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109 lines
2.9 KiB
109 lines
2.9 KiB
1 year ago
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// Copyright 2018 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package remote
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import (
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"github.com/google/go-containerregistry/pkg/name"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/partial"
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)
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// MountableLayer wraps a v1.Layer in a shim that enables the layer to be
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// "mounted" when published to another registry.
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type MountableLayer struct {
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v1.Layer
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Reference name.Reference
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}
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// Descriptor retains the original descriptor from an image manifest.
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// See partial.Descriptor.
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func (ml *MountableLayer) Descriptor() (*v1.Descriptor, error) {
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return partial.Descriptor(ml.Layer)
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}
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// Exists is a hack. See partial.Exists.
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func (ml *MountableLayer) Exists() (bool, error) {
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return partial.Exists(ml.Layer)
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}
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// mountableImage wraps the v1.Layer references returned by the embedded v1.Image
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// in MountableLayer's so that remote.Write might attempt to mount them from their
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// source repository.
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type mountableImage struct {
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v1.Image
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Reference name.Reference
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}
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// Layers implements v1.Image
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func (mi *mountableImage) Layers() ([]v1.Layer, error) {
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ls, err := mi.Image.Layers()
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if err != nil {
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return nil, err
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}
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mls := make([]v1.Layer, 0, len(ls))
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for _, l := range ls {
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mls = append(mls, &MountableLayer{
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Layer: l,
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Reference: mi.Reference,
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})
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}
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return mls, nil
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}
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// LayerByDigest implements v1.Image
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func (mi *mountableImage) LayerByDigest(d v1.Hash) (v1.Layer, error) {
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l, err := mi.Image.LayerByDigest(d)
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if err != nil {
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return nil, err
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}
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return &MountableLayer{
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Layer: l,
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Reference: mi.Reference,
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}, nil
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}
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// LayerByDiffID implements v1.Image
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func (mi *mountableImage) LayerByDiffID(d v1.Hash) (v1.Layer, error) {
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l, err := mi.Image.LayerByDiffID(d)
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if err != nil {
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return nil, err
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}
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return &MountableLayer{
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Layer: l,
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Reference: mi.Reference,
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}, nil
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}
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// Descriptor retains the original descriptor from an index manifest.
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// See partial.Descriptor.
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func (mi *mountableImage) Descriptor() (*v1.Descriptor, error) {
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return partial.Descriptor(mi.Image)
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}
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// ConfigLayer retains the original reference so that it can be mounted.
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// See partial.ConfigLayer.
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func (mi *mountableImage) ConfigLayer() (v1.Layer, error) {
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l, err := partial.ConfigLayer(mi.Image)
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if err != nil {
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return nil, err
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}
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return &MountableLayer{
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Layer: l,
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Reference: mi.Reference,
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}, nil
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}
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