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// Copyright 2023 Sylabs Inc. All rights reserved.
//
// SPDX-License-Identifier: Apache-2.0
package mutate
import (
"errors"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
)
type Mutation func(*image) error
var errInvalidLayerIndex = errors.New("invalid layer index")
// SetLayer sets the layer at index i to l.
func SetLayer(i int, l v1.Layer) Mutation {
return func(img *image) error {
if i >= len(img.overrides) {
return errInvalidLayerIndex
}
img.overrides[i] = l
return nil
}
}
// ReplaceLayers replaces all layers in the image with l. The layer is annotated with the specified
// values.
func ReplaceLayers(l v1.Layer) Mutation {
return func(img *image) error {
img.overrides = []v1.Layer{l}
return nil
}
}
// SetHistory replaces the history in an image with the specified entry.
func SetHistory(history v1.History) Mutation {
return func(img *image) error {
img.history = &history
return nil
}
}
// SetConfig replaces the config with the specified raw content of type t.
func SetConfig(configFile any, configType types.MediaType) Mutation {
return func(img *image) error {
img.configFileOverride = configFile
img.configTypeOverride = configType
return nil
}
}
// Apply performs the specified mutation(s) to a base image, returning the resulting image.
func Apply(base v1.Image, ms ...Mutation) (v1.Image, error) {
if len(ms) == 0 {
return base, nil
}
layers, err := base.Layers()
if err != nil {
return nil, err
}
img := image{
base: base,
overrides: make([]v1.Layer, len(layers)),
}
for _, m := range ms {
if err := m(&img); err != nil {
return nil, err
}
}
return &img, nil
}
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