Todd Gamblin 102ac7bcf1 Move provider cache to home directory and refactor Transactions ... Major stuff: - Created a FileCache for managing user cache files in Spack. Currently just handles virtuals. - Moved virtual cache from the repository to the home directory so that users do not need write access to Spack repositories to use them. - Refactored `Transaction` class in `database.py` -- moved it to `LockTransaction` in `lock.py` and made it reusable by other classes. Other additions: - Added tests for file cache and transactions. - Added a few more tests for database - Fixed bug in DB where writes could happen even if exceptions were raised during a transaction. - `spack uninstall` now attempts to repair the database when it discovers that a prefix doesn't exist but a DB record does.		2016-08-09 00:24:54 -07:00
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spack	Move provider cache to home directory and refactor Transactions	2016-08-09 00:24:54 -07:00