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Merge pull request #1102 from giuseppe/zstd-chunked-support-sparse-files
pkg/chunked: add support for sparse files
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| package chunked | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
| "reflect" | ||
| "testing" | ||
| ) | ||
|
|
||
| const jsonTOC = ` | ||
| { | ||
| "version": 1, | ||
| "entries": [ | ||
| { | ||
| "type": "symlink", | ||
| "name": "bin", | ||
| "linkName": "usr/bin", | ||
| "mode": 511, | ||
| "modtime": "1970-01-01T01:00:00+01:00", | ||
| "accesstime": "0001-01-01T00:00:00Z", | ||
| "changetime": "0001-01-01T00:00:00Z" | ||
| }, | ||
| { | ||
| "type": "dir", | ||
| "name": "usr/bin", | ||
| "mode": 511, | ||
| "modtime": "2022-01-07T12:36:43+01:00", | ||
| "accesstime": "0001-01-01T00:00:00Z", | ||
| "changetime": "0001-01-01T00:00:00Z" | ||
| }, | ||
| { | ||
| "type": "reg", | ||
| "name": "usr/bin/foo", | ||
| "mode": 511, | ||
| "size": 103867, | ||
| "modtime": "1970-01-01T01:00:00+01:00", | ||
| "accesstime": "0001-01-01T00:00:00Z", | ||
| "changetime": "0001-01-01T00:00:00Z", | ||
| "digest": "sha256:99fe908c699dc068438b23e28319cadff1f2153c3043bafb8e83a430bba0a2c6", | ||
| "offset": 94149, | ||
| "endOffset": 120135, | ||
| "chunkSize": 17615, | ||
| "chunkDigest": "sha256:2ce0d0f8eb2aa93d13007097763e4459c814c8d0e859e5a57465af924169b544" | ||
| }, | ||
| { | ||
| "type": "chunk", | ||
| "name": "usr/bin/foo", | ||
| "offset": 99939, | ||
| "chunkSize": 86252, | ||
| "chunkOffset": 17615, | ||
| "chunkDigest": "sha256:2a9d3f1b6b37abc8bb35eb8fa98b893a2a2447bcb01184c3bafc8c6b40da099d" | ||
| } | ||
| } | ||
| ` | ||
|
|
||
| func TestPrepareMetadata(t *testing.T) { | ||
| toc, err := prepareMetadata([]byte(jsonTOC)) | ||
| if err != nil { | ||
| t.Errorf("got error from prepareMetadata: %w", err) | ||
| } | ||
| if len(toc) != 2 { | ||
| t.Error("prepareMetadata returns the wrong length") | ||
| } | ||
| } | ||
|
|
||
| type bigDataToBuffer struct { | ||
| buf *bytes.Buffer | ||
| id string | ||
| key string | ||
| called bool | ||
| } | ||
|
|
||
| func (b *bigDataToBuffer) SetLayerBigData(id, key string, data io.Reader) error { | ||
| b.id = id | ||
| b.key = key | ||
| if b.called { | ||
| return fmt.Errorf("SetLayerBigData already called once") | ||
| } | ||
| b.called = true | ||
| _, err := io.Copy(b.buf, data) | ||
| return err | ||
| } | ||
|
|
||
| func TestWriteCache(t *testing.T) { | ||
| toc, err := prepareMetadata([]byte(jsonTOC)) | ||
| if err != nil { | ||
| t.Errorf("got error from prepareMetadata: %w", err) | ||
| } | ||
|
|
||
| dest := bigDataToBuffer{ | ||
| buf: bytes.NewBuffer(nil), | ||
| } | ||
| cache, err := writeCache([]byte(jsonTOC), "foobar", &dest) | ||
| if err != nil { | ||
| t.Errorf("got error from writeCache: %w", err) | ||
| } | ||
| if digest, _, _ := findTag("foobar", cache); digest != "" { | ||
| t.Error("found invalid tag") | ||
| } | ||
|
|
||
| for _, r := range toc { | ||
| if r.Digest != "" { | ||
| // find the element in the cache by the digest checksum | ||
| digest, off, len := findTag(r.Digest, cache) | ||
| if digest == "" { | ||
| t.Error("file tag not found") | ||
| } | ||
| if digest != r.Digest { | ||
| t.Error("wrong file found") | ||
| } | ||
| expectedLocation := generateFileLocation(r.Name, 0) | ||
| location := cache.vdata[off : off+len] | ||
| if !bytes.Equal(location, expectedLocation) { | ||
| t.Errorf("wrong file found %q instead of %q", location, expectedLocation) | ||
| } | ||
|
|
||
| fingerprint, err := calculateHardLinkFingerprint(r) | ||
| if err != nil { | ||
| t.Errorf("got error from writeCache: %w", err) | ||
| } | ||
|
|
||
| // find the element in the cache by the hardlink fingerprint | ||
| digest, off, len = findTag(fingerprint, cache) | ||
| if digest == "" { | ||
| t.Error("file tag not found") | ||
| } | ||
| if digest != fingerprint { | ||
| t.Error("wrong file found") | ||
| } | ||
| expectedLocation = generateFileLocation(r.Name, 0) | ||
| location = cache.vdata[off : off+len] | ||
| if !bytes.Equal(location, expectedLocation) { | ||
| t.Errorf("wrong file found %q instead of %q", location, expectedLocation) | ||
| } | ||
| } | ||
| if r.ChunkDigest != "" { | ||
| // find the element in the cache by the chunk digest checksum | ||
| digest, off, len := findTag(r.ChunkDigest, cache) | ||
| if digest == "" { | ||
| t.Error("chunk tag not found") | ||
| } | ||
| if digest != r.ChunkDigest { | ||
| t.Error("wrong digest found") | ||
| } | ||
| expectedLocation := generateFileLocation(r.Name, uint64(r.ChunkOffset)) | ||
| location := cache.vdata[off : off+len] | ||
| if !bytes.Equal(location, expectedLocation) { | ||
| t.Errorf("wrong file found %q instead of %q", location, expectedLocation) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func TestReadCache(t *testing.T) { | ||
| dest := bigDataToBuffer{ | ||
| buf: bytes.NewBuffer(nil), | ||
| } | ||
| cache, err := writeCache([]byte(jsonTOC), "foobar", &dest) | ||
| if err != nil { | ||
| t.Errorf("got error from writeCache: %w", err) | ||
| } | ||
|
|
||
| cacheRead, err := readMetadataFromCache(dest.buf) | ||
| if err != nil { | ||
| t.Errorf("got error from readMetadataFromCache: %w", err) | ||
| } | ||
| if !reflect.DeepEqual(cache, cacheRead) { | ||
| t.Errorf("read a different struct than what was written") | ||
| } | ||
| } |
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