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Merge pull request containerd#8807 from ambarve/cimfs
Add support for cimfs snapshotter & differ
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| //go:build windows | ||
| // +build windows | ||
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| /* | ||
| Copyright The containerd Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
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| package windows | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
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| "github.com/Microsoft/hcsshim/pkg/cimfs" | ||
| "github.com/containerd/containerd/v2/archive" | ||
| "github.com/containerd/containerd/v2/content" | ||
| "github.com/containerd/containerd/v2/diff" | ||
| "github.com/containerd/containerd/v2/errdefs" | ||
| "github.com/containerd/containerd/v2/metadata" | ||
| "github.com/containerd/containerd/v2/mount" | ||
| "github.com/containerd/containerd/v2/platforms" | ||
| "github.com/containerd/containerd/v2/plugins" | ||
| "github.com/containerd/plugin" | ||
| "github.com/containerd/plugin/registry" | ||
| ocispec "github.com/opencontainers/image-spec/specs-go/v1" | ||
| ) | ||
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| func init() { | ||
| registry.Register(&plugin.Registration{ | ||
| Type: plugins.DiffPlugin, | ||
| ID: "cimfs", | ||
| Requires: []plugin.Type{ | ||
| plugins.MetadataPlugin, | ||
| }, | ||
| InitFn: func(ic *plugin.InitContext) (interface{}, error) { | ||
| md, err := ic.GetSingle(plugins.MetadataPlugin) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| if !cimfs.IsCimFSSupported() { | ||
| return nil, fmt.Errorf("host windows version doesn't support CimFS") | ||
| } | ||
| ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec()) | ||
| return NewCimDiff(md.(*metadata.DB).ContentStore()) | ||
| }, | ||
| }) | ||
| } | ||
|
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| // cimDiff does filesystem comparison and application | ||
| // for CimFS specific layer diffs. | ||
| type cimDiff struct { | ||
| store content.Store | ||
| } | ||
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| // NewCimDiff is the Windows cim container layer implementation | ||
| // for comparing and applying filesystem layers | ||
| func NewCimDiff(store content.Store) (CompareApplier, error) { | ||
| return cimDiff{ | ||
| store: store, | ||
| }, nil | ||
| } | ||
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| // Apply applies the content associated with the provided digests onto the | ||
| // provided mounts. Archive content will be extracted and decompressed if | ||
| // necessary. | ||
| func (c cimDiff) Apply(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount, opts ...diff.ApplyOpt) (d ocispec.Descriptor, err error) { | ||
| layer, parentLayerPaths, err := cimMountsToLayerAndParents(mounts) | ||
| if err != nil { | ||
| return emptyDesc, err | ||
| } | ||
| return applyDiffCommon(ctx, c.store, desc, layer, parentLayerPaths, archive.AsCimContainerLayer(), opts...) | ||
| } | ||
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| // Compare creates a diff between the given mounts and uploads the result | ||
| // to the content store. | ||
| func (c cimDiff) Compare(ctx context.Context, lower, upper []mount.Mount, opts ...diff.Opt) (d ocispec.Descriptor, err error) { | ||
| // support for generating layer diff of cimfs layers will be added later. | ||
| return emptyDesc, errdefs.ErrNotImplemented | ||
| } | ||
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| func cimMountsToLayerAndParents(mounts []mount.Mount) (string, []string, error) { | ||
| if len(mounts) != 1 { | ||
| return "", nil, fmt.Errorf("%w: number of mounts should always be 1 for Windows layers", errdefs.ErrInvalidArgument) | ||
| } | ||
| mnt := mounts[0] | ||
| if mnt.Type != "CimFS" { | ||
| // This is a special case error. When this is received the diff service | ||
| // will attempt the next differ in the chain. | ||
| return "", nil, errdefs.ErrNotImplemented | ||
| } | ||
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| parentLayerPaths, err := mnt.GetParentPaths() | ||
| if err != nil { | ||
| return "", nil, err | ||
| } | ||
|
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| return mnt.Source, parentLayerPaths, nil | ||
| } |
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