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package main
import (
"bytes"
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"testing"
"time"
)
const tmpDir = "main_test_tmp/"
const plainDir = tmpDir + "plain/"
const cipherDir = tmpDir + "cipher/"
func unmount() error {
fu := exec.Command("fusermount", "-z", "-u", plainDir)
fu.Stdout = os.Stdout
fu.Stderr = os.Stderr
return fu.Run()
}
func md5fn(filename string) string {
buf, err := ioutil.ReadFile(filename)
if err != nil {
fmt.Printf("ReadFile: %v\n", err)
return ""
}
rawHash := md5.Sum(buf)
hash := hex.EncodeToString(rawHash[:])
return hash
}
func TestMain(m *testing.M) {
unmount()
os.RemoveAll(tmpDir)
err := os.MkdirAll(plainDir, 0777)
if err != nil {
panic("Could not create plainDir")
}
err = os.MkdirAll(cipherDir, 0777)
if err != nil {
panic("Could not create cipherDir")
}
//c := exec.Command("./gocryptfs", "--zerokey", "--cpuprofile", "/tmp/gcfs.cpu", cipherDir, plainDir)
c := exec.Command("./gocryptfs", "--zerokey", cipherDir, plainDir)
c.Stdout = os.Stdout
c.Stderr = os.Stderr
go c.Run()
time.Sleep(3 * time.Second)
r := m.Run()
unmount()
os.Exit(r)
}
func testWriteN(t *testing.T, fn string, n int) string {
file, err := os.Create(plainDir + fn)
if err != nil {
t.FailNow()
}
d := make([]byte, n)
written, err := file.Write(d)
if err != nil || written != len(d) {
fmt.Printf("err=\"%s\", written=%d\n", err, written)
t.Fail()
}
file.Close()
bin := md5.Sum(d)
hashWant := hex.EncodeToString(bin[:])
hashActual := md5fn(plainDir + fn)
if hashActual != hashWant {
fmt.Printf("hashWant=%s hashActual=%s\n", hashWant, hashActual)
t.Fail()
}
return hashActual
}
func TestWrite10(t *testing.T) {
testWriteN(t, "10", 10)
}
func TestWrite100(t *testing.T) {
testWriteN(t, "100", 100)
}
func TestWrite1M(t *testing.T) {
testWriteN(t, "1M", 1024*1024)
}
func TestWrite1Mx100(t *testing.T) {
hashWant := testWriteN(t, "1Mx100", 1024*1024)
// Read and check 100 times to catch race conditions
var i int
for i = 0; i < 100; i++ {
hashActual := md5fn(plainDir + "1M")
if hashActual != hashWant {
fmt.Printf("Read corruption in loop # %d\n", i)
t.FailNow()
} else {
//fmt.Print(".")
}
}
}
func TestTruncate(t *testing.T) {
fn := plainDir + "truncate"
file, err := os.Create(fn)
if err != nil {
t.FailNow()
}
// Grow to two blocks
file.Truncate(7000)
if md5fn(fn) != "95d4ec7038e3e4fdbd5f15c34c3f0b34" {
t.Errorf("Fail 7000")
}
// Shrink - needs RMW
file.Truncate(6999)
if md5fn(fn) != "35fd15873ec6c35380064a41b9b9683b" {
t.Errorf("Fail 6999")
}
// Shrink to one partial block
file.Truncate(465)
if md5fn(fn) != "a1534d6e98a6b21386456a8f66c55260" {
t.Errorf("Fail 465")
}
// Grow to exactly one block
file.Truncate(4096)
if md5fn(fn) != "620f0b67a91f7f74151bc5be745b7110" {
t.Errorf("Fail 4096")
}
}
func TestAppend(t *testing.T) {
fn := plainDir + "append"
file, err := os.Create(fn)
if err != nil {
t.FailNow()
}
data := []byte("testdata123456789") // length 17
var buf bytes.Buffer
var hashWant string
for i := 0; i <= 500; i++ {
file.Write(data)
buf.Write(data)
bin := md5.Sum(buf.Bytes())
hashWant = hex.EncodeToString(bin[:])
hashActual := md5fn(fn)
if hashWant != hashActual {
t.FailNow()
}
}
// Overwrite with the same data
// Hash must stay the same
file.Seek(0, 0)
for i := 0; i <= 500; i++ {
file.Write(data)
hashActual := md5fn(fn)
if hashWant != hashActual {
t.FailNow()
}
}
}
// Create a file with holes by writing to offset 0 (block #0) and
// offset 4096 (block #1).
func TestFileHoles(t *testing.T) {
fn := plainDir + "fileholes"
file, err := os.Create(fn)
if err != nil {
t.Errorf("file create failed")
}
foo := []byte("foo")
file.Write(foo)
file.WriteAt(foo, 4096)
_, err = ioutil.ReadFile(fn)
if err != nil {
t.Error(err)
}
}
func BenchmarkStreamWrite(t *testing.B) {
buf := make([]byte, 1024*1024)
t.SetBytes(int64(len(buf)))
file, err := os.Create(plainDir + "BenchmarkWrite")
if err != nil {
t.FailNow()
}
t.ResetTimer()
var i int
for i = 0; i < t.N; i++ {
written, err := file.Write(buf)
if err != nil {
fmt.Printf("err=\"%s\", written=%d\n", err.Error(), written)
t.FailNow()
}
}
file.Close()
}
func BenchmarkStreamRead(t *testing.B) {
buf := make([]byte, 1024*1024)
t.SetBytes(int64(len(buf)))
fn := plainDir + "BenchmarkWrite"
fi, _ := os.Stat(fn)
mb := int(fi.Size() / 1024 / 1024)
if t.N > mb {
// Grow file so we can satisfy the test
fmt.Printf("Growing file to %d MB... ", t.N)
f2, err := os.OpenFile(fn, os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
fmt.Println(err)
t.FailNow()
}
for h := 0; h < t.N-mb; h++ {
_, err = f2.Write(buf)
if err != nil {
fmt.Println(err)
t.FailNow()
}
}
f2.Close()
fmt.Printf("done\n")
}
file, err := os.Open(plainDir + "BenchmarkWrite")
if err != nil {
t.FailNow()
}
t.ResetTimer()
var i int
for i = 0; i < t.N; i++ {
_, err := file.Read(buf)
if err == io.EOF {
fmt.Printf("Test file too small\n")
t.SkipNow()
} else if err != nil {
fmt.Println(err)
t.FailNow()
}
}
file.Close()
}
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