[GHC] #8251: Validate submodule references during pre-receive hook

[GHC]

#8251: Validate submodule references during pre-receive hook
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       Reporter:  hvr               |             Owner:  hvr
           Type:  task              |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  None              |           Version:  7.6.3
       Keywords:  admin git         |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 Right now, you can push a commit introducing a not-yet existing Git
 submodule commit reference.

 However, such commits can be rejected for submodule repositories hosted at
 git.haskell.org, thus forcing the user to push the submodule first, and
 only after that push the submodule-affecting commit in ghc.git

 This kind of sanity checking ghc.git commits will become more important,
 if more repositories are converted into Git submodules.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8251>
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