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layers.go
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layers.go
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package dist
import (
"os"
"path/filepath"
"github.com/buildpacks/lifecycle/api"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/tarball"
"github.com/pkg/errors"
)
type Descriptor interface {
API() *api.Version
Info() ModuleInfo
Order() Order
Stacks() []Stack
Targets() []Target
}
func LayerDiffID(layerTarPath string) (v1.Hash, error) {
fh, err := os.Open(filepath.Clean(layerTarPath))
if err != nil {
return v1.Hash{}, errors.Wrap(err, "opening tar file")
}
defer fh.Close()
layer, err := tarball.LayerFromFile(layerTarPath)
if err != nil {
return v1.Hash{}, errors.Wrap(err, "reading layer tar")
}
hash, err := layer.DiffID()
if err != nil {
return v1.Hash{}, errors.Wrap(err, "generating diff id")
}
return hash, nil
}
func AddToLayersMD(layerMD ModuleLayers, descriptor Descriptor, diffID string) {
info := descriptor.Info()
if _, ok := layerMD[info.ID]; !ok {
layerMD[info.ID] = map[string]ModuleLayerInfo{}
}
layerMD[info.ID][info.Version] = ModuleLayerInfo{
API: descriptor.API(),
Stacks: descriptor.Stacks(),
Targets: descriptor.Targets(),
Order: descriptor.Order(),
LayerDiffID: diffID,
Homepage: info.Homepage,
Name: info.Name,
}
}