Patch wasmtime-wasi to use this wasi-common version

tests/runtime.rs

@@ -0,0 +1,56 @@
+use cranelift_codegen::settings;
+use wasmtime_jit::Context;
+
+pub fn instantiate<S: AsRef<str>>(
+    data: &[u8],
+    bin_name: S,
+    workspace: Option<S>,
+) -> Result<(), String> {
+    // Prepare runtime
+    let isa_builder =
+        cranelift_native::builder().map_err(|_| "host machine is not a supported target")?;
+    let flag_builder = settings::builder();
+    let isa = isa_builder.finish(settings::Flags::new(flag_builder));
+    let mut context = Context::with_isa(isa);
+    let global_exports = context.get_global_exports();
+
+    let get_preopens = |workspace: Option<S>| -> Result<Vec<_>, String> {
+        if let Some(workspace) = workspace {
+            let preopen_dir = wasi_common::preopen_dir(workspace.as_ref()).map_err(|e| {
+                format!(
+                    "error while preopening directory '{}': {}",
+                    workspace.as_ref(),
+                    e
+                )
+            })?;
+
+            Ok(vec![(".".to_owned(), preopen_dir)])
+        } else {
+            Ok(vec![])
+        }
+    };
+
+    context.name_instance(
+        "wasi_unstable".to_owned(),
+        wasmtime_wasi::instantiate_wasi(
+            "",
+            global_exports,
+            &get_preopens(workspace)?,
+            &[bin_name.as_ref().to_owned(), ".".to_owned()],
+            &[],
+        )
+        .map_err(|e| format!("error instantiating WASI: {}", e))?,
+    );
+
+    // Compile and instantiating a wasm module.
+    context
+        .instantiate_module(None, &data)
+        .map(|_| ())
+        .map_err(|e| {
+            format!(
+                "error while processing main module '{}': {}",
+                bin_name.as_ref(),
+                e
+            )
+        })
+}