[haskell-platform] #190: uninstall-hs should check that system has greator version of GHC or not

[haskell-platform]

#190: uninstall-hs should check that system has greator version of GHC or not
---------------------------+------------------------------------------------
 Reporter:  shelarcy       |       Owner:  gregorycollins
     Type:  defect         |      Status:  new           
 Priority:  major          |   Milestone:                
Component:  OSX installer  |    Keywords:  uninstall-hs  
---------------------------+------------------------------------------------
 uninstall-hs works well if system has only Haskell Platform version or
 prior version of GHC. But if system has greator version of GHC, uninstall-
 hs causes undesirable result.


 For example:

 My system already has GHC 7.2.2, I installed Haskell Platform 2011.4.0.0
 (GHC 7.0.4), and then I installed GHC HEAD's binary pkg for testing. After
 testing, I tried to remove GHC HEAD by using uninstall-hs. uninstall-hs
 removes /usr/bin/ghc and /usr/bin/cabal symbolic link accidently.

 {{{
 $ sudo uninstall-hs only 7.5.20111221 --remove
 $ ghc -V-bash: /usr/bin/ghc: No such file or directory
 $ cabal -V
 cabal: unrecognised command: -v (try --help)
 }}}

 And uninsatll-hs can't parse GHC 7.4.1 RC 1's version.

 {{{
 $ sudo uninstall-hs only 7.4.0.20111219 --remove
 *** couldn't parse version
 Usage: uninstall-hs              -- find versions on system
        uninstall-hs thru VERSION -- remove VERSION and earlier
        uninstall-hs only VERSION -- remove only VERSION
        uninstall-hs all          -- remove all
 NOTE: Commands are 'dry run' by default and don't actually delete.
 Options (can appear anywhere):
   -v  --verbose       report each path
   -n  --dry-run       only report what would be removed
   -s  --sh, --script  generate a shell script to remove files
   -r  --rm, --remove  actually remove files
   -?  --help          help (this message)
 }}}

 Okay, /Library/Haskell/doc/start.html says that uninstall-hs can remove
 just current and prior version. But there is one more problem. My system
 was installed GHC 7.0.4, 7.2.2, and HEAD (7.5.20111221). So, if using
 GHC's uninstaller
 (/Library/Frameworks/GHC.framework/Versions/<version>/Tools/Uninstaller),
 /usr/bin/ghc is changes into GHC 7.2.2 instead of 7.0.4. This is
 undesirable result, too.

 And same problem occur when uninstall-hs removes Haskell Platform's GHC
 7.0.4 if system has greator version....

 I think that uninstall-hs should check system has greator version of GHC
 or not in /Library/Frameworks/GHC.framework/Versions/ directory.

-- 
Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/190>
haskell-platform <http://trac.haskell.org/haskell-platform>
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