Summary:
Fixes T12986. I caught this bug in the changes from D18584: when we moved a large hunk to file storage, we would decompress it but keep the "deflated" flag. This could cause confusion when loading it later. I missed this in testing since I wasn't exhaustive enough in checking hunks and didn't run into a compressed one.
Instead of compressing on `save()`, compress during the normal workflow.
We currently never advise users to run this workflow so I didn't bother trying to clean up possible existing migrations.
Test Plan:
- Ran `bin/differential migrate-hunk` on compressed hunks, moving them to and from file storage. Saw them work correctly and remain compressed.
- Created new small (uncompressed) and large (compressed) hunks, verified they work properly and get compressed (if applicable).
- Used `bin/cache purge --caches changeset` to clear changeset caches and make sure the actual table was being hit.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T12986
Differential Revision: https://secure.phabricator.com/D18624
156adccef0