qcow2fuse VS libsqlfs

Not purely in-memory, but something like https://github.com/jrwwallis/qcow2fuse maybe? It's clunky compared to OSX's DMGs, but if you squint it achieves similar ends.

Otherwise you could achieve this with a tmpfs wrapped to serialize to a tarball (preserving symlinks) when unmounted.

Closest I found: https://github.com/guardianproject/libsqlfs

> The libsqlfs library implements a POSIX style file system on top of an SQLite database. It allows applications to have access to a full read/write file system in a single file, complete with its own file hierarchy and name space. This is useful for applications which needs structured storage, such as embedding documents within documents, or management of configuration data or preferences. Libsqlfs can be used as an shared library, or it can be built as a FUSE (Linux File System in User Space) module to allow a libsqlfs database to be accessed via OS level file system interfaces by normal applications.

- Use clone file to duplicate the cached data directory to give to individual tests.

One thing I'd like to pursue is to store the Postgres data dir in SQLite [1]. Then, I can reset the "file system" using SQL after each test instead of copying the entire datadir.

[1]: https://github.com/guardianproject/libsqlfs

Not sure about compression but somebody could probably hack it in an afternoon using this:

https://github.com/guardianproject/libsqlfs

or something similar to check the potential for speed up.

Maybe there isn't a database engine that explicitly supports file system daya structures, but you could implement a filesystem in the application layer using SQLite as a storage mechanism.

Here's an example of someone doing that very thing.

https://github.com/guardianproject/libsqlfs

now let's see what it takes to make absurd-fs, where we use https://github.com/guardianproject/libsqlfs to make a filesystem on top of sqlite on top of the File System Access API.

gotta keep ourselves fully looped. ⥀