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Disable lint cache by default
Summary: Fixes T2266. Motivation: - The lint cache does not always invalidate correctly. Because of the nature of the cache, this is a hard problem (right after "naming things"). - We already have a fair amount of complexity in trying to invalidate it, and are still discovering new places where it doesn't work (e.g., Windows with "/" vs "\" paths). - One invalidation failure is when linter code changes, which seems unresolvable in the general case (e.g., changes to external linters). - It's not obvious what's happening when the lint cache causes some kind of issue. - Particularly while developing or debugging linters, your changes often won't be reflected in the lint output. Some of this is theoretically tractable but the external linter case probably isn't. - When someone reports a problem with the lint cache in IRC or elsewhere, there is essentially never a way for me to fix it. The lint cache can't be debugged effectively without access to a working copy where the problem reproduces. - The cache provides limited benefit outside of Facebook's install. To remedy these issues: - Introduce configuration which controls cache usage. - Default it off. - Print a message when the cache is in use. (I'd tentatively support removing the cache entirely, but I don't know how @vrana and Facebook feel about that.) Test Plan: Ran `arc set-config --show`, `arc lint --cache 0`, `arc lint --cache 1`. Reviewers: vrana, btrahan Reviewed By: vrana CC: aran, mbishopim3, nh, edward, wez Maniphest Tasks: T2266 Differential Revision: https://secure.phabricator.com/D5766
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