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Update rootfs to use snapshot interface 

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan 2017-02-16 12:12:41 -08:00
parent bee5135047
commit b399634320
1 changed files with 5 additions and 11 deletions
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16
rootfs/apply.go
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@ -6,6 +6,7 @@ import (
"github.com/docker/containerd"
"github.com/docker/containerd/log"
"github.com/docker/containerd/snapshot"
"github.com/docker/docker/pkg/archive"
"github.com/opencontainers/go-digest"
"github.com/opencontainers/image-spec/identity"
@ -13,13 +14,6 @@ import (
"github.com/pkg/errors"
)
type Snapshotter interface {
Prepare(key, parent string) ([]containerd.Mount, error)
Commit(name, key string) error
Rollback(key string) error
Exists(name string) bool
}
type Mounter interface {
Mount(mounts ...containerd.Mount) error
Unmount(mounts ...containerd.Mount) error
@ -31,7 +25,7 @@ type Mounter interface {
// The parent *must* be the chainID of the parent layer.
//
// The returned digest is the diffID for the applied layer.
func ApplyLayer(snapshots Snapshotter, mounter Mounter, rd io.Reader, parent digest.Digest) (digest.Digest, error) {
func ApplyLayer(snapshots snapshot.Snapshotter, mounter Mounter, rd io.Reader, parent digest.Digest) (digest.Digest, error) {
digester := digest.Canonical.Digester() // used to calculate diffID.
rd = io.TeeReader(rd, digester.Hash())
@ -55,7 +49,7 @@ func ApplyLayer(snapshots Snapshotter, mounter Mounter, rd io.Reader, parent dig
}
if err := mounter.Mount(mounts...); err != nil {
if err := snapshots.Rollback(key); err != nil {
if err := snapshots.Remove(key); err != nil {
log.L.WithError(err).Error("snapshot rollback failed")
}
return "", err
@ -82,7 +76,7 @@ func ApplyLayer(snapshots Snapshotter, mounter Mounter, rd io.Reader, parent dig
//
// If successful, the chainID for the top-level layer is returned. That
// identifier can be used to check out a snapshot.
func Prepare(snapshots Snapshotter, mounter Mounter, layers []ocispec.Descriptor,
func Prepare(snapshots snapshot.Snapshotter, mounter Mounter, layers []ocispec.Descriptor,
// TODO(stevvooe): The following functions are candidate for internal
// object functions. We can use these to formulate the beginnings of a
// rootfs Controller.
@ -109,7 +103,7 @@ func Prepare(snapshots Snapshotter, mounter Mounter, layers []ocispec.Descriptor
chainLocal := append(chain, diffID)
chainID := identity.ChainID(chainLocal)
if snapshots.Exists(chainID.String()) {
if _, err := snapshots.Stat(chainID.String()); err == nil {
continue
}
}