[Bug 1930103] Re: isc-dhcp-server overwrites /etc/default/isc-dhcp-server during update

[Seth Arnold]

Hello Milan, I just tested an upgrade:

Unpacking isc-dhcp-server (4.4.1-2.1ubuntu5.20.04.2) over
(4.4.1-2.1ubuntu5) ...

and my /etc/default/isc-dhcp-server modifications had been left in
place.

The maintainer scripts will create a new one if the file cannot be read:
https://sources.debian.org/src/isc-dhcp/4.4.1-2.2/debian/isc-dhcp-server.postinst/#L33

(Debian sources, but Ubuntu's are very similar.)

Is it possible your old /etc/default/isc-dhcp-server could not be read?

Thanks

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https://bugs.launchpad.net/bugs/1930103

Title:
  isc-dhcp-server overwrites /etc/default/isc-dhcp-server during update

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  Today unattended upgrade of ISC DHCPD overwrite config file
  /etc/default/isc-dhcp-server and set wrong interface where daemon have
  to listen (eno2 instead of br0 as was set before update).

  I see no backup file of original config file so I had to investigate
  where the problem was.

  Update have to never overwrite config file and throw away previous
  version.

  /var/log/apt/history.log:
  Start-Date: 2021-05-28  06:17:41
  Commandline: /usr/bin/unattended-upgrade
  Upgrade: isc-dhcp-server:amd64 (4.4.1-2.1ubuntu5, 4.4.1-2.1ubuntu5.20.04.2)
  End-Date: 2021-05-28  06:17:47

  root at linux:~# ls -l /etc/default/isc-dhcp-server
  -rw-r--r-- 1 root root 629 May 28 06:17 /etc/default/isc-dhcp-server

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