[GHC] #14017: "make install" with non-standard umask causes bad permission on package.cache

[GHC]

#14017: "make install" with non-standard umask causes bad permission on
package.cache
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        Reporter:  djf               |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.2
       Component:  Build System      |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
 Type of failure:  Installing GHC    |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13375, #13354,   |  Differential Rev(s):
  #13194                             |
       Wiki Page:                    |
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Comment (by bgamari):

 Actually, after looking the `umask` documentation more carefully I am even
 more confused. The mask is applied only to newly created files; this means
 that essential any file created during installation will need to `chmod`
 as well to ensure that the mode is set as expected in the event that the
 user has overridden umask.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14017#comment:7>
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