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fetchimage.go
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fetchimage.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 (
"bytes"
"context"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/google/go-containerregistry/pkg/v1/types"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/compute/cache"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/parsing/devhost"
"namespacelabs.dev/foundation/std/tasks"
)
func ResolveImage(ref string, platform specs.Platform) NamedImage {
return MakeNamedImage(ref, ImageP(ref, &platform, ResolveOpts{}))
}
// Returns a Computable which constraints on platform if one is specified.
func ImageP(ref string, platform *specs.Platform, opts ResolveOpts) compute.Computable[Image] {
imageID := ResolveDigest(ref, opts)
return &fetchImage{
imageid: imageID,
descriptor: &fetchDescriptor{imageID: imageID, opts: opts},
platform: platform,
}
}
func toV1Plat(p *specs.Platform) *v1.Platform {
if p == nil {
return nil
}
return &v1.Platform{
OS: p.OS,
Architecture: p.Architecture,
// XXX handle variant.
}
}
type fetchImage struct {
imageid NamedImageID
descriptor compute.Computable[*RawDescriptor]
platform *specs.Platform
opts ResolveOpts // Does not affect output.
compute.DoScoped[Image] // Need long-lived ctx, as it's captured to fetch Layers.
}
func (r *fetchImage) Action() *tasks.ActionEvent {
action := tasks.Action("oci.pull-image")
if r.platform != nil {
action = action.Arg("platform", devhost.FormatPlatform(*r.platform))
}
return action
}
func (r *fetchImage) Inputs() *compute.In {
return compute.Inputs().
JSON("platform", r.platform).
Computable("descriptor", r.descriptor).
Computable("imageid", r.imageid.ImageID())
}
func (r *fetchImage) Compute(ctx context.Context, deps compute.Resolved) (Image, error) {
descriptor := compute.MustGetDepValue(deps, r.descriptor, "descriptor")
imageid := compute.MustGetDepValue(deps, r.imageid.ImageID(), "imageid")
tasks.Attachments(ctx).AddResult("repository", imageid.Repository)
tasks.Attachments(ctx).AddResult("digest", imageid.Digest)
switch {
case isIndexMediaType(types.MediaType(descriptor.MediaType)):
idx, err := v1.ParseIndexManifest(bytes.NewReader(descriptor.RawManifest))
if err != nil {
return nil, fnerrors.BadInputError("expected to parse an image index: %w", err)
}
tasks.Attachments(ctx).AddResult("index", true)
return imageForPlatform(idx, r.platform, func(h v1.Hash) (Image, error) {
return cacheAndReturn(ctx, ImageID{Repository: descriptor.Repository, Digest: h.String()}, r.opts)
})
case isImageMediaType(types.MediaType(descriptor.MediaType)):
return cacheAndReturn(ctx, imageid, r.opts)
}
return nil, fnerrors.BadInputError("unexpected media type: %s (expected image or image index)", descriptor.MediaType)
}
func cacheAndReturn(ctx context.Context, d ImageID, opts ResolveOpts) (Image, error) {
h, err := v1.NewHash(d.Digest)
if err != nil {
return nil, fnerrors.InternalError("failed to parse digest: %w", err)
}
img, err := lazyLoadFromCache(ctx, compute.Cache(ctx), h)
if err != nil {
return nil, err
}
if img != nil {
return img, nil
}
fetched, err := fetchRemoteImage(ctx, d, opts)
if err != nil {
return nil, err
}
if cache.IsDisabled(compute.Cache(ctx)) {
return fetched, nil
}
// We force a write, to ensure that all remote bytes have been loaded before
// returning. This both means that we know that the image has been fully
// loaded, but also that the load is done when the context is still alive.
//
// NOTE: writeImage will attach a progress to the parent action.
if err := writeImage(ctx, compute.Cache(ctx), fetched); err != nil {
return nil, fnerrors.InternalError("failed to store image: %w", err)
}
return lazyLoadFromCache(ctx, compute.Cache(ctx), h)
}
func fetchRemoteImage(ctx context.Context, imageid ImageID, opts ResolveOpts) (Image, error) {
ref, remoteOpts, err := ParseRefAndKeychain(ctx, imageid.RepoAndDigest(), opts)
if err != nil {
return nil, fnerrors.InternalError("%s: failed to parse: %w", imageid.RepoAndDigest(), err)
}
img, err := remote.Image(ref, remoteOpts...)
if err != nil {
return nil, fnerrors.InvocationError("registry", "failed to fetch image: %w", err)
}
return img, nil
}
func fetchRemoteDescriptor(ctx context.Context, imageRef string, opts ResolveOpts) (*remote.Descriptor, error) {
ref, remoteOpts, err := ParseRefAndKeychain(ctx, imageRef, opts)
if err != nil {
return nil, err
}
return remote.Get(ref, remoteOpts...)
}
func ParseRef(imageRef string, insecure bool) (name.Reference, error) {
var nameOpts []name.Option
if insecure {
nameOpts = append(nameOpts, name.Insecure)
}
return name.ParseReference(imageRef, nameOpts...)
}
type fetchDescriptor struct {
imageID NamedImageID
opts ResolveOpts
compute.LocalScoped[*RawDescriptor]
}
func (r *fetchDescriptor) Inputs() *compute.In {
return compute.Inputs().Computable("resolved", r.imageID.ImageID()).JSON("opts", r.opts)
}
func (r *fetchDescriptor) Action() *tasks.ActionEvent {
return tasks.Action("oci.fetch-descriptor").Arg("ref", r.imageID.Description())
}
func (r *fetchDescriptor) Compute(ctx context.Context, deps compute.Resolved) (*RawDescriptor, error) {
digest := compute.MustGetDepValue(deps, r.imageID.ImageID(), "resolved")
d, err := fetchRemoteDescriptor(ctx, digest.ImageRef(), r.opts)
if err != nil {
return nil, fnerrors.InvocationError("kubernetes", "failed to fetch descriptor: %w", err)
}
res := &RawDescriptor{
Repository: digest.Repository,
MediaType: string(d.MediaType),
RawManifest: d.Manifest,
}
// Also cache the config manifest, if this is an image.
if isImageMediaType(d.MediaType) {
img, err := d.Image()
if err != nil {
return nil, fnerrors.BadDataError("expected an image: %w", err)
}
res.RawConfig, err = img.RawConfigFile()
if err != nil {
return nil, fnerrors.BadDataError("failed to fetch raw image config: %w", err)
}
}
return res, nil
}