da34812db6
Differ is updated to set a label for the uncompressed hash of compressed content. This allows compressed blobs to be used and looked up for their uncompressed hashes. Uses commit options to set labels. Updates rootfs default to create compressed archives. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
54 lines
1.8 KiB
Go
54 lines
1.8 KiB
Go
package rootfs
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import (
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"fmt"
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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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// MountDiffer computes the difference between two mounts and returns a
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// descriptor for the computed diff. The provided ref can be used to track
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// the content creation of the diff and media type is used to determine the
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// format of the created content.
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type MountDiffer interface {
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DiffMounts(ctx context.Context, lower, upper []mount.Mount, media, ref string) (ocispec.Descriptor, error)
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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, contentRef string, sn snapshot.Snapshotter, md MountDiffer) (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 md.DiffMounts(ctx, lower, upper, ocispec.MediaTypeImageLayerGzip, contentRef)
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}
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