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contrib: only extract layers from history

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This tool was written before v2 existed and deduplicated and listed
layers out of order in their manifests.
This commit is contained in:
Jimmy Zelinskie 2017-04-19 16:23:23 -04:00
parent f3848d9726
commit e772be5f6f
1 changed files with 2 additions and 32 deletions
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30
contrib/analyze-local-images/main.go
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@ -154,10 +154,7 @@ func AnalyzeLocalImage(imageName string, minSeverity types.Priority, endpoint, m
// Retrieve history. // Retrieve history.
log.Println("Retrieving image history") log.Println("Retrieving image history")
layerIDs, err := historyFromManifest(tmpPath)
if err != nil {
layerIDs, err = historyFromCommand(imageName) layerIDs, err = historyFromCommand(imageName)
}
if err != nil || len(layerIDs) == 0 { if err != nil || len(layerIDs) == 0 {
return fmt.Errorf("Could not get image's history: %s", err) return fmt.Errorf("Could not get image's history: %s", err)
} }
@ -309,33 +306,6 @@ func save(imageName, path string) error {
return nil return nil
} }
func historyFromManifest(path string) ([]string, error) {
mf, err := os.Open(path + "/manifest.json")
if err != nil {
return nil, err
}
defer mf.Close()
// https://github.com/docker/docker/blob/master/image/tarexport/tarexport.go#L17
type manifestItem struct {
Config string
RepoTags []string
Layers []string
}
var manifest []manifestItem
if err = json.NewDecoder(mf).Decode(&manifest); err != nil {
return nil, err
} else if len(manifest) != 1 {
return nil, err
}
var layers []string
for _, layer := range manifest[0].Layers {
layers = append(layers, strings.TrimSuffix(layer, "/layer.tar"))
}
return layers, nil
}
func historyFromCommand(imageName string) ([]string, error) { func historyFromCommand(imageName string) ([]string, error) {
var stderr bytes.Buffer var stderr bytes.Buffer
cmd := exec.Command("docker", "history", "-q", "--no-trunc", imageName) cmd := exec.Command("docker", "history", "-q", "--no-trunc", imageName)