Implement os.RemoveAll()

TODO: enable test on windows once Readdir is implemented there

src/os/read_test.go

@@ -0,0 +1,102 @@
+//go:build !baremetal && !js && !wasi
+// +build !baremetal,!js,!wasi
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os_test
+
+import (
+	"bytes"
+	. "os"
+	"path/filepath"
+	"testing"
+)
+
+func checkNamedSize(t *testing.T, path string, size int64) {
+	// TODO: this statement fails on wasi, possibly it objects to reading Stat on a symlink
+	dir, err := Stat(path)
+	if err != nil {
+		t.Fatalf("Stat %q (looking for size %d): %s", path, size, err)
+		return
+	}
+	if dir.Size() != size {
+		t.Errorf("Stat %q: size %d want %d", path, dir.Size(), size)
+	}
+}
+
+func TestReadFile(t *testing.T) {
+	filename := "rumpelstilzchen"
+	contents, err := ReadFile(filename)
+	if err == nil {
+		t.Fatalf("ReadFile %s: error expected, none found", filename)
+	}
+
+	filename = "read_test.go"
+	contents, err = ReadFile(filename)
+	if err != nil {
+		t.Fatalf("ReadFile %s: %v", filename, err)
+	}
+
+	checkNamedSize(t, filename, int64(len(contents)))
+}
+
+func TestWriteFile(t *testing.T) {
+	f, err := CreateTemp("", "ioutil-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	defer Remove(f.Name())
+
+	msg := "Programming today is a race between software engineers striving to " +
+		"build bigger and better idiot-proof programs, and the Universe trying " +
+		"to produce bigger and better idiots. So far, the Universe is winning."
+
+	if err := WriteFile(f.Name(), []byte(msg), 0644); err != nil {
+		t.Fatalf("WriteFile %s: %v", f.Name(), err)
+	}
+
+	data, err := ReadFile(f.Name())
+	if err != nil {
+		t.Fatalf("ReadFile %s: %v", f.Name(), err)
+	}
+
+	if string(data) != msg {
+		t.Fatalf("ReadFile: wrong data:\nhave %q\nwant %q", string(data), msg)
+	}
+}
+
+func TestReadOnlyWriteFile(t *testing.T) {
+	// TODO: also skip on wasi, where file permissions are ignored
+	if Getuid() == 0 {
+		t.Skipf("Root can write to read-only files anyway, so skip the read-only test.")
+	}
+
+	// We don't want to use CreateTemp directly, since that opens a file for us as 0600.
+	tempDir, err := MkdirTemp("", t.Name())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer RemoveAll(tempDir)
+	filename := filepath.Join(tempDir, "blurp.txt")
+
+	shmorp := []byte("shmorp")
+	florp := []byte("florp")
+	err = WriteFile(filename, shmorp, 0444)
+	if err != nil {
+		t.Fatalf("WriteFile %s: %v", filename, err)
+	}
+	err = WriteFile(filename, florp, 0444)
+	if err == nil {
+		t.Fatalf("Expected an error when writing to read-only file %s", filename)
+	}
+	got, err := ReadFile(filename)
+	if err != nil {
+		t.Fatalf("ReadFile %s: %v", filename, err)
+	}
+	if !bytes.Equal(got, shmorp) {
+		t.Fatalf("want %s, got %s", shmorp, got)
+	}
+}