7e953d7483
When compiled to `GOOS=js`, wasm does not maintain the working directory: it is defined by the host. While not explicitly documented, `os.TestDirFSRootDir` in Go suggests the working directory must be valid to pass (literally the directory holding the file). This adds an experimental CLI flag that gives the initial working directory. This is experimental because while GOOS=js uses this, current WASI compilers will not, as they maintain working directory in code managed by wasi-libc, or as a convention (e.g. in Zig). It is not yet known if wasi-cli will maintain working directory externally or not. Signed-off-by: Adrian Cole <adrian@tetrate.io>
84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package platform
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import (
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"os"
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path "path/filepath"
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"runtime"
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"syscall"
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"testing"
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"github.com/tetratelabs/wazero/internal/testing/require"
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)
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func TestOpenFile(t *testing.T) {
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tmpDir := t.TempDir()
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// from os.TestDirFSPathsValid
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if runtime.GOOS != "windows" {
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t.Run("strange name", func(t *testing.T) {
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f, err := OpenFile(path.Join(tmpDir, `e:xperi\ment.txt`), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
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require.NoError(t, err)
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require.NoError(t, f.Close())
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})
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}
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}
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func TestOpenFile_Errors(t *testing.T) {
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tmpDir := t.TempDir()
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t.Run("not found must be ENOENT", func(t *testing.T) {
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_, err := OpenFile(path.Join(tmpDir, "not-really-exist.txt"), os.O_RDONLY, 0o600)
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require.EqualErrno(t, syscall.ENOENT, err)
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})
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// This is the same as https://github.com/ziglang/zig/blob/d24ebf1d12cf66665b52136a2807f97ff021d78d/lib/std/os/test.zig#L105-L112
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t.Run("try creating on existing file must be EEXIST", func(t *testing.T) {
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filepath := path.Join(tmpDir, "file.txt")
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f, err := OpenFile(filepath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o666)
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defer require.NoError(t, f.Close())
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require.NoError(t, err)
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_, err = OpenFile(filepath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o666)
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require.EqualErrno(t, syscall.EEXIST, err)
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})
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t.Run("writing to a read-only file is EBADF", func(t *testing.T) {
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path := path.Join(tmpDir, "file")
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require.NoError(t, os.WriteFile(path, nil, 0o600))
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f, err := OpenFile(path, os.O_RDONLY, 0)
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defer require.NoError(t, f.Close())
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require.NoError(t, err)
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_, err = f.Write([]byte{1, 2, 3, 4})
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require.EqualErrno(t, syscall.EBADF, UnwrapOSError(err))
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})
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t.Run("writing to a directory is EBADF", func(t *testing.T) {
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path := path.Join(tmpDir, "diragain")
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require.NoError(t, os.Mkdir(path, 0o755))
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f, err := OpenFile(path, os.O_RDONLY, 0)
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defer require.NoError(t, f.Close())
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require.NoError(t, err)
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_, err = f.Write([]byte{1, 2, 3, 4})
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require.EqualErrno(t, syscall.EBADF, UnwrapOSError(err))
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})
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// This is similar to https://github.com/WebAssembly/wasi-testsuite/blob/dc7f8d27be1030cd4788ebdf07d9b57e5d23441e/tests/rust/src/bin/dangling_symlink.rs
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t.Run("dangling symlinks", func(t *testing.T) {
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target := path.Join(tmpDir, "target")
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symlink := path.Join(tmpDir, "dangling_symlink_symlink.cleanup")
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err := os.Symlink(target, symlink)
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require.NoError(t, err)
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_, err = OpenFile(symlink, O_DIRECTORY|O_NOFOLLOW, 0o0666)
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require.EqualErrno(t, syscall.ENOTDIR, err)
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_, err = OpenFile(symlink, O_NOFOLLOW, 0o0666)
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require.EqualErrno(t, syscall.ELOOP, err)
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})
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}
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