From 2e10e621c4b1fa69356d19f1f2b9b447f9d55b70 Mon Sep 17 00:00:00 2001
From: Pat Hickey <pat@moreproductive.org>
Date: Fri, 29 Jan 2021 17:02:57 -0800
Subject: [PATCH] stub virtfs

---
 crates/wasi-common/virtfs/Cargo.toml  | 18 ++++++
 crates/wasi-common/virtfs/src/dir.rs  | 82 +++++++++++++++++++++++++++
 crates/wasi-common/virtfs/src/file.rs | 73 ++++++++++++++++++++++++
 crates/wasi-common/virtfs/src/lib.rs  |  2 +
 4 files changed, 175 insertions(+)
 create mode 100644 crates/wasi-common/virtfs/Cargo.toml
 create mode 100644 crates/wasi-common/virtfs/src/dir.rs
 create mode 100644 crates/wasi-common/virtfs/src/file.rs
 create mode 100644 crates/wasi-common/virtfs/src/lib.rs

diff --git a/crates/wasi-common/virtfs/Cargo.toml b/crates/wasi-common/virtfs/Cargo.toml
new file mode 100644
index 0000000000..4a760434a6
--- /dev/null
+++ b/crates/wasi-common/virtfs/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "wasi-virtfs"
+version = "0.22.0"
+authors = ["The Wasmtime Project Developers"]
+description = "WASI implementation in Rust"
+license = "Apache-2.0 WITH LLVM-exception"
+categories = ["wasm"]
+keywords = ["webassembly", "wasm"]
+repository = "https://github.com/bytecodealliance/wasmtime"
+readme = "README.md"
+edition = "2018"
+include = ["src/**/*", "LICENSE" ]
+publish = false
+
+[dependencies]
+wasi-common = { path = "../", version = "0.22.0" }
+anyhow = "1.0"
+cap-std = "0.12"
diff --git a/crates/wasi-common/virtfs/src/dir.rs b/crates/wasi-common/virtfs/src/dir.rs
new file mode 100644
index 0000000000..45396e7de9
--- /dev/null
+++ b/crates/wasi-common/virtfs/src/dir.rs
@@ -0,0 +1,82 @@
+use crate::file::File;
+use std::any::Any;
+use std::path::{Path, PathBuf};
+use wasi_common::{
+    dir::{ReaddirCursor, ReaddirEntity, WasiDir},
+    file::{FdFlags, FileCaps, FileType, Filestat, OFlags, WasiFile},
+    Error, ErrorExt,
+};
+
+pub struct Dir;
+
+impl Dir {}
+
+impl WasiDir for Dir {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn open_file(
+        &self,
+        symlink_follow: bool,
+        path: &str,
+        oflags: OFlags,
+        caps: FileCaps,
+        fdflags: FdFlags,
+    ) -> Result<Box<dyn WasiFile>, Error> {
+        todo!()
+    }
+
+    fn open_dir(&self, symlink_follow: bool, path: &str) -> Result<Box<dyn WasiDir>, Error> {
+        todo!()
+    }
+
+    fn create_dir(&self, path: &str) -> Result<(), Error> {
+        todo!()
+    }
+    fn readdir(
+        &self,
+        cursor: ReaddirCursor,
+    ) -> Result<Box<dyn Iterator<Item = Result<(ReaddirEntity, String), Error>>>, Error> {
+        todo!()
+    }
+
+    fn symlink(&self, src_path: &str, dest_path: &str) -> Result<(), Error> {
+        todo!()
+    }
+    fn remove_dir(&self, path: &str) -> Result<(), Error> {
+        todo!()
+    }
+
+    fn unlink_file(&self, path: &str) -> Result<(), Error> {
+        todo!()
+    }
+    fn read_link(&self, path: &str) -> Result<PathBuf, Error> {
+        todo!()
+    }
+    fn get_filestat(&self) -> Result<Filestat, Error> {
+        todo!()
+    }
+    fn get_path_filestat(&self, path: &str, follow_symlinks: bool) -> Result<Filestat, Error> {
+        todo!()
+    }
+    fn rename(&self, src_path: &str, dest_dir: &dyn WasiDir, dest_path: &str) -> Result<(), Error> {
+        todo!()
+    }
+    fn hard_link(
+        &self,
+        src_path: &str,
+        target_dir: &dyn WasiDir,
+        target_path: &str,
+    ) -> Result<(), Error> {
+        todo!()
+    }
+    fn set_times(
+        &self,
+        path: &str,
+        atime: Option<wasi_common::SystemTimeSpec>,
+        mtime: Option<wasi_common::SystemTimeSpec>,
+        follow_symlinks: bool,
+    ) -> Result<(), Error> {
+        todo!()
+    }
+}
diff --git a/crates/wasi-common/virtfs/src/file.rs b/crates/wasi-common/virtfs/src/file.rs
new file mode 100644
index 0000000000..1e3e775284
--- /dev/null
+++ b/crates/wasi-common/virtfs/src/file.rs
@@ -0,0 +1,73 @@
+use cap_std::Advice;
+use std::any::Any;
+use std::convert::TryInto;
+use std::io;
+use wasi_common::{
+    file::{FdFlags, FileType, Filestat, WasiFile},
+    Error,
+};
+
+pub struct File;
+
+impl File {}
+
+impl WasiFile for File {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn datasync(&self) -> Result<(), Error> {
+        Ok(())
+    }
+    fn sync(&self) -> Result<(), Error> {
+        Ok(())
+    }
+    fn get_filetype(&self) -> Result<FileType, Error> {
+        todo!()
+    }
+    fn get_fdflags(&self) -> Result<FdFlags, Error> {
+        todo!()
+    }
+    fn set_fdflags(&mut self, fdflags: FdFlags) -> Result<(), Error> {
+        todo!()
+    }
+    fn get_filestat(&self) -> Result<Filestat, Error> {
+        todo!()
+    }
+    fn set_filestat_size(&self, size: u64) -> Result<(), Error> {
+        todo!()
+    }
+    fn advise(&self, _offset: u64, _len: u64, _advice: Advice) -> Result<(), Error> {
+        Ok(())
+    }
+    fn allocate(&self, offset: u64, len: u64) -> Result<(), Error> {
+        todo!()
+    }
+    fn set_times(
+        &self,
+        atime: Option<wasi_common::SystemTimeSpec>,
+        mtime: Option<wasi_common::SystemTimeSpec>,
+    ) -> Result<(), Error> {
+        todo!()
+    }
+    fn read_vectored(&self, bufs: &mut [io::IoSliceMut]) -> Result<u64, Error> {
+        todo!()
+    }
+    fn read_vectored_at(&self, bufs: &mut [io::IoSliceMut], offset: u64) -> Result<u64, Error> {
+        todo!()
+    }
+    fn write_vectored(&self, bufs: &[io::IoSlice]) -> Result<u64, Error> {
+        todo!()
+    }
+    fn write_vectored_at(&self, bufs: &[io::IoSlice], offset: u64) -> Result<u64, Error> {
+        todo!()
+    }
+    fn seek(&self, pos: std::io::SeekFrom) -> Result<u64, Error> {
+        todo!()
+    }
+    fn peek(&self, buf: &mut [u8]) -> Result<u64, Error> {
+        todo!()
+    }
+    fn num_ready_bytes(&self) -> Result<u64, Error> {
+        todo!()
+    }
+}
diff --git a/crates/wasi-common/virtfs/src/lib.rs b/crates/wasi-common/virtfs/src/lib.rs
new file mode 100644
index 0000000000..f8abfac3c4
--- /dev/null
+++ b/crates/wasi-common/virtfs/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod file;
+pub mod dir;