1 files changed, 277 insertions, 0 deletions
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..f171a8c
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,277 @@
+package main
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"testing"
+)
+
+const tmpDir = "../tmp/"
+const plainDir = tmpDir + "plain/"
+const cipherDir = tmpDir + "cipher/"
+
+func mount(extraArgs ...string) {
+	var args []string
+	args = append(args, extraArgs...)
+	args = append(args, cipherDir)
+	args = append(args, plainDir)
+	c := exec.Command("../gocryptfs", args...)
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	err := c.Run()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+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
+}
+
+// This is the entry point for the tests
+func TestMain(m *testing.M) {
+
+	fu := exec.Command("fusermount", "-z", "-u", plainDir)
+	fu.Run()
+
+	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")
+	}
+
+	mount("--zerokey", "--openssl=false")
+	r := m.Run()
+	unmount()
+
+	mount("--zerokey")
+	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()
+}