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makeimage.go
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makeimage.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package oci
import (
"context"
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/std/tasks"
)
type ResourceDescription[V any] interface {
Description() string
}
type NamedImageID interface {
ResourceDescription[ImageID]
ImageID() compute.Computable[ImageID]
}
type NamedImage interface {
ResourceDescription[Image]
Image() compute.Computable[Image]
}
type NamedLayer interface {
ResourceDescription[Layer]
Layer() compute.Computable[Layer]
}
func MakeNamedImageID(description string, imageID compute.Computable[ImageID]) NamedImageID {
return namedImageID{description, imageID}
}
func MakeNamedImage(description string, image compute.Computable[Image]) NamedImage {
return namedImage{description, image}
}
func MakeNamedLayer(description string, layer compute.Computable[Layer]) NamedLayer {
return namedLayer{description, layer}
}
func MakeImageFromScratch(description string, layers ...NamedLayer) NamedImage {
return MakeImage(description, Scratch(), layers...)
}
func MakeImage(description string, base NamedImage, layers ...NamedLayer) NamedImage {
return &makeImage{description: description, base: base, layers: layers}
}
type namedImageID struct {
description string
imageID compute.Computable[ImageID]
}
type namedImage struct {
description string
image compute.Computable[Image]
}
type namedLayer struct {
description string
layer compute.Computable[Layer]
}
func (x namedImageID) ImageID() compute.Computable[ImageID] { return x.imageID }
func (x namedImageID) Description() string { return x.description }
func (x namedImage) Image() compute.Computable[Image] { return x.image }
func (x namedImage) Description() string { return x.description }
func (x namedLayer) Layer() compute.Computable[Layer] { return x.layer }
func (x namedLayer) Description() string { return x.description }
type makeImage struct {
base NamedImage
layers []NamedLayer
description string // Does not affect output.
compute.LocalScoped[Image]
}
func (al *makeImage) Action() *tasks.ActionEvent {
var descs []string
for _, layer := range al.layers {
if l := layer.Layer(); l != nil {
descs = append(descs, layer.Description())
}
}
return tasks.Action("oci.make-image").Arg("base", al.base.Description()).Arg("layers", descs)
}
func (al *makeImage) Inputs() *compute.In {
in := compute.Inputs().Computable("base", al.base.Image())
for k, layer := range al.layers {
if l := layer.Layer(); l != nil {
in = in.Computable(fmt.Sprintf("layer%d", k), l)
}
}
return in
}
func (al *makeImage) Compute(ctx context.Context, deps compute.Resolved) (Image, error) {
base := compute.MustGetDepValue(deps, al.base.Image(), "base")
var layers []v1.Layer
for k, layer := range al.layers {
l, ok := compute.GetDep(deps, layer.Layer(), fmt.Sprintf("layer%d", k))
if ok {
layers = append(layers, l.Value)
}
}
image, err := mutate.AppendLayers(base, layers...)
if err != nil {
return nil, fnerrors.InternalError("failed to create image: %w", err)
}
// The Digest() is requested here to guarantee that the image can indeed be created.
// This will also mark the digest "computed", which is the closest we can get to a
// sealed result.
if _, err := image.Digest(); err != nil {
return nil, fnerrors.InternalError("failed to compute image digest: %w", err)
}
return image, nil
}
func (al *makeImage) Image() compute.Computable[Image] { return al }
func (al *makeImage) Description() string { return al.description }