Todd Gamblin 8e8235043d package_prefs: move class-level cache to PackagePref instance ... `PackagePrefs` has had a class-level cache of data from `packages.yaml` for a long time, but it complicates testing and leads to subtle errors, especially now that we frequently manipulate custom config scopes and environments. Moving the cache to instance-level doesn't slow down concretization or the test suite, and it just caches for the life of a `PackagePrefs` instance (i.e., for a single cocncretization) so we don't need to worry about global state anymore. - [x] Remove class-level caches from `PackagePrefs` - [x] Add a cached _spec_order object on each `PackagePrefs` instance - [x] Remove all calls to `PackagePrefs.clear_caches()`		2019-12-30 13:01:31 -08:00
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util	package_prefs: move class-level cache to PackagePref instance	2019-12-30 13:01:31 -08:00
__init__.py	copyright: update license headers for 2013-2019 copyright.	2019-01-01 00:44:28 -08:00