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imageload.go
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imageload.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 docker
import (
"context"
"io"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/tarball"
"golang.org/x/exp/slices"
"namespacelabs.dev/foundation/internal/artifacts"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/ctxio"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/std/tasks"
)
func WriteImage(ctx context.Context, img v1.Image, ref name.Tag, ensureTag bool) error {
digest, err := img.Digest()
if err != nil {
return err
}
config, err := img.ConfigName()
if err != nil {
return err
}
return tasks.Action("docker.image-load").Arg("ref", ref.String()).Arg("digest", digest).Arg("config", config).Run(ctx, func(ctx context.Context) error {
return checkWriteImage(ctx, img, config, ref, ensureTag)
})
}
func checkWriteImage(ctx context.Context, img v1.Image, config v1.Hash, ref name.Tag, ensureTag bool) error {
client, err := NewClient()
if err != nil {
return err
}
if inspect, _, err := client.ImageInspectWithRaw(ctx, config.String()); err == nil {
if !ensureTag {
return nil
}
if slices.Contains(inspect.RepoTags, ref.String()) {
// Nothing to do.
return nil
}
if err := client.ImageTag(ctx, config.String(), ref.String()); err == nil {
tasks.Attachments(ctx).AddResult("tagged", true)
return nil
}
// If tagging fails, lets try to re-upload.
}
if _, err := writeImage(ctx, client, ref, img); err != nil {
return fnerrors.InvocationError("docker", "failed to write image: %w", err)
}
tasks.Attachments(ctx).AddResult("uploaded", true)
return nil
}
// Write saves the image into the daemon as the given tag.
func writeImage(ctx context.Context, client Client, tag name.Tag, img v1.Image) (string, error) {
pr, pw := io.Pipe()
go func() {
_ = pw.CloseWithError(tarball.Write(tag, img, ctxio.WriterWithContext(ctx, pw, nil)))
}()
progressReader := artifacts.NewProgressReader(pr, 0)
tasks.Attachments(ctx).SetProgress(progressReader)
// write the image in docker save format first, then load it
resp, err := client.ImageLoad(ctx, progressReader, false)
if err != nil {
return "", fnerrors.InvocationError("docker", "failed to load image: %w", err)
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
response := string(b)
if err != nil {
return response, fnerrors.InvocationError("docker", "error reading load response body: %w", err)
}
return response, nil
}
func writeImageOnce(name string, img v1.Image) (compute.Computable[v1.Hash], error) {
digest, err := img.Digest()
if err != nil {
return nil, fnerrors.InternalError("docker: failed to compute image digest: %w", err)
}
config, err := img.ConfigName()
if err != nil {
return nil, fnerrors.InternalError("docker: failed to fetch image config: %w", err)
}
if name == "" {
name = "foundation.namespacelabs.dev/docker-invocation"
}
return &writeImageOnceImpl{imageName: name, image: img, digest: digest, config: config}, nil
}
type writeImageOnceImpl struct {
imageName string
image v1.Image
digest, config v1.Hash
compute.DoScoped[v1.Hash]
}
var _ compute.Computable[v1.Hash] = &writeImageOnceImpl{}
func (w *writeImageOnceImpl) Action() *tasks.ActionEvent {
return tasks.Action("docker.image-load").Arg("ref", w.imageName).Arg("digest", w.digest).Arg("config", w.config)
}
func (w *writeImageOnceImpl) Inputs() *compute.In {
return compute.Inputs().Str("imageName", w.imageName).JSON("digest", w.digest)
}
func (w *writeImageOnceImpl) Compute(ctx context.Context, _ compute.Resolved) (v1.Hash, error) {
tag, err := name.NewTag(w.imageName, name.WithDefaultTag("local"))
if err != nil {
return v1.Hash{}, err
}
if err := checkWriteImage(ctx, w.image, w.config, tag, false); err != nil {
return v1.Hash{}, err
}
return w.config, nil
}