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rebaser.go
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rebaser.go
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package lifecycle
import (
"encoding/json"
"fmt"
"github.com/buildpacks/imgutil"
"github.com/pkg/errors"
)
type Rebaser struct {
Logger Logger
}
func (r *Rebaser) Rebase(
workingImage imgutil.Image,
newBaseImage imgutil.Image,
additionalNames []string,
) error {
var origMetadata LayersMetadataCompat
if err := DecodeLabel(workingImage, LayerMetadataLabel, &origMetadata); err != nil {
return errors.Wrap(err, "get image metadata")
}
workingStackID, err := workingImage.Label(StackIDLabel)
if err != nil {
return errors.Wrap(err, "get working image stack")
}
newBaseStackID, err := newBaseImage.Label(StackIDLabel)
if err != nil {
return errors.Wrap(err, "get new base image stack")
}
if workingStackID == "" {
return errors.New("stack not defined on working image")
}
if newBaseStackID == "" {
return errors.New("stack not defined on new base image")
}
if workingStackID != newBaseStackID {
return errors.New(fmt.Sprintf("incompatible stack: '%s' is not compatible with '%s'", newBaseStackID, workingStackID))
}
err = workingImage.Rebase(origMetadata.RunImage.TopLayer, newBaseImage)
if err != nil {
return errors.Wrap(err, "rebase working image")
}
origMetadata.RunImage.TopLayer, err = newBaseImage.TopLayer()
if err != nil {
return errors.Wrap(err, "get rebase run image top layer SHA")
}
identifier, err := newBaseImage.Identifier()
if err != nil {
return errors.Wrap(err, "get run image id or digest")
}
origMetadata.RunImage.Reference = identifier.String()
data, err := json.Marshal(origMetadata)
if err != nil {
return errors.Wrap(err, "marshall metadata")
}
if err := workingImage.SetLabel(LayerMetadataLabel, string(data)); err != nil {
return errors.Wrap(err, "set app image metadata label")
}
return saveImage(workingImage, additionalNames, r.Logger)
}