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feat(*): add digest to invocation image on build
resolves cnabio#690
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Michelle Noorali
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Apr 5, 2019
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,42 @@ | ||
package digester | ||
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import ( | ||
"golang.org/x/net/context" | ||
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"github.com/docker/docker/client" | ||
"github.com/opencontainers/go-digest" | ||
) | ||
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type Digester struct { | ||
Client client.ImageAPIClient | ||
Image string | ||
Context context.Context | ||
} | ||
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// NewDigester returns a Digester given the args client, image, ctx | ||
// | ||
// ctx is context to use and pass to Docker client | ||
// client allows us to talk to the Docker client | ||
// image is a string identifier of the image we want to compute digest of | ||
func NewDigester(ctx context.Context, client client.ImageAPIClient, image string) *Digester { | ||
return &Digester{ | ||
Client: client, | ||
Image: image, | ||
Context: ctx, | ||
} | ||
} | ||
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// Digest returns the digest of the image tar | ||
func (d *Digester) Digest() (string, error) { | ||
reader, err := d.Client.ImageSave(d.Context, []string{d.Image}) | ||
if err != nil { | ||
return "", err | ||
} | ||
computedDigest, err := digest.Canonical.FromReader(reader) | ||
if err != nil { | ||
return "", err | ||
} | ||
defer reader.Close() | ||
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return computedDigest.String(), nil | ||
} |
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