakkety upgraders we really only want to clean up and not mess with their setup.
So the design slightly changed to do so as intended.
Otherwise we might "bring back" old changes breaking a working system.
Instead the remove + message will help to
a) clean up
b) remind the user if he wants to re-setup anything

Also the tests are improved and have a new case now.

0. Calls
./conffiles-forgotten-test.sh TXUF
./conffiles-forgotten-test.sh TXF
./conffiles-forgotten-test.sh ZAF
./conffiles-forgotten-test.sh TXUF custom
./conffiles-forgotten-test.sh TXF custom
./conffiles-forgotten-test.sh TXUF newcustom

1. Upgrade paths:
 1.1 T->X->UCA-O-FixX (like full upgrade through Y,Z,A but faster)
 1.2 T->X->FixX (simulating LTS->LTS)
 1.3 Z->FixA (no old things around, shall not fail on upgrades on any of our code)

2. Default conffiles
 2.1 if all files are on default content only, they are deleted and not retained
 2.2 T-X-Fix e.g. default /etc/default/libvirt-bin not interferring with new /etc/default/libvirtd content
 2.3 T-X-UCA-Fix default /etc/default/libvirt-bin (duplicate) not interferring with new /etc/default/libvirtd content
 2.4 /etc/default/virtlockd and /etc/libvirt/libvirt-admin.conf shall still be around as they work and will come back via Debian
 2.5 remove default /etc/dnsmasq.d/libvirt-bin link

3. custom conffiles
 3.1 T-X-Fix custom data on TEMPLATE be removed, but retained in backup
 3.2 T-X-Fix custom data on /etc/cron.daily/libvirt-bin moved
 3.3 T-X-Fix custom data on /etc/default/libvirt-bin moved
 3.4 T-X-Fix custom data on /etc/init.d/libvirt-bin moved
 3.5 T-X-Fix Leave custom /etc/dnsmasq.d/libvirt-bin link untouched
 3.6 T-X-UCA-Fix custom data on TEMPLATE removed, but retained in backup
 3.7 T-X-UCA-Fix custom /etc/default/libvirt-bin (duplicate) removed, but retained in backup
 3.8 T-X-UCA-Fix custom data on /etc/cron.daily/libvirt-bin removed, but retained in backup
 3.9 T-X-UCA-Fix leave custom /etc/dnsmasq.d/libvirt-bin link untouched
 3.10 T-X-UCA-Fix custom /etc/init.d/libvirt-bin (want change) that was moved on ->yakkety, so it should just not be around
 
4. conflicting custom duplicate conffiles that "should have been" moved before
 4.1 T-X-UCA-Fix custom /etc/default/libvirt-bin removed, but retained in backup, not clashing new content
 4.2 T-X-UCA-Fix custom data on /etc/cron.daily/libvirt-bin removed, but retained in backup, not clashing new content
 4.3 T-X-UCA-Fix custom /etc/init.d/libvirt-bin that was moved on ->yakkety, new content in libvirtd should be unaffected

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https://bugs.launchpad.net/bugs/1694159

Title:
  Complete libvirt migration to Debian style packaging (dependencies,
  conffiles)

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