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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.
*/
package diff
import (
"context"
"fmt"
diffapi "github.com/containerd/containerd/api/services/diff/v1"
"github.com/containerd/errdefs"
"github.com/containerd/errdefs/pkg/errgrpc"
"github.com/containerd/plugin"
"github.com/containerd/plugin/registry"
"github.com/containerd/typeurl/v2"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"google.golang.org/grpc"
"github.com/containerd/containerd/v2/core/diff"
"github.com/containerd/containerd/v2/core/mount"
"github.com/containerd/containerd/v2/pkg/oci"
"github.com/containerd/containerd/v2/plugins"
"github.com/containerd/containerd/v2/plugins/services"
)
type config struct {
// Order is the order of preference in which to try diff algorithms, the
// first differ which is supported is used.
// Note when multiple differs may be supported, this order will be
// respected for which is chosen. Each differ should return the same
// correct output, allowing any ordering to be used to prefer
// more optimimal implementations.
Order []string `toml:"default"`
// sync_fs is an experimental setting. It's to force sync
// filesystem during unpacking to ensure that data integrity.
// It is effective for all containerd client.
SyncFs bool `toml:"sync_fs"`
}
type differ interface {
diff.Comparer
diff.Applier
}
func init() {
registry.Register(&plugin.Registration{
Type: plugins.ServicePlugin,
ID: services.DiffService,
Requires: []plugin.Type{
plugins.DiffPlugin,
},
Config: defaultDifferConfig,
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
differs, err := ic.GetByType(plugins.DiffPlugin)
if err != nil {
return nil, err
}
syncFs := ic.Config.(*config).SyncFs
orderedNames := ic.Config.(*config).Order
ordered := make([]differ, len(orderedNames))
for i, n := range orderedNames {
d, ok := differs[n]
if !ok {
return nil, fmt.Errorf("needed differ not loaded: %s", n)
}
ordered[i], ok = d.(differ)
if !ok {
return nil, fmt.Errorf("differ does not implement Comparer and Applier interface: %s", n)
}
}
return &local{
differs: ordered,
syncfs: syncFs,
}, nil
},
})
}
type local struct {
differs []differ
syncfs bool
}
var _ diffapi.DiffClient = &local{}
func (l *local) Apply(ctx context.Context, er *diffapi.ApplyRequest, _ ...grpc.CallOption) (*diffapi.ApplyResponse, error) {
var (
ocidesc ocispec.Descriptor
err error
desc = oci.DescriptorFromProto(er.Diff)
mounts = mount.FromProto(er.Mounts)
)
var opts []diff.ApplyOpt
if er.Payloads != nil {
payloads := make(map[string]typeurl.Any)
for k, v := range er.Payloads {
payloads[k] = v
}
opts = append(opts, diff.WithPayloads(payloads))
}
if l.syncfs {
er.SyncFs = true
}
opts = append(opts, diff.WithSyncFs(er.SyncFs))
for _, differ := range l.differs {
ocidesc, err = differ.Apply(ctx, desc, mounts, opts...)
if !errdefs.IsNotImplemented(err) {
break
}
}
if err != nil {
return nil, errgrpc.ToGRPC(err)
}
return &diffapi.ApplyResponse{
Applied: oci.DescriptorToProto(ocidesc),
}, nil
}
func (l *local) Diff(ctx context.Context, dr *diffapi.DiffRequest, _ ...grpc.CallOption) (*diffapi.DiffResponse, error) {
var (
ocidesc ocispec.Descriptor
err error
aMounts = mount.FromProto(dr.Left)
bMounts = mount.FromProto(dr.Right)
)
var opts []diff.Opt
if dr.MediaType != "" {
opts = append(opts, diff.WithMediaType(dr.MediaType))
}
if dr.Ref != "" {
opts = append(opts, diff.WithReference(dr.Ref))
}
if dr.Labels != nil {
opts = append(opts, diff.WithLabels(dr.Labels))
}
if dr.SourceDateEpoch != nil {
tm := dr.SourceDateEpoch.AsTime()
opts = append(opts, diff.WithSourceDateEpoch(&tm))
}
for _, d := range l.differs {
ocidesc, err = d.Compare(ctx, aMounts, bMounts, opts...)
if !errdefs.IsNotImplemented(err) {
break
}
}
if err != nil {
return nil, errgrpc.ToGRPC(err)
}
return &diffapi.DiffResponse{
Diff: oci.DescriptorToProto(ocidesc),
}, nil
}
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