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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: Edward Z. Yang <ezyang@cs.stanford.edu>
Test Plan: validate
Reviewers: simonmar, hvr, austin
Subscribers: simonmar, relrod, carter
Differential Revision: https://phabricator.haskell.org/D84
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