feat: implement fuse-t feature

[killagu]

Use fuse-t to replace MacFUSE as the implementation of FUSE. fuse-t is based on NFS and does not require the use of kernel extensions. Installation can be done with lower privileges and it does not impact system stability.

[bergwolf]

Now that we have a third fuse session implementation, IMHO we should define a trait for all of them. But we can do it later on.

[bergwolf]

should be a feature only available on macos?

[killagu]

Yes, but features not support [target.'cfg(target_os = "macos")'.features]?

[bergwolf]

we use --ignore to test with privilege mode.

[killagu]

This case only run macos, has no --ignore run.

[killagu]

macfuse can not get privilege, becase it must click in System Setting.

[bergwolf]

Is the binary installed by default? I don't see it getting installed in the test setup.

[killagu]

Install by this script

wget https://github.com/macos-fuse-t/fuse-t/releases/download/1.0.24/fuse-t-macos-installer-1.0.24.pkg
sudo installer -pkg fuse-t-macos-installer-1.0.24.pkg -target /

[bergwolf]

There are a few warnings:

warning: unused import: `vmm_sys_util::tempdir::TempDir`
  --> tests/macfuse_smoke.rs:17:9
   |
17 |     use vmm_sys_util::tempdir::TempDir;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused import: `crate::example::macfuse`
  --> tests/macfuse_smoke.rs:19:9
   |
19 |     use crate::example::macfuse;
   |         ^^^^^^^^^^^^^^^^^^^^^^^

warning: function `validate_hello_file` is never used
  --> tests/macfuse_smoke.rs:21:8
   |
21 |     fn validate_hello_file(dest: &str) -> bool {
   |        ^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: function `exec` is never used
  --> tests/macfuse_smoke.rs:38:8
   |
38 |     fn exec(cmd: &str) -> Result<String> {
   |        ^^^^

warning: `fuse-backend-rs` (test "macfuse_smoke") generated 4 warnings (run `cargo fix --test "macfuse_smoke"` to apply 2 suggestions)

Not sure why CI didn't catch it.

Otherwise lgtm!

[killagu]

tests/macfuse_smoke.rs this file only run fuse-t enabled, so has warning in fusedev test.

Add feature = fuse-t works.

[bergwolf]

lgtm, thanks!