package sysfs import ( "os" path "path/filepath" "runtime" "testing" "github.com/tetratelabs/wazero/experimental/sys" "github.com/tetratelabs/wazero/internal/testing/require" ) func TestOpenFile(t *testing.T) { tmpDir := t.TempDir() t.Run("directory with a trailing slash", func(t *testing.T) { path := path.Join(tmpDir, "dir", "nested") err := os.MkdirAll(path, 0o700) require.NoError(t, err) f, errno := OpenFile(path+"/", sys.O_RDONLY, 0) require.EqualErrno(t, 0, errno) require.NoError(t, f.Close()) }) // from os.TestDirFSPathsValid if runtime.GOOS != "windows" { t.Run("strange name", func(t *testing.T) { f, errno := OpenFile(path.Join(tmpDir, `e:xperi\ment.txt`), sys.O_WRONLY|sys.O_CREAT|sys.O_TRUNC, 0o600) require.EqualErrno(t, 0, errno) require.NoError(t, f.Close()) }) } } func TestOpenFile_Errors(t *testing.T) { tmpDir := t.TempDir() t.Run("file with a trailing slash is ENOTDIR", func(t *testing.T) { nested := path.Join(tmpDir, "dir", "nested") err := os.MkdirAll(nested, 0o700) require.NoError(t, err) nestedFile := path.Join(nested, "file") err = os.WriteFile(nestedFile, nil, 0o700) require.NoError(t, err) _, errno := OpenFile(nestedFile+"/", sys.O_RDONLY, 0) require.EqualErrno(t, sys.ENOTDIR, errno) }) t.Run("not found must be ENOENT", func(t *testing.T) { _, errno := OpenFile(path.Join(tmpDir, "not-really-exist.txt"), sys.O_RDONLY, 0o600) require.EqualErrno(t, sys.ENOENT, errno) }) // This is the same as https://github.com/ziglang/zig/blob/d24ebf1d12cf66665b52136a2807f97ff021d78d/lib/std/os/test.zig#L105-L112 t.Run("try creating on existing file must be EEXIST", func(t *testing.T) { filepath := path.Join(tmpDir, "file.txt") f, errno := OpenFile(filepath, sys.O_RDWR|sys.O_CREAT|sys.O_EXCL, 0o666) require.EqualErrno(t, 0, errno) defer f.Close() _, err := OpenFile(filepath, sys.O_RDWR|sys.O_CREAT|sys.O_EXCL, 0o666) require.EqualErrno(t, sys.EEXIST, err) }) t.Run("writing to a read-only file is EBADF", func(t *testing.T) { path := path.Join(tmpDir, "file") require.NoError(t, os.WriteFile(path, nil, 0o600)) f := requireOpenFile(t, path, sys.O_RDONLY, 0) defer f.Close() _, errno := f.Write([]byte{1, 2, 3, 4}) require.EqualErrno(t, sys.EBADF, errno) }) t.Run("writing to a directory is EISDIR", func(t *testing.T) { path := path.Join(tmpDir, "diragain") require.NoError(t, os.Mkdir(path, 0o755)) f := requireOpenFile(t, path, sys.O_RDONLY, 0) defer f.Close() _, errno := f.Write([]byte{1, 2, 3, 4}) require.EqualErrno(t, sys.EISDIR, errno) }) // This is similar to https://github.com/WebAssembly/wasi-testsuite/blob/dc7f8d27be1030cd4788ebdf07d9b57e5d23441e/tests/rust/src/bin/dangling_symlink.rs t.Run("dangling symlinks", func(t *testing.T) { target := path.Join(tmpDir, "target") symlink := path.Join(tmpDir, "dangling_symlink_symlink.cleanup") err := os.Symlink(target, symlink) require.NoError(t, err) _, errno := OpenFile(symlink, sys.O_DIRECTORY|sys.O_NOFOLLOW, 0o0666) require.EqualErrno(t, sys.ENOTDIR, errno) _, errno = OpenFile(symlink, sys.O_NOFOLLOW, 0o0666) require.EqualErrno(t, sys.ELOOP, errno) }) t.Run("opening a directory writeable is EISDIR", func(t *testing.T) { _, errno := OpenFile(tmpDir, sys.O_DIRECTORY|sys.O_WRONLY, 0o0666) require.EqualErrno(t, sys.EISDIR, errno) _, errno = OpenFile(tmpDir, sys.O_DIRECTORY|sys.O_WRONLY, 0o0666) require.EqualErrno(t, sys.EISDIR, errno) }) }