dangling directories are a windows thing

crates/test-programs/TEST_FAILURES

@@ -14,10 +14,6 @@
 
 * fd_readdir
     - DirEntry metadata ino panics on windows: https://github.com/bytecodealliance/cap-std/issues/142
-* file_allocate
-    - call to fd_allocate(10,10) reduces size from 100 to 20
-    - fix upstream: fd_allocate is impossible on windows, so dont even try
-    - the test should be modified to accept this fd_allocate always failing on windows.
 * nofollow_errors
     - I loosened up some errno acceptance but windows requires rmdir to delete
       a symlink to a directory, rather than unlink_file
@@ -25,10 +21,6 @@
 * symlink_create
     - narrowed down the symlink delete issue that only shows up on linux
     - dan is doing the upstream fix rn
-* path_rename
-    - permission denied on windows to rename a dir to an existing empty dir
-* path_link
-    - passes everything except dangling symlinks
 * fd_flags_set
     - same metadata panic as fd_readdir
 * path_filestat
@@ -41,17 +33,11 @@
     - on windows, opening a directory with a trailing slash fails.
 * path_rename_file_trailing_slashes
     - same incorrect behavior as linux
-* path_symlink_trailing_slashes
+
-    - dangling symlinks are not supported, different errnos in four spots
+
+* dangling_fd
+* dangling_symlink
+* path_rename_trailing_slashes
 * remove_directory_trailing_slashes
-    - different errno in one case
+* symlink_filestat
-* unlink_file_trailing_slashes
+* symlink_loop
-    - different errnos in three spots
-
-
-# Test Divergences
-
-* fd_allocate supported or not
-* dangling symlinks supported or not
-* errno: windows or linux mode?
-

crates/test-programs/tests/wasm_tests/runtime.rs

@@ -34,7 +34,8 @@ pub fn instantiate(data: &[u8], bin_name: &str, workspace: Option<&Path>) -> any
                 .env("ERRNO_MODE_WINDOWS", "1")?
                 .env("NO_DANGLING_SYMLINKS", "1")?
                 .env("NO_FD_ALLOCATE", "1")?
-                .env("NO_RENAME_DIR_TO_EMPTY_DIR", "1")?;
+                .env("NO_RENAME_DIR_TO_EMPTY_DIR", "1")?
+                .env("NO_DANGLING_DIRECTORY", "1")?;
         }
         #[cfg(unix)]
         {

crates/test-programs/wasi-tests/src/bin/dangling_fd.rs

@@ -1,6 +1,6 @@
 use more_asserts::assert_gt;
 use std::{env, process};
-use wasi_tests::open_scratch_directory;
+use wasi_tests::{open_scratch_directory, TESTCONFIG};
 
 unsafe fn test_dangling_fd(dir_fd: wasi::Fd) {
     // Create a file, open it, delete it without closing the handle,
@@ -17,6 +17,7 @@ unsafe fn test_dangling_fd(dir_fd: wasi::Fd) {
     let fd = wasi::path_open(dir_fd, 0, "file", wasi::OFLAGS_CREAT, 0, 0, 0).unwrap();
     wasi::fd_close(fd).unwrap();
 
+    if TESTCONFIG.support_dangling_directory() {
         // Now, repeat the same process but for a directory
         wasi::path_create_directory(dir_fd, "subdir").expect("failed to create dir");
         let subdir_fd = wasi::path_open(dir_fd, 0, "subdir", wasi::OFLAGS_DIRECTORY, 0, 0, 0)
@@ -28,6 +29,7 @@ unsafe fn test_dangling_fd(dir_fd: wasi::Fd) {
         );
         wasi::path_remove_directory(dir_fd, "subdir").expect("failed to remove dir 2");
         wasi::path_create_directory(dir_fd, "subdir").expect("failed to create dir 2");
+    }
 }
 
 fn main() {

crates/test-programs/wasi-tests/src/bin/remove_directory_trailing_slashes.rs

@@ -11,11 +11,9 @@ unsafe fn test_remove_directory_trailing_slashes(dir_fd: wasi::Fd) {
 
     wasi::path_create_directory(dir_fd, "dir").expect("creating a directory");
 
-    /* XXX disabled: this fails presently on windows and linux
     // Test that removing it with a trailing slash succeeds.
     wasi::path_remove_directory(dir_fd, "dir/")
         .expect("remove_directory with a trailing slash on a directory should succeed");
-    */
 
     // Create a temporary file.
     create_file(dir_fd, "file");

crates/test-programs/wasi-tests/src/config.rs

@@ -3,6 +3,7 @@ pub struct TestConfig {
     no_dangling_symlinks: bool,
     no_fd_allocate: bool,
     no_rename_dir_to_empty_dir: bool,
+    no_dangling_directory: bool,
 }
 
 enum ErrnoMode {
@@ -23,11 +24,13 @@ impl TestConfig {
         let no_dangling_symlinks = std::env::var("NO_DANGLING_SYMLINKS").is_ok();
         let no_fd_allocate = std::env::var("NO_FD_ALLOCATE").is_ok();
         let no_rename_dir_to_empty_dir = std::env::var("NO_RENAME_DIR_TO_EMPTY_DIR").is_ok();
+        let no_dangling_directory = std::env::var("NO_DANGLING_DIRECTORY").is_ok();
         TestConfig {
             errno_mode,
             no_dangling_symlinks,
             no_fd_allocate,
             no_rename_dir_to_empty_dir,
+            no_dangling_directory,
         }
     }
     pub fn errno_expect_unix(&self) -> bool {
@@ -51,4 +54,7 @@ impl TestConfig {
     pub fn support_rename_dir_to_empty_dir(&self) -> bool {
         !self.no_rename_dir_to_empty_dir
     }
+    pub fn support_dangling_directory(&self) -> bool {
+        !self.no_dangling_directory
+    }
 }