[Bug 1248433] [NEW] incorrect behavior when dependency is missing for downgrade

[Stelian Galmati]

Public bug reported:

Having the following scenario:

Package: a
Status: install ok installed
Version: 2
Depends: b (= 2)
Architecture: all

Package: b
Status: install ok installed
Version: 2
Architecture: all

Package: a
Version: 1
Depends: b (= 1)
Architecture: all


If I mark_install a, version 1 then it will simply mark package a, version 2 for removal. 
I would expect an message like "... you have held broken packages" since package b, version 1 is missing from the repository.

Tested on:
--------------------------
Ubuntu 12.04 amd64
python-apt                                   0.8.3ubuntu7.1

Thanks

** Affects: python-apt (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- package is not downgraded, it is simply removed
+ incorrect behavior when dependency is missing for downgrade

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https://bugs.launchpad.net/bugs/1248433

Title:
  incorrect behavior when dependency is missing for downgrade

Status in “python-apt” package in Ubuntu:
  New

Bug description:
  Having the following scenario:

  Package: a
  Status: install ok installed
  Version: 2
  Depends: b (= 2)
  Architecture: all

  Package: b
  Status: install ok installed
  Version: 2
  Architecture: all

  Package: a
  Version: 1
  Depends: b (= 1)
  Architecture: all

  
  If I mark_install a, version 1 then it will simply mark package a, version 2 for removal. 
  I would expect an message like "... you have held broken packages" since package b, version 1 is missing from the repository.

  Tested on:
  --------------------------
  Ubuntu 12.04 amd64
  python-apt                                   0.8.3ubuntu7.1

  Thanks

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