distribution/docs/storage/layer_test.go

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package storage
import (
"bytes"
"crypto/sha256"
"fmt"
"io"
"io/ioutil"
"os"
"testing"
"github.com/docker/distribution"
"github.com/docker/distribution/digest"
storagedriver "github.com/docker/distribution/registry/storage/driver"
"github.com/docker/distribution/registry/storage/driver/inmemory"
"github.com/docker/distribution/testutil"
"golang.org/x/net/context"
)
// TestSimpleLayerUpload covers the layer upload process, exercising common
// error paths that might be seen during an upload.
func TestSimpleLayerUpload(t *testing.T) {
randomDataReader, tarSumStr, err := testutil.CreateRandomTarFile()
if err != nil {
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()
imageName := "foo/bar"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
repository, err := registry.Repository(ctx, imageName)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ls := repository.Layers()
h := sha256.New()
rd := io.TeeReader(randomDataReader, h)
layerUpload, err := ls.Upload()
if err != nil {
t.Fatalf("unexpected error starting layer upload: %s", err)
}
// Cancel the upload then restart it
if err := layerUpload.Cancel(); err != nil {
t.Fatalf("unexpected error during upload cancellation: %v", err)
}
// Do a resume, get unknown upload
layerUpload, err = ls.Resume(layerUpload.UUID())
if err != distribution.ErrLayerUploadUnknown {
t.Fatalf("unexpected error resuming upload, should be unkown: %v", err)
}
// Restart!
layerUpload, err = ls.Upload()
if err != nil {
t.Fatalf("unexpected error starting layer upload: %s", err)
}
// Get the size of our random tarfile
randomDataSize, err := seekerSize(randomDataReader)
if err != nil {
t.Fatalf("error getting seeker size of random data: %v", err)
}
nn, err := io.Copy(layerUpload, rd)
if err != nil {
t.Fatalf("unexpected error uploading layer data: %v", err)
}
if nn != randomDataSize {
t.Fatalf("layer data write incomplete")
}
offset, err := layerUpload.Seek(0, os.SEEK_CUR)
if err != nil {
t.Fatalf("unexpected error seeking layer upload: %v", err)
}
if offset != nn {
t.Fatalf("layerUpload not updated with correct offset: %v != %v", offset, nn)
}
layerUpload.Close()
// Do a resume, for good fun
layerUpload, err = ls.Resume(layerUpload.UUID())
if err != nil {
t.Fatalf("unexpected error resuming upload: %v", err)
}
sha256Digest := digest.NewDigest("sha256", h)
layer, err := layerUpload.Finish(dgst)
if err != nil {
t.Fatalf("unexpected error finishing layer upload: %v", err)
}
// After finishing an upload, it should no longer exist.
if _, err := ls.Resume(layerUpload.UUID()); err != distribution.ErrLayerUploadUnknown {
t.Fatalf("expected layer upload to be unknown, got %v", err)
}
// Test for existence.
exists, err := ls.Exists(layer.Digest())
if err != nil {
t.Fatalf("unexpected error checking for existence: %v", err)
}
if !exists {
t.Fatalf("layer should now exist")
}
h.Reset()
nn, err = io.Copy(h, layer)
if err != nil {
t.Fatalf("error reading layer: %v", err)
}
if nn != randomDataSize {
t.Fatalf("incorrect read length")
}
if digest.NewDigest("sha256", h) != sha256Digest {
t.Fatalf("unexpected digest from uploaded layer: %q != %q", digest.NewDigest("sha256", h), sha256Digest)
}
}
// TestSimpleLayerRead just creates a simple layer file and ensures that basic
// open, read, seek, read works. More specific edge cases should be covered in
// other tests.
func TestSimpleLayerRead(t *testing.T) {
ctx := context.Background()
imageName := "foo/bar"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
repository, err := registry.Repository(ctx, imageName)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ls := repository.Layers()
randomLayerReader, tarSumStr, err := testutil.CreateRandomTarFile()
if err != nil {
t.Fatalf("error creating random data: %v", err)
}
dgst := digest.Digest(tarSumStr)
// Test for existence.
exists, err := ls.Exists(dgst)
if err != nil {
t.Fatalf("unexpected error checking for existence: %v", err)
}
if exists {
t.Fatalf("layer should not exist")
}
// Try to get the layer and make sure we get a not found error
layer, err := ls.Fetch(dgst)
if err == nil {
t.Fatalf("error expected fetching unknown layer")
}
switch err.(type) {
case distribution.ErrUnknownLayer:
err = nil
default:
t.Fatalf("unexpected error fetching non-existent layer: %v", err)
}
randomLayerDigest, err := writeTestLayer(driver, ls.(*layerStore).repository.pm, imageName, dgst, randomLayerReader)
if err != nil {
t.Fatalf("unexpected error writing test layer: %v", err)
}
randomLayerSize, err := seekerSize(randomLayerReader)
if err != nil {
t.Fatalf("error getting seeker size for random layer: %v", err)
}
layer, err = ls.Fetch(dgst)
if err != nil {
t.Fatal(err)
}
defer layer.Close()
// Now check the sha digest and ensure its the same
h := sha256.New()
nn, err := io.Copy(h, layer)
if err != nil && err != io.EOF {
t.Fatalf("unexpected error copying to hash: %v", err)
}
if nn != randomLayerSize {
t.Fatalf("stored incorrect number of bytes in layer: %d != %d", nn, randomLayerSize)
}
sha256Digest := digest.NewDigest("sha256", h)
if sha256Digest != randomLayerDigest {
t.Fatalf("fetched digest does not match: %q != %q", sha256Digest, randomLayerDigest)
}
// Now seek back the layer, read the whole thing and check against randomLayerData
offset, err := layer.Seek(0, os.SEEK_SET)
if err != nil {
t.Fatalf("error seeking layer: %v", err)
}
if offset != 0 {
t.Fatalf("seek failed: expected 0 offset, got %d", offset)
}
p, err := ioutil.ReadAll(layer)
if err != nil {
t.Fatalf("error reading all of layer: %v", err)
}
if len(p) != int(randomLayerSize) {
t.Fatalf("layer data read has different length: %v != %v", len(p), randomLayerSize)
}
// Reset the randomLayerReader and read back the buffer
_, err = randomLayerReader.Seek(0, os.SEEK_SET)
if err != nil {
t.Fatalf("error resetting layer reader: %v", err)
}
randomLayerData, err := ioutil.ReadAll(randomLayerReader)
if err != nil {
t.Fatalf("random layer read failed: %v", err)
}
if !bytes.Equal(p, randomLayerData) {
t.Fatalf("layer data not equal")
}
}
// TestLayerUploadZeroLength uploads zero-length
func TestLayerUploadZeroLength(t *testing.T) {
ctx := context.Background()
imageName := "foo/bar"
driver := inmemory.New()
registry := NewRegistryWithDriver(driver)
repository, err := registry.Repository(ctx, imageName)
if err != nil {
t.Fatalf("unexpected error getting repo: %v", err)
}
ls := repository.Layers()
upload, err := ls.Upload()
if err != nil {
t.Fatalf("unexpected error starting upload: %v", err)
}
io.Copy(upload, bytes.NewReader([]byte{}))
dgst, err := digest.FromReader(bytes.NewReader([]byte{}))
if err != nil {
t.Fatalf("error getting zero digest: %v", err)
}
if dgst != digest.DigestSha256EmptyTar {
// sanity check on zero digest
t.Fatalf("digest not as expected: %v != %v", dgst, digest.DigestTarSumV1EmptyTar)
}
layer, err := upload.Finish(dgst)
if err != nil {
t.Fatalf("unexpected error finishing upload: %v", err)
}
if layer.Digest() != dgst {
t.Fatalf("unexpected digest: %v != %v", layer.Digest(), dgst)
}
}
// writeRandomLayer creates a random layer under name and tarSum using driver
// and pathMapper. An io.ReadSeeker with the data is returned, along with the
// sha256 hex digest.
func writeRandomLayer(driver storagedriver.StorageDriver, pathMapper *pathMapper, name string) (rs io.ReadSeeker, tarSum digest.Digest, sha256digest digest.Digest, err error) {
reader, tarSumStr, err := testutil.CreateRandomTarFile()
if err != nil {
return nil, "", "", err
}
tarSum = digest.Digest(tarSumStr)
// Now, actually create the layer.
randomLayerDigest, err := writeTestLayer(driver, pathMapper, name, tarSum, ioutil.NopCloser(reader))
if _, err := reader.Seek(0, os.SEEK_SET); err != nil {
return nil, "", "", err
}
return reader, tarSum, randomLayerDigest, err
}
// seekerSize seeks to the end of seeker, checks the size and returns it to
// the original state, returning the size. The state of the seeker should be
// treated as unknown if an error is returned.
func seekerSize(seeker io.ReadSeeker) (int64, error) {
current, err := seeker.Seek(0, os.SEEK_CUR)
if err != nil {
return 0, err
}
end, err := seeker.Seek(0, os.SEEK_END)
if err != nil {
return 0, err
}
resumed, err := seeker.Seek(current, os.SEEK_SET)
if err != nil {
return 0, err
}
if resumed != current {
return 0, fmt.Errorf("error returning seeker to original state, could not seek back to original location")
}
return end, nil
}
// createTestLayer creates a simple test layer in the provided driver under
// tarsum dgst, returning the sha256 digest location. This is implemented
// peicemeal and should probably be replaced by the uploader when it's ready.
func writeTestLayer(driver storagedriver.StorageDriver, pathMapper *pathMapper, name string, dgst digest.Digest, content io.Reader) (digest.Digest, error) {
h := sha256.New()
rd := io.TeeReader(content, h)
p, err := ioutil.ReadAll(rd)
if err != nil {
return "", nil
}
blobDigestSHA := digest.NewDigest("sha256", h)
blobPath, err := pathMapper.path(blobDataPathSpec{
digest: dgst,
})
if err := driver.PutContent(blobPath, p); err != nil {
return "", err
}
if err != nil {
return "", err
}
layerLinkPath, err := pathMapper.path(layerLinkPathSpec{
name: name,
digest: dgst,
})
if err != nil {
return "", err
}
if err := driver.PutContent(layerLinkPath, []byte(dgst)); err != nil {
return "", nil
}
return blobDigestSHA, err
}