419 lines
11 KiB
Go
419 lines
11 KiB
Go
package tarsum
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import (
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"bytes"
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"compress/gzip"
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"crypto/md5"
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"crypto/rand"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"encoding/hex"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"testing"
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"github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar"
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)
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type testLayer struct {
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filename string
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options *sizedOptions
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jsonfile string
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gzip bool
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tarsum string
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version Version
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hash THash
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}
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var testLayers = []testLayer{
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{
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filename: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar",
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jsonfile: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/json",
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version: Version0,
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tarsum: "tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b"},
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{
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filename: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar",
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jsonfile: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/json",
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version: VersionDev,
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tarsum: "tarsum.dev+sha256:486b86e25c4db4551228154848bc4663b15dd95784b1588980f4ba1cb42e83e9"},
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{
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filename: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar",
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jsonfile: "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/json",
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gzip: true,
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tarsum: "tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b"},
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{
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// Tests existing version of TarSum when xattrs are present
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filename: "testdata/xattr/layer.tar",
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jsonfile: "testdata/xattr/json",
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version: Version0,
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tarsum: "tarsum+sha256:e86f81a4d552f13039b1396ed03ca968ea9717581f9577ef1876ea6ff9b38c98"},
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{
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// Tests next version of TarSum when xattrs are present
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filename: "testdata/xattr/layer.tar",
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jsonfile: "testdata/xattr/json",
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version: VersionDev,
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tarsum: "tarsum.dev+sha256:6235cd3a2afb7501bac541772a3d61a3634e95bc90bb39a4676e2cb98d08390d"},
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{
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filename: "testdata/511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158/layer.tar",
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jsonfile: "testdata/511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158/json",
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tarsum: "tarsum+sha256:ac672ee85da9ab7f9667ae3c32841d3e42f33cc52c273c23341dabba1c8b0c8b"},
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{
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options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
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tarsum: "tarsum+sha256:8bf12d7e67c51ee2e8306cba569398b1b9f419969521a12ffb9d8875e8836738"},
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{
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// this tar has two files with the same path
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filename: "testdata/collision/collision-0.tar",
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tarsum: "tarsum+sha256:08653904a68d3ab5c59e65ef58c49c1581caa3c34744f8d354b3f575ea04424a"},
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{
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// this tar has the same two files (with the same path), but reversed order. ensuring is has different hash than above
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filename: "testdata/collision/collision-1.tar",
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tarsum: "tarsum+sha256:b51c13fbefe158b5ce420d2b930eef54c5cd55c50a2ee4abdddea8fa9f081e0d"},
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{
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// this tar has newer of collider-0.tar, ensuring is has different hash
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filename: "testdata/collision/collision-2.tar",
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tarsum: "tarsum+sha256:381547080919bb82691e995508ae20ed33ce0f6948d41cafbeb70ce20c73ee8e"},
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{
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// this tar has newer of collider-1.tar, ensuring is has different hash
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filename: "testdata/collision/collision-3.tar",
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tarsum: "tarsum+sha256:f886e431c08143164a676805205979cd8fa535dfcef714db5515650eea5a7c0f"},
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{
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options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
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tarsum: "tarsum+md5:0d7529ec7a8360155b48134b8e599f53",
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hash: md5THash,
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},
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{
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options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
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tarsum: "tarsum+sha1:f1fee39c5925807ff75ef1925e7a23be444ba4df",
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hash: sha1Hash,
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},
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{
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options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
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tarsum: "tarsum+sha224:6319390c0b061d639085d8748b14cd55f697cf9313805218b21cf61c",
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hash: sha224Hash,
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},
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{
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options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
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tarsum: "tarsum+sha384:a578ce3ce29a2ae03b8ed7c26f47d0f75b4fc849557c62454be4b5ffd66ba021e713b48ce71e947b43aab57afd5a7636",
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hash: sha384Hash,
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},
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{
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options: &sizedOptions{1, 1024 * 1024, false, false}, // a 1mb file (in memory)
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tarsum: "tarsum+sha512:e9bfb90ca5a4dfc93c46ee061a5cf9837de6d2fdf82544d6460d3147290aecfabf7b5e415b9b6e72db9b8941f149d5d69fb17a394cbfaf2eac523bd9eae21855",
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hash: sha512Hash,
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},
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}
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type sizedOptions struct {
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num int64
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size int64
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isRand bool
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realFile bool
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}
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// make a tar:
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// * num is the number of files the tar should have
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// * size is the bytes per file
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// * isRand is whether the contents of the files should be a random chunk (otherwise it's all zeros)
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// * realFile will write to a TempFile, instead of an in memory buffer
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func sizedTar(opts sizedOptions) io.Reader {
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var (
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fh io.ReadWriter
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err error
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)
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if opts.realFile {
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fh, err = ioutil.TempFile("", "tarsum")
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if err != nil {
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return nil
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}
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} else {
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fh = bytes.NewBuffer([]byte{})
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}
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tarW := tar.NewWriter(fh)
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for i := int64(0); i < opts.num; i++ {
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err := tarW.WriteHeader(&tar.Header{
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Name: fmt.Sprintf("/testdata%d", i),
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Mode: 0755,
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Uid: 0,
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Gid: 0,
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Size: opts.size,
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})
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if err != nil {
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return nil
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}
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var rBuf []byte
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if opts.isRand {
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rBuf = make([]byte, 8)
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_, err = rand.Read(rBuf)
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if err != nil {
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return nil
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}
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} else {
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rBuf = []byte{0, 0, 0, 0, 0, 0, 0, 0}
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}
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for i := int64(0); i < opts.size/int64(8); i++ {
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tarW.Write(rBuf)
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}
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}
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return fh
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}
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func emptyTarSum(gzip bool) (TarSum, error) {
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reader, writer := io.Pipe()
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tarWriter := tar.NewWriter(writer)
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// Immediately close tarWriter and write-end of the
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// Pipe in a separate goroutine so we don't block.
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go func() {
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tarWriter.Close()
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writer.Close()
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}()
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return NewTarSum(reader, !gzip, Version0)
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}
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// TestEmptyTar tests that tarsum does not fail to read an empty tar
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// and correctly returns the hex digest of an empty hash.
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func TestEmptyTar(t *testing.T) {
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// Test without gzip.
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ts, err := emptyTarSum(false)
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if err != nil {
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t.Fatal(err)
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}
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zeroBlock := make([]byte, 1024)
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buf := new(bytes.Buffer)
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n, err := io.Copy(buf, ts)
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if err != nil {
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t.Fatal(err)
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}
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if n != int64(len(zeroBlock)) || !bytes.Equal(buf.Bytes(), zeroBlock) {
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t.Fatalf("tarSum did not write the correct number of zeroed bytes: %d", n)
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}
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expectedSum := ts.Version().String() + "+sha256:" + hex.EncodeToString(sha256.New().Sum(nil))
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resultSum := ts.Sum(nil)
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if resultSum != expectedSum {
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t.Fatalf("expected [%s] but got [%s]", expectedSum, resultSum)
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}
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// Test with gzip.
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ts, err = emptyTarSum(true)
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if err != nil {
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t.Fatal(err)
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}
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buf.Reset()
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n, err = io.Copy(buf, ts)
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if err != nil {
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t.Fatal(err)
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}
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bufgz := new(bytes.Buffer)
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gz := gzip.NewWriter(bufgz)
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n, err = io.Copy(gz, bytes.NewBuffer(zeroBlock))
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gz.Close()
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gzBytes := bufgz.Bytes()
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if n != int64(len(zeroBlock)) || !bytes.Equal(buf.Bytes(), gzBytes) {
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t.Fatalf("tarSum did not write the correct number of gzipped-zeroed bytes: %d", n)
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}
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resultSum = ts.Sum(nil)
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if resultSum != expectedSum {
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t.Fatalf("expected [%s] but got [%s]", expectedSum, resultSum)
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}
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// Test without ever actually writing anything.
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if ts, err = NewTarSum(bytes.NewReader([]byte{}), true, Version0); err != nil {
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t.Fatal(err)
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}
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resultSum = ts.Sum(nil)
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if resultSum != expectedSum {
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t.Fatalf("expected [%s] but got [%s]", expectedSum, resultSum)
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}
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}
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var (
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md5THash = NewTHash("md5", md5.New)
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sha1Hash = NewTHash("sha1", sha1.New)
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sha224Hash = NewTHash("sha224", sha256.New224)
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sha384Hash = NewTHash("sha384", sha512.New384)
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sha512Hash = NewTHash("sha512", sha512.New)
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)
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func TestTarSums(t *testing.T) {
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for _, layer := range testLayers {
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var (
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fh io.Reader
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err error
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)
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if len(layer.filename) > 0 {
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fh, err = os.Open(layer.filename)
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if err != nil {
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t.Errorf("failed to open %s: %s", layer.filename, err)
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continue
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}
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} else if layer.options != nil {
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fh = sizedTar(*layer.options)
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} else {
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// What else is there to test?
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t.Errorf("what to do with %#v", layer)
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continue
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}
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if file, ok := fh.(*os.File); ok {
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defer file.Close()
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}
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var ts TarSum
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if layer.hash == nil {
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// double negatives!
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ts, err = NewTarSum(fh, !layer.gzip, layer.version)
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} else {
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ts, err = NewTarSumHash(fh, !layer.gzip, layer.version, layer.hash)
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}
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if err != nil {
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t.Errorf("%q :: %q", err, layer.filename)
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continue
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}
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// Read variable number of bytes to test dynamic buffer
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dBuf := make([]byte, 1)
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_, err = ts.Read(dBuf)
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if err != nil {
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t.Errorf("failed to read 1B from %s: %s", layer.filename, err)
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continue
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}
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dBuf = make([]byte, 16*1024)
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_, err = ts.Read(dBuf)
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if err != nil {
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t.Errorf("failed to read 16KB from %s: %s", layer.filename, err)
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continue
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}
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// Read and discard remaining bytes
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_, err = io.Copy(ioutil.Discard, ts)
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if err != nil {
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t.Errorf("failed to copy from %s: %s", layer.filename, err)
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continue
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}
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var gotSum string
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if len(layer.jsonfile) > 0 {
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jfh, err := os.Open(layer.jsonfile)
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if err != nil {
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t.Errorf("failed to open %s: %s", layer.jsonfile, err)
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continue
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}
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buf, err := ioutil.ReadAll(jfh)
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if err != nil {
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t.Errorf("failed to readAll %s: %s", layer.jsonfile, err)
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continue
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}
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gotSum = ts.Sum(buf)
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} else {
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gotSum = ts.Sum(nil)
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}
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if layer.tarsum != gotSum {
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t.Errorf("expecting [%s], but got [%s]", layer.tarsum, gotSum)
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}
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}
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}
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func Benchmark9kTar(b *testing.B) {
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buf := bytes.NewBuffer([]byte{})
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fh, err := os.Open("testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar")
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if err != nil {
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b.Error(err)
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return
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}
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n, err := io.Copy(buf, fh)
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fh.Close()
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b.SetBytes(n)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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ts, err := NewTarSum(buf, true, Version0)
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if err != nil {
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b.Error(err)
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return
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}
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io.Copy(ioutil.Discard, ts)
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ts.Sum(nil)
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}
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}
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func Benchmark9kTarGzip(b *testing.B) {
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buf := bytes.NewBuffer([]byte{})
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fh, err := os.Open("testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar")
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if err != nil {
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b.Error(err)
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return
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}
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n, err := io.Copy(buf, fh)
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fh.Close()
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b.SetBytes(n)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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ts, err := NewTarSum(buf, false, Version0)
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if err != nil {
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b.Error(err)
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return
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}
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io.Copy(ioutil.Discard, ts)
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ts.Sum(nil)
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}
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}
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// this is a single big file in the tar archive
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func Benchmark1mbSingleFileTar(b *testing.B) {
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benchmarkTar(b, sizedOptions{1, 1024 * 1024, true, true}, false)
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}
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// this is a single big file in the tar archive
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func Benchmark1mbSingleFileTarGzip(b *testing.B) {
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benchmarkTar(b, sizedOptions{1, 1024 * 1024, true, true}, true)
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}
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// this is 1024 1k files in the tar archive
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func Benchmark1kFilesTar(b *testing.B) {
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benchmarkTar(b, sizedOptions{1024, 1024, true, true}, false)
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}
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// this is 1024 1k files in the tar archive
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func Benchmark1kFilesTarGzip(b *testing.B) {
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benchmarkTar(b, sizedOptions{1024, 1024, true, true}, true)
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}
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func benchmarkTar(b *testing.B, opts sizedOptions, isGzip bool) {
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var fh *os.File
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tarReader := sizedTar(opts)
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if br, ok := tarReader.(*os.File); ok {
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fh = br
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}
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defer os.Remove(fh.Name())
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defer fh.Close()
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b.SetBytes(opts.size * opts.num)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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ts, err := NewTarSum(fh, !isGzip, Version0)
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if err != nil {
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b.Error(err)
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return
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}
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io.Copy(ioutil.Discard, ts)
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ts.Sum(nil)
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fh.Seek(0, 0)
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}
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}
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