feat: support sys-minimal feature

lib/wasix/Cargo.toml

@@ -202,7 +202,8 @@ webc_runner_rt_dproxy = [
 	"tower-http",
 	"journal",
 ]
-
+# the minimal sys implementation
+sys-minimal = ["wasmer/sys", "sys-thread", "tokio/fs"]
 sys = [
 	"webc/mmap",
 	"time",

lib/wasix/src/lib.rs

@@ -14,12 +14,21 @@
 //! [WASI plugin example](https://github.com/wasmerio/wasmer/blob/main/examples/plugin.rs)
 //! for an example of how to extend WASI using the WASI FS API.
 
-#[cfg(all(not(feature = "sys"), not(feature = "js")))]
-compile_error!("At least the `sys` or the `js` feature must be enabled. Please, pick one.");
+#[cfg(all(
+    not(feature = "sys"),
+    not(feature = "js"),
+    not(feature = "sys-minimal")
+))]
+compile_error!(
+    "At least the `sys` or the `js` or `sys-minimal` feature must be enabled. Please, pick one."
+);
 
-#[cfg(all(feature = "sys", feature = "js"))]
+#[cfg(any(
+    all(feature = "js", feature = "sys"),
+    all(feature = "js", feature = "sys-minimal")
+))]
 compile_error!(
-    "Cannot have both `sys` and `js` features enabled at the same time. Please, pick one."
+    "Cannot have both `sys` and `js` or `sys-minimal` and `sys` features enabled at the same time. Please, pick one."
 );
 
 #[cfg(all(feature = "sys", target_arch = "wasm32"))]

lib/wasix/src/state/handles/mod.rs

@@ -1,7 +1,7 @@
 mod global;
 mod thread_local;
 
-#[cfg(feature = "sys")]
+#[cfg(any(feature = "sys", feature = "sys-minimal"))]
 pub(crate) use global::*;
 #[cfg(feature = "js")]
 pub(crate) use thread_local::*;

lib/wasix/src/state/handles/thread_local.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(feature = "sys", allow(unused))]
+#![cfg_attr(any(feature = "sys", feature = "sys-minimal"), allow(unused))]
 use std::cell::{Ref, RefCell, RefMut};
 use std::ops::{Deref, DerefMut};
 use std::{