[Hackage] #380: Ability to blacklist packages that are on hackage

[Hackage]

#380: Ability to blacklist packages that are on hackage
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  Reporter:  guest               |        Owner:         
      Type:  defect              |       Status:  new    
  Priority:  normal              |    Milestone:         
 Component:  cabal-install tool  |      Version:  1.2.3.0
  Severity:  normal              |   Resolution:         
  Keywords:  wishlist blacklist  |   Difficulty:  normal 
Ghcversion:  6.8.3               |     Platform:         
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Comment (by duncan):

 Chucking some extra constraints in is easy. The hard part is tracking them
 so we can report where they came from and if they were used.

 Saying that a package was not used due to blacklisting is quite hard
 really. I guess one could inspect the constraints at the end for each
 package and check if any packages were excluded only due to the specific
 blacklist constraint. If it was then we could check if that package would
 have been the preferred version vs the version actually picked.

 This relies closely on the way in which the current solver works and what
 internal method it uses and the information it collects. That's not great
 because we would like to make the algorithm pluggable so that we can
 easily experiment with improved algorithms.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/380#comment:1>
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