[GHC] #8741: `System.Directory.getPermissions` fails on read-only filesystem

[GHC]

#8741: `System.Directory.getPermissions` fails on read-only filesystem
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        Reporter:  hvr               |            Owner:  AlainODea
            Type:  bug               |           Status:  patch
        Priority:  high              |        Milestone:
       Component:  libraries/unix    |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  POSIX             |     Architecture:  Unknown/Multiple
 Type of failure:  Incorrect result  |       Difficulty:  Easy (less than 1
  at runtime                         |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"ecc92abad017cf12d8eb83509d4d57ae14ad47f9/unix"]:
 {{{
 #!CommitTicketReference repository="unix"
 revision="ecc92abad017cf12d8eb83509d4d57ae14ad47f9"
 Handle EROFS/ETXTBSY as permission denied in `fileAccess` (re #8741)

 This extends `System.Posix.Files.`access` to map EROFS & ETXTBSY to
 mean permission denied just like EACCESS.

 Based on a patch by Alain O'Dea and comments by Duncan Coutts

 Authored-by: Alain O'Dea <alain.odea at verafin.com>
 Signed-off-by: Herbert Valerio Riedel <hvr at gnu.org>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8741#comment:4>
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