func findManifest(r io.Reader) ([]byte, error) {
arch, err := tarhelper.DetectArchiveCompression(r)
if err != nil {
return nil, err
}
for {
header, err := arch.Next()
if err == io.EOF {
return nil, fmt.Errorf("failed to locate manifest file")
}
if err != nil {
return nil, err
}
if filepath.Clean(header.Name) != "manifest" {
continue
}
b, err := ioutil.ReadAll(arch)
if err != nil {
return nil, err
}
return b, nil
}
}
// findManifest retrieves the manifest from the provided reader and unmarshals
// it.
func findManifest(r io.Reader) (*schema.ImageManifest, error) {
arch, err := tarhelper.DetectArchiveCompression(r)
if err != nil {
return nil, err
}
for {
header, err := arch.Next()
if err == io.EOF {
return nil, fmt.Errorf("failed to locate manifest file")
}
if err != nil {
return nil, err
}
if filepath.Clean(header.Name) != "manifest" {
continue
}
var manifest *schema.ImageManifest
if err := json.NewDecoder(arch).Decode(&manifest); err != nil {
return nil, err
}
return manifest, nil
}
}