[GHC] #15469: Validation doesn't play nicely on a shared computer

[GHC]

#15469: Validation doesn't play nicely on a shared computer
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           Reporter:  goldfire       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Test Suite     |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In my shared Linux server, validation creates a directory structure under
 `/tmp` to do its work. It then creates a directory named something like
 `ghctest-52ezqtk2` under which the tests live. However, some of the tests
 in the testsuite are library tests. These end up in a `libraries`
 directory, accessed with prefixes like `../../libraries/xyz`. That is, the
 `libraries` directory ends up to be `/tmp/libraries`. The problem is that
 I share this Linux server with my students, who are also attempting to run
 validation. After the occasional cleanout of `/tmp`, whoever validates
 first creates the `/tmp/libraries` directory and then owns that directory
 -- anyone else who tries to validate gets permission errors until the next
 cleanout of `tmp`.

 Even with the presumably quick fix of changing the permissions on
 `libraries`, the very use of that folder means that two people cannot
 validate simultaneously on the same machine.

 Can we fix this?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15469>
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