[Bug 1862305] Re: distro-info in xenial backports needs a newer distro-info-data and versioned dependency

[Christian Ehrhardt ]

xenial-updates:
ii  distro-info                      0.14ubuntu0.2
ii  distro-info-data                 0.28ubuntu0.18

root at x-bpotest:~# distro-info --supported-esm
xenial
bionic
focal
root at x-bpotest:~# distro-info --lts
focal

Going to the bad version in backports

$ apt install distro-info/xenial-backports


As expected it doesn't know about --supported-esm

# distro-info --supported-esm
ubuntu-distro-info: unrecognized option `--supported-esm'

But even --lts fails due to the data format change.

Update to the build from xenial-unapproved
=> https://launchpadlibrarian.net/689166277/distro-info_0.18ubuntu0.18.04.1~bpo18.04.1_source.changes
Build in sbuild against xenial-backports fine, just the expected non fatal Lintian warnings.

# apt install ./distro-info_0.18ubuntu0.18.04.1~bpo18.04.1_amd64.deb
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'distro-info' instead of './distro-info_0.18ubuntu0.18.04.1~bpo18.04.1_amd64.deb'
The following packages were automatically installed and are no longer required:
  gettext-base libasprintf0v5 libfreetype6 libpng12-0
Use 'apt autoremove' to remove them.
Suggested packages:
  shunit2
The following packages will be upgraded:
  distro-info
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/20.3 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 /root/distro-info_0.18ubuntu0.18.04.1~bpo18.04.1_amd64.deb distro-info amd64 0.18ubuntu0.18.04.1~bpo18.04.1 [20.3 kB]
debconf: delaying package configuration, since apt-utils is not installed
(Reading database ... 13054 files and directories currently installed.)
Preparing to unpack .../distro-info_0.18ubuntu0.18.04.1~bpo18.04.1_amd64.deb ...
Unpacking distro-info (0.18ubuntu0.18.04.1~bpo18.04.1) over (0.18~ubuntu16.04.1) ...
Setting up distro-info (0.18ubuntu0.18.04.1~bpo18.04.1) ...


With that things work again.

root at x-bpotest:~# distro-info --lts
focal
root at x-bpotest:~# distro-info --supported-esm
xenial
bionic
focal


Review of the changes:
1. The debdiff to 0.18ubuntu0.18.04.1 in current bionic-updates
  $ debdiff distro-info_0.18ubuntu0.18.04.1.dsc distro-info_0.18ubuntu0.18.04.1~bpo18.04.1.dsc
  - set distro-info-data that has been the backport of esm data in xenial-updates
  - use older debian/compat
  - changelog referring to this bug
  => That should be save and just right
2. The debdiff to the 0.18~ubuntu16.04.1 in current xenial-backports 
  $ debdiff distro-info_0.18~ubuntu16.04.1.dsc distro-info_0.18ubuntu0.18.04.1~bpo18.04.1.dsc
  - same as above
  - support for the milestone eol-esm and add filters for supported-esm (LP: #1808038)
  => which is exactly what we want

So yes, this LGTM, please accept it to xenial-backports

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https://bugs.launchpad.net/bugs/1862305

Title:
  distro-info in xenial backports needs a newer distro-info-data and
  versioned dependency

Status in Xenial Backports:
  Won't Fix
Status in distro-info package in Ubuntu:
  Invalid

Bug description:
  Hi,
  askubuntu [1] made me aware of this issue.

  What I see is:
  root at x:~# apt-cache policy distro-info distro-info-data
  distro-info:
    Installed: (none)
    Candidate: 0.14ubuntu0.1
    Version table:
       0.18~ubuntu16.04.1 100
          100 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
       0.14ubuntu0.1 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
       0.14build1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  distro-info-data:
    Installed: 0.28ubuntu0.13
    Candidate: 0.28ubuntu0.13
    Version table:
   *** 0.28ubuntu0.13 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
          100 /var/lib/dpkg/status
       0.28 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  The distro-info in backports is this atm:
  https://launchpad.net/ubuntu/+source/distro-info/0.18~ubuntu16.04.1

  The problem is that this is non-functional with the `distro-info-data`
  in Xenial.

  $ apt install distro-info=0.18~ubuntu16.04.1
  $ distro-info --lts
  ubuntu-distro-info: Header `version,codename,series,created,release,eol,eol-server,eol-esm' in file `/usr/share/distro-info/ubuntu.csv' does not match excatly `version,codename,series,created,release,eol,eol-server'.

  For distro-info=0.18~ubuntu16.04.1 to work there should:
  - also be a distro-info-data in backports
  - the distro-info=0.18~ubuntu16.04.1 probably needs a versioned dependency on the newer distro-info

  [1]: https://askubuntu.com/questions/1208133/virtual-machine-with-
  uvitools-problem

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