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Remove tarsum support for digest package

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tarsum is not actually used by the registry. Remove support for it.

Convert numerous uses in unit tests to SHA256.

Update docs to remove mentions of tarsums (which were often inaccurate).

Remove tarsum dependency.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2015-12-15 17:18:13 -08:00
parent 200cbe8b8e
commit 4c850e7165
47 changed files with 90 additions and 2358 deletions
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5
Godeps/Godeps.json generated
View file

@ -83,11 +83,6 @@
"ImportPath": "github.com/denverdino/aliyungo/util", "ImportPath": "github.com/denverdino/aliyungo/util",
"Rev": "0e0f322d0a54b994dea9d32541050d177edf6aa3" "Rev": "0e0f322d0a54b994dea9d32541050d177edf6aa3"
}, },
{
"ImportPath": "github.com/docker/docker/pkg/tarsum",
"Comment": "v1.4.1-3932-gb63ec6e",
"Rev": "b63ec6e4b1f6f5c77a6a74a52fcea9564538c575"
},
{ {
"ImportPath": "github.com/docker/libtrust", "ImportPath": "github.com/docker/libtrust",
"Rev": "fa567046d9b14f6aa788882a950d69651d230b21" "Rev": "fa567046d9b14f6aa788882a950d69651d230b21"

20
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/builder_context.go generated vendored
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@ -1,20 +0,0 @@
package tarsum
// This interface extends TarSum by adding the Remove method. In general
// there was concern about adding this method to TarSum itself so instead
// it is being added just to "BuilderContext" which will then only be used
// during the .dockerignore file processing - see builder/evaluator.go
type BuilderContext interface {
TarSum
Remove(string)
}
func (bc *tarSum) Remove(filename string) {
for i, fis := range bc.sums {
if fis.Name() == filename {
bc.sums = append(bc.sums[:i], bc.sums[i+1:]...)
// Note, we don't just return because there could be
// more than one with this name
}
}
}

63
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/builder_context_test.go generated vendored
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@ -1,63 +0,0 @@
package tarsum
import (
"io"
"io/ioutil"
"os"
"testing"
)
// Try to remove tarsum (in the BuilderContext) that do not exists, won't change a thing
func TestTarSumRemoveNonExistent(t *testing.T) {
filename := "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar"
reader, err := os.Open(filename)
if err != nil {
t.Fatal(err)
}
ts, err := NewTarSum(reader, false, Version0)
if err != nil {
t.Fatal(err)
}
// Read and discard bytes so that it populates sums
_, err = io.Copy(ioutil.Discard, ts)
if err != nil {
t.Errorf("failed to read from %s: %s", filename, err)
}
expected := len(ts.GetSums())
ts.(BuilderContext).Remove("")
ts.(BuilderContext).Remove("Anything")
if len(ts.GetSums()) != expected {
t.Fatalf("Expected %v sums, go %v.", expected, ts.GetSums())
}
}
// Remove a tarsum (in the BuilderContext)
func TestTarSumRemove(t *testing.T) {
filename := "testdata/46af0962ab5afeb5ce6740d4d91652e69206fc991fd5328c1a94d364ad00e457/layer.tar"
reader, err := os.Open(filename)
if err != nil {
t.Fatal(err)
}
ts, err := NewTarSum(reader, false, Version0)
if err != nil {
t.Fatal(err)
}
// Read and discard bytes so that it populates sums
_, err = io.Copy(ioutil.Discard, ts)
if err != nil {
t.Errorf("failed to read from %s: %s", filename, err)
}
expected := len(ts.GetSums()) - 1
ts.(BuilderContext).Remove("etc/sudoers")
if len(ts.GetSums()) != expected {
t.Fatalf("Expected %v sums, go %v.", expected, len(ts.GetSums()))
}
}

116
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/fileinfosums.go generated vendored
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@ -1,116 +0,0 @@
package tarsum
import "sort"
// This info will be accessed through interface so the actual name and sum cannot be medled with
type FileInfoSumInterface interface {
// File name
Name() string
// Checksum of this particular file and its headers
Sum() string
// Position of file in the tar
Pos() int64
}
type fileInfoSum struct {
name string
sum string
pos int64
}
func (fis fileInfoSum) Name() string {
return fis.name
}
func (fis fileInfoSum) Sum() string {
return fis.sum
}
func (fis fileInfoSum) Pos() int64 {
return fis.pos
}
type FileInfoSums []FileInfoSumInterface
// GetFile returns the first FileInfoSumInterface with a matching name
func (fis FileInfoSums) GetFile(name string) FileInfoSumInterface {
for i := range fis {
if fis[i].Name() == name {
return fis[i]
}
}
return nil
}
// GetAllFile returns a FileInfoSums with all matching names
func (fis FileInfoSums) GetAllFile(name string) FileInfoSums {
f := FileInfoSums{}
for i := range fis {
if fis[i].Name() == name {
f = append(f, fis[i])
}
}
return f
}
func (fis FileInfoSums) GetDuplicatePaths() (dups FileInfoSums) {
seen := make(map[string]int, len(fis)) // allocate earl. no need to grow this map.
for i := range fis {
f := fis[i]
if _, ok := seen[f.Name()]; ok {
dups = append(dups, f)
} else {
seen[f.Name()] = 0
}
}
return dups
}
func (fis FileInfoSums) Len() int { return len(fis) }
func (fis FileInfoSums) Swap(i, j int) { fis[i], fis[j] = fis[j], fis[i] }
func (fis FileInfoSums) SortByPos() {
sort.Sort(byPos{fis})
}
func (fis FileInfoSums) SortByNames() {
sort.Sort(byName{fis})
}
func (fis FileInfoSums) SortBySums() {
dups := fis.GetDuplicatePaths()
if len(dups) > 0 {
sort.Sort(bySum{fis, dups})
} else {
sort.Sort(bySum{fis, nil})
}
}
// byName is a sort.Sort helper for sorting by file names.
// If names are the same, order them by their appearance in the tar archive
type byName struct{ FileInfoSums }
func (bn byName) Less(i, j int) bool {
if bn.FileInfoSums[i].Name() == bn.FileInfoSums[j].Name() {
return bn.FileInfoSums[i].Pos() < bn.FileInfoSums[j].Pos()
}
return bn.FileInfoSums[i].Name() < bn.FileInfoSums[j].Name()
}
// bySum is a sort.Sort helper for sorting by the sums of all the fileinfos in the tar archive
type bySum struct {
FileInfoSums
dups FileInfoSums
}
func (bs bySum) Less(i, j int) bool {
if bs.dups != nil && bs.FileInfoSums[i].Name() == bs.FileInfoSums[j].Name() {
return bs.FileInfoSums[i].Pos() < bs.FileInfoSums[j].Pos()
}
return bs.FileInfoSums[i].Sum() < bs.FileInfoSums[j].Sum()
}
// byPos is a sort.Sort helper for sorting by the sums of all the fileinfos by their original order
type byPos struct{ FileInfoSums }
func (bp byPos) Less(i, j int) bool {
return bp.FileInfoSums[i].Pos() < bp.FileInfoSums[j].Pos()
}

62
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/fileinfosums_test.go generated vendored
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@ -1,62 +0,0 @@
package tarsum
import "testing"
func newFileInfoSums() FileInfoSums {
return FileInfoSums{
fileInfoSum{name: "file3", sum: "2abcdef1234567890", pos: 2},
fileInfoSum{name: "dup1", sum: "deadbeef1", pos: 5},
fileInfoSum{name: "file1", sum: "0abcdef1234567890", pos: 0},
fileInfoSum{name: "file4", sum: "3abcdef1234567890", pos: 3},
fileInfoSum{name: "dup1", sum: "deadbeef0", pos: 4},
fileInfoSum{name: "file2", sum: "1abcdef1234567890", pos: 1},
}
}
func TestSortFileInfoSums(t *testing.T) {
dups := newFileInfoSums().GetAllFile("dup1")
if len(dups) != 2 {
t.Errorf("expected length 2, got %d", len(dups))
}
dups.SortByNames()
if dups[0].Pos() != 4 {
t.Errorf("sorted dups should be ordered by position. Expected 4, got %d", dups[0].Pos())
}
fis := newFileInfoSums()
expected := "0abcdef1234567890"
fis.SortBySums()
got := fis[0].Sum()
if got != expected {
t.Errorf("Expected %q, got %q", expected, got)
}
fis = newFileInfoSums()
expected = "dup1"
fis.SortByNames()
gotFis := fis[0]
if gotFis.Name() != expected {
t.Errorf("Expected %q, got %q", expected, gotFis.Name())
}
// since a duplicate is first, ensure it is ordered first by position too
if gotFis.Pos() != 4 {
t.Errorf("Expected %d, got %d", 4, gotFis.Pos())
}
fis = newFileInfoSums()
fis.SortByPos()
if fis[0].Pos() != 0 {
t.Errorf("sorted fileInfoSums by Pos should order them by position.")
}
fis = newFileInfoSums()
expected = "deadbeef1"
gotFileInfoSum := fis.GetFile("dup1")
if gotFileInfoSum.Sum() != expected {
t.Errorf("Expected %q, got %q", expected, gotFileInfoSum)
}
if fis.GetFile("noPresent") != nil {
t.Errorf("Should have return nil if name not found.")
}
}

276
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/tarsum.go generated vendored
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@ -1,276 +0,0 @@
package tarsum
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"hash"
"io"
"strings"
)
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
}

225
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/tarsum_spec.md generated vendored
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@ -1,225 +0,0 @@
page_title: TarSum checksum specification
page_description: Documentation for algorithms used in the TarSum checksum calculation
page_keywords: docker, checksum, validation, tarsum
# TarSum Checksum Specification
## Abstract
This document describes the algorithms used in performing the TarSum checksum
calculation on filesystem layers, the need for this method over existing
methods, and the versioning of this calculation.
## Introduction
The transportation of filesystems, regarding Docker, is done with tar(1)
archives. There are a variety of tar serialization formats [2], and a key
concern here is ensuring a repeatable checksum given a set of inputs from a
generic tar archive. Types of transportation include distribution to and from a
registry endpoint, saving and loading through commands or Docker daemon APIs,
transferring the build context from client to Docker daemon, and committing the
filesystem of a container to become an image.
As tar archives are used for transit, but not preserved in many situations, the
focus of the algorithm is to ensure the integrity of the preserved filesystem,
while maintaining a deterministic accountability. This includes neither
constraining the ordering or manipulation of the files during the creation or
unpacking of the archive, nor include additional metadata state about the file
system attributes.
## Intended Audience
This document is outlining the methods used for consistent checksum calculation
for filesystems transported via tar archives.
Auditing these methodologies is an open and iterative process. This document
should accommodate the review of source code. Ultimately, this document should
be the starting point of further refinements to the algorithm and its future
versions.
## Concept
The checksum mechanism must ensure the integrity and assurance of the
filesystem payload.
## Checksum Algorithm Profile
A checksum mechanism must define the following operations and attributes:
* Associated hashing cipher - used to checksum each file payload and attribute
information.
* Checksum list - each file of the filesystem archive has its checksum
calculated from the payload and attributes of the file. The final checksum is
calculated from this list, with specific ordering.
* Version - as the algorithm adapts to requirements, there are behaviors of the
algorithm to manage by versioning.
* Archive being calculated - the tar archive having its checksum calculated
## Elements of TarSum checksum
The calculated sum output is a text string. The elements included in the output
of the calculated sum comprise the information needed for validation of the sum
(TarSum version and hashing cipher used) and the expected checksum in hexadecimal
form.
There are two delimiters used:
* '+' separates TarSum version from hashing cipher
* ':' separates calculation mechanics from expected hash
Example:
```
"tarsum.v1+sha256:220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e"
| | \ |
| | \ |
|_version_|_cipher__|__ |
| \ |
|_calculation_mechanics_|______________________expected_sum_______________________|
```
## Versioning
Versioning was introduced [0] to accommodate differences in calculation needed,
and ability to maintain reverse compatibility.
The general algorithm will be describe further in the 'Calculation'.
### Version0
This is the initial version of TarSum.
Its element in the TarSum checksum string is `tarsum`.
### Version1
Its element in the TarSum checksum is `tarsum.v1`.
The notable changes in this version:
* Exclusion of file `mtime` from the file information headers, in each file
checksum calculation
* Inclusion of extended attributes (`xattrs`. Also seen as `SCHILY.xattr.` prefixed Pax
tar file info headers) keys and values in each file checksum calculation
### VersionDev
*Do not use unless validating refinements to the checksum algorithm*
Its element in the TarSum checksum is `tarsum.dev`.
This is a floating place holder for a next version and grounds for testing
changes. The methods used for calculation are subject to change without notice,
and this version is for testing and not for production use.
## Ciphers
The official default and standard hashing cipher used in the calculation mechanic
is `sha256`. This refers to SHA256 hash algorithm as defined in FIPS 180-4.
Though the TarSum algorithm itself is not exclusively bound to the single
hashing cipher `sha256`, support for alternate hashing ciphers was later added
[1]. Use cases for alternate cipher could include future-proofing TarSum
checksum format and using faster cipher hashes for tar filesystem checksums.
## Calculation
### Requirement
As mentioned earlier, the calculation is such that it takes into consideration
the lifecycle of the tar archive. In that the tar archive is not an immutable,
permanent artifact. Otherwise options like relying on a known hashing cipher
checksum of the archive itself would be reliable enough. The tar archive of the
filesystem is used as a transportation medium for Docker images, and the
archive is discarded once its contents are extracted. Therefore, for consistent
validation items such as order of files in the tar archive and time stamps are
subject to change once an image is received.
### Process
The method is typically iterative due to reading tar info headers from the
archive stream, though this is not a strict requirement.
#### Files
Each file in the tar archive have their contents (headers and body) checksummed
individually using the designated associated hashing cipher. The ordered
headers of the file are written to the checksum calculation first, and then the
payload of the file body.
The resulting checksum of the file is appended to the list of file sums. The
sum is encoded as a string of the hexadecimal digest. Additionally, the file
name and position in the archive is kept as reference for special ordering.
#### Headers
The following headers are read, in this
order ( and the corresponding representation of its value):
* 'name' - string
* 'mode' - string of the base10 integer
* 'uid' - string of the integer
* 'gid' - string of the integer
* 'size' - string of the integer
* 'mtime' (_Version0 only_) - string of integer of the seconds since 1970-01-01 00:00:00 UTC
* 'typeflag' - string of the char
* 'linkname' - string
* 'uname' - string
* 'gname' - string
* 'devmajor' - string of the integer
* 'devminor' - string of the integer
For >= Version1, the extented attribute headers ("SCHILY.xattr." prefixed pax
headers) included after the above list. These xattrs key/values are first
sorted by the keys.
#### Header Format
The ordered headers are written to the hash in the format of
"{.key}{.value}"
with no newline.
#### Body
After the order headers of the file have been added to the checksum for the
file, the body of the file is written to the hash.
#### List of file sums
The list of file sums is sorted by the string of the hexadecimal digest.
If there are two files in the tar with matching paths, the order of occurrence
for that path is reflected for the sums of the corresponding file header and
body.
#### Final Checksum
Begin with a fresh or initial state of the associated hash cipher. If there is
additional payload to include in the TarSum calculation for the archive, it is
written first. Then each checksum from the ordered list of file sums is written
to the hash.
The resulting digest is formatted per the Elements of TarSum checksum,
including the TarSum version, the associated hash cipher and the hexadecimal
encoded checksum digest.
## Security Considerations
The initial version of TarSum has undergone one update that could invalidate
handcrafted tar archives. The tar archive format supports appending of files
with same names as prior files in the archive. The latter file will clobber the
prior file of the same path. Due to this the algorithm now accounts for files
with matching paths, and orders the list of file sums accordingly [3].
## Footnotes
* [0] Versioning https://github.com/docker/docker/commit/747f89cd327db9d50251b17797c4d825162226d0
* [1] Alternate ciphers https://github.com/docker/docker/commit/4e9925d780665149b8bc940d5ba242ada1973c4e
* [2] Tar http://en.wikipedia.org/wiki/Tar_%28computing%29
* [3] Name collision https://github.com/docker/docker/commit/c5e6362c53cbbc09ddbabd5a7323e04438b57d31
## Acknowledgements
Joffrey F (shin-) and Guillaume J. Charmes (creack) on the initial work of the
TarSum calculation.

648
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/tarsum_test.go generated vendored
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@ -1,648 +0,0 @@
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"
)
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)
}
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)
if err != nil {
t.Fatal(err)
}
zeroBlock := make([]byte, 1024)
buf := new(bytes.Buffer)
n, err := io.Copy(buf, ts)
if err != nil {
t.Fatal(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)
if err != nil {
t.Fatal(err)
}
buf.Reset()
n, err = io.Copy(buf, ts)
if err != nil {
t.Fatal(err)
}
bufgz := new(bytes.Buffer)
gz := gzip.NewWriter(bufgz)
n, err = io.Copy(gz, bytes.NewBuffer(zeroBlock))
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)
if resultSum != expectedSum {
t.Fatalf("expected [%s] but got [%s]", 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)
}
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
}
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
}
n, err := io.Copy(buf, fh)
fh.Close()
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
}
n, err := io.Copy(buf, fh)
fh.Close()
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)
}
}

1
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Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/testdata/xattr/json generated vendored
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@ -1 +0,0 @@
{"id":"4439c3c7f847954100b42b267e7e5529cac1d6934db082f65795c5ca2e594d93","parent":"73b164f4437db87e96e90083c73a6592f549646ae2ec00ed33c6b9b49a5c4470","created":"2014-05-16T17:19:44.091534414Z","container":"5f92fb06cc58f357f0cde41394e2bbbb664e663974b2ac1693ab07b7a306749b","container_config":{"Hostname":"9565c6517a0e","Domainname":"","User":"","Memory":0,"MemorySwap":0,"CpuShares":0,"Cpuset":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"ExposedPorts":null,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":["HOME=/","PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"],"Cmd":["/bin/sh","-c","setcap 'cap_setgid,cap_setuid+ep' ./file \u0026\u0026 getcap ./file"],"Image":"73b164f4437db87e96e90083c73a6592f549646ae2ec00ed33c6b9b49a5c4470","Volumes":null,"WorkingDir":"","Entrypoint":null,"NetworkDisabled":false,"OnBuild":[]},"docker_version":"0.11.1-dev","config":{"Hostname":"9565c6517a0e","Domainname":"","User":"","Memory":0,"MemorySwap":0,"CpuShares":0,"Cpuset":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"ExposedPorts":null,"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":["HOME=/","PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"],"Cmd":null,"Image":"73b164f4437db87e96e90083c73a6592f549646ae2ec00ed33c6b9b49a5c4470","Volumes":null,"WorkingDir":"","Entrypoint":null,"NetworkDisabled":false,"OnBuild":[]},"architecture":"amd64","os":"linux","Size":0}

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150
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/versioning.go generated vendored
View file

@ -1,150 +0,0 @@
package tarsum
import (
"archive/tar"
"errors"
"sort"
"strconv"
"strings"
)
// versioning of the TarSum algorithm
// based on the prefix of the hash used
// i.e. "tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b"
type Version int
// Prefix of "tarsum"
const (
Version0 Version = iota
Version1
// NOTE: this variable will be either the latest or an unsettled next-version of the TarSum calculation
VersionDev
)
// VersionLabelForChecksum returns the label for the given tarsum
// checksum, i.e., everything before the first `+` character in
// the string or an empty string if no label separator is found.
func VersionLabelForChecksum(checksum string) string {
// Checksums are in the form: {versionLabel}+{hashID}:{hex}
sepIndex := strings.Index(checksum, "+")
if sepIndex < 0 {
return ""
}
return checksum[:sepIndex]
}
// Get a list of all known tarsum Version
func GetVersions() []Version {
v := []Version{}
for k := range tarSumVersions {
v = append(v, k)
}
return v
}
var (
tarSumVersions = map[Version]string{
Version0: "tarsum",
Version1: "tarsum.v1",
VersionDev: "tarsum.dev",
}
tarSumVersionsByName = map[string]Version{
"tarsum": Version0,
"tarsum.v1": Version1,
"tarsum.dev": VersionDev,
}
)
func (tsv Version) String() string {
return tarSumVersions[tsv]
}
// GetVersionFromTarsum returns the Version from the provided string
func GetVersionFromTarsum(tarsum string) (Version, error) {
tsv := tarsum
if strings.Contains(tarsum, "+") {
tsv = strings.SplitN(tarsum, "+", 2)[0]
}
for v, s := range tarSumVersions {
if s == tsv {
return v, nil
}
}
return -1, ErrNotVersion
}
// Errors that may be returned by functions in this package
var (
ErrNotVersion = errors.New("string does not include a TarSum Version")
ErrVersionNotImplemented = errors.New("TarSum Version is not yet implemented")
)
// tarHeaderSelector is the interface which different versions
// of tarsum should use for selecting and ordering tar headers
// for each item in the archive.
type tarHeaderSelector interface {
selectHeaders(h *tar.Header) (orderedHeaders [][2]string)
}
type tarHeaderSelectFunc func(h *tar.Header) (orderedHeaders [][2]string)
func (f tarHeaderSelectFunc) selectHeaders(h *tar.Header) (orderedHeaders [][2]string) {
return f(h)
}
func v0TarHeaderSelect(h *tar.Header) (orderedHeaders [][2]string) {
return [][2]string{
{"name", h.Name},
{"mode", strconv.Itoa(int(h.Mode))},
{"uid", strconv.Itoa(h.Uid)},
{"gid", strconv.Itoa(h.Gid)},
{"size", strconv.Itoa(int(h.Size))},
{"mtime", strconv.Itoa(int(h.ModTime.UTC().Unix()))},
{"typeflag", string([]byte{h.Typeflag})},
{"linkname", h.Linkname},
{"uname", h.Uname},
{"gname", h.Gname},
{"devmajor", strconv.Itoa(int(h.Devmajor))},
{"devminor", strconv.Itoa(int(h.Devminor))},
}
}
func v1TarHeaderSelect(h *tar.Header) (orderedHeaders [][2]string) {
// Get extended attributes.
xAttrKeys := make([]string, len(h.Xattrs))
for k := range h.Xattrs {
xAttrKeys = append(xAttrKeys, k)
}
sort.Strings(xAttrKeys)
// Make the slice with enough capacity to hold the 11 basic headers
// we want from the v0 selector plus however many xattrs we have.
orderedHeaders = make([][2]string, 0, 11+len(xAttrKeys))
// Copy all headers from v0 excluding the 'mtime' header (the 5th element).
v0headers := v0TarHeaderSelect(h)
orderedHeaders = append(orderedHeaders, v0headers[0:5]...)
orderedHeaders = append(orderedHeaders, v0headers[6:]...)
// Finally, append the sorted xattrs.
for _, k := range xAttrKeys {
orderedHeaders = append(orderedHeaders, [2]string{k, h.Xattrs[k]})
}
return
}
var registeredHeaderSelectors = map[Version]tarHeaderSelectFunc{
Version0: v0TarHeaderSelect,
Version1: v1TarHeaderSelect,
VersionDev: v1TarHeaderSelect,
}
func getTarHeaderSelector(v Version) (tarHeaderSelector, error) {
headerSelector, ok := registeredHeaderSelectors[v]
if !ok {
return nil, ErrVersionNotImplemented
}
return headerSelector, nil
}

98
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/versioning_test.go generated vendored
View file

@ -1,98 +0,0 @@
package tarsum
import (
"testing"
)
func TestVersionLabelForChecksum(t *testing.T) {
version := VersionLabelForChecksum("tarsum+sha256:deadbeef")
if version != "tarsum" {
t.Fatalf("Version should have been 'tarsum', was %v", version)
}
version = VersionLabelForChecksum("tarsum.v1+sha256:deadbeef")
if version != "tarsum.v1" {
t.Fatalf("Version should have been 'tarsum.v1', was %v", version)
}
version = VersionLabelForChecksum("something+somethingelse")
if version != "something" {
t.Fatalf("Version should have been 'something', was %v", version)
}
version = VersionLabelForChecksum("invalidChecksum")
if version != "" {
t.Fatalf("Version should have been empty, was %v", version)
}
}
func TestVersion(t *testing.T) {
expected := "tarsum"
var v Version
if v.String() != expected {
t.Errorf("expected %q, got %q", expected, v.String())
}
expected = "tarsum.v1"
v = 1
if v.String() != expected {
t.Errorf("expected %q, got %q", expected, v.String())
}
expected = "tarsum.dev"
v = 2
if v.String() != expected {
t.Errorf("expected %q, got %q", expected, v.String())
}
}
func TestGetVersion(t *testing.T) {
testSet := []struct {
Str string
Expected Version
}{
{"tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b", Version0},
{"tarsum+sha256", Version0},
{"tarsum", Version0},
{"tarsum.dev", VersionDev},
{"tarsum.dev+sha256:deadbeef", VersionDev},
}
for _, ts := range testSet {
v, err := GetVersionFromTarsum(ts.Str)
if err != nil {
t.Fatalf("%q : %s", err, ts.Str)
}
if v != ts.Expected {
t.Errorf("expected %d (%q), got %d (%q)", ts.Expected, ts.Expected, v, v)
}
}
// test one that does not exist, to ensure it errors
str := "weak+md5:abcdeabcde"
_, err := GetVersionFromTarsum(str)
if err != ErrNotVersion {
t.Fatalf("%q : %s", err, str)
}
}
func TestGetVersions(t *testing.T) {
expected := []Version{
Version0,
Version1,
VersionDev,
}
versions := GetVersions()
if len(versions) != len(expected) {
t.Fatalf("Expected %v versions, got %v", len(expected), len(versions))
}
if !containsVersion(versions, expected[0]) || !containsVersion(versions, expected[1]) || !containsVersion(versions, expected[2]) {
t.Fatalf("Expected [%v], got [%v]", expected, versions)
}
}
func containsVersion(versions []Version, version Version) bool {
for _, v := range versions {
if v == version {
return true
}
}
return false
}

22
Godeps/_workspace/src/github.com/docker/docker/pkg/tarsum/writercloser.go generated vendored
View file

@ -1,22 +0,0 @@
package tarsum
import (
"io"
)
type writeCloseFlusher interface {
io.WriteCloser
Flush() error
}
type nopCloseFlusher struct {
io.Writer
}
func (n *nopCloseFlusher) Close() error {
return nil
}
func (n *nopCloseFlusher) Flush() error {
return nil
}

34
cmd/digest/main.go
View file

@ -4,14 +4,11 @@ import (
"flag" "flag"
"fmt" "fmt"
"io" "io"
"io/ioutil"
"log" "log"
"os" "os"
"strings"
"github.com/docker/distribution/digest" "github.com/docker/distribution/digest"
"github.com/docker/distribution/version" "github.com/docker/distribution/version"
"github.com/docker/docker/pkg/tarsum"
) )
var ( var (
@ -80,36 +77,7 @@ func main() {
digestFn := algorithm.FromReader digestFn := algorithm.FromReader
if !algorithm.Available() { if !algorithm.Available() {
// we cannot digest if is not available. An exception is made for unsupported()
// tarsum.
if !strings.HasPrefix(algorithm.String(), "tarsum") {
unsupported()
}
var version tarsum.Version
if algorithm == "tarsum" {
// small hack: if we just have tarsum, use latest
version = tarsum.Version1
} else {
var err error
version, err = tarsum.GetVersionFromTarsum(algorithm.String())
if err != nil {
unsupported()
}
}
digestFn = func(rd io.Reader) (digest.Digest, error) {
ts, err := tarsum.NewTarSum(rd, true, version)
if err != nil {
return "", err
}
if _, err := io.Copy(ioutil.Discard, ts); err != nil {
return "", err
}
return digest.Digest(ts.Sum(nil)), nil
}
} }
for _, job := range jobs { for _, job := range jobs {

37
digest/digest.go
View file

@ -4,17 +4,11 @@ import (
"fmt" "fmt"
"hash" "hash"
"io" "io"
"io/ioutil"
"regexp" "regexp"
"strings" "strings"
"github.com/docker/docker/pkg/tarsum"
) )
const ( const (
// DigestTarSumV1EmptyTar is the digest for the empty tar file.
DigestTarSumV1EmptyTar = "tarsum.v1+sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
// DigestSha256EmptyTar is the canonical sha256 digest of empty data // DigestSha256EmptyTar is the canonical sha256 digest of empty data
DigestSha256EmptyTar = "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" DigestSha256EmptyTar = "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
) )
@ -28,11 +22,6 @@ const (
// //
// sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc // sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc
// //
// More important for this code base, this type is compatible with tarsum
// digests. For example, the following would be a valid Digest:
//
// tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b
//
// This allows to abstract the digest behind this type and work only in those // This allows to abstract the digest behind this type and work only in those
// terms. // terms.
type Digest string type Digest string
@ -78,25 +67,6 @@ func FromReader(rd io.Reader) (Digest, error) {
return Canonical.FromReader(rd) return Canonical.FromReader(rd)
} }
// FromTarArchive produces a tarsum digest from reader rd.
func FromTarArchive(rd io.Reader) (Digest, error) {
ts, err := tarsum.NewTarSum(rd, true, tarsum.Version1)
if err != nil {
return "", err
}
if _, err := io.Copy(ioutil.Discard, ts); err != nil {
return "", err
}
d, err := ParseDigest(ts.Sum(nil))
if err != nil {
return "", err
}
return d, nil
}
// FromBytes digests the input and returns a Digest. // FromBytes digests the input and returns a Digest.
func FromBytes(p []byte) Digest { func FromBytes(p []byte) Digest {
digester := Canonical.New() digester := Canonical.New()
@ -117,13 +87,6 @@ func FromBytes(p []byte) Digest {
// error if not. // error if not.
func (d Digest) Validate() error { func (d Digest) Validate() error {
s := string(d) s := string(d)
// Common case will be tarsum
_, err := ParseTarSum(s)
if err == nil {
return nil
}
// Continue on for general parser
if !DigestRegexpAnchored.MatchString(s) { if !DigestRegexpAnchored.MatchString(s) {
return ErrDigestInvalidFormat return ErrDigestInvalidFormat

39
digest/digest_test.go
View file

@ -1,8 +1,6 @@
package digest package digest
import ( import (
"bytes"
"io"
"testing" "testing"
) )
@ -13,21 +11,6 @@ func TestParseDigest(t *testing.T) {
algorithm Algorithm algorithm Algorithm
hex string hex string
}{ }{
{
input: "tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
algorithm: "tarsum+sha256",
hex: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
},
{
input: "tarsum.dev+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
algorithm: "tarsum.dev+sha256",
hex: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
},
{
input: "tarsum.v1+sha256:220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
algorithm: "tarsum.v1+sha256",
hex: "220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
},
{ {
input: "sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b", input: "sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
algorithm: "sha256", algorithm: "sha256",
@ -97,25 +80,3 @@ func TestParseDigest(t *testing.T) {
} }
} }
} }
// A few test cases used to fix behavior we expect in storage backend.
func TestFromTarArchiveZeroLength(t *testing.T) {
checkTarsumDigest(t, "zero-length archive", bytes.NewReader([]byte{}), DigestTarSumV1EmptyTar)
}
func TestFromTarArchiveEmptyTar(t *testing.T) {
// String of 1024 zeros is a valid, empty tar file.
checkTarsumDigest(t, "1024 zero bytes", bytes.NewReader(bytes.Repeat([]byte("\x00"), 1024)), DigestTarSumV1EmptyTar)
}
func checkTarsumDigest(t *testing.T, msg string, rd io.Reader, expected Digest) {
dgst, err := FromTarArchive(rd)
if err != nil {
t.Fatalf("unexpected error digesting %s: %v", msg, err)
}
if dgst != expected {
t.Fatalf("unexpected digest for %s: %q != %q", msg, dgst, expected)
}
}

7
digest/digester.go
View file

@ -13,10 +13,9 @@ type Algorithm string
// supported digest types // supported digest types
const ( const (
SHA256 Algorithm = "sha256" // sha256 with hex encoding SHA256 Algorithm = "sha256" // sha256 with hex encoding
SHA384 Algorithm = "sha384" // sha384 with hex encoding SHA384 Algorithm = "sha384" // sha384 with hex encoding
SHA512 Algorithm = "sha512" // sha512 with hex encoding SHA512 Algorithm = "sha512" // sha512 with hex encoding
TarsumV1SHA256 Algorithm = "tarsum+v1+sha256" // supported tarsum version, verification only
// Canonical is the primary digest algorithm used with the distribution // Canonical is the primary digest algorithm used with the distribution
// project. Other digests may be used but this one is the primary storage // project. Other digests may be used but this one is the primary storage

14
digest/doc.go
View file

@ -1,7 +1,7 @@
// Package digest provides a generalized type to opaquely represent message // Package digest provides a generalized type to opaquely represent message
// digests and their operations within the registry. The Digest type is // digests and their operations within the registry. The Digest type is
// designed to serve as a flexible identifier in a content-addressable system. // designed to serve as a flexible identifier in a content-addressable system.
// More importantly, it provides tools and wrappers to work with tarsums and // More importantly, it provides tools and wrappers to work with
// hash.Hash-based digests with little effort. // hash.Hash-based digests with little effort.
// //
// Basics // Basics
@ -16,17 +16,7 @@
// sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc // sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc
// //
// In this case, the string "sha256" is the algorithm and the hex bytes are // In this case, the string "sha256" is the algorithm and the hex bytes are
// the "digest". A tarsum example will be more illustrative of the use case // the "digest".
// involved in the registry:
//
// tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b
//
// For this, we consider the algorithm to be "tarsum+sha256". Prudent
// applications will favor the ParseDigest function to verify the format over
// using simple type casts. However, a normal string can be cast as a digest
// with a simple type conversion:
//
// Digest("tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b")
// //
// Because the Digest type is simply a string, once a valid Digest is // Because the Digest type is simply a string, once a valid Digest is
// obtained, comparisons are cheap, quick and simple to express with the // obtained, comparisons are cheap, quick and simple to express with the

70
digest/tarsum.go
View file

@ -1,70 +0,0 @@
package digest
import (
"fmt"
"regexp"
)
// TarsumRegexp defines a regular expression to match tarsum identifiers.
var TarsumRegexp = regexp.MustCompile("tarsum(?:.[a-z0-9]+)?\\+[a-zA-Z0-9]+:[A-Fa-f0-9]+")
// TarsumRegexpCapturing defines a regular expression to match tarsum identifiers with
// capture groups corresponding to each component.
var TarsumRegexpCapturing = regexp.MustCompile("(tarsum)(.([a-z0-9]+))?\\+([a-zA-Z0-9]+):([A-Fa-f0-9]+)")
// TarSumInfo contains information about a parsed tarsum.
type TarSumInfo struct {
// Version contains the version of the tarsum.
Version string
// Algorithm contains the algorithm for the final digest
Algorithm string
// Digest contains the hex-encoded digest.
Digest string
}
// InvalidTarSumError provides informations about a TarSum that cannot be parsed
// by ParseTarSum.
type InvalidTarSumError string
func (e InvalidTarSumError) Error() string {
return fmt.Sprintf("invalid tarsum: %q", string(e))
}
// ParseTarSum parses a tarsum string into its components of interest. For
// example, this method may receive the tarsum in the following format:
//
// tarsum.v1+sha256:220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e
//
// The function will return the following:
//
// TarSumInfo{
// Version: "v1",
// Algorithm: "sha256",
// Digest: "220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
// }
//
func ParseTarSum(tarSum string) (tsi TarSumInfo, err error) {
components := TarsumRegexpCapturing.FindStringSubmatch(tarSum)
if len(components) != 1+TarsumRegexpCapturing.NumSubexp() {
return TarSumInfo{}, InvalidTarSumError(tarSum)
}
return TarSumInfo{
Version: components[3],
Algorithm: components[4],
Digest: components[5],
}, nil
}
// String returns the valid, string representation of the tarsum info.
func (tsi TarSumInfo) String() string {
if tsi.Version == "" {
return fmt.Sprintf("tarsum+%s:%s", tsi.Algorithm, tsi.Digest)
}
return fmt.Sprintf("tarsum.%s+%s:%s", tsi.Version, tsi.Algorithm, tsi.Digest)
}

79
digest/tarsum_test.go
View file

@ -1,79 +0,0 @@
package digest
import (
"reflect"
"testing"
)
func TestParseTarSumComponents(t *testing.T) {
for _, testcase := range []struct {
input string
expected TarSumInfo
err error
}{
{
input: "tarsum.v1+sha256:220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
expected: TarSumInfo{
Version: "v1",
Algorithm: "sha256",
Digest: "220a60ecd4a3c32c282622a625a54db9ba0ff55b5ba9c29c7064a2bc358b6a3e",
},
},
{
input: "",
err: InvalidTarSumError(""),
},
{
input: "purejunk",
err: InvalidTarSumError("purejunk"),
},
{
input: "tarsum.v23+test:12341234123412341effefefe",
expected: TarSumInfo{
Version: "v23",
Algorithm: "test",
Digest: "12341234123412341effefefe",
},
},
// The following test cases are ported from docker core
{
// Version 0 tarsum
input: "tarsum+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
expected: TarSumInfo{
Algorithm: "sha256",
Digest: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
},
},
{
// Dev version tarsum
input: "tarsum.dev+sha256:e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
expected: TarSumInfo{
Version: "dev",
Algorithm: "sha256",
Digest: "e58fcf7418d4390dec8e8fb69d88c06ec07039d651fedd3aa72af9972e7d046b",
},
},
} {
tsi, err := ParseTarSum(testcase.input)
if err != nil {
if testcase.err != nil && err == testcase.err {
continue // passes
}
t.Fatalf("unexpected error parsing tarsum: %v", err)
}
if testcase.err != nil {
t.Fatalf("expected error not encountered on %q: %v", testcase.input, testcase.err)
}
if !reflect.DeepEqual(tsi, testcase.expected) {
t.Fatalf("expected tarsum info: %v != %v", tsi, testcase.expected)
}
if testcase.input != tsi.String() {
t.Fatalf("input should equal output: %q != %q", tsi.String(), testcase.input)
}
}
}

86
digest/verifiers.go
View file

@ -3,9 +3,6 @@ package digest
import ( import (
"hash" "hash"
"io" "io"
"io/ioutil"
"github.com/docker/docker/pkg/tarsum"
) )
// Verifier presents a general verification interface to be used with message // Verifier presents a general verification interface to be used with message
@ -27,70 +24,10 @@ func NewDigestVerifier(d Digest) (Verifier, error) {
return nil, err return nil, err
} }
alg := d.Algorithm() return hashVerifier{
switch alg { hash: d.Algorithm().Hash(),
case "sha256", "sha384", "sha512": digest: d,
return hashVerifier{ }, nil
hash: alg.Hash(),
digest: d,
}, nil
default:
// Assume we have a tarsum.
version, err := tarsum.GetVersionFromTarsum(string(d))
if err != nil {
return nil, err
}
pr, pw := io.Pipe()
// TODO(stevvooe): We may actually want to ban the earlier versions of
// tarsum. That decision may not be the place of the verifier.
ts, err := tarsum.NewTarSum(pr, true, version)
if err != nil {
return nil, err
}
// TODO(sday): Ick! A goroutine per digest verification? We'll have to
// get the tarsum library to export an io.Writer variant.
go func() {
if _, err := io.Copy(ioutil.Discard, ts); err != nil {
pr.CloseWithError(err)
} else {
pr.Close()
}
}()
return &tarsumVerifier{
digest: d,
ts: ts,
pr: pr,
pw: pw,
}, nil
}
}
// NewLengthVerifier returns a verifier that returns true when the number of
// read bytes equals the expected parameter.
func NewLengthVerifier(expected int64) Verifier {
return &lengthVerifier{
expected: expected,
}
}
type lengthVerifier struct {
expected int64 // expected bytes read
len int64 // bytes read
}
func (lv *lengthVerifier) Write(p []byte) (n int, err error) {
n = len(p)
lv.len += int64(n)
return n, err
}
func (lv *lengthVerifier) Verified() bool {
return lv.expected == lv.len
} }
type hashVerifier struct { type hashVerifier struct {
@ -105,18 +42,3 @@ func (hv hashVerifier) Write(p []byte) (n int, err error) {
func (hv hashVerifier) Verified() bool { func (hv hashVerifier) Verified() bool {
return hv.digest == NewDigest(hv.digest.Algorithm(), hv.hash) return hv.digest == NewDigest(hv.digest.Algorithm(), hv.hash)
} }
type tarsumVerifier struct {
digest Digest
ts tarsum.TarSum
pr *io.PipeReader
pw *io.PipeWriter
}
func (tv *tarsumVerifier) Write(p []byte) (n int, err error) {
return tv.pw.Write(p)
}
func (tv *tarsumVerifier) Verified() bool {
return tv.digest == Digest(tv.ts.Sum(nil))
}

114
digest/verifiers_test.go
View file

@ -3,13 +3,8 @@ package digest
import ( import (
"bytes" "bytes"
"crypto/rand" "crypto/rand"
"encoding/base64"
"io" "io"
"os"
"strings"
"testing" "testing"
"github.com/docker/distribution/testutil"
) )
func TestDigestVerifier(t *testing.T) { func TestDigestVerifier(t *testing.T) {
@ -27,43 +22,6 @@ func TestDigestVerifier(t *testing.T) {
if !verifier.Verified() { if !verifier.Verified() {
t.Fatalf("bytes not verified") t.Fatalf("bytes not verified")
} }
tf, tarSum, err := testutil.CreateRandomTarFile()
if err != nil {
t.Fatalf("error creating tarfile: %v", err)
}
digest, err = FromTarArchive(tf)
if err != nil {
t.Fatalf("error digesting tarsum: %v", err)
}
if digest.String() != tarSum {
t.Fatalf("unexpected digest: %q != %q", digest.String(), tarSum)
}
expectedSize, _ := tf.Seek(0, os.SEEK_END) // Get tar file size
tf.Seek(0, os.SEEK_SET) // seek back
// This is the most relevant example for the registry application. It's
// effectively a read through pipeline, where the final sink is the digest
// verifier.
verifier, err = NewDigestVerifier(digest)
if err != nil {
t.Fatalf("unexpected error getting digest verifier: %s", err)
}
lengthVerifier := NewLengthVerifier(expectedSize)
rd := io.TeeReader(tf, lengthVerifier)
io.Copy(verifier, rd)
if !lengthVerifier.Verified() {
t.Fatalf("verifier detected incorrect length")
}
if !verifier.Verified() {
t.Fatalf("bytes not verified")
}
} }
// TestVerifierUnsupportedDigest ensures that unsupported digest validation is // TestVerifierUnsupportedDigest ensures that unsupported digest validation is
@ -81,79 +39,11 @@ func TestVerifierUnsupportedDigest(t *testing.T) {
} }
} }
// TestJunkNoDeadlock ensures that junk input into a digest verifier properly
// returns errors from the tarsum library. Specifically, we pass in a file
// with a "bad header" and should see the error from the io.Copy to verifier.
// This has been seen with gzipped tarfiles, mishandled by the tarsum package,
// but also on junk input, such as html.
func TestJunkNoDeadlock(t *testing.T) {
expected := Digest("tarsum.dev+sha256:62e15750aae345f6303469a94892e66365cc5e3abdf8d7cb8b329f8fb912e473")
junk := bytes.Repeat([]byte{'a'}, 1024)
verifier, err := NewDigestVerifier(expected)
if err != nil {
t.Fatalf("unexpected error creating verifier: %v", err)
}
rd := bytes.NewReader(junk)
if _, err := io.Copy(verifier, rd); err == nil {
t.Fatalf("unexpected error verifying input data: %v", err)
}
}
// TestBadTarNoDeadlock runs a tar with a "bad" tar header through digest
// verifier, ensuring that the verifier returns an error properly.
func TestBadTarNoDeadlock(t *testing.T) {
// TODO(stevvooe): This test is exposing a bug in tarsum where if we pass
// a gzipped tar file into tarsum, the library returns an error. This
// should actually work. When the tarsum package is fixed, this test will
// fail and we can remove this test or invert it.
// This tarfile was causing deadlocks in verifiers due mishandled copy error.
// This is a gzipped tar, which we typically don't see but should handle.
//
// From https://registry-1.docker.io/v2/library/ubuntu/blobs/tarsum.dev+sha256:62e15750aae345f6303469a94892e66365cc5e3abdf8d7cb8b329f8fb912e473
const badTar = `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`
expected := Digest("tarsum.dev+sha256:62e15750aae345f6303469a94892e66365cc5e3abdf8d7cb8b329f8fb912e473")
verifier, err := NewDigestVerifier(expected)
if err != nil {
t.Fatalf("unexpected error creating verifier: %v", err)
}
rd := base64.NewDecoder(base64.StdEncoding, strings.NewReader(badTar))
if _, err := io.Copy(verifier, rd); err == nil {
t.Fatalf("unexpected error verifying input data: %v", err)
}
if verifier.Verified() {
// For now, we expect an error, since tarsum library cannot handle
// compressed tars (!!!).
t.Fatalf("no error received after invalid tar")
}
}
// TODO(stevvooe): Add benchmarks to measure bytes/second throughput for // TODO(stevvooe): Add benchmarks to measure bytes/second throughput for
// DigestVerifier. We should be tarsum/gzip limited for common cases but we // DigestVerifier.
// want to verify this.
// //
// The relevant benchmarks for comparison can be run with the following // The relevant benchmark for comparison can be run with the following
// commands: // commands:
// //
// go test -bench . crypto/sha1 // go test -bench . crypto/sha1
// go test -bench . github.com/docker/docker/pkg/tarsum
// //

4
docs/notifications.md
View file

@ -170,7 +170,7 @@ Content-Type: application/vnd.docker.distribution.events.v1+json
"target": { "target": {
"mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar", "mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar",
"length": 2, "length": 2,
"digest": "tarsum.v2+sha256:0123456789abcdef1", "digest": "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5",
"repository": "library/test", "repository": "library/test",
"url": "http://example.com/v2/library/test/manifests/latest" "url": "http://example.com/v2/library/test/manifests/latest"
}, },
@ -195,7 +195,7 @@ Content-Type: application/vnd.docker.distribution.events.v1+json
"target": { "target": {
"mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar", "mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar",
"length": 3, "length": 3,
"digest": "tarsum.v2+sha256:0123456789abcdef2", "digest": "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d6",
"repository": "library/test", "repository": "library/test",
"url": "http://example.com/v2/library/test/manifests/latest" "url": "http://example.com/v2/library/test/manifests/latest"
}, },

62
docs/spec/api.md
View file

@ -3,7 +3,6 @@
title = "HTTP API V2" title = "HTTP API V2"
description = "Specification for the Registry API." description = "Specification for the Registry API."
keywords = ["registry, on-prem, images, tags, repository, distribution, api, advanced"] keywords = ["registry, on-prem, images, tags, repository, distribution, api, advanced"]
aliases = ["/registry/spec/"]
[menu.main] [menu.main]
parent="smn_registry_ref" parent="smn_registry_ref"
+++ +++
@ -302,11 +301,6 @@ Some examples of _digests_ include the following:
digest | description | digest | description |
----------------------------------------------------------------------------------|------------------------------------------------ ----------------------------------------------------------------------------------|------------------------------------------------
sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b | Common sha256 based digest | sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b | Common sha256 based digest |
tarsum.v1+sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b | Tarsum digest, used for legacy layer digests. |
> __NOTE:__ While we show an example of using a `tarsum` digest, the security
> of tarsum has not been verified. It is recommended that most implementations
> use sha256 for interoperability.
While the _algorithm_ does allow one to implement a wide variety of While the _algorithm_ does allow one to implement a wide variety of
algorithms, compliant implementations should use sha256. Heavy processing of algorithms, compliant implementations should use sha256. Heavy processing of
@ -364,7 +358,7 @@ the relevant manifest fields for the registry are the following:
----------|------------------------------------------------| ----------|------------------------------------------------|
name | The name of the image. | name | The name of the image. |
tag | The tag for this version of the image. | tag | The tag for this version of the image. |
fsLayers | A list of layer descriptors (including tarsum) | fsLayers | A list of layer descriptors (including digest) |
signature | A JWS used to verify the manifest content | signature | A JWS used to verify the manifest content |
For more information about the manifest format, please see For more information about the manifest format, please see
@ -372,8 +366,8 @@ For more information about the manifest format, please see
When the manifest is in hand, the client must verify the signature to ensure When the manifest is in hand, the client must verify the signature to ensure
the names and layers are valid. Once confirmed, the client will then use the the names and layers are valid. Once confirmed, the client will then use the
tarsums to download the individual layers. Layers are stored in as blobs in digests to download the individual layers. Layers are stored in as blobs in
the V2 registry API, keyed by their tarsum digest. the V2 registry API, keyed by their digest.
#### Pulling an Image Manifest #### Pulling an Image Manifest
@ -396,7 +390,7 @@ for details):
"tag": <tag>, "tag": <tag>,
"fsLayers": [ "fsLayers": [
{ {
"blobSum": <tarsum> "blobSum": <digest>
}, },
... ...
] ]
@ -410,15 +404,14 @@ before fetching layers.
#### Pulling a Layer #### Pulling a Layer
Layers are stored in the blob portion of the registry, keyed by tarsum digest. Layers are stored in the blob portion of the registry, keyed by digest.
Pulling a layer is carried out by a standard http request. The URL is as Pulling a layer is carried out by a standard http request. The URL is as
follows: follows:
GET /v2/<name>/blobs/<tarsum> GET /v2/<name>/blobs/<digest>
Access to a layer will be gated by the `name` of the repository but is Access to a layer will be gated by the `name` of the repository but is
identified uniquely in the registry by `tarsum`. The `tarsum` parameter is an identified uniquely in the registry by `digest`.
opaque field, to be interpreted by the tarsum library.
This endpoint may issue a 307 (302 for <HTTP 1.1) redirect to another service This endpoint may issue a 307 (302 for <HTTP 1.1) redirect to another service
for downloading the layer and clients should be prepared to handle redirects. for downloading the layer and clients should be prepared to handle redirects.
@ -469,7 +462,7 @@ API. The request should be formatted as follows:
HEAD /v2/<name>/blobs/<digest> HEAD /v2/<name>/blobs/<digest>
``` ```
If the layer with the tarsum specified in `digest` is available, a 200 OK If the layer with the digest specified in `digest` is available, a 200 OK
response will be received, with no actual body content (this is according to response will be received, with no actual body content (this is according to
http specification). The response will look as follows: http specification). The response will look as follows:
@ -482,7 +475,7 @@ Docker-Content-Digest: <digest>
When this response is received, the client can assume that the layer is When this response is received, the client can assume that the layer is
already available in the registry under the given name and should take no already available in the registry under the given name and should take no
further action to upload the layer. Note that the binary digests may differ further action to upload the layer. Note that the binary digests may differ
for the existing registry layer, but the tarsums will be guaranteed to match. for the existing registry layer, but the digests will be guaranteed to match.
##### Uploading the Layer ##### Uploading the Layer
@ -549,7 +542,7 @@ carry out a "monolithic" upload, one can simply put the entire content blob to
the provided URL: the provided URL:
``` ```
PUT /v2/<name>/blobs/uploads/<uuid>?digest=<tarsum>[&digest=sha256:<hex digest>] PUT /v2/<name>/blobs/uploads/<uuid>?digest=<digest>
Content-Length: <size of layer> Content-Length: <size of layer>
Content-Type: application/octet-stream Content-Type: application/octet-stream
@ -564,7 +557,7 @@ Additionally, the upload can be completed with a single `POST` request to
the uploads endpoint, including the "size" and "digest" parameters: the uploads endpoint, including the "size" and "digest" parameters:
``` ```
POST /v2/<name>/blobs/uploads/?digest=<tarsum>[&digest=sha256:<hex digest>] POST /v2/<name>/blobs/uploads/?digest=<digest>
Content-Length: <size of layer> Content-Length: <size of layer>
Content-Type: application/octet-stream Content-Type: application/octet-stream
@ -635,7 +628,7 @@ the upload will not be considered complete. The format for the final chunk
will be as follows: will be as follows:
``` ```
PUT /v2/<name>/blob/uploads/<uuid>?digest=<tarsum>[&digest=sha256:<hex digest>] PUT /v2/<name>/blob/uploads/<uuid>?digest=<digest>
Content-Length: <size of chunk> Content-Length: <size of chunk>
Content-Range: <start of range>-<end of range> Content-Range: <start of range>-<end of range>
Content-Type: application/octet-stream Content-Type: application/octet-stream
@ -654,7 +647,7 @@ will receive a `201 Created` response:
``` ```
201 Created 201 Created
Location: /v2/<name>/blobs/<tarsum> Location: /v2/<name>/blobs/<digest>
Content-Length: 0 Content-Length: 0
Docker-Content-Digest: <digest> Docker-Content-Digest: <digest>
``` ```
@ -668,28 +661,15 @@ the uploaded blob data.
###### Digest Parameter ###### Digest Parameter
The "digest" parameter is designed as an opaque parameter to support The "digest" parameter is designed as an opaque parameter to support
verification of a successful transfer. The initial version of the registry API verification of a successful transfer. For example, a HTTP URI parameter
will support a tarsum digest, in the standard tarsum format. For example, a might be as follows:
HTTP URI parameter might be as follows:
```
tarsum.v1+sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b
```
Given this parameter, the registry will verify that the provided content does
result in this tarsum. Optionally, the registry can support other other digest
parameters for non-tarfile content stored as a layer. A regular hash digest
might be specified as follows:
``` ```
sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b
``` ```
Such a parameter would be used to verify that the binary content (as opposed Given this parameter, the registry will verify that the provided content does
to the tar content) would be verified at the end of the upload process. match this digest.
For the initial version, registry servers are only required to support the
tarsum format.
##### Canceling an Upload ##### Canceling an Upload
@ -751,7 +731,7 @@ image manifest. An image can be pushed using the following request format:
"tag": <tag>, "tag": <tag>,
"fsLayers": [ "fsLayers": [
{ {
"blobSum": <tarsum> "blobSum": <digest>
}, },
... ...
] ]
@ -770,15 +750,15 @@ for details on possible error codes that may be returned.
If one or more layers are unknown to the registry, `BLOB_UNKNOWN` errors are If one or more layers are unknown to the registry, `BLOB_UNKNOWN` errors are
returned. The `detail` field of the error response will have a `digest` field returned. The `detail` field of the error response will have a `digest` field
identifying the missing blob, which will be a tarsum. An error is returned for identifying the missing blob. An error is returned for each unknown blob. The
each unknown blob. The response format is as follows: response format is as follows:
{ {
"errors:" [{ "errors:" [{
"code": "BLOB_UNKNOWN", "code": "BLOB_UNKNOWN",
"message": "blob unknown to registry", "message": "blob unknown to registry",
"detail": { "detail": {
"digest": <tarsum> "digest": <digest>
} }
}, },
... ...

61
docs/spec/api.md.tmpl
View file

@ -301,11 +301,6 @@ Some examples of _digests_ include the following:
digest | description | digest | description |
----------------------------------------------------------------------------------|------------------------------------------------ ----------------------------------------------------------------------------------|------------------------------------------------
sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b | Common sha256 based digest | sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b | Common sha256 based digest |
tarsum.v1+sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b | Tarsum digest, used for legacy layer digests. |
> __NOTE:__ While we show an example of using a `tarsum` digest, the security
> of tarsum has not been verified. It is recommended that most implementations
> use sha256 for interoperability.
While the _algorithm_ does allow one to implement a wide variety of While the _algorithm_ does allow one to implement a wide variety of
algorithms, compliant implementations should use sha256. Heavy processing of algorithms, compliant implementations should use sha256. Heavy processing of
@ -363,7 +358,7 @@ the relevant manifest fields for the registry are the following:
----------|------------------------------------------------| ----------|------------------------------------------------|
name | The name of the image. | name | The name of the image. |
tag | The tag for this version of the image. | tag | The tag for this version of the image. |
fsLayers | A list of layer descriptors (including tarsum) | fsLayers | A list of layer descriptors (including digest) |
signature | A JWS used to verify the manifest content | signature | A JWS used to verify the manifest content |
For more information about the manifest format, please see For more information about the manifest format, please see
@ -371,8 +366,8 @@ For more information about the manifest format, please see
When the manifest is in hand, the client must verify the signature to ensure When the manifest is in hand, the client must verify the signature to ensure
the names and layers are valid. Once confirmed, the client will then use the the names and layers are valid. Once confirmed, the client will then use the
tarsums to download the individual layers. Layers are stored in as blobs in digests to download the individual layers. Layers are stored in as blobs in
the V2 registry API, keyed by their tarsum digest. the V2 registry API, keyed by their digest.
#### Pulling an Image Manifest #### Pulling an Image Manifest
@ -395,7 +390,7 @@ for details):
"tag": <tag>, "tag": <tag>,
"fsLayers": [ "fsLayers": [
{ {
"blobSum": <tarsum> "blobSum": <digest>
}, },
... ...
] ]
@ -409,15 +404,14 @@ before fetching layers.
#### Pulling a Layer #### Pulling a Layer
Layers are stored in the blob portion of the registry, keyed by tarsum digest. Layers are stored in the blob portion of the registry, keyed by digest.
Pulling a layer is carried out by a standard http request. The URL is as Pulling a layer is carried out by a standard http request. The URL is as
follows: follows:
GET /v2/<name>/blobs/<tarsum> GET /v2/<name>/blobs/<digest>
Access to a layer will be gated by the `name` of the repository but is Access to a layer will be gated by the `name` of the repository but is
identified uniquely in the registry by `tarsum`. The `tarsum` parameter is an identified uniquely in the registry by `digest`.
opaque field, to be interpreted by the tarsum library.
This endpoint may issue a 307 (302 for <HTTP 1.1) redirect to another service This endpoint may issue a 307 (302 for <HTTP 1.1) redirect to another service
for downloading the layer and clients should be prepared to handle redirects. for downloading the layer and clients should be prepared to handle redirects.
@ -468,7 +462,7 @@ API. The request should be formatted as follows:
HEAD /v2/<name>/blobs/<digest> HEAD /v2/<name>/blobs/<digest>
``` ```
If the layer with the tarsum specified in `digest` is available, a 200 OK If the layer with the digest specified in `digest` is available, a 200 OK
response will be received, with no actual body content (this is according to response will be received, with no actual body content (this is according to
http specification). The response will look as follows: http specification). The response will look as follows:
@ -481,7 +475,7 @@ Docker-Content-Digest: <digest>
When this response is received, the client can assume that the layer is When this response is received, the client can assume that the layer is
already available in the registry under the given name and should take no already available in the registry under the given name and should take no
further action to upload the layer. Note that the binary digests may differ further action to upload the layer. Note that the binary digests may differ
for the existing registry layer, but the tarsums will be guaranteed to match. for the existing registry layer, but the digests will be guaranteed to match.
##### Uploading the Layer ##### Uploading the Layer
@ -548,7 +542,7 @@ carry out a "monolithic" upload, one can simply put the entire content blob to
the provided URL: the provided URL:
``` ```
PUT /v2/<name>/blobs/uploads/<uuid>?digest=<tarsum>[&digest=sha256:<hex digest>] PUT /v2/<name>/blobs/uploads/<uuid>?digest=<digest>
Content-Length: <size of layer> Content-Length: <size of layer>
Content-Type: application/octet-stream Content-Type: application/octet-stream
@ -563,7 +557,7 @@ Additionally, the upload can be completed with a single `POST` request to
the uploads endpoint, including the "size" and "digest" parameters: the uploads endpoint, including the "size" and "digest" parameters:
``` ```
POST /v2/<name>/blobs/uploads/?digest=<tarsum>[&digest=sha256:<hex digest>] POST /v2/<name>/blobs/uploads/?digest=<digest>
Content-Length: <size of layer> Content-Length: <size of layer>
Content-Type: application/octet-stream Content-Type: application/octet-stream
@ -634,7 +628,7 @@ the upload will not be considered complete. The format for the final chunk
will be as follows: will be as follows:
``` ```
PUT /v2/<name>/blob/uploads/<uuid>?digest=<tarsum>[&digest=sha256:<hex digest>] PUT /v2/<name>/blob/uploads/<uuid>?digest=<digest>
Content-Length: <size of chunk> Content-Length: <size of chunk>
Content-Range: <start of range>-<end of range> Content-Range: <start of range>-<end of range>
Content-Type: application/octet-stream Content-Type: application/octet-stream
@ -653,7 +647,7 @@ will receive a `201 Created` response:
``` ```
201 Created 201 Created
Location: /v2/<name>/blobs/<tarsum> Location: /v2/<name>/blobs/<digest>
Content-Length: 0 Content-Length: 0
Docker-Content-Digest: <digest> Docker-Content-Digest: <digest>
``` ```
@ -667,28 +661,15 @@ the uploaded blob data.
###### Digest Parameter ###### Digest Parameter
The "digest" parameter is designed as an opaque parameter to support The "digest" parameter is designed as an opaque parameter to support
verification of a successful transfer. The initial version of the registry API verification of a successful transfer. For example, a HTTP URI parameter
will support a tarsum digest, in the standard tarsum format. For example, a might be as follows:
HTTP URI parameter might be as follows:
```
tarsum.v1+sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b
```
Given this parameter, the registry will verify that the provided content does
result in this tarsum. Optionally, the registry can support other other digest
parameters for non-tarfile content stored as a layer. A regular hash digest
might be specified as follows:
``` ```
sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b sha256:6c3c624b58dbbcd3c0dd82b4c53f04194d1247c6eebdaab7c610cf7d66709b3b
``` ```
Such a parameter would be used to verify that the binary content (as opposed Given this parameter, the registry will verify that the provided content does
to the tar content) would be verified at the end of the upload process. match this digest.
For the initial version, registry servers are only required to support the
tarsum format.
##### Canceling an Upload ##### Canceling an Upload
@ -750,7 +731,7 @@ image manifest. An image can be pushed using the following request format:
"tag": <tag>, "tag": <tag>,
"fsLayers": [ "fsLayers": [
{ {
"blobSum": <tarsum> "blobSum": <digest>
}, },
... ...
] ]
@ -769,15 +750,15 @@ for details on possible error codes that may be returned.
If one or more layers are unknown to the registry, `BLOB_UNKNOWN` errors are If one or more layers are unknown to the registry, `BLOB_UNKNOWN` errors are
returned. The `detail` field of the error response will have a `digest` field returned. The `detail` field of the error response will have a `digest` field
identifying the missing blob, which will be a tarsum. An error is returned for identifying the missing blob. An error is returned for each unknown blob. The
each unknown blob. The response format is as follows: response format is as follows:
{ {
"errors:" [{ "errors:" [{
"code": "BLOB_UNKNOWN", "code": "BLOB_UNKNOWN",
"message": "blob unknown to registry", "message": "blob unknown to registry",
"detail": { "detail": {
"digest": <tarsum> "digest": <digest>
} }
}, },
... ...

4
docs/spec/manifest-v2-1.md
View file

@ -55,8 +55,8 @@ Manifest provides the base accessible fields for working with V2 image format
An fsLayer is a struct consisting of the following fields An fsLayer is a struct consisting of the following fields
- **`blobSum`** *digest.Digest* - **`blobSum`** *digest.Digest*
blobSum is the digest of the referenced filesystem image layer. A blobSum is the digest of the referenced filesystem image layer. A
digest can be a tarsum or sha256 hash. digest must be a sha256 hash.
- **`history`** *array* - **`history`** *array*

2
manifest/schema1/manifest.go
View file

@ -119,7 +119,7 @@ func (sm *SignedManifest) MarshalJSON() ([]byte, error) {
// FSLayer is a container struct for BlobSums defined in an image manifest // FSLayer is a container struct for BlobSums defined in an image manifest
type FSLayer struct { type FSLayer struct {
// BlobSum is the tarsum of the referenced filesystem image layer // BlobSum is the digest of the referenced filesystem image layer
BlobSum digest.Digest `json:"blobSum"` BlobSum digest.Digest `json:"blobSum"`
} }

8
notifications/event_test.go
View file

@ -49,7 +49,7 @@ func TestEventEnvelopeJSONFormat(t *testing.T) {
"target": { "target": {
"mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar", "mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar",
"size": 2, "size": 2,
"digest": "tarsum.v2+sha256:0123456789abcdef1", "digest": "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5",
"length": 2, "length": 2,
"repository": "library/test", "repository": "library/test",
"url": "http://example.com/v2/library/test/manifests/latest" "url": "http://example.com/v2/library/test/manifests/latest"
@ -75,7 +75,7 @@ func TestEventEnvelopeJSONFormat(t *testing.T) {
"target": { "target": {
"mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar", "mediaType": "application/vnd.docker.container.image.rootfs.diff+x-gtar",
"size": 3, "size": 3,
"digest": "tarsum.v2+sha256:0123456789abcdef2", "digest": "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d6",
"length": 3, "length": 3,
"repository": "library/test", "repository": "library/test",
"url": "http://example.com/v2/library/test/manifests/latest" "url": "http://example.com/v2/library/test/manifests/latest"
@ -127,7 +127,7 @@ func TestEventEnvelopeJSONFormat(t *testing.T) {
var layerPush0 Event var layerPush0 Event
layerPush0 = prototype layerPush0 = prototype
layerPush0.ID = "asdf-asdf-asdf-asdf-1" layerPush0.ID = "asdf-asdf-asdf-asdf-1"
layerPush0.Target.Digest = "tarsum.v2+sha256:0123456789abcdef1" layerPush0.Target.Digest = "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5"
layerPush0.Target.Length = 2 layerPush0.Target.Length = 2
layerPush0.Target.Size = 2 layerPush0.Target.Size = 2
layerPush0.Target.MediaType = layerMediaType layerPush0.Target.MediaType = layerMediaType
@ -137,7 +137,7 @@ func TestEventEnvelopeJSONFormat(t *testing.T) {
var layerPush1 Event var layerPush1 Event
layerPush1 = prototype layerPush1 = prototype
layerPush1.ID = "asdf-asdf-asdf-asdf-2" layerPush1.ID = "asdf-asdf-asdf-asdf-2"
layerPush1.Target.Digest = "tarsum.v2+sha256:0123456789abcdef2" layerPush1.Target.Digest = "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d6"
layerPush1.Target.Length = 3 layerPush1.Target.Length = 3
layerPush1.Target.Size = 3 layerPush1.Target.Size = 3
layerPush1.Target.MediaType = layerMediaType layerPush1.Target.MediaType = layerMediaType

8
registry/api/v2/routes_test.go
View file

@ -87,14 +87,6 @@ func TestRouter(t *testing.T) {
"name": "docker.com/foo/bar/baz", "name": "docker.com/foo/bar/baz",
}, },
}, },
{
RouteName: RouteNameBlob,
RequestURI: "/v2/foo/bar/blobs/tarsum.dev+foo:abcdef0919234",
Vars: map[string]string{
"name": "foo/bar",
"digest": "tarsum.dev+foo:abcdef0919234",
},
},
{ {
RouteName: RouteNameBlob, RouteName: RouteNameBlob,
RequestURI: "/v2/foo/bar/blobs/sha256:abcdef0919234", RequestURI: "/v2/foo/bar/blobs/sha256:abcdef0919234",

12
registry/api/v2/urls_test.go
View file

@ -35,9 +35,9 @@ func makeURLBuilderTestCases(urlBuilder *URLBuilder) []urlBuilderTestCase {
}, },
{ {
description: "build blob url", description: "build blob url",
expectedPath: "/v2/foo/bar/blobs/tarsum.v1+sha256:abcdef0123456789", expectedPath: "/v2/foo/bar/blobs/sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5",
build: func() (string, error) { build: func() (string, error) {
return urlBuilder.BuildBlobURL("foo/bar", "tarsum.v1+sha256:abcdef0123456789") return urlBuilder.BuildBlobURL("foo/bar", "sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5")
}, },
}, },
{ {
@ -49,11 +49,11 @@ func makeURLBuilderTestCases(urlBuilder *URLBuilder) []urlBuilderTestCase {
}, },
{ {
description: "build blob upload url with digest and size", description: "build blob upload url with digest and size",
expectedPath: "/v2/foo/bar/blobs/uploads/?digest=tarsum.v1%2Bsha256%3Aabcdef0123456789&size=10000", expectedPath: "/v2/foo/bar/blobs/uploads/?digest=sha256%3A3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5&size=10000",
build: func() (string, error) { build: func() (string, error) {
return urlBuilder.BuildBlobUploadURL("foo/bar", url.Values{ return urlBuilder.BuildBlobUploadURL("foo/bar", url.Values{
"size": []string{"10000"}, "size": []string{"10000"},
"digest": []string{"tarsum.v1+sha256:abcdef0123456789"}, "digest": []string{"sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5"},
}) })
}, },
}, },
@ -66,11 +66,11 @@ func makeURLBuilderTestCases(urlBuilder *URLBuilder) []urlBuilderTestCase {
}, },
{ {
description: "build blob upload chunk url with digest and size", description: "build blob upload chunk url with digest and size",
expectedPath: "/v2/foo/bar/blobs/uploads/uuid-part?digest=tarsum.v1%2Bsha256%3Aabcdef0123456789&size=10000", expectedPath: "/v2/foo/bar/blobs/uploads/uuid-part?digest=sha256%3A3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5&size=10000",
build: func() (string, error) { build: func() (string, error) {
return urlBuilder.BuildBlobUploadChunkURL("foo/bar", "uuid-part", url.Values{ return urlBuilder.BuildBlobUploadChunkURL("foo/bar", "uuid-part", url.Values{
"size": []string{"10000"}, "size": []string{"10000"},
"digest": []string{"tarsum.v1+sha256:abcdef0123456789"}, "digest": []string{"sha256:3b3692957d439ac1928219a83fac91e7bf96c153725526874673ae1f2023f8d5"},
}) })
}, },
}, },

22
registry/handlers/api_test.go
View file

@ -251,22 +251,18 @@ type blobArgs struct {
imageName string imageName string
layerFile io.ReadSeeker layerFile io.ReadSeeker
layerDigest digest.Digest layerDigest digest.Digest
tarSumStr string
} }
func makeBlobArgs(t *testing.T) blobArgs { func makeBlobArgs(t *testing.T) blobArgs {
layerFile, tarSumStr, err := testutil.CreateRandomTarFile() layerFile, layerDigest, err := testutil.CreateRandomTarFile()
if err != nil { if err != nil {
t.Fatalf("error creating random layer file: %v", err) t.Fatalf("error creating random layer file: %v", err)
} }
layerDigest := digest.Digest(tarSumStr)
args := blobArgs{ args := blobArgs{
imageName: "foo/bar", imageName: "foo/bar",
layerFile: layerFile, layerFile: layerFile,
layerDigest: layerDigest, layerDigest: layerDigest,
tarSumStr: tarSumStr,
} }
return args return args
} }
@ -393,7 +389,7 @@ func testBlobAPI(t *testing.T, env *testEnv, args blobArgs) *testEnv {
// ----------------------------------------- // -----------------------------------------
// Do layer push with an empty body and correct digest // Do layer push with an empty body and correct digest
zeroDigest, err := digest.FromTarArchive(bytes.NewReader([]byte{})) zeroDigest, err := digest.FromReader(bytes.NewReader([]byte{}))
if err != nil { if err != nil {
t.Fatalf("unexpected error digesting empty buffer: %v", err) t.Fatalf("unexpected error digesting empty buffer: %v", err)
} }
@ -406,7 +402,7 @@ func testBlobAPI(t *testing.T, env *testEnv, args blobArgs) *testEnv {
// This is a valid but empty tarfile! // This is a valid but empty tarfile!
emptyTar := bytes.Repeat([]byte("\x00"), 1024) emptyTar := bytes.Repeat([]byte("\x00"), 1024)
emptyDigest, err := digest.FromTarArchive(bytes.NewReader(emptyTar)) emptyDigest, err := digest.FromReader(bytes.NewReader(emptyTar))
if err != nil { if err != nil {
t.Fatalf("unexpected error digesting empty tar: %v", err) t.Fatalf("unexpected error digesting empty tar: %v", err)
} }
@ -476,7 +472,7 @@ func testBlobAPI(t *testing.T, env *testEnv, args blobArgs) *testEnv {
// ---------------- // ----------------
// Fetch the layer with an invalid digest // Fetch the layer with an invalid digest
badURL := strings.Replace(layerURL, "tarsum", "trsum", 1) badURL := strings.Replace(layerURL, "sha256", "sha257", 1)
resp, err = http.Get(badURL) resp, err = http.Get(badURL)
if err != nil { if err != nil {
t.Fatalf("unexpected error fetching layer: %v", err) t.Fatalf("unexpected error fetching layer: %v", err)
@ -523,7 +519,7 @@ func testBlobAPI(t *testing.T, env *testEnv, args blobArgs) *testEnv {
checkResponse(t, "fetching layer with invalid etag", resp, http.StatusOK) checkResponse(t, "fetching layer with invalid etag", resp, http.StatusOK)
// Missing tests: // Missing tests:
// - Upload the same tarsum file under and different repository and // - Upload the same tar file under and different repository and
// ensure the content remains uncorrupted. // ensure the content remains uncorrupted.
return env return env
} }
@ -570,7 +566,7 @@ func testBlobDelete(t *testing.T, env *testEnv, args blobArgs) {
// ---------------- // ----------------
// Attempt to delete a layer with an invalid digest // Attempt to delete a layer with an invalid digest
badURL := strings.Replace(layerURL, "tarsum", "trsum", 1) badURL := strings.Replace(layerURL, "sha256", "sha257", 1)
resp, err = httpDelete(badURL) resp, err = httpDelete(badURL)
if err != nil { if err != nil {
t.Fatalf("unexpected error fetching layer: %v", err) t.Fatalf("unexpected error fetching layer: %v", err)
@ -612,12 +608,11 @@ func TestDeleteDisabled(t *testing.T) {
imageName := "foo/bar" imageName := "foo/bar"
// "build" our layer file // "build" our layer file
layerFile, tarSumStr, err := testutil.CreateRandomTarFile() layerFile, layerDigest, err := testutil.CreateRandomTarFile()
if err != nil { if err != nil {
t.Fatalf("error creating random layer file: %v", err) t.Fatalf("error creating random layer file: %v", err)
} }
layerDigest := digest.Digest(tarSumStr)
layerURL, err := env.builder.BuildBlobURL(imageName, layerDigest) layerURL, err := env.builder.BuildBlobURL(imageName, layerDigest)
if err != nil { if err != nil {
t.Fatalf("Error building blob URL") t.Fatalf("Error building blob URL")
@ -638,12 +633,11 @@ func TestDeleteReadOnly(t *testing.T) {
imageName := "foo/bar" imageName := "foo/bar"
// "build" our layer file // "build" our layer file
layerFile, tarSumStr, err := testutil.CreateRandomTarFile() layerFile, layerDigest, err := testutil.CreateRandomTarFile()
if err != nil { if err != nil {
t.Fatalf("error creating random layer file: %v", err) t.Fatalf("error creating random layer file: %v", err)
} }
layerDigest := digest.Digest(tarSumStr)
layerURL, err := env.builder.BuildBlobURL(imageName, layerDigest) layerURL, err := env.builder.BuildBlobURL(imageName, layerDigest)
if err != nil { if err != nil {
t.Fatalf("Error building blob URL") t.Fatalf("Error building blob URL")

7
registry/handlers/app_test.go
View file

@ -102,13 +102,6 @@ func TestAppDispatcher(t *testing.T) {
"name", "foo/bar", "name", "foo/bar",
}, },
}, },
{
endpoint: v2.RouteNameBlob,
vars: []string{
"name", "foo/bar",
"digest", "tarsum.v1+bogus:abcdef0123456789",
},
},
{ {
endpoint: v2.RouteNameBlobUpload, endpoint: v2.RouteNameBlobUpload,
vars: []string{ vars: []string{

13
registry/storage/blob_test.go
View file

@ -20,16 +20,11 @@ import (
// TestSimpleBlobUpload covers the blob upload process, exercising common // TestSimpleBlobUpload covers the blob upload process, exercising common
// error paths that might be seen during an upload. // error paths that might be seen during an upload.
func TestSimpleBlobUpload(t *testing.T) { func TestSimpleBlobUpload(t *testing.T) {
randomDataReader, tarSumStr, err := testutil.CreateRandomTarFile() randomDataReader, dgst, err := testutil.CreateRandomTarFile()
if err != nil { if err != nil {
t.Fatalf("error creating random reader: %v", err) t.Fatalf("error creating random reader: %v", err)
} }
dgst := digest.Digest(tarSumStr)
if err != nil {
t.Fatalf("error allocating upload store: %v", err)
}
ctx := context.Background() ctx := context.Background()
imageName := "foo/bar" imageName := "foo/bar"
driver := inmemory.New() driver := inmemory.New()
@ -225,13 +220,11 @@ func TestSimpleBlobRead(t *testing.T) {
} }
bs := repository.Blobs(ctx) bs := repository.Blobs(ctx)
randomLayerReader, tarSumStr, err := testutil.CreateRandomTarFile() // TODO(stevvooe): Consider using just a random string. randomLayerReader, dgst, err := testutil.CreateRandomTarFile() // TODO(stevvooe): Consider using just a random string.
if err != nil { if err != nil {
t.Fatalf("error creating random data: %v", err) t.Fatalf("error creating random data: %v", err)
} }
dgst := digest.Digest(tarSumStr)
// Test for existence. // Test for existence.
desc, err := bs.Stat(ctx, dgst) desc, err := bs.Stat(ctx, dgst)
if err != distribution.ErrBlobUnknown { if err != distribution.ErrBlobUnknown {
@ -358,7 +351,7 @@ func simpleUpload(t *testing.T, bs distribution.BlobIngester, blob []byte, expec
if dgst != expectedDigest { if dgst != expectedDigest {
// sanity check on zero digest // sanity check on zero digest
t.Fatalf("digest not as expected: %v != %v", dgst, digest.DigestTarSumV1EmptyTar) t.Fatalf("digest not as expected: %v != %v", dgst, expectedDigest)
} }
desc, err := wr.Commit(ctx, distribution.Descriptor{Digest: dgst}) desc, err := wr.Commit(ctx, distribution.Descriptor{Digest: dgst})

2
registry/storage/blobwriter.go
View file

@ -302,7 +302,7 @@ func (bw *blobWriter) moveBlob(ctx context.Context, desc distribution.Descriptor
// get a hash, then the underlying file is deleted, we risk moving // get a hash, then the underlying file is deleted, we risk moving
// a zero-length blob into a nonzero-length blob location. To // a zero-length blob into a nonzero-length blob location. To
// prevent this horrid thing, we employ the hack of only allowing // prevent this horrid thing, we employ the hack of only allowing
// to this happen for the zero tarsum. // to this happen for the digest of an empty tar.
if desc.Digest == digest.DigestSha256EmptyTar { if desc.Digest == digest.DigestSha256EmptyTar {
return bw.blobStore.driver.PutContent(ctx, blobPath, []byte{}) return bw.blobStore.driver.PutContent(ctx, blobPath, []byte{})
} }

2
registry/storage/cache/redis/redis.go vendored
View file

@ -249,7 +249,7 @@ func (rsrbds *repositoryScopedRedisBlobDescriptorService) setDescriptor(ctx cont
} }
// Also set the values for the primary descriptor, if they differ by // Also set the values for the primary descriptor, if they differ by
// algorithm (ie sha256 vs tarsum). // algorithm (ie sha256 vs sha512).
if desc.Digest != "" && dgst != desc.Digest && dgst.Algorithm() != desc.Digest.Algorithm() { if desc.Digest != "" && dgst != desc.Digest && dgst.Algorithm() != desc.Digest.Algorithm() {
if err := rsrbds.setDescriptor(ctx, conn, desc.Digest, desc); err != nil { if err := rsrbds.setDescriptor(ctx, conn, desc.Digest, desc); err != nil {
return err return err

2
registry/storage/linkedblobstore.go
View file

@ -282,7 +282,7 @@ func (lbs *linkedBlobStatter) Stat(ctx context.Context, dgst digest.Digest) (dis
} }
if target != dgst { if target != dgst {
// Track when we are doing cross-digest domain lookups. ie, tarsum to sha256. // Track when we are doing cross-digest domain lookups. ie, sha512 to sha256.
context.GetLogger(ctx).Warnf("looking up blob with canonical target: %v -> %v", dgst, target) context.GetLogger(ctx).Warnf("looking up blob with canonical target: %v -> %v", dgst, target)
} }

23
registry/storage/paths.go
View file

@ -396,9 +396,8 @@ type layerLinkPathSpec struct {
func (layerLinkPathSpec) pathSpec() {} func (layerLinkPathSpec) pathSpec() {}
// blobAlgorithmReplacer does some very simple path sanitization for user // blobAlgorithmReplacer does some very simple path sanitization for user
// input. Mostly, this is to provide some hierarchy for tarsum digests. Paths // input. Paths should be "safe" before getting this far due to strict digest
// should be "safe" before getting this far due to strict digest requirements // requirements but we can add further path conversion here, if needed.
// but we can add further path conversion here, if needed.
var blobAlgorithmReplacer = strings.NewReplacer( var blobAlgorithmReplacer = strings.NewReplacer(
"+", "/", "+", "/",
".", "/", ".", "/",
@ -468,10 +467,6 @@ func (repositoriesRootPathSpec) pathSpec() {}
// //
// <algorithm>/<hex digest> // <algorithm>/<hex digest>
// //
// Most importantly, for tarsum, the layout looks like this:
//
// tarsum/<version>/<digest algorithm>/<full digest>
//
// If multilevel is true, the first two bytes of the digest will separate // If multilevel is true, the first two bytes of the digest will separate
// groups of digest folder. It will be as follows: // groups of digest folder. It will be as follows:
// //
@ -494,19 +489,5 @@ func digestPathComponents(dgst digest.Digest, multilevel bool) ([]string, error)
suffix = append(suffix, hex) suffix = append(suffix, hex)
if tsi, err := digest.ParseTarSum(dgst.String()); err == nil {
// We have a tarsum!
version := tsi.Version
if version == "" {
version = "v0"
}
prefix = []string{
"tarsum",
version,
tsi.Algorithm,
}
}
return append(prefix, suffix...), nil return append(prefix, suffix...), nil
} }

21
registry/storage/paths_test.go
View file

@ -2,8 +2,6 @@ package storage
import ( import (
"testing" "testing"
"github.com/docker/distribution/digest"
) )
func TestPathMapper(t *testing.T) { func TestPathMapper(t *testing.T) {
@ -84,25 +82,6 @@ func TestPathMapper(t *testing.T) {
}, },
expected: "/docker/registry/v2/repositories/foo/bar/_manifests/tags/thetag/index/sha256/abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789/link", expected: "/docker/registry/v2/repositories/foo/bar/_manifests/tags/thetag/index/sha256/abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789/link",
}, },
{
spec: layerLinkPathSpec{
name: "foo/bar",
digest: "tarsum.v1+test:abcdef",
},
expected: "/docker/registry/v2/repositories/foo/bar/_layers/tarsum/v1/test/abcdef/link",
},
{
spec: blobDataPathSpec{
digest: digest.Digest("tarsum.dev+sha512:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"),
},
expected: "/docker/registry/v2/blobs/tarsum/dev/sha512/ab/abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789/data",
},
{
spec: blobDataPathSpec{
digest: digest.Digest("tarsum.v1+sha256:abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789"),
},
expected: "/docker/registry/v2/blobs/tarsum/v1/sha256/ab/abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789/data",
},
{ {
spec: uploadDataPathSpec{ spec: uploadDataPathSpec{

27
testutil/tarfile.go
View file

@ -6,17 +6,16 @@ import (
"crypto/rand" "crypto/rand"
"fmt" "fmt"
"io" "io"
"io/ioutil"
mrand "math/rand" mrand "math/rand"
"time" "time"
"github.com/docker/docker/pkg/tarsum" "github.com/docker/distribution/digest"
) )
// CreateRandomTarFile creates a random tarfile, returning it as an // CreateRandomTarFile creates a random tarfile, returning it as an
// io.ReadSeeker along with its tarsum. An error is returned if there is a // io.ReadSeeker along with its digest. An error is returned if there is a
// problem generating valid content. // problem generating valid content.
func CreateRandomTarFile() (rs io.ReadSeeker, tarSum string, err error) { func CreateRandomTarFile() (rs io.ReadSeeker, dgst digest.Digest, err error) {
nFiles := mrand.Intn(10) + 10 nFiles := mrand.Intn(10) + 10
target := &bytes.Buffer{} target := &bytes.Buffer{}
wr := tar.NewWriter(target) wr := tar.NewWriter(target)
@ -73,23 +72,7 @@ func CreateRandomTarFile() (rs io.ReadSeeker, tarSum string, err error) {
return nil, "", err return nil, "", err
} }
reader := bytes.NewReader(target.Bytes()) dgst = digest.FromBytes(target.Bytes())
// A tar builder that supports tarsum inline calculation would be awesome return bytes.NewReader(target.Bytes()), dgst, nil
// here.
ts, err := tarsum.NewTarSum(reader, true, tarsum.Version1)
if err != nil {
return nil, "", err
}
nn, err := io.Copy(ioutil.Discard, ts)
if nn != int64(len(target.Bytes())) {
return nil, "", fmt.Errorf("short copy when getting tarsum of random layer: %v != %v", nn, len(target.Bytes()))
}
if err != nil {
return nil, "", err
}
return bytes.NewReader(target.Bytes()), ts.Sum(nil), nil
} }