From 2a9d9bd2148f5772f80f1dfdd794797a5aa34399 Mon Sep 17 00:00:00 2001
From: Edoardo Vacchi <evacchi@users.noreply.github.com>
Date: Mon, 11 Mar 2024 12:08:09 +0800
Subject: [PATCH] chore(deps): bump wazero from 1.2.1 to 1.6.0 (#6290)

Signed-off-by: Edoardo Vacchi <evacchi@users.noreply.github.com>
---
 go.mod                   |  2 +-
 go.sum                   |  4 ++--
 pkg/module/memfs.go      | 29 ++++++++++++++++++++++++++---
 pkg/module/memfs_test.go | 26 ++++++++++++++++++++++++++
 4 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/go.mod b/go.mod
index 539c723bddf5..aeea13fa7d2d 100644
--- a/go.mod
+++ b/go.mod
@@ -99,7 +99,7 @@ require (
 	github.com/stretchr/testify v1.8.4
 	github.com/testcontainers/testcontainers-go v0.28.0
 	github.com/testcontainers/testcontainers-go/modules/localstack v0.26.0
-	github.com/tetratelabs/wazero v1.2.1
+	github.com/tetratelabs/wazero v1.6.0
 	github.com/twitchtv/twirp v8.1.2+incompatible
 	github.com/xeipuuv/gojsonschema v1.2.0
 	github.com/xlab/treeprint v1.2.0
diff --git a/go.sum b/go.sum
index ba486cb50204..6319723f6b29 100644
--- a/go.sum
+++ b/go.sum
@@ -1629,8 +1629,8 @@ github.com/testcontainers/testcontainers-go v0.23.0 h1:ERYTSikX01QczBLPZpqsETTBO
 github.com/testcontainers/testcontainers-go v0.23.0/go.mod h1:3gzuZfb7T9qfcH2pHpV4RLlWrPjeWNQah6XlYQ32c4I=
 github.com/testcontainers/testcontainers-go/modules/localstack v0.26.0 h1:lpL04dHA9mGFBQLFcV+aEEh1Tf4ohXdIGgoj3J0bacM=
 github.com/testcontainers/testcontainers-go/modules/localstack v0.26.0/go.mod h1:1xkZPpkBu6coI7CyVn3DXUBnsVrZ+fd/Cc8lx6zk2mk=
-github.com/tetratelabs/wazero v1.2.1 h1:J4X2hrGzJvt+wqltuvcSjHQ7ujQxA9gb6PeMs4qlUWs=
-github.com/tetratelabs/wazero v1.2.1/go.mod h1:wYx2gNRg8/WihJfSDxA1TIL8H+GkfLYm+bIfbblu9VQ=
+github.com/tetratelabs/wazero v1.6.0 h1:z0H1iikCdP8t+q341xqepY4EWvHEw8Es7tlqiVzlP3g=
+github.com/tetratelabs/wazero v1.6.0/go.mod h1:0U0G41+ochRKoPKCJlh0jMg1CHkyfK8kDqiirMmKY8A=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/twitchtv/twirp v8.1.2+incompatible h1:0O6TfzZW09ZP5r+ORA90XQEE3PTgA6C7MBbl2KxvVgE=
diff --git a/pkg/module/memfs.go b/pkg/module/memfs.go
index 0a3b37452f91..d407fd21e88c 100644
--- a/pkg/module/memfs.go
+++ b/pkg/module/memfs.go
@@ -4,6 +4,7 @@ import (
 	"io"
 	"io/fs"
 	"path/filepath"
+	"time"
 
 	"golang.org/x/xerrors"
 
@@ -19,10 +20,14 @@ type memFS struct {
 
 // Open implements fs.FS.
 func (m *memFS) Open(name string) (fs.File, error) {
-	if m.current == nil {
-		return nil, fs.ErrNotExist
+	if m.current != nil {
+		return m.current.Open(name)
 	}
-	return m.current.Open(name)
+	// memFS is always a directory.
+	if name == "." {
+		return &emptyDir{}, nil
+	}
+	return nil, fs.ErrNotExist
 }
 
 // initialize changes the underlying memory file system with the given file path and contents.
@@ -46,3 +51,21 @@ func (m *memFS) initialize(filePath string, content xio.ReadSeekerAt) error {
 	m.current = mfs
 	return nil
 }
+
+type emptyDir struct{}
+
+func (emptyDir) Close() (err error)         { return }
+func (emptyDir) Stat() (fs.FileInfo, error) { return fakeRootDirInfo{}, nil }
+func (emptyDir) Read([]byte) (int, error) {
+	return 0, &fs.PathError{Op: "read", Path: "/", Err: fs.ErrInvalid}
+}
+
+type fakeRootDirInfo struct{}
+
+func (fakeRootDirInfo) Name() string                            { return "/" }
+func (fakeRootDirInfo) Size() int64                             { return 0 }
+func (fakeRootDirInfo) Mode() fs.FileMode                       { return fs.ModeDir | 0o500 }
+func (fakeRootDirInfo) ModTime() time.Time                      { return time.Unix(0, 0) }
+func (fakeRootDirInfo) IsDir() bool                             { return true }
+func (fakeRootDirInfo) Sys() interface{}                        { return nil }
+func (emptyDir) ReadDir(int) (dirents []fs.DirEntry, err error) { return }
diff --git a/pkg/module/memfs_test.go b/pkg/module/memfs_test.go
index 584efa1d7c62..fe60004cb783 100644
--- a/pkg/module/memfs_test.go
+++ b/pkg/module/memfs_test.go
@@ -1,7 +1,9 @@
 package module
 
 import (
+	"errors"
 	"io"
+	"io/fs"
 	"os"
 	"strings"
 	"testing"
@@ -31,3 +33,27 @@ func TestMemFS(t *testing.T) {
 		require.ErrorIs(t, err, os.ErrNotExist)
 	})
 }
+
+func TestMemFS_NilIsDirectory(t *testing.T) {
+	// Wasm module initializes before an FS has been
+	// associated to this memFS. We handle nil
+	// so that the guest knows that the mount will map
+	// to a directory in the future.
+	m := &memFS{}
+	require.Nil(t, m.current)
+
+	f, err := m.Open(".")
+	require.NoError(t, err)
+
+	t.Run("stat is dir", func(t *testing.T) {
+		st, err := f.Stat()
+		require.NoError(t, err)
+		require.True(t, st.IsDir())
+	})
+
+	t.Run("read invalid", func(t *testing.T) {
+		buf := make([]byte, 4)
+		_, err = f.Read(buf)
+		require.True(t, errors.Is(err, fs.ErrInvalid))
+	})
+}