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tarsum.go
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tarsum.go
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package tarsum
import (
"bytes"
"compress/gzip"
"crypto"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"hash"
"io"
"strings"
"github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar"
)
const (
buf8K = 8 * 1024
buf16K = 16 * 1024
buf32K = 32 * 1024
)
// NewTarSum creates a new interface for calculating a fixed time checksum of a
// tar archive.
//
// This is used for calculating checksums of layers of an image, in some cases
// including the byte payload of the image's json metadata as well, and for
// calculating the checksums for buildcache.
func NewTarSum(r io.Reader, dc bool, v Version) (TarSum, error) {
return NewTarSumHash(r, dc, v, DefaultTHash)
}
// Create a new TarSum, providing a THash to use rather than the DefaultTHash
func NewTarSumHash(r io.Reader, dc bool, v Version, tHash THash) (TarSum, error) {
headerSelector, err := getTarHeaderSelector(v)
if err != nil {
return nil, err
}
ts := &tarSum{Reader: r, DisableCompression: dc, tarSumVersion: v, headerSelector: headerSelector, tHash: tHash}
err = ts.initTarSum()
return ts, err
}
// Create a new TarSum using the provided TarSum version+hash label.
func NewTarSumForLabel(r io.Reader, disableCompression bool, label string) (TarSum, error) {
parts := strings.SplitN(label, "+", 2)
if len(parts) != 2 {
return nil, errors.New("tarsum label string should be of the form: {tarsum_version}+{hash_name}")
}
versionName, hashName := parts[0], parts[1]
version, ok := tarSumVersionsByName[versionName]
if !ok {
return nil, fmt.Errorf("unknown TarSum version name: %q", versionName)
}
hashConfig, ok := standardHashConfigs[hashName]
if !ok {
return nil, fmt.Errorf("unknown TarSum hash name: %q", hashName)
}
tHash := NewTHash(hashConfig.name, hashConfig.hash.New)
return NewTarSumHash(r, disableCompression, version, tHash)
}
// TarSum is the generic interface for calculating fixed time
// checksums of a tar archive
type TarSum interface {
io.Reader
GetSums() FileInfoSums
Sum([]byte) string
Version() Version
Hash() THash
}
// tarSum struct is the structure for a Version0 checksum calculation
type tarSum struct {
io.Reader
tarR *tar.Reader
tarW *tar.Writer
writer writeCloseFlusher
bufTar *bytes.Buffer
bufWriter *bytes.Buffer
bufData []byte
h hash.Hash
tHash THash
sums FileInfoSums
fileCounter int64
currentFile string
finished bool
first bool
DisableCompression bool // false by default. When false, the output gzip compressed.
tarSumVersion Version // this field is not exported so it can not be mutated during use
headerSelector tarHeaderSelector // handles selecting and ordering headers for files in the archive
}
func (ts tarSum) Hash() THash {
return ts.tHash
}
func (ts tarSum) Version() Version {
return ts.tarSumVersion
}
// A hash.Hash type generator and its name
type THash interface {
Hash() hash.Hash
Name() string
}
// Convenience method for creating a THash
func NewTHash(name string, h func() hash.Hash) THash {
return simpleTHash{n: name, h: h}
}
type tHashConfig struct {
name string
hash crypto.Hash
}
var (
// NOTE: DO NOT include MD5 or SHA1, which are considered insecure.
standardHashConfigs = map[string]tHashConfig{
"sha256": {name: "sha256", hash: crypto.SHA256},
"sha512": {name: "sha512", hash: crypto.SHA512},
}
)
// TarSum default is "sha256"
var DefaultTHash = NewTHash("sha256", sha256.New)
type simpleTHash struct {
n string
h func() hash.Hash
}
func (sth simpleTHash) Name() string { return sth.n }
func (sth simpleTHash) Hash() hash.Hash { return sth.h() }
func (ts *tarSum) encodeHeader(h *tar.Header) error {
for _, elem := range ts.headerSelector.selectHeaders(h) {
if _, err := ts.h.Write([]byte(elem[0] + elem[1])); err != nil {
return err
}
}
return nil
}
func (ts *tarSum) initTarSum() error {
ts.bufTar = bytes.NewBuffer([]byte{})
ts.bufWriter = bytes.NewBuffer([]byte{})
ts.tarR = tar.NewReader(ts.Reader)
ts.tarW = tar.NewWriter(ts.bufTar)
if !ts.DisableCompression {
ts.writer = gzip.NewWriter(ts.bufWriter)
} else {
ts.writer = &nopCloseFlusher{Writer: ts.bufWriter}
}
if ts.tHash == nil {
ts.tHash = DefaultTHash
}
ts.h = ts.tHash.Hash()
ts.h.Reset()
ts.first = true
ts.sums = FileInfoSums{}
return nil
}
func (ts *tarSum) Read(buf []byte) (int, error) {
if ts.finished {
return ts.bufWriter.Read(buf)
}
if len(ts.bufData) < len(buf) {
switch {
case len(buf) <= buf8K:
ts.bufData = make([]byte, buf8K)
case len(buf) <= buf16K:
ts.bufData = make([]byte, buf16K)
case len(buf) <= buf32K:
ts.bufData = make([]byte, buf32K)
default:
ts.bufData = make([]byte, len(buf))
}
}
buf2 := ts.bufData[:len(buf)]
n, err := ts.tarR.Read(buf2)
if err != nil {
if err == io.EOF {
if _, err := ts.h.Write(buf2[:n]); err != nil {
return 0, err
}
if !ts.first {
ts.sums = append(ts.sums, fileInfoSum{name: ts.currentFile, sum: hex.EncodeToString(ts.h.Sum(nil)), pos: ts.fileCounter})
ts.fileCounter++
ts.h.Reset()
} else {
ts.first = false
}
currentHeader, err := ts.tarR.Next()
if err != nil {
if err == io.EOF {
if err := ts.tarW.Close(); err != nil {
return 0, err
}
if _, err := io.Copy(ts.writer, ts.bufTar); err != nil {
return 0, err
}
if err := ts.writer.Close(); err != nil {
return 0, err
}
ts.finished = true
return n, nil
}
return n, err
}
ts.currentFile = strings.TrimSuffix(strings.TrimPrefix(currentHeader.Name, "./"), "/")
if err := ts.encodeHeader(currentHeader); err != nil {
return 0, err
}
if err := ts.tarW.WriteHeader(currentHeader); err != nil {
return 0, err
}
if _, err := ts.tarW.Write(buf2[:n]); err != nil {
return 0, err
}
ts.tarW.Flush()
if _, err := io.Copy(ts.writer, ts.bufTar); err != nil {
return 0, err
}
ts.writer.Flush()
return ts.bufWriter.Read(buf)
}
return n, err
}
// Filling the hash buffer
if _, err = ts.h.Write(buf2[:n]); err != nil {
return 0, err
}
// Filling the tar writter
if _, err = ts.tarW.Write(buf2[:n]); err != nil {
return 0, err
}
ts.tarW.Flush()
// Filling the output writer
if _, err = io.Copy(ts.writer, ts.bufTar); err != nil {
return 0, err
}
ts.writer.Flush()
return ts.bufWriter.Read(buf)
}
func (ts *tarSum) Sum(extra []byte) string {
ts.sums.SortBySums()
h := ts.tHash.Hash()
if extra != nil {
h.Write(extra)
}
for _, fis := range ts.sums {
h.Write([]byte(fis.Sum()))
}
checksum := ts.Version().String() + "+" + ts.tHash.Name() + ":" + hex.EncodeToString(h.Sum(nil))
return checksum
}
func (ts *tarSum) GetSums() FileInfoSums {
return ts.sums
}