105cdcdef7
This rewrites compositeFS to syscallfs.FS following wasi-sdk preopen rules. Notably, this allows use of read-only mounts now. For example, ```bash $ GOOS=js GOARCH=wasm bin/go test -c -o template.wasm text/template $ wazero run -mount=src/text/template:/ -mount=/tmp:/tmp template.wasm -test.v === RUN TestExecute --- PASS: TestExecute (0.07s) --snip-- ``` This is the first step to native WASI handling of multiple pre-opens. After this change, it is still the case that there's only one pre-open FD visible to wasm. A later change will make it possible for WASI to see multiple pre-opens while `GOOS=js` which doesn't use preopens, remains on a rootFS. A future PR may need to add a CLI flag to disable escaping directories, (e.g. make ../.. EINVAL), similar to `fs.FS` in Go. The simplest way to allow this is to use a host-side RootFS even in WASI, and wrap that with a `syscallfs` filename filter. Signed-off-by: Adrian Cole <adrian@tetrate.io>
33 lines
630 B
Go
33 lines
630 B
Go
package testfs
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import (
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"io/fs"
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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 TestFS(t *testing.T) {
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testFS := &FS{}
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t.Run("path not found", func(t *testing.T) {
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f, err := testFS.Open("foo.txt")
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require.Nil(t, f)
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require.EqualError(t, err, "open foo.txt: file does not exist")
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})
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(*testFS)["foo.txt"] = &File{}
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f, err := testFS.Open("foo.txt")
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require.NoError(t, err)
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require.Equal(t, f, &File{})
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}
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func TestFile(t *testing.T) {
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f := &File{CloseErr: fs.ErrClosed}
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t.Run("returns close error", func(t *testing.T) {
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err := f.Close()
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require.Equal(t, fs.ErrClosed, err)
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})
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}
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