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backup_test.go
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backup_test.go
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//go:build windows
// +build windows
package winio
import (
"io"
"os"
"testing"
"golang.org/x/sys/windows"
)
var testFileName string
func TestMain(m *testing.M) {
f, err := os.CreateTemp("", "tmp")
if err != nil {
panic(err)
}
testFileName = f.Name()
f.Close()
defer os.Remove(testFileName)
os.Exit(m.Run())
}
func makeTestFile(makeADS bool) error {
os.Remove(testFileName)
f, err := os.Create(testFileName)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write([]byte("testing 1 2 3\n"))
if err != nil {
return err
}
if makeADS {
a, err := os.Create(testFileName + ":ads.txt")
if err != nil {
return err
}
defer a.Close()
_, err = a.Write([]byte("alternate data stream\n"))
if err != nil {
return err
}
}
return nil
}
func TestBackupRead(t *testing.T) {
err := makeTestFile(true)
if err != nil {
t.Fatal(err)
}
f, err := os.Open(testFileName)
if err != nil {
t.Fatal(err)
}
defer f.Close()
r := NewBackupFileReader(f, false)
defer r.Close()
b, err := io.ReadAll(r)
if err != nil {
t.Fatal(err)
}
if len(b) == 0 {
t.Fatal("no data")
}
}
func TestBackupStreamRead(t *testing.T) {
err := makeTestFile(true)
if err != nil {
t.Fatal(err)
}
f, err := os.Open(testFileName)
if err != nil {
t.Fatal(err)
}
defer f.Close()
r := NewBackupFileReader(f, false)
defer r.Close()
br := NewBackupStreamReader(r)
gotData := false
gotAltData := false
for {
hdr, err := br.Next()
if err == io.EOF { //nolint:errorlint
break
}
if err != nil {
t.Fatal(err)
}
switch hdr.Id {
case BackupData:
if gotData {
t.Fatal("duplicate data")
}
if hdr.Name != "" {
t.Fatalf("unexpected name %s", hdr.Name)
}
b, err := io.ReadAll(br)
if err != nil {
t.Fatal(err)
}
if string(b) != "testing 1 2 3\n" {
t.Fatalf("incorrect data %v", b)
}
gotData = true
case BackupAlternateData:
if gotAltData {
t.Fatal("duplicate alt data")
}
if hdr.Name != ":ads.txt:$DATA" {
t.Fatalf("incorrect name %s", hdr.Name)
}
b, err := io.ReadAll(br)
if err != nil {
t.Fatal(err)
}
if string(b) != "alternate data stream\n" {
t.Fatalf("incorrect data %v", b)
}
gotAltData = true
default:
t.Fatalf("unknown stream ID %d", hdr.Id)
}
}
if !gotData || !gotAltData {
t.Fatal("missing stream")
}
}
func TestBackupStreamWrite(t *testing.T) {
f, err := os.Create(testFileName)
if err != nil {
t.Fatal(err)
}
defer f.Close()
w := NewBackupFileWriter(f, false)
defer w.Close()
data := "testing 1 2 3\n"
altData := "alternate stream\n"
br := NewBackupStreamWriter(w)
err = br.WriteHeader(&BackupHeader{Id: BackupData, Size: int64(len(data))})
if err != nil {
t.Fatal(err)
}
n, err := br.Write([]byte(data))
if err != nil {
t.Fatal(err)
}
if n != len(data) {
t.Fatal("short write")
}
err = br.WriteHeader(&BackupHeader{Id: BackupAlternateData, Size: int64(len(altData)), Name: ":ads.txt:$DATA"})
if err != nil {
t.Fatal(err)
}
n, err = br.Write([]byte(altData))
if err != nil {
t.Fatal(err)
}
if n != len(altData) {
t.Fatal("short write")
}
f.Close()
b, err := os.ReadFile(testFileName)
if err != nil {
t.Fatal(err)
}
if string(b) != data {
t.Fatalf("wrong data %v", b)
}
b, err = os.ReadFile(testFileName + ":ads.txt")
if err != nil {
t.Fatal(err)
}
if string(b) != altData {
t.Fatalf("wrong data %v", b)
}
}
func makeSparseFile() error {
os.Remove(testFileName)
f, err := os.Create(testFileName)
if err != nil {
return err
}
defer f.Close()
err = windows.DeviceIoControl(windows.Handle(f.Fd()), windows.FSCTL_SET_SPARSE, nil, 0, nil, 0, nil, nil)
if err != nil {
return err
}
_, err = f.Write([]byte("testing 1 2 3\n"))
if err != nil {
return err
}
_, err = f.Seek(1000000, 0)
if err != nil {
return err
}
_, err = f.Write([]byte("more data later\n"))
if err != nil {
return err
}
return nil
}
func TestBackupSparseFile(t *testing.T) {
err := makeSparseFile()
if err != nil {
t.Fatal(err)
}
f, err := os.Open(testFileName)
if err != nil {
t.Fatal(err)
}
defer f.Close()
r := NewBackupFileReader(f, false)
defer r.Close()
br := NewBackupStreamReader(r)
for {
hdr, err := br.Next()
if err == io.EOF { //nolint:errorlint
break
}
if err != nil {
t.Fatal(err)
}
t.Log(hdr)
}
}