dont try to make a virtfs today. instead, delete virtfs example.

examples/wasi-fs/main.c

@@ -1,122 +0,0 @@
-/*
-Example of instantiating a WebAssembly which uses WASI imports.
-
-You can compile and run this example on Linux with:
-
-   cargo build --release -p wasmtime-c-api
-   cc examples/wasi-fs/main.c \
-       -I crates/c-api/include \
-       -I crates/c-api/wasm-c-api/include \
-       target/release/libwasmtime.a \
-       -lpthread -ldl -lm \
-       -o wasi-fs
-   ./wasi-fs
-
-Note that on Windows and macOS the command will be similar, but you'll need
-to tweak the `-lpthread` and such annotations.
-*/
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <wasm.h>
-#include <wasi.h>
-#include <wasmtime.h>
-
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-
-static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap);
-
-int main() {
-  int ret = 0;
-  // Set up our context
-  wasm_engine_t *engine = wasm_engine_new();
-  assert(engine != NULL);
-  wasm_store_t *store = wasm_store_new(engine);
-  assert(store != NULL);
-
-  wasm_byte_vec_t wasm;
-  // Load our input file to parse it next
-  FILE* file = fopen("target/wasm32-wasi/debug/wasi-fs.wasm", "rb");
-  if (!file) {
-    printf("> Error loading file!\n");
-    exit(1);
-  }
-  fseek(file, 0L, SEEK_END);
-  size_t file_size = ftell(file);
-  wasm_byte_vec_new_uninitialized(&wasm, file_size);
-  fseek(file, 0L, SEEK_SET);
-  if (fread(wasm.data, file_size, 1, file) != 1) {
-    printf("> Error loading module!\n");
-    exit(1);
-  }
-  fclose(file);
-
-  // Compile our modules
-  wasm_module_t *module = NULL;
-  wasmtime_error_t *error = wasmtime_module_new(engine, &wasm, &module);
-  if (!module)
-    exit_with_error("failed to compile module", error, NULL);
-  wasm_byte_vec_delete(&wasm);
-
-  // Instantiate wasi
-  wasi_config_t *wasi_config = wasi_config_new();
-  assert(wasi_config);
-  wasi_config_inherit_argv(wasi_config);
-  wasi_config_inherit_env(wasi_config);
-  wasi_config_inherit_stdin(wasi_config);
-  wasi_config_inherit_stdout(wasi_config);
-  wasi_config_inherit_stderr(wasi_config);
-  wasi_config_preopen_dir(wasi_config, "examples/wasi-fs", ".");
-  wasm_trap_t *trap = NULL;
-  wasi_instance_t *wasi = wasi_instance_new(store, "wasi_snapshot_preview1", wasi_config, &trap);
-  if (wasi == NULL)
-    exit_with_error("failed to instantiate WASI", NULL, trap);
-
-  wasmtime_linker_t *linker = wasmtime_linker_new(store);
-  error = wasmtime_linker_define_wasi(linker, wasi);
-  if (error != NULL)
-    exit_with_error("failed to link wasi", error, NULL);
-
-  // Instantiate the module
-  wasm_name_t empty;
-  wasm_name_new_from_string(&empty, "");
-  wasm_instance_t *instance = NULL;
-  error = wasmtime_linker_module(linker, &empty, module);
-  if (error != NULL)
-    exit_with_error("failed to instantiate module", error, NULL);
-
-  // Run it.
-  wasm_func_t* func;
-  wasmtime_linker_get_default(linker, &empty, &func);
-  if (error != NULL)
-    exit_with_error("failed to locate default export for module", error, NULL);
-
-  wasm_val_vec_t args_vec = WASM_EMPTY_VEC;
-  wasm_val_vec_t results_vec = WASM_EMPTY_VEC;
-  error = wasmtime_func_call(func, &args_vec, &results_vec, &trap);
-  if (error != NULL)
-    exit_with_error("error calling default export", error, trap);
-
-  // Clean up after ourselves at this point
-  wasm_name_delete(&empty);
-  wasm_module_delete(module);
-  wasm_store_delete(store);
-  wasm_engine_delete(engine);
-  return 0;
-}
-
-static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap) {
-  fprintf(stderr, "error: %s\n", message);
-  wasm_byte_vec_t error_message;
-  if (error != NULL) {
-    wasmtime_error_message(error, &error_message);
-    wasmtime_error_delete(error);
-  } else {
-    wasm_trap_message(trap, &error_message);
-    wasm_trap_delete(trap);
-  }
-  fprintf(stderr, "%.*s\n", (int) error_message.size, error_message.data);
-  wasm_byte_vec_delete(&error_message);
-  exit(1);
-}

examples/wasi-fs/main.rs

@@ -1,46 +0,0 @@
-//! Example of running a wasi binary in a memory filesystem
-
-// The corresponding wasm binary can be built with:
-// `cargo build -p example-wasi-fs-wasm --target wasm32-wasi`
-//
-// then you can execute this example with `cargo run --example wasi-fs`
-
-use anyhow::Result;
-use std::collections::HashMap;
-use wasmtime::*;
-use wasmtime_wasi::virtfs::{VecFileContents, VirtualDirEntry};
-use wasmtime_wasi::{Wasi, WasiCtxBuilder};
-
-fn main() -> Result<()> {
-    tracing_subscriber::FmtSubscriber::builder()
-        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
-        .with_ansi(true)
-        .init();
-
-    let store = Store::default();
-    let mut linker = Linker::new(&store);
-
-    // Create an instance of `Wasi` which contains a `WasiCtx`. Note that
-    // `WasiCtx` provides a number of ways to configure what the target program
-    // will have access to.
-    let entry = VirtualDirEntry::File(Box::new(VecFileContents::with_content(
-        "world".as_bytes().to_owned(),
-    )));
-    let mut map = HashMap::new();
-    map.insert("test.txt".to_string(), entry);
-    let dir = VirtualDirEntry::Directory(map);
-    let ctx = WasiCtxBuilder::new()
-        .inherit_stdout()
-        .inherit_stderr()
-        .preopened_virt(dir, ".")
-        .build()?;
-    let wasi = Wasi::new(&store, ctx);
-    wasi.add_to_linker(&mut linker)?;
-
-    // Instantiate our module with the imports we've created, and run it.
-    let module = Module::from_file(store.engine(), "target/wasm32-wasi/debug/wasi-fs.wasm")?;
-    linker.module("", &module)?;
-    linker.get_default("")?.get0::<()>()?()?;
-
-    Ok(())
-}

examples/wasi-fs/test.txt

@@ -1 +0,0 @@
-world

examples/wasi-fs/wasm/Cargo.toml

@@ -1,10 +0,0 @@
-[package]
-name = "example-wasi-fs-wasm"
-version = "0.0.0"
-authors = ["The Wasmtime Project Developers"]
-edition = "2018"
-publish = false
-
-[[bin]]
-path = "wasi-fs.rs"
-name = "wasi-fs"

examples/wasi-fs/wasm/wasi-fs.rs

@@ -1,4 +0,0 @@
-fn main() {
-    let contents = std::fs::read_to_string("test.txt").unwrap();
-    println!("Hello, {}!", contents);
-}