[Bug 1005547] [NEW] on upgrade lucid -> precise /etc/default/isc-dhcp-relay is not migrated

[Stéphane Graber]

Public bug reported:

Very similar to bug 1003971.

/etc/default/dhcp3-relay became /etc/default/isc-dhcp-relay with the 4.x release of isc.
This file is generated by the maintainer script using debconf keys, so we can't apply the same trick as dhcp3-server.

The implemented solution is to:
1) Change dhcp3-server.config in Precise to source /etc/default/dhcp3-relay if present and load the values into debconf
2) Have the postinst generate /etc/default/isc-dhcp-relay from debconf (showing the previous values to the user)
3) Have the dhcp3-relay postinst remove any remaining /etc/default/dhcp3-relay

Testcase:
1) Install dhcp3-relay on Ubuntu 10.04
2) Use 1.2.3.4 as the server address and eth0 as the interface
3) (ugly trick) manually update /etc/apt/sources.list to point to precise and include precise-proposed
4) sudo apt-get update
5) sudo apt-get install dhcp3-relay (a full dist-upgrade won't work, but selective upgrade of just dhcp3-server will work)
6) Confirm that debconf is preseeded with the values from the old dhcp3-relay installation and that the resulting generated file in /etc/default/isc-dhcp-relay matches the one from dhcp3-relay. Also ensure that there's no more /etc/default/dhcp3* entries.

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: isc-dhcp (Ubuntu Precise)
     Importance: Medium
     Assignee: Stéphane Graber (stgraber)
         Status: In Progress

** Affects: isc-dhcp (Ubuntu Quantal)
     Importance: Undecided
         Status: Invalid

** Also affects: isc-dhcp (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Changed in: isc-dhcp (Ubuntu Precise)
   Importance: Undecided => Medium

** Changed in: isc-dhcp (Ubuntu Precise)
       Status: New => Triaged

** Changed in: isc-dhcp (Ubuntu Precise)
       Status: Triaged => In Progress

** Changed in: isc-dhcp (Ubuntu Precise)
     Assignee: (unassigned) => Stéphane Graber (stgraber)

** Also affects: isc-dhcp (Ubuntu Quantal)
   Importance: Undecided
       Status: New

** Changed in: isc-dhcp (Ubuntu Quantal)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1005547

Title:
  on upgrade lucid -> precise /etc/default/isc-dhcp-relay is not
  migrated

Status in “isc-dhcp” package in Ubuntu:
  Invalid
Status in “isc-dhcp” source package in Precise:
  In Progress
Status in “isc-dhcp” source package in Quantal:
  Invalid

Bug description:
  Very similar to bug 1003971.

  /etc/default/dhcp3-relay became /etc/default/isc-dhcp-relay with the 4.x release of isc.
  This file is generated by the maintainer script using debconf keys, so we can't apply the same trick as dhcp3-server.

  The implemented solution is to:
  1) Change dhcp3-server.config in Precise to source /etc/default/dhcp3-relay if present and load the values into debconf
  2) Have the postinst generate /etc/default/isc-dhcp-relay from debconf (showing the previous values to the user)
  3) Have the dhcp3-relay postinst remove any remaining /etc/default/dhcp3-relay

  Testcase:
  1) Install dhcp3-relay on Ubuntu 10.04
  2) Use 1.2.3.4 as the server address and eth0 as the interface
  3) (ugly trick) manually update /etc/apt/sources.list to point to precise and include precise-proposed
  4) sudo apt-get update
  5) sudo apt-get install dhcp3-relay (a full dist-upgrade won't work, but selective upgrade of just dhcp3-server will work)
  6) Confirm that debconf is preseeded with the values from the old dhcp3-relay installation and that the resulting generated file in /etc/default/isc-dhcp-relay matches the one from dhcp3-relay. Also ensure that there's no more /etc/default/dhcp3* entries.

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