110 lines
2.9 KiB
Go
110 lines
2.9 KiB
Go
/*
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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 containerd
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import (
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"context"
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diffapi "github.com/containerd/containerd/api/services/diff/v1"
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"github.com/containerd/containerd/api/types"
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"github.com/containerd/containerd/diff"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/mount"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// DiffService handles the computation and application of diffs
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type DiffService interface {
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diff.Comparer
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diff.Applier
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}
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// NewDiffServiceFromClient returns a new diff service which communicates
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// over a GRPC connection.
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func NewDiffServiceFromClient(client diffapi.DiffClient) DiffService {
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return &diffRemote{
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client: client,
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}
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}
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type diffRemote struct {
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client diffapi.DiffClient
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}
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func (r *diffRemote) Apply(ctx context.Context, diff ocispec.Descriptor, mounts []mount.Mount) (ocispec.Descriptor, error) {
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req := &diffapi.ApplyRequest{
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Diff: fromDescriptor(diff),
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Mounts: fromMounts(mounts),
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}
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resp, err := r.client.Apply(ctx, req)
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if err != nil {
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return ocispec.Descriptor{}, errdefs.FromGRPC(err)
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}
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return toDescriptor(resp.Applied), nil
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}
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func (r *diffRemote) Compare(ctx context.Context, a, b []mount.Mount, opts ...diff.Opt) (ocispec.Descriptor, error) {
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var config diff.Config
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for _, opt := range opts {
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if err := opt(&config); err != nil {
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return ocispec.Descriptor{}, err
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}
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}
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req := &diffapi.DiffRequest{
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Left: fromMounts(a),
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Right: fromMounts(b),
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MediaType: config.MediaType,
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Ref: config.Reference,
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Labels: config.Labels,
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}
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resp, err := r.client.Diff(ctx, req)
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if err != nil {
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return ocispec.Descriptor{}, errdefs.FromGRPC(err)
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}
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return toDescriptor(resp.Diff), nil
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}
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func toDescriptor(d *types.Descriptor) ocispec.Descriptor {
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return ocispec.Descriptor{
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MediaType: d.MediaType,
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Digest: d.Digest,
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Size: d.Size_,
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Annotations: d.Annotations,
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}
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}
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func fromDescriptor(d ocispec.Descriptor) *types.Descriptor {
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return &types.Descriptor{
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MediaType: d.MediaType,
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Digest: d.Digest,
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Size_: d.Size,
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Annotations: d.Annotations,
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}
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}
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func fromMounts(mounts []mount.Mount) []*types.Mount {
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apiMounts := make([]*types.Mount, len(mounts))
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for i, m := range mounts {
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apiMounts[i] = &types.Mount{
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Type: m.Type,
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Source: m.Source,
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Options: m.Options,
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}
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}
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return apiMounts
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}
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