client/distribution_inspect.go
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 package client // import "github.com/docker/docker/client"
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 import (
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 	"context"
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 	"encoding/json"
 	"net/url"
 
 	registrytypes "github.com/docker/docker/api/types/registry"
 )
 
 // DistributionInspect returns the image digest with full Manifest
 func (cli *Client) DistributionInspect(ctx context.Context, image, encodedRegistryAuth string) (registrytypes.DistributionInspect, error) {
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 	// Contact the registry to retrieve digest and platform information
 	var distributionInspect registrytypes.DistributionInspect
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 	if image == "" {
 		return distributionInspect, objectNotFoundError{object: "distribution", id: image}
 	}
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 	if err := cli.NewVersionError("1.30", "distribution inspect"); err != nil {
 		return distributionInspect, err
 	}
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 	var headers map[string][]string
 
 	if encodedRegistryAuth != "" {
 		headers = map[string][]string{
 			"X-Registry-Auth": {encodedRegistryAuth},
 		}
 	}
 
 	resp, err := cli.get(ctx, "/distribution/"+image+"/json", url.Values{}, headers)
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 	defer ensureReaderClosed(resp)
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 	if err != nil {
 		return distributionInspect, err
 	}
 
 	err = json.NewDecoder(resp.body).Decode(&distributionInspect)
 	return distributionInspect, err
 }