Arch Linux

The fuse2 optimizations break rofiles-fuse (ostree) when ostree is built with fuse3.

> Initializing build dir
> Committing stage init to cache
> Starting build of
> fuse: unknown option(s): `-o splice_write,splice_move'
> ========================================================================
> Building module bcal in /tmp/wrk/flatpak-builder/build/bcal-1
> ========================================================================
> error: Build directory /tmp/wrk/flatpak-builder/rofiles/rofiles-nmtbGu not initialized, use flatpak build-init
> Error: module bcal: Child process exited with code 1


I suggest disabling the optimizations by dropping the `--with-fuse=2` build config option.
An alternative would be switching to fuse3.
And it's also possible to enable both by setting `--with-fuse=2,3`
I confirmed that `ASSUME_FUSE_2` is not set in `config.h` when making any of the suggested changes.

I have only been testing flatpak-builder built with fuse2 against ostree built with fuse3, so I can only say that the first suggestion works perfectly for me. I can't comment about the others yet, but I'll very likely switch flatpak-builder to fuse3 soon.

See: flatpak-builder: context: Make FUSE 2 optimizations opt-in https://github.com/flatpak/flatpak-builder/commit/99b35552274150bd

Blocking  FS#75410