package tarsum
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/md5"
"crypto/rand"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type testLayer struct {
filename string
options *sizedOptions
jsonfile string
gzip bool
tarsum string
version Version
hash THash
}
var testLayers = []testLayer{
{
filename: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar",
jsonfile: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/json",
version: Version0,
tarsum: "tarsum+sha256:4095cc12fa5fdb1ab2760377e1cd0c4ecdd3e61b4f9b82319d96fcea6c9a41c6"},
{
filename: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar",
jsonfile: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/json",
version: VersionDev,
tarsum: "tarsum.dev+sha256:db56e35eec6ce65ba1588c20ba6b1ea23743b59e81fb6b7f358ccbde5580345c"},
{
filename: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar",
jsonfile: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/json",
gzip: true,
tarsum: "tarsum+sha256:4095cc12fa5fdb1ab2760377e1cd0c4ecdd3e61b4f9b82319d96fcea6c9a41c6"},
{
// Tests existing version of TarSum when xattrs are present
filename: "testdata/xattr/layer.tar",
jsonfile: "testdata/xattr/json",
version: Version0,
tarsum: "tarsum+sha256:07e304a8dbcb215b37649fde1a699f8aeea47e60815707f1cdf4d55d25ff6ab4"},
{
// Tests next version of TarSum when xattrs are present
filename: "testdata/xattr/layer.tar",
jsonfile: "testdata/xattr/json",
version: VersionDev,
tarsum: "tarsum.dev+sha256:6c58917892d77b3b357b0f9ad1e28e1f4ae4de3a8006bd3beb8beda214d8fd16"},
{
filename: "testdata/511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158/layer.tar",
jsonfile: "testdata/511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158/json",
tarsum: "tarsum+sha256:c66bd5ec9f87b8f4c6135ca37684618f486a3dd1d113b138d0a177bfa39c2571"},
{
options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
tarsum: "tarsum+sha256:8bf12d7e67c51ee2e8306cba569398b1b9f419969521a12ffb9d8875e8836738"},
{
// this tar has two files with the same path
filename: "testdata/collision/collision-0.tar",
tarsum: "tarsum+sha256:08653904a68d3ab5c59e65ef58c49c1581caa3c34744f8d354b3f575ea04424a"},
{
// this tar has the same two files (with the same path), but reversed order. ensuring is has different hash than above
filename: "testdata/collision/collision-1.tar",
tarsum: "tarsum+sha256:b51c13fbefe158b5ce420d2b930eef54c5cd55c50a2ee4abdddea8fa9f081e0d"},
{
// this tar has newer of collider-0.tar, ensuring is has different hash
filename: "testdata/collision/collision-2.tar",
tarsum: "tarsum+sha256:381547080919bb82691e995508ae20ed33ce0f6948d41cafbeb70ce20c73ee8e"},
{
// this tar has newer of collider-1.tar, ensuring is has different hash
filename: "testdata/collision/collision-3.tar",
tarsum: "tarsum+sha256:f886e431c08143164a676805205979cd8fa535dfcef714db5515650eea5a7c0f"},
{
options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
tarsum: "tarsum+md5:0d7529ec7a8360155b48134b8e599f53",
hash: md5THash,
},
{
options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
tarsum: "tarsum+sha1:f1fee39c5925807ff75ef1925e7a23be444ba4df",
hash: sha1Hash,
},
{
options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
tarsum: "tarsum+sha224:6319390c0b061d639085d8748b14cd55f697cf9313805218b21cf61c",
hash: sha224Hash,
},
{
options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
tarsum: "tarsum+sha384:a578ce3ce29a2ae03b8ed7c26f47d0f75b4fc849557c62454be4b5ffd66ba021e713b48ce71e947b43aab57afd5a7636",
hash: sha384Hash,
},
{
options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
tarsum: "tarsum+sha512:e9bfb90ca5a4dfc93c46ee061a5cf9837de6d2fdf82544d6460d3147290aecfabf7b5e415b9b6e72db9b8941f149d5d69fb17a394cbfaf2eac523bd9eae21855",
hash: sha512Hash,
},
}
type sizedOptions struct {
num int64
size int64
isRand bool
realFile bool
}
// make a tar:
// * num is the number of files the tar should have
// * size is the bytes per file
// * isRand is whether the contents of the files should be a random chunk (otherwise it's all zeros)
// * realFile will write to a TempFile, instead of an in memory buffer
func sizedTar(opts sizedOptions) io.Reader {
var (
fh io.ReadWriter
err error
)
if opts.realFile {
fh, err = ioutil.TempFile("", "tarsum")
if err != nil {
return nil
}
} else {
fh = bytes.NewBuffer([]byte{})
}
tarW := tar.NewWriter(fh)
defer tarW.Close()
for i := int64(0); i < opts.num; i++ {
err := tarW.WriteHeader(&tar.Header{
Name: fmt.Sprintf("/testdata%d", i),
Mode: 0755,
Uid: 0,
Gid: 0,
Size: opts.size,
})
if err != nil {
return nil
}
var rBuf []byte
if opts.isRand {
rBuf = make([]byte, 8)
_, err = rand.Read(rBuf)
if err != nil {
return nil
}
} else {
rBuf = []byte{0, 0, 0, 0, 0, 0, 0, 0}
}
for i := int64(0); i < opts.size/int64(8); i++ {
tarW.Write(rBuf)
}
}
return fh
}
func emptyTarSum(gzip bool) (TarSum, error) {
reader, writer := io.Pipe()
tarWriter := tar.NewWriter(writer)
// Immediately close tarWriter and write-end of the
// Pipe in a separate goroutine so we don't block.
go func() {
tarWriter.Close()
writer.Close()
}()
return NewTarSum(reader, !gzip, Version0)
}
// Test errors on NewTarsumForLabel
func TestNewTarSumForLabelInvalid(t *testing.T) {
reader := strings.NewReader("")
if _, err := NewTarSumForLabel(reader, true, "invalidlabel"); err == nil {
t.Fatalf("Expected an error, got nothing.")
}
if _, err := NewTarSumForLabel(reader, true, "invalid+sha256"); err == nil {
t.Fatalf("Expected an error, got nothing.")
}
if _, err := NewTarSumForLabel(reader, true, "tarsum.v1+invalid"); err == nil {
t.Fatalf("Expected an error, got nothing.")
}
}
func TestNewTarSumForLabel(t *testing.T) {
layer := testLayers[0]
reader, err := os.Open(layer.filename)
if err != nil {
t.Fatal(err)
}
defer reader.Close()
label := strings.Split(layer.tarsum, ":")[0]
ts, err := NewTarSumForLabel(reader, false, label)
if err != nil {
t.Fatal(err)
}
// Make sure it actually worked by reading a little bit of it
nbByteToRead := 8 * 1024
dBuf := make([]byte, nbByteToRead)
_, err = ts.Read(dBuf)
if err != nil {
t.Errorf("failed to read %vKB from %s: %s", nbByteToRead, layer.filename, err)
}
}
// TestEmptyTar tests that tarsum does not fail to read an empty tar
// and correctly returns the hex digest of an empty hash.
func TestEmptyTar(t *testing.T) {
// Test without gzip.
ts, err := emptyTarSum(false)
require.NoError(t, err)
zeroBlock := make([]byte, 1024)
buf := new(bytes.Buffer)
n, err := io.Copy(buf, ts)
require.NoError(t, err)
if n != int64(len(zeroBlock)) || !bytes.Equal(buf.Bytes(), zeroBlock) {
t.Fatalf("tarSum did not write the correct number of zeroed bytes: %d", n)
}
expectedSum := ts.Version().String() + "+sha256:" + hex.EncodeToString(sha256.New().Sum(nil))
resultSum := ts.Sum(nil)
if resultSum != expectedSum {
t.Fatalf("expected [%s] but got [%s]", expectedSum, resultSum)
}
// Test with gzip.
ts, err = emptyTarSum(true)
require.NoError(t, err)
buf.Reset()
_, err = io.Copy(buf, ts)
require.NoError(t, err)
bufgz := new(bytes.Buffer)
gz := gzip.NewWriter(bufgz)
n, err = io.Copy(gz, bytes.NewBuffer(zeroBlock))
require.NoError(t, err)
gz.Close()
gzBytes := bufgz.Bytes()
if n != int64(len(zeroBlock)) || !bytes.Equal(buf.Bytes(), gzBytes) {
t.Fatalf("tarSum did not write the correct number of gzipped-zeroed bytes: %d", n)
}
resultSum = ts.Sum(nil)
if resultSum != expectedSum {
t.Fatalf("expected [%s] but got [%s]", expectedSum, resultSum)
}
// Test without ever actually writing anything.
if ts, err = NewTarSum(bytes.NewReader([]byte{}), true, Version0); err != nil {
t.Fatal(err)
}
resultSum = ts.Sum(nil)
assert.Equal(t, expectedSum, resultSum)
}
var (
md5THash = NewTHash("md5", md5.New)
sha1Hash = NewTHash("sha1", sha1.New)
sha224Hash = NewTHash("sha224", sha256.New224)
sha384Hash = NewTHash("sha384", sha512.New384)
sha512Hash = NewTHash("sha512", sha512.New)
)
// Test all the build-in read size : buf8K, buf16K, buf32K and more
func TestTarSumsReadSize(t *testing.T) {
// Test always on the same layer (that is big enough)
layer := testLayers[0]
for i := 0; i < 5; i++ {
reader, err := os.Open(layer.filename)
if err != nil {
t.Fatal(err)
}
defer reader.Close()
ts, err := NewTarSum(reader, false, layer.version)
if err != nil {
t.Fatal(err)
}
// Read and discard bytes so that it populates sums
nbByteToRead := (i + 1) * 8 * 1024
dBuf := make([]byte, nbByteToRead)
_, err = ts.Read(dBuf)
if err != nil {
t.Errorf("failed to read %vKB from %s: %s", nbByteToRead, layer.filename, err)
continue
}
}
}
func TestTarSums(t *testing.T) {
for _, layer := range testLayers {
var (
fh io.Reader
err error
)
if len(layer.filename) > 0 {
fh, err = os.Open(layer.filename)
if err != nil {
t.Errorf("failed to open %s: %s", layer.filename, err)
continue
}
} else if layer.options != nil {
fh = sizedTar(*layer.options)
} else {
// What else is there to test?
t.Errorf("what to do with %#v", layer)
continue
}
if file, ok := fh.(*os.File); ok {
defer file.Close()
}
var ts TarSum
if layer.hash == nil {
// double negatives!
ts, err = NewTarSum(fh, !layer.gzip, layer.version)
} else {
ts, err = NewTarSumHash(fh, !layer.gzip, layer.version, layer.hash)
}
if err != nil {
t.Errorf("%q :: %q", err, layer.filename)
continue
}
// Read variable number of bytes to test dynamic buffer
dBuf := make([]byte, 1)
_, err = ts.Read(dBuf)
if err != nil {
t.Errorf("failed to read 1B from %s: %s", layer.filename, err)
continue
}
dBuf = make([]byte, 16*1024)
_, err = ts.Read(dBuf)
if err != nil {
t.Errorf("failed to read 16KB from %s: %s", layer.filename, err)
continue
}
// Read and discard remaining bytes
_, err = io.Copy(ioutil.Discard, ts)
if err != nil {
t.Errorf("failed to copy from %s: %s", layer.filename, err)
continue
}
var gotSum string
if len(layer.jsonfile) > 0 {
jfh, err := os.Open(layer.jsonfile)
if err != nil {
t.Errorf("failed to open %s: %s", layer.jsonfile, err)
continue
}
defer jfh.Close()
buf, err := ioutil.ReadAll(jfh)
if err != nil {
t.Errorf("failed to readAll %s: %s", layer.jsonfile, err)
continue
}
gotSum = ts.Sum(buf)
} else {
gotSum = ts.Sum(nil)
}
if layer.tarsum != gotSum {
t.Errorf("expecting [%s], but got [%s]", layer.tarsum, gotSum)
}
var expectedHashName string
if layer.hash != nil {
expectedHashName = layer.hash.Name()
} else {
expectedHashName = DefaultTHash.Name()
}
if expectedHashName != ts.Hash().Name() {
t.Errorf("expecting hash [%v], but got [%s]", expectedHashName, ts.Hash().Name())
}
}
}
func TestIteration(t *testing.T) {
headerTests := []struct {
expectedSum string // TODO(vbatts) it would be nice to get individual sums of each
version Version
hdr *tar.Header
data []byte
}{
{
"tarsum+sha256:626c4a2e9a467d65c33ae81f7f3dedd4de8ccaee72af73223c4bc4718cbc7bbd",
Version0,
&tar.Header{
Name: "file.txt",
Size: 0,
Typeflag: tar.TypeReg,
Devminor: 0,
Devmajor: 0,
},
[]byte(""),
},
{
"tarsum.dev+sha256:6ffd43a1573a9913325b4918e124ee982a99c0f3cba90fc032a65f5e20bdd465",
VersionDev,
&tar.Header{
Name: "file.txt",
Size: 0,
Typeflag: tar.TypeReg,
Devminor: 0,
Devmajor: 0,
},
[]byte(""),
},
{
"tarsum.dev+sha256:b38166c059e11fb77bef30bf16fba7584446e80fcc156ff46d47e36c5305d8ef",
VersionDev,
&tar.Header{
Name: "another.txt",
Uid: 1000,
Gid: 1000,
Uname: "slartibartfast",
Gname: "users",
Size: 4,
Typeflag: tar.TypeReg,
Devminor: 0,
Devmajor: 0,
},
[]byte("test"),
},
{
"tarsum.dev+sha256:4cc2e71ac5d31833ab2be9b4f7842a14ce595ec96a37af4ed08f87bc374228cd",
VersionDev,
&tar.Header{
Name: "xattrs.txt",
Uid: 1000,
Gid: 1000,
Uname: "slartibartfast",
Gname: "users",
Size: 4,
Typeflag: tar.TypeReg,
Xattrs: map[string]string{
"user.key1": "value1",
"user.key2": "value2",
},
},
[]byte("test"),
},
{
"tarsum.dev+sha256:65f4284fa32c0d4112dd93c3637697805866415b570587e4fd266af241503760",
VersionDev,
&tar.Header{
Name: "xattrs.txt",
Uid: 1000,
Gid: 1000,
Uname: "slartibartfast",
Gname: "users",
Size: 4,
Typeflag: tar.TypeReg,
Xattrs: map[string]string{
"user.KEY1": "value1", // adding different case to ensure different sum
"user.key2": "value2",
},
},
[]byte("test"),
},
{
"tarsum+sha256:c12bb6f1303a9ddbf4576c52da74973c00d14c109bcfa76b708d5da1154a07fa",
Version0,
&tar.Header{
Name: "xattrs.txt",
Uid: 1000,
Gid: 1000,
Uname: "slartibartfast",
Gname: "users",
Size: 4,
Typeflag: tar.TypeReg,
Xattrs: map[string]string{
"user.NOT": "CALCULATED",
},
},
[]byte("test"),
},
}
for _, htest := range headerTests {
s, err := renderSumForHeader(htest.version, htest.hdr, htest.data)
if err != nil {
t.Fatal(err)
}
if s != htest.expectedSum {
t.Errorf("expected sum: %q, got: %q", htest.expectedSum, s)
}
}
}
func renderSumForHeader(v Version, h *tar.Header, data []byte) (string, error) {
buf := bytes.NewBuffer(nil)
// first build our test tar
tw := tar.NewWriter(buf)
if err := tw.WriteHeader(h); err != nil {
return "", err
}
if _, err := tw.Write(data); err != nil {
return "", err
}
tw.Close()
ts, err := NewTarSum(buf, true, v)
if err != nil {
return "", err
}
tr := tar.NewReader(ts)
for {
hdr, err := tr.Next()
if hdr == nil || err == io.EOF {
// Signals the end of the archive.
break
}
if err != nil {
return "", err
}
if _, err = io.Copy(ioutil.Discard, tr); err != nil {
return "", err
}
}
return ts.Sum(nil), nil
}
func Benchmark9kTar(b *testing.B) {
buf := bytes.NewBuffer([]byte{})
fh, err := os.Open("testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar")
if err != nil {
b.Error(err)
return
}
defer fh.Close()
n, err := io.Copy(buf, fh)
if err != nil {
b.Error(err)
return
}
reader := bytes.NewReader(buf.Bytes())
b.SetBytes(n)
b.ResetTimer()
for i := 0; i < b.N; i++ {
reader.Seek(0, 0)
ts, err := NewTarSum(reader, true, Version0)
if err != nil {
b.Error(err)
return
}
io.Copy(ioutil.Discard, ts)
ts.Sum(nil)
}
}
func Benchmark9kTarGzip(b *testing.B) {
buf := bytes.NewBuffer([]byte{})
fh, err := os.Open("testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar")
if err != nil {
b.Error(err)
return
}
defer fh.Close()
n, err := io.Copy(buf, fh)
if err != nil {
b.Error(err)
return
}
reader := bytes.NewReader(buf.Bytes())
b.SetBytes(n)
b.ResetTimer()
for i := 0; i < b.N; i++ {
reader.Seek(0, 0)
ts, err := NewTarSum(reader, false, Version0)
if err != nil {
b.Error(err)
return
}
io.Copy(ioutil.Discard, ts)
ts.Sum(nil)
}
}
// this is a single big file in the tar archive
func Benchmark1mbSingleFileTar(b *testing.B) {
benchmarkTar(b, sizedOptions{1, 1024 * 1024, true, true}, false)
}
// this is a single big file in the tar archive
func Benchmark1mbSingleFileTarGzip(b *testing.B) {
benchmarkTar(b, sizedOptions{1, 1024 * 1024, true, true}, true)
}
// this is 1024 1k files in the tar archive
func Benchmark1kFilesTar(b *testing.B) {
benchmarkTar(b, sizedOptions{1024, 1024, true, true}, false)
}
// this is 1024 1k files in the tar archive
func Benchmark1kFilesTarGzip(b *testing.B) {
benchmarkTar(b, sizedOptions{1024, 1024, true, true}, true)
}
func benchmarkTar(b *testing.B, opts sizedOptions, isGzip bool) {
var fh *os.File
tarReader := sizedTar(opts)
if br, ok := tarReader.(*os.File); ok {
fh = br
}
defer os.Remove(fh.Name())
defer fh.Close()
b.SetBytes(opts.size * opts.num)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ts, err := NewTarSum(fh, !isGzip, Version0)
if err != nil {
b.Error(err)
return
}
io.Copy(ioutil.Discard, ts)
ts.Sum(nil)
fh.Seek(0, 0)
}
}