istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/util/image/registry.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package image
    16  
    17  import (
    18  	"fmt"
    19  	"strings"
    20  
    21  	"github.com/google/go-containerregistry/pkg/authn"
    22  	"github.com/google/go-containerregistry/pkg/name"
    23  	"github.com/google/go-containerregistry/pkg/v1/remote"
    24  	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
    25  )
    26  
    27  // Exists returns true if the image in the argument exists in a container registry.
    28  // The argument must be a complete image name, e.g. "gcr.io/istio-release/pilot:1.20.0".
    29  // If the image does not exist, it returns false and an optional error message, for debug purposes.
    30  func Exists(image string) (bool, error) {
    31  	ref, err := name.ParseReference(image)
    32  	if err != nil {
    33  		return false, fmt.Errorf("parsing reference %q: %w", image, err)
    34  	}
    35  	_, err = remote.Get(ref, remote.WithAuthFromKeychain(authn.DefaultKeychain))
    36  	if err == nil {
    37  		// image exists
    38  		return true, nil
    39  	}
    40  	isUnknown := strings.Contains(err.Error(), string(transport.ManifestUnknownErrorCode))
    41  	if isUnknown {
    42  		// image does not exist
    43  		return false, nil
    44  	}
    45  	// Some other error
    46  	return false, err
    47  }