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b3098b338e
This is just the minimal update: the gofmt-created updates have been reviewed and edited to preserve original semantic intent, but I didn't review all existing comments to benefit from the new syntax. Signed-off-by: Miloslav Trmač <mitr@redhat.com>
56 lines
1.9 KiB
Go
56 lines
1.9 KiB
Go
package impl
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import (
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"context"
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"github.com/containers/image/v5/internal/private"
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"github.com/containers/image/v5/internal/signature"
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"github.com/opencontainers/go-digest"
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)
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// Compat implements the obsolete parts of types.ImageSource
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// for implementations of private.ImageSource.
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// See AddCompat below.
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type Compat struct {
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src private.ImageSourceInternalOnly
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}
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// AddCompat initializes Compat to implement the obsolete parts of types.ImageSource
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// for implementations of private.ImageSource.
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//
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// Use it like this:
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//
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// type yourSource struct {
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// impl.Compat
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// …
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// }
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//
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// src := &yourSource{…}
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// src.Compat = impl.AddCompat(src)
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func AddCompat(src private.ImageSourceInternalOnly) Compat {
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return Compat{src}
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}
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// GetSignatures returns the image's signatures. It may use a remote (= slow) service.
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// If instanceDigest is not nil, it contains a digest of the specific manifest instance to retrieve signatures for
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// (when the primary manifest is a manifest list); this never happens if the primary manifest is not a manifest list
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// (e.g. if the source never returns manifest lists).
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func (c *Compat) GetSignatures(ctx context.Context, instanceDigest *digest.Digest) ([][]byte, error) {
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// Silently ignore signatures with other formats; the caller can’t handle them.
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// Admittedly callers that want to sync all of the image might want to fail instead; this
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// way an upgrade of c/image neither breaks them nor adds new functionality.
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// Alternatively, we could possibly define the old GetSignatures to use the multi-format
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// signature.Blob representation now, in general, but that could silently break them as well.
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sigs, err := c.src.GetSignaturesWithFormat(ctx, instanceDigest)
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if err != nil {
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return nil, err
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}
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simpleSigs := [][]byte{}
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for _, sig := range sigs {
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if sig, ok := sig.(signature.SimpleSigning); ok {
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simpleSigs = append(simpleSigs, sig.UntrustedSignature())
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}
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}
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return simpleSigs, nil
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}
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