When ll_mkdir functionality was moved to PuterFSProvider, ACL and FSLock
concerns were erroneously moved into PuterFSProvider. The intended
design has ll_mkdir responsible for ACL and FSLock, and providers should
never be responsible for ACL.
An important note: it was noticed during this change that mkdir in
PuterFSProvider implements its own ACL check, instead of the ACL check
being performed in ll_mkdir. This means permissions won't be checked for
other implementors of mkdir! This needs to be fixed before custom
filesystem implementations can be considered production-ready.
This temporary proxy provider will allow methods of the puterfs
filesystem type to be moved to an extension incrementally instead of all
at once. See comment above the class for a more detailed explanation.
This extension has a copy of memoryfs which is exposed as `testfs`. The
purpose of this is to register a new filesystem type from an extension
to ensure it works as expected and to get feedback on a working example.
