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Refactor differ into separate package

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Add differ options and package with interface.
Update optional values on diff interface to use options.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>
This commit is contained in:
Derek McGowan
2017-10-10 12:06:15 -07:00
parent 60960e1c17
commit d9db1d112d
14 changed files with 381 additions and 96 deletions
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11
rootfs/apply.go
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@@ -6,9 +6,9 @@ import (
"fmt"
"time"
"github.com/containerd/containerd/diff"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/snapshot"
"github.com/opencontainers/go-digest"
"github.com/opencontainers/image-spec/identity"
@@ -17,11 +17,6 @@ import (
"golang.org/x/net/context"
)
// Applier is used to apply a descriptor of a layer diff on top of mounts.
type Applier interface {
Apply(context.Context, ocispec.Descriptor, []mount.Mount) (ocispec.Descriptor, error)
}
// Layer represents the descriptors for a layer diff. These descriptions
// include the descriptor for the uncompressed tar diff as well as a blob
// used to transport that tar. The blob descriptor may or may not describe
@@ -35,7 +30,7 @@ type Layer struct {
// The returned result is a chain id digest representing all the applied layers.
// Layers are applied in order they are given, making the first layer the
// bottom-most layer in the layer chain.
func ApplyLayers(ctx context.Context, layers []Layer, sn snapshot.Snapshotter, a Applier) (digest.Digest, error) {
func ApplyLayers(ctx context.Context, layers []Layer, sn snapshot.Snapshotter, a diff.Differ) (digest.Digest, error) {
var chain []digest.Digest
for _, layer := range layers {
if _, err := ApplyLayer(ctx, layer, chain, sn, a); err != nil {
@@ -51,7 +46,7 @@ func ApplyLayers(ctx context.Context, layers []Layer, sn snapshot.Snapshotter, a
// ApplyLayer applies a single layer on top of the given provided layer chain,
// using the provided snapshotter and applier. If the layer was unpacked true
// is returned, if the layer already exists false is returned.
func ApplyLayer(ctx context.Context, layer Layer, chain []digest.Digest, sn snapshot.Snapshotter, a Applier) (bool, error) {
func ApplyLayer(ctx context.Context, layer Layer, chain []digest.Digest, sn snapshot.Snapshotter, a diff.Differ, opts ...snapshot.Opt) (bool, error) {
var (
parent = identity.ChainID(chain)
chainID = identity.ChainID(append(chain, layer.Diff.Digest))