112 lines
3.6 KiB
Go
112 lines
3.6 KiB
Go
//go:build windows
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// +build windows
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package windows
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import (
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"context"
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"fmt"
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"github.com/Microsoft/hcsshim/pkg/cimfs"
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"github.com/containerd/containerd/v2/archive"
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"github.com/containerd/containerd/v2/core/content"
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"github.com/containerd/containerd/v2/diff"
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"github.com/containerd/containerd/v2/errdefs"
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"github.com/containerd/containerd/v2/metadata"
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"github.com/containerd/containerd/v2/mount"
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"github.com/containerd/containerd/v2/platforms"
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"github.com/containerd/containerd/v2/plugins"
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"github.com/containerd/plugin"
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"github.com/containerd/plugin/registry"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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func init() {
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registry.Register(&plugin.Registration{
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Type: plugins.DiffPlugin,
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ID: "cimfs",
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Requires: []plugin.Type{
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plugins.MetadataPlugin,
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},
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InitFn: func(ic *plugin.InitContext) (interface{}, error) {
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md, err := ic.GetSingle(plugins.MetadataPlugin)
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if err != nil {
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return nil, err
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}
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if !cimfs.IsCimFSSupported() {
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return nil, fmt.Errorf("host windows version doesn't support CimFS: %w", plugin.ErrSkipPlugin)
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}
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ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
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return NewCimDiff(md.(*metadata.DB).ContentStore())
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},
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})
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}
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// cimDiff does filesystem comparison and application
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// for CimFS specific layer diffs.
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type cimDiff struct {
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store content.Store
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}
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// NewCimDiff is the Windows cim container layer implementation
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// for comparing and applying filesystem layers
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func NewCimDiff(store content.Store) (CompareApplier, error) {
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return cimDiff{
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store: store,
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}, nil
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}
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// Apply applies the content associated with the provided digests onto the
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// provided mounts. Archive content will be extracted and decompressed if
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// necessary.
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func (c cimDiff) Apply(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount, opts ...diff.ApplyOpt) (d ocispec.Descriptor, err error) {
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layer, parentLayerPaths, err := cimMountsToLayerAndParents(mounts)
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if err != nil {
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return emptyDesc, err
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}
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return applyDiffCommon(ctx, c.store, desc, layer, parentLayerPaths, archive.AsCimContainerLayer(), opts...)
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}
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// Compare creates a diff between the given mounts and uploads the result
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// to the content store.
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func (c cimDiff) Compare(ctx context.Context, lower, upper []mount.Mount, opts ...diff.Opt) (d ocispec.Descriptor, err error) {
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// support for generating layer diff of cimfs layers will be added later.
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return emptyDesc, errdefs.ErrNotImplemented
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}
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func cimMountsToLayerAndParents(mounts []mount.Mount) (string, []string, error) {
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if len(mounts) != 1 {
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return "", nil, fmt.Errorf("%w: number of mounts should always be 1 for Windows layers", errdefs.ErrInvalidArgument)
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}
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mnt := mounts[0]
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if mnt.Type != "CimFS" {
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// This is a special case error. When this is received the diff service
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// will attempt the next differ in the chain.
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return "", nil, errdefs.ErrNotImplemented
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}
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parentLayerPaths, err := mnt.GetParentPaths()
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if err != nil {
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return "", nil, err
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}
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return mnt.Source, parentLayerPaths, nil
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}
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