[Bug 1227252] [NEW] Upgrade from precise to precise SRU maas unconditionally disabled system DHCP

[James Troup]

Public bug reported:

We have a MAAS installation that was installed with original precise
MAAS (0.1+bzr482+dfsg-0ubuntu1) that was using the system (ISC) dhcpd.

When we upgraded it to the SRU MAAS
(1.2+bzr1373+dfsg-0ubuntu1~12.04.1), it unconditionally¹ disabled the
ISC dhcpd by shipping a '/etc/init/isc-dhcp-server.override' file.

The next time the isc-dhcp-server package was upgraded, our dhcpd
stopped and didn't start back up.

AFAIK (and the docs appear to confirm this), running MAAS with your
own DHCP server is a supported configuration, so it seems like the
upgrade process could be a little more flexible.

--

¹ At least, I can't see anything in the maintainer scripts or debconf
  stuff that would mean this file is ever not installed on upgrade.

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

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https://bugs.launchpad.net/bugs/1227252

Title:
  Upgrade from precise to precise SRU maas unconditionally disabled
  system DHCP

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