[GHC] #9808: Add data-dir to InstalledPackageInfo

[GHC]

#9808: Add data-dir to InstalledPackageInfo
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       Reporter:  luite              |                   Owner:  luite
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Compiler           |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 Currently, the data directory of a package is not stored in the package
 database. This is fine for programs produced by GHC, where programs know
 the location of their own data files through the `Paths_packagename`
 module, but it's not sufficient for programs that do not have direct
 access to the local filesystem.

 Programs produced by GHCJS should be able to load their data files over
 HTTP. If GHCJS would know the `data-dir` location of all packages, it
 could make the data files for all dependencies available when linking, and
 generate a `FilePath -> URI` mapping table. The best it can currently do
 is making all files on the hard drive available.

 I have a patch for this that I'll submit once I've figured out how
 Phabricator works ;)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9808>
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