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refactor image preprocessing (still draft)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,266 @@ | ||
| package image | ||
|
|
||
| import ( | ||
| "archive/tar" | ||
| "encoding/json" | ||
| "fmt" | ||
| "github.com/docker/docker/client" | ||
| "github.com/sirupsen/logrus" | ||
| "io" | ||
| "strings" | ||
| "github.com/wagoodman/dive/filetree" | ||
| "github.com/wagoodman/dive/utils" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| var dockerVersion string | ||
|
|
||
| func check(e error) { | ||
| if e != nil { | ||
| panic(e) | ||
| } | ||
| } | ||
|
|
||
| func newDockerImageAnalyzer() Analyzer { | ||
| return &dockerImageAnalyzer{ | ||
| } | ||
| } | ||
|
|
||
| func newDockerImageManifest(manifestBytes []byte) dockerImageManifest { | ||
| var manifest []dockerImageManifest | ||
| err := json.Unmarshal(manifestBytes, &manifest) | ||
| if err != nil { | ||
| logrus.Panic(err) | ||
| } | ||
| return manifest[0] | ||
| } | ||
|
|
||
| func newDockerImageConfig(configBytes []byte) dockerImageConfig { | ||
| var imageConfig dockerImageConfig | ||
| err := json.Unmarshal(configBytes, &imageConfig) | ||
| if err != nil { | ||
| logrus.Panic(err) | ||
| } | ||
|
|
||
| layerIdx := 0 | ||
| for idx := range imageConfig.History { | ||
| if imageConfig.History[idx].EmptyLayer { | ||
| imageConfig.History[idx].ID = "<missing>" | ||
| } else { | ||
| imageConfig.History[idx].ID = imageConfig.RootFs.DiffIds[layerIdx] | ||
| layerIdx++ | ||
| } | ||
| } | ||
|
|
||
| return imageConfig | ||
| } | ||
|
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||
|
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| func (image *dockerImageAnalyzer) Parse(imageID string) error { | ||
| var err error | ||
| image.id = imageID | ||
| // store discovered json files in a map so we can read the image in one pass | ||
| image.jsonFiles = make(map[string][]byte) | ||
| image.layerMap = make(map[string]*filetree.FileTree) | ||
|
|
||
| // pull the image if it does not exist | ||
| ctx := context.Background() | ||
| image.client, err = client.NewClientWithOpts(client.WithVersion(dockerVersion), client.FromEnv) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| _, _, err = image.client.ImageInspectWithRaw(ctx, imageID) | ||
| if err != nil { | ||
| // don't use the API, the CLI has more informative output | ||
| fmt.Println("Image not available locally. Trying to pull '" + imageID + "'...") | ||
| utils.RunDockerCmd("pull", imageID) | ||
| } | ||
|
|
||
| tarFile, _, err := image.getReader(imageID) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer tarFile.Close() | ||
|
|
||
| err = image.read(tarFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
|
|
||
| // todo: it is bad that this is printing out to the screen | ||
| func (image *dockerImageAnalyzer) read(tarFile io.ReadCloser) error { | ||
| tarReader := tar.NewReader(tarFile) | ||
|
|
||
| var currentLayer uint | ||
| for { | ||
| header, err := tarReader.Next() | ||
|
|
||
| if err == io.EOF { | ||
| fmt.Println(" ╧") | ||
| break | ||
| } | ||
|
|
||
| if err != nil { | ||
| fmt.Println(err) | ||
| utils.Exit(1) | ||
| } | ||
|
|
||
| layerProgress := fmt.Sprintf("[layer: %2d]", currentLayer) | ||
|
|
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| name := header.Name | ||
| var n int | ||
|
|
||
| // some layer tars can be relative layer symlinks to other layer tars | ||
| if header.Typeflag == tar.TypeSymlink || header.Typeflag == tar.TypeReg { | ||
|
|
||
| if strings.HasSuffix(name, "layer.tar") { | ||
| currentLayer++ | ||
| if err != nil { | ||
| logrus.Panic(err) | ||
| } | ||
| message := fmt.Sprintf(" ├─ %s %s ", layerProgress, "working...") | ||
| fmt.Printf("\r%s", message) | ||
|
|
||
| layerReader := tar.NewReader(tarReader) | ||
| image.processLayerTar(name, layerReader, layerProgress) | ||
| } else if strings.HasSuffix(name, ".json") { | ||
| var fileBuffer = make([]byte, header.Size) | ||
| n, err = tarReader.Read(fileBuffer) | ||
| if err != nil && err != io.EOF || int64(n) != header.Size { | ||
| return err | ||
| } | ||
| image.jsonFiles[name] = fileBuffer | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (image *dockerImageAnalyzer) Analyze() (*AnalysisResult, error) { | ||
| image.trees = make([]*filetree.FileTree, 0) | ||
|
|
||
| manifest := newDockerImageManifest(image.jsonFiles["manifest.json"]) | ||
| config := newDockerImageConfig(image.jsonFiles[manifest.ConfigPath]) | ||
|
|
||
| // build the content tree | ||
| for _, treeName := range manifest.LayerTarPaths { | ||
| image.trees = append(image.trees, image.layerMap[treeName]) | ||
| } | ||
|
|
||
| // build the layers array | ||
| image.layers = make([]*dockerLayer, len(image.trees)) | ||
|
|
||
| // note that the image config stores images in reverse chronological order, so iterate backwards through layers | ||
| // as you iterate chronologically through history (ignoring history items that have no layer contents) | ||
| layerIdx := len(image.trees) - 1 | ||
| tarPathIdx := 0 | ||
| for idx := 0; idx < len(config.History); idx++ { | ||
| // ignore empty layers, we are only observing layers with content | ||
| if config.History[idx].EmptyLayer { | ||
| continue | ||
| } | ||
|
|
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| tree := image.trees[(len(image.trees)-1)-layerIdx] | ||
| config.History[idx].Size = uint64(tree.FileSize) | ||
|
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| image.layers[layerIdx] = &dockerLayer{ | ||
| history: config.History[idx], | ||
| index: layerIdx, | ||
| tree: image.trees[layerIdx], | ||
| tarPath: manifest.LayerTarPaths[tarPathIdx], | ||
| } | ||
|
|
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| layerIdx-- | ||
| tarPathIdx++ | ||
| } | ||
|
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||
|
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| efficiency, inefficiencies := filetree.Efficiency(image.trees) | ||
|
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| layers := make([]Layer, len(image.layers)) | ||
| for i, v := range image.layers { | ||
| layers[i] = v | ||
| } | ||
|
|
||
| return &AnalysisResult{ | ||
| Layers: layers, | ||
| RefTrees: image.trees, | ||
| Efficiency: efficiency, | ||
| Inefficiencies: inefficiencies, | ||
| }, nil | ||
| } | ||
|
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||
|
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| func (image *dockerImageAnalyzer) getReader(imageID string) (io.ReadCloser, int64, error) { | ||
|
|
||
| ctx := context.Background() | ||
| result, _, err := image.client.ImageInspectWithRaw(ctx, imageID) | ||
| if err != nil { | ||
| return nil, -1, err | ||
| } | ||
| totalSize := result.Size | ||
|
|
||
| readCloser, err := image.client.ImageSave(ctx, []string{imageID}) | ||
| check(err) | ||
|
|
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| return readCloser, totalSize, nil | ||
| } | ||
|
|
||
| // todo: it is bad that this is printing out to the screen | ||
| func (image *dockerImageAnalyzer) processLayerTar(name string, reader *tar.Reader, layerProgress string) { | ||
| tree := filetree.NewFileTree() | ||
| tree.Name = name | ||
|
|
||
| fileInfos := image.getFileList(reader) | ||
|
|
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| shortName := name[:15] | ||
| pb := utils.NewProgressBar(int64(len(fileInfos)), 30) | ||
| for idx, element := range fileInfos { | ||
| tree.FileSize += uint64(element.TarHeader.FileInfo().Size()) | ||
| tree.AddPath(element.Path, element) | ||
|
|
||
| if pb.Update(int64(idx)) { | ||
| message := fmt.Sprintf(" ├─ %s %s : %s", layerProgress, shortName, pb.String()) | ||
| fmt.Printf("\r%s", message) | ||
| } | ||
| } | ||
| pb.Done() | ||
| message := fmt.Sprintf(" ├─ %s %s : %s", layerProgress, shortName, pb.String()) | ||
| fmt.Printf("\r%s\n", message) | ||
|
|
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| image.layerMap[tree.Name] = tree | ||
| } | ||
|
|
||
| // todo: it is bad that this is printing out to the screen | ||
| func (image *dockerImageAnalyzer) getFileList(tarReader *tar.Reader) []filetree.FileInfo { | ||
| var files []filetree.FileInfo | ||
|
|
||
| for { | ||
| header, err := tarReader.Next() | ||
|
|
||
| if err == io.EOF { | ||
| break | ||
| } | ||
|
|
||
| if err != nil { | ||
| fmt.Println(err) | ||
| utils.Exit(1) | ||
| } | ||
|
|
||
| name := header.Name | ||
|
|
||
| switch header.Typeflag { | ||
| case tar.TypeXGlobalHeader: | ||
| fmt.Printf("ERRG: XGlobalHeader: %v: %s\n", header.Typeflag, name) | ||
| case tar.TypeXHeader: | ||
| fmt.Printf("ERRG: XHeader: %v: %s\n", header.Typeflag, name) | ||
| default: | ||
| files = append(files, filetree.NewFileInfo(tarReader, header, name)) | ||
| } | ||
| } | ||
| return files | ||
| } |
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