68 lines
2.2 KiB
Go
68 lines
2.2 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 rootfs
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import (
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"context"
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"fmt"
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"github.com/containerd/containerd/v2/core/diff"
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"github.com/containerd/containerd/v2/core/mount"
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"github.com/containerd/containerd/v2/core/snapshots"
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"github.com/containerd/containerd/v2/pkg/cleanup"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// CreateDiff creates a layer diff for the given snapshot identifier from the
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// parent of the snapshot. A content ref is provided to track the progress of
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// the content creation and the provided snapshotter and mount differ are used
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// for calculating the diff. The descriptor for the layer diff is returned.
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func CreateDiff(ctx context.Context, snapshotID string, sn snapshots.Snapshotter, d diff.Comparer, opts ...diff.Opt) (ocispec.Descriptor, error) {
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info, err := sn.Stat(ctx, snapshotID)
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if err != nil {
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return ocispec.Descriptor{}, err
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}
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lowerKey := fmt.Sprintf("%s-parent-view-%s", info.Parent, uniquePart())
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lower, err := sn.View(ctx, lowerKey, info.Parent)
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if err != nil {
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return ocispec.Descriptor{}, err
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}
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defer cleanup.Do(ctx, func(ctx context.Context) {
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sn.Remove(ctx, lowerKey)
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})
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var upper []mount.Mount
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if info.Kind == snapshots.KindActive {
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upper, err = sn.Mounts(ctx, snapshotID)
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if err != nil {
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return ocispec.Descriptor{}, err
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}
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} else {
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upperKey := fmt.Sprintf("%s-view-%s", snapshotID, uniquePart())
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upper, err = sn.View(ctx, upperKey, snapshotID)
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if err != nil {
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return ocispec.Descriptor{}, err
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}
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defer cleanup.Do(ctx, func(ctx context.Context) {
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sn.Remove(ctx, upperKey)
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})
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}
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return d.Compare(ctx, lower, upper, opts...)
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}
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