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zot/pkg/extensions/search/common/oci_layout.go
Andrei Aaron 519ea75d9a Implement a way to search for an image by manifest, config or layer digest
```
Usage:
  zot images [config-name] [flags]

Flags:
  -d, --digest string   List images containing a specific manifest, config, or layer digest
[...]
```
2021-06-24 12:15:25 -07:00

152 lines
3.6 KiB
Go

// Package common ...
package common
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"github.com/anuvu/zot/errors"
"github.com/anuvu/zot/pkg/log"
"github.com/anuvu/zot/pkg/storage"
v1 "github.com/google/go-containerregistry/pkg/v1"
godigest "github.com/opencontainers/go-digest"
ispec "github.com/opencontainers/image-spec/specs-go/v1"
)
// CveInfo ...
type OciLayoutUtils struct {
Log log.Logger
StoreController storage.StoreController
}
// NewOciLayoutUtils initializes a new OciLayoutUtils object.
func NewOciLayoutUtils(storeController storage.StoreController, log log.Logger) *OciLayoutUtils {
return &OciLayoutUtils{Log: log, StoreController: storeController}
}
// Below method will return image path including root dir, root dir is determined by splitting.
func (olu OciLayoutUtils) GetImageRepoPath(image string) string {
var rootDir string
prefixName := GetRoutePrefix(image)
subStore := olu.StoreController.SubStore
if subStore != nil {
imgStore, ok := olu.StoreController.SubStore[prefixName]
if ok {
rootDir = imgStore.RootDir()
} else {
rootDir = olu.StoreController.DefaultStore.RootDir()
}
} else {
rootDir = olu.StoreController.DefaultStore.RootDir()
}
return path.Join(rootDir, image)
}
func (olu OciLayoutUtils) GetImageManifests(imagePath string) ([]ispec.Descriptor, error) {
buf, err := ioutil.ReadFile(path.Join(imagePath, "index.json"))
if err != nil {
if os.IsNotExist(err) {
olu.Log.Error().Err(err).Msg("index.json doesn't exist")
return nil, errors.ErrRepoNotFound
}
olu.Log.Error().Err(err).Msg("unable to open index.json")
return nil, errors.ErrRepoNotFound
}
var index ispec.Index
if err := json.Unmarshal(buf, &index); err != nil {
olu.Log.Error().Err(err).Str("dir", imagePath).Msg("invalid JSON")
return nil, errors.ErrRepoNotFound
}
return index.Manifests, nil
}
func (olu OciLayoutUtils) GetImageBlobManifest(imageDir string, digest godigest.Digest) (v1.Manifest, error) {
var blobIndex v1.Manifest
blobBuf, err := ioutil.ReadFile(path.Join(imageDir, "blobs", digest.Algorithm().String(), digest.Encoded()))
if err != nil {
olu.Log.Error().Err(err).Msg("unable to open image metadata file")
return blobIndex, err
}
if err := json.Unmarshal(blobBuf, &blobIndex); err != nil {
olu.Log.Error().Err(err).Msg("unable to marshal blob index")
return blobIndex, err
}
return blobIndex, nil
}
func (olu OciLayoutUtils) GetImageInfo(imageDir string, hash v1.Hash) (ispec.Image, error) {
var imageInfo ispec.Image
blobBuf, err := ioutil.ReadFile(path.Join(imageDir, "blobs", hash.Algorithm, hash.Hex))
if err != nil {
olu.Log.Error().Err(err).Msg("unable to open image layers file")
return imageInfo, err
}
if err := json.Unmarshal(blobBuf, &imageInfo); err != nil {
olu.Log.Error().Err(err).Msg("unable to marshal blob index")
return imageInfo, err
}
return imageInfo, err
}
func GetRoutePrefix(name string) string {
names := strings.SplitN(name, "/", 2)
if len(names) != 2 { // nolint: gomnd
// it means route is of global storage e.g "centos:latest"
if len(names) == 1 {
return "/"
}
}
return fmt.Sprintf("/%s", names[0])
}
func DirExists(d string) bool {
fi, err := os.Stat(d)
if err != nil && os.IsNotExist(err) {
return false
}
return fi.IsDir()
}
func GetImageDirAndTag(imageName string) (string, string) {
var imageDir string
var imageTag string
if strings.Contains(imageName, ":") {
splitImageName := strings.Split(imageName, ":")
imageDir = splitImageName[0]
imageTag = splitImageName[1]
} else {
imageDir = imageName
}
return imageDir, imageTag
}