-
Notifications
You must be signed in to change notification settings - Fork 514
/
walk.go
41 lines (36 loc) · 1.45 KB
/
walk.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
//
// Copyright 2021 The Sigstore Authors.
//
// 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 walk
import (
"context"
"github.com/sigstore/cosign/pkg/oci"
"github.com/sigstore/cosign/pkg/oci/mutate"
)
// Fn is the signature of the callback supplied to SignedEntity.
// The oci.SignedEntity is either an oci.SignedImageIndex or an oci.SignedImage.
// This callback is called on oci.SignedImageIndex *before* its children.
type Fn func(context.Context, oci.SignedEntity) error
// SignedEntity calls `fn` on the signed entity and each of its constituent entities
// (`SignedImageIndex` or `SignedImage`) transitively.
// Any errors returned by an `fn` are returned by `Walk`.
func SignedEntity(ctx context.Context, parent oci.SignedEntity, fn Fn) error {
_, err := mutate.Map(ctx, parent, func(ctx context.Context, se oci.SignedEntity) (oci.SignedEntity, error) {
if err := fn(ctx, se); err != nil {
return nil, err
}
return se, nil
})
return err
}