/
layout.go
105 lines (85 loc) · 2.49 KB
/
layout.go
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// Copyright 2016 The Linux Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package image
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/opencontainers/image-spec/schema"
"github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
func layoutValidate(w walker) error {
var blobsExist, indexExist, layoutExist bool
if err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if strings.EqualFold(filepath.Base(path), "blobs") {
blobsExist = true
if !info.IsDir() {
return fmt.Errorf("blobs is not a directory")
}
return nil
}
if strings.EqualFold(filepath.Base(path), "index.json") {
indexExist = true
if info.IsDir() {
return fmt.Errorf("index.json is a directory")
}
var index v1.Index
buf, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrap(err, "error reading index.json")
}
if err := json.Unmarshal(buf, &index); err != nil {
return errors.Wrap(err, "index.json format mismatch")
}
return nil
}
if strings.EqualFold(filepath.Base(path), "oci-layout") {
layoutExist = true
if info.IsDir() {
return fmt.Errorf("oci-layout is a directory")
}
var imageLayout v1.ImageLayout
buf, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrap(err, "error reading oci-layout")
}
if err := schema.ValidatorMediaTypeLayoutHeader.Validate(bytes.NewReader(buf)); err != nil {
return errors.Wrap(err, "oci-layout: imageLayout validation failed")
}
if err := json.Unmarshal(buf, &imageLayout); err != nil {
return errors.Wrap(err, "oci-layout format mismatch")
}
return nil
}
return nil
}); err != nil {
return err
}
if !blobsExist {
return fmt.Errorf("image layout must contain blobs directory")
}
if !indexExist {
return fmt.Errorf("image layout must contain index.json file")
}
if !layoutExist {
return fmt.Errorf("image layout must contain oci-layout file")
}
return nil
}