[Bug 1821308] Re: apt-get upgrade ignores pinning preferences since 1.0.1ubuntu2.22

[larsen]

I have enabled the "proposed" repository and installed apt
"1.0.1ubuntu2.23". Though, even after another "apt-get update", "apt-get
upgrade" still wants to downgrade my "burp" package.

It's noticeable that "policy's output" now contains a different
"Candidate" version number.


# dpkg -l apt
(snip)
ii  apt                                1.0.1ubuntu2.23
amd64                  commandline package manager

# apt-cache policy burp
burp:
   Installed: 2.0.54-1
   Candidate: 1.3.48-4
   Package pin: 2.0.54-1
   Version table:
  *** 2.0.54-1 1000
         100 /var/lib/dpkg/status
      1.3.48-4 1000
         500 https://ftp-stud.hs-esslingen.de/ubuntu/ trusty/universe amd64
Packages

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https://bugs.launchpad.net/bugs/1821308

Title:
  apt-get upgrade ignores pinning preferences since 1.0.1ubuntu2.22

Status in apt package in Ubuntu:
  Invalid
Status in apt source package in Trusty:
  Fix Committed

Bug description:
  [Impact]
  Pinning on local-only package versions is ignored, causing them to be upgraded.

  [Test case]
  The integration tests run in autopkgtest include an automated test case that contains a package called coolstuff in three versions. We are specifying a Pin for the installed one, set to 1000.

  The bug caused 1.0 to become the candidate, as the existing pin was
  ignored. The test checks that 2.0~bpo1 to remains the candidate, that
  is, apt-cache policy looks like this:

  coolstuff:
    Installed: 2.0~bpo1
    Candidate: 2.0~bpo1
    Package pin: 2.0~bpo1
    Version table:
       2.0~bpo2 1000
          100 file:${tmppath}/aptarchive/ backports/main i386 Packages
   *** 2.0~bpo1 1000
          100 ${tmppath}/rootdir/var/lib/dpkg/status
       1.0 1000
          500 file:${tmppath}/aptarchive/ stable/main i386 Packages

  On the output of the autopkgtest we'll see:

  Check that local-only versions can be pinned correctly (LP: #1821308)                                                 
  Test for successful execution of apt-cache policy coolstuff … PASS                                                         
  Test for correctness of file testsuccess.output … PASS      

  [Regression potential]
  Other weird pinning bugs.

  [Original bug report]

  I have updated apt this morning:

  Start-Date: 2019-03-22  09:36:18
  Commandline: apt-get dist-upgrade
  Upgrade: apt:amd64 (1.0.1ubuntu2.20, 1.0.1ubuntu2.22), ...

  Afterwards, apt-get ignores my pinning preferences:

  # apt-get --dry-run upgrade
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Calculating upgrade... Done
  The following packages will be DOWNGRADED:
    burp
  0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 0 not upgraded.
  Inst burp [2.0.54-1] (1.3.48-4 Ubuntu:14.04/trusty [amd64])
  Conf burp (1.3.48-4 Ubuntu:14.04/trusty [amd64])

  # cat /etc/apt/preferences.d/burp.pref
  Package: burp
  Pin: version 2.0.54*
  Pin-Priority: 1000

  This might be caused by bug 1814727 as it's the only thing I can see
  in the changelog regarding apt/pinning.

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