d9db1d112d
Add differ options and package with interface. Update optional values on diff interface to use options. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package rootfs
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import (
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"fmt"
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"github.com/containerd/containerd/diff"
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"github.com/containerd/containerd/mount"
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"github.com/containerd/containerd/snapshot"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"golang.org/x/net/context"
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)
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// Diff creates a layer diff for the given snapshot identifier from the parent
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// of the snapshot. A content ref is provided to track the progress of the
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// 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 Diff(ctx context.Context, snapshotID string, sn snapshot.Snapshotter, d diff.Differ, 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", info.Parent)
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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 sn.Remove(ctx, lowerKey)
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var upper []mount.Mount
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if info.Kind == snapshot.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", snapshotID)
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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 sn.Remove(ctx, lowerKey)
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}
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return d.DiffMounts(ctx, lower, upper, opts...)
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}
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