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
42
43
44
45
46
47
48
49
50
|
package stubs
import (
"context"
"errors"
"github.com/containers/image/v5/internal/signature"
"github.com/opencontainers/go-digest"
)
// NoSignaturesInitialize implements parts of private.ImageDestination
// for transports that don’t support storing signatures.
// See NoSignatures() below.
type NoSignaturesInitialize struct {
message string
}
// NoSignatures creates a NoSignaturesInitialize, failing with message.
func NoSignatures(message string) NoSignaturesInitialize {
return NoSignaturesInitialize{
message: message,
}
}
// SupportsSignatures returns an error (to be displayed to the user) if the destination certainly can't store signatures.
// Note: It is still possible for PutSignatures to fail if SupportsSignatures returns nil.
func (stub NoSignaturesInitialize) SupportsSignatures(ctx context.Context) error {
return errors.New(stub.message)
}
// PutSignaturesWithFormat writes a set of signatures to the destination.
// If instanceDigest is not nil, it contains a digest of the specific manifest instance to write or overwrite the signatures for
// (when the primary manifest is a manifest list); this should always be nil if the primary manifest is not a manifest list.
// MUST be called after PutManifest (signatures may reference manifest contents).
func (stub NoSignaturesInitialize) PutSignaturesWithFormat(ctx context.Context, signatures []signature.Signature, instanceDigest *digest.Digest) error {
if len(signatures) != 0 {
return errors.New(stub.message)
}
return nil
}
// SupportsSignatures implements SupportsSignatures() that returns nil.
// Note that it might be even more useful to return a value dynamically detected based on
type AlwaysSupportsSignatures struct{}
// SupportsSignatures returns an error (to be displayed to the user) if the destination certainly can't store signatures.
// Note: It is still possible for PutSignatures to fail if SupportsSignatures returns nil.
func (stub AlwaysSupportsSignatures) SupportsSignatures(ctx context.Context) error {
return nil
}
|
