• Edward Z. Yang's avatar
    [ghc-pkg] Fix #5442 by using the flag db stack to modify packages. · d7c807f7
    Edward Z. Yang authored
    Summary:
    Previously, the full database stack was used for ghc-pkg to
    modify packages, which meant that commands like
    'ghc-pkg unregister --user' worked the same as 'ghc-pkg unregister'.
    Since package modification is a "read and write" operation, we
    should use the flag db stack (which is currently used for reads)
    to determine which database to update.
    
    There is also a new flag --user-package-db, which lets you explicitly
    set the user database (as seen by --user).  This was mostly added
    to aid in testing, but could be useful for end users as well.
    Signed-off-by: default avatarEdward Z. Yang <ezyang@cs.stanford.edu>
    
    Test Plan: validate
    
    Reviewers: simonmar, hvr, austin
    
    Subscribers: simonmar, relrod, carter
    
    Differential Revision: https://phabricator.haskell.org/D84
    d7c807f7
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