github.com/containerd/nerdctl/v2@v2.0.0-beta.5.0.20240520001846-b5758f54fa28/pkg/platformutil/layers.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package platformutil
    18  
    19  import (
    20  	"context"
    21  
    22  	"github.com/containerd/containerd/content"
    23  	"github.com/containerd/containerd/images"
    24  	"github.com/containerd/platforms"
    25  	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
    26  )
    27  
    28  func LayerDescs(ctx context.Context, provider content.Provider, imageTarget ocispec.Descriptor, platform platforms.MatchComparer) ([]ocispec.Descriptor, error) {
    29  	var descs []ocispec.Descriptor
    30  	err := images.Walk(ctx, images.Handlers(images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
    31  		if images.IsLayerType(desc.MediaType) {
    32  			descs = append(descs, desc)
    33  		}
    34  		return nil, nil
    35  	}), images.FilterPlatforms(images.ChildrenHandler(provider), platform)), imageTarget)
    36  	return descs, err
    37  }