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differ: expose newWalkingDiff() for standalone buildkit

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Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2017-09-07 09:04:09 +00:00
parent d0457b2213
commit 1310c859c7
1 changed files with 9 additions and 2 deletions
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11
differ/differ.go
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@ -38,7 +38,7 @@ func init() {
if err != nil {
return nil, err
}
return newWalkingDiff(metadata.NewContentStore(md.(*bolt.DB), c.(content.Store)))
return NewWalkingDiff(metadata.NewContentStore(md.(*bolt.DB), c.(content.Store)))
},
})
}
@ -49,12 +49,17 @@ type walkingDiff struct {
var emptyDesc = ocispec.Descriptor{}
func newWalkingDiff(store content.Store) (plugin.Differ, error) {
// NewWalkingDiff is a generic implementation of plugin.Differ.
// NewWalkingDiff is expected to work with any filesystem.
func NewWalkingDiff(store content.Store) (plugin.Differ, error) {
return &walkingDiff{
store: store,
}, nil
}
// Apply applies the content associated with the provided digests onto the
// provided mounts. Archive content will be extracted and decompressed if
// necessary.
func (s *walkingDiff) Apply(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount) (ocispec.Descriptor, error) {
var isCompressed bool
switch desc.MediaType {
@ -118,6 +123,8 @@ func (s *walkingDiff) Apply(ctx context.Context, desc ocispec.Descriptor, mounts
}, nil
}
// DiffMounts creates a diff between the given mounts and uploads the result
// to the content store.
func (s *walkingDiff) DiffMounts(ctx context.Context, lower, upper []mount.Mount, media, ref string) (ocispec.Descriptor, error) {
var isCompressed bool
switch media {