[Bug 1841516] Re: dpkg installation fails due to file conflict between python-cinderclient and python3-cinderclient

[Chris MacNaughton]

** Description changed:

+ [Impact]
+ 
+ When a user upgrades to the bionic-train cloud archive, it is possible
+ to run into a conflict between the python-cinderclient and
+ python3-cinderclient packages that manifests with this error:
+ 
+ Errors were encountered while processing:
+  /tmp/apt-dpkg-install-5QJYyK/23-python3-cinderclient_1%3a5.0.0-0ubuntu2~cloud0_all.deb
+ E: Sub-process /usr/bin/dpkg returned an error code (1)
+ 
+ [Test Case]
+ 
+ root at cinderclient-test:~# apt-add-repository cloud-archive:stein
+ root at cinderclient-test:~# apt install python-cinderclient
+ root at cinderclient-test:~# apt-add-repository cloud-archive:train
+ root at cinderclient-test:~# apt install python3-cinderclient
+ 
+ With a new package that adds in the correct Breaks/Replaces, the above
+ works as expected rather than erroring in dpkg
+ 
+ [Regression Potential]
+ 
+ Regression potential is minimal as the only change required for this is
+ to update the python3-cinderclient target to Break & Replace the python2
+ version.
+ 
+ ------------------------------------------------------------------------
+ 
  Upgrading python3-cinderclient from 1:4.1.0-0ubuntu1 to 2:4.2.1-0ubuntu2
  fails on Eoan due to a conflicting file between the two packages.
  
  It seems there is no equivalent 4.2 upgrade for python-cinderclient so
  anyone who previously had both versions installed now meet the conflict.
  
  lathiat at optane ~$ sudo apt-get dist-upgrade --auto-remove --purge
  Reading package lists... Done
- Building dependency tree       
+ Building dependency tree
  Reading state information... Done
  Calculating upgrade... Done
  The following packages have been kept back:
-   lldb
+   lldb
  The following packages will be upgraded:
-   python3-cinderclient
+   python3-cinderclient
  1 to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade.
  Need to get 0 B/139 kB of archives.
  After this operation, 5,120 B of additional disk space will be used.
- Do you want to continue? [Y/n] 
+ Do you want to continue? [Y/n]
  (Reading database ... 381723 files and directories currently installed.)
  Preparing to unpack .../python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb ...
  Unpacking python3-cinderclient (1:4.2.1-0ubuntu2) over (1:4.1.0-0ubuntu1) ...
  dpkg: error processing archive /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb (--unpack):
-  trying to overwrite '/usr/share/bash-completion/completions/cinder.bash_completion', which is also in package python-cinderclient 1:4.1.0-0ubuntu1
+  trying to overwrite '/usr/share/bash-completion/completions/cinder.bash_completion', which is also in package python-cinderclient 1:4.1.0-0ubuntu1
  Errors were encountered while processing:
-  /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb
+  /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  lathiat at optane ~$

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https://bugs.launchpad.net/bugs/1841516

Title:
  dpkg installation fails due to file conflict between python-
  cinderclient and python3-cinderclient

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in python-cinderclient package in Ubuntu:
  Invalid

Bug description:
  [Impact]

  When a user upgrades to the bionic-train cloud archive, it is possible
  to run into a conflict between the python-cinderclient and
  python3-cinderclient packages that manifests with this error:

  Errors were encountered while processing:
   /tmp/apt-dpkg-install-5QJYyK/23-python3-cinderclient_1%3a5.0.0-0ubuntu2~cloud0_all.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  [Test Case]

  root at cinderclient-test:~# apt-add-repository cloud-archive:stein
  root at cinderclient-test:~# apt install python-cinderclient
  root at cinderclient-test:~# apt-add-repository cloud-archive:train
  root at cinderclient-test:~# apt install python3-cinderclient

  With a new package that adds in the correct Breaks/Replaces, the above
  works as expected rather than erroring in dpkg

  [Regression Potential]

  Regression potential is minimal as the only change required for this
  is to update the python3-cinderclient target to Break & Replace the
  python2 version.

  ------------------------------------------------------------------------

  Upgrading python3-cinderclient from 1:4.1.0-0ubuntu1 to
  2:4.2.1-0ubuntu2 fails on Eoan due to a conflicting file between the
  two packages.

  It seems there is no equivalent 4.2 upgrade for python-cinderclient so
  anyone who previously had both versions installed now meet the
  conflict.

  lathiat at optane ~$ sudo apt-get dist-upgrade --auto-remove --purge
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Calculating upgrade... Done
  The following packages have been kept back:
    lldb
  The following packages will be upgraded:
    python3-cinderclient
  1 to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade.
  Need to get 0 B/139 kB of archives.
  After this operation, 5,120 B of additional disk space will be used.
  Do you want to continue? [Y/n]
  (Reading database ... 381723 files and directories currently installed.)
  Preparing to unpack .../python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb ...
  Unpacking python3-cinderclient (1:4.2.1-0ubuntu2) over (1:4.1.0-0ubuntu1) ...
  dpkg: error processing archive /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb (--unpack):
   trying to overwrite '/usr/share/bash-completion/completions/cinder.bash_completion', which is also in package python-cinderclient 1:4.1.0-0ubuntu1
  Errors were encountered while processing:
   /var/cache/apt/archives/python3-cinderclient_1%3a4.2.1-0ubuntu2_all.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  lathiat at optane ~$

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