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oras.go
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oras.go
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// Copyright (c) 2020, Control Command Inc. All rights reserved.
// Copyright (c) 2020-2023, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package oras
import (
"context"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"os"
"strings"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/name"
ggcrv1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/layout"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/sylabs/singularity/v4/internal/pkg/client/progress"
"github.com/sylabs/singularity/v4/internal/pkg/remote/credential/ociauth"
"github.com/sylabs/singularity/v4/pkg/image"
"github.com/sylabs/singularity/v4/pkg/sylog"
useragent "github.com/sylabs/singularity/v4/pkg/util/user-agent"
"golang.org/x/term"
)
// DownloadImage downloads a SIF image specified by an oci reference to a file using the included credentials
func DownloadImage(ctx context.Context, path, ref string, ociAuth *authn.AuthConfig, reqAuthFile string) error {
rt := progress.NewRoundTripper(ctx, nil)
im, err := remoteImage(ctx, ref, ociAuth, reqAuthFile, rt)
if err != nil {
rt.ProgressShutdown()
return err
}
// Check manifest to ensure we have a SIF as single layer
//
// We *don't* check the image config mediaType as prior versions of
// Singularity have not been consistent in setting this, and really all we
// care about is that we are pulling a single SIF file.
//
manifest, err := im.Manifest()
if err != nil {
rt.ProgressShutdown()
return err
}
if len(manifest.Layers) != 1 {
return fmt.Errorf("ORAS SIF image should have a single layer, found %d", len(manifest.Layers))
}
layer := manifest.Layers[0]
if layer.MediaType != SifLayerMediaTypeV1 &&
layer.MediaType != SifLayerMediaTypeProto {
rt.ProgressShutdown()
return fmt.Errorf("invalid layer mediatype: %s", layer.MediaType)
}
// Retrieve image to a temporary OCI layout
tmpDir, err := os.MkdirTemp("", "oras-tmp-")
if err != nil {
rt.ProgressShutdown()
return err
}
defer func() {
if err := os.RemoveAll(tmpDir); err != nil {
sylog.Errorf("while removing %q: %v", tmpDir, err)
}
}()
tmpLayout, err := layout.Write(tmpDir, empty.Index)
if err != nil {
rt.ProgressShutdown()
return err
}
if err := tmpLayout.AppendImage(im); err != nil {
rt.ProgressShutdown()
return err
}
rt.ProgressComplete()
rt.ProgressWait()
// Copy SIF blob out from layout to final location
blob, err := tmpLayout.Blob(layer.Digest)
if err != nil {
return err
}
defer blob.Close()
outFile, err := os.Create(path)
if err != nil {
return err
}
defer outFile.Close()
_, err = io.Copy(outFile, blob)
if err != nil {
return err
}
// Ensure that we have downloaded a SIF
if err := ensureSIF(path); err != nil {
// remove whatever we downloaded if it is not a SIF
os.RemoveAll(path)
return err
}
return nil
}
// UploadImage uploads the image specified by path and pushes it to the provided oci reference,
// it will use credentials if supplied
func UploadImage(ctx context.Context, path, ref string, ociAuth *authn.AuthConfig, reqAuthFile string) error {
// ensure that are uploading a SIF
if err := ensureSIF(path); err != nil {
return err
}
ref = strings.TrimPrefix(ref, "oras://")
ref = strings.TrimPrefix(ref, "//")
// Get reference to image in the remote
ir, err := name.ParseReference(ref,
name.WithDefaultTag(name.DefaultTag),
name.WithDefaultRegistry(name.DefaultRegistry),
)
if err != nil {
return err
}
im, err := NewImageFromSIF(path, SifLayerMediaTypeV1)
if err != nil {
return err
}
remoteOpts := []remote.Option{
ociauth.AuthOptn(ociAuth, reqAuthFile),
remote.WithUserAgent(useragent.Value()),
remote.WithContext(ctx),
}
if term.IsTerminal(2) {
pb := &progress.DownloadBar{}
progChan := make(chan ggcrv1.Update, 1)
go func() {
var total int64
soFar := int64(0)
for {
// The following is concurrency-safe because this is the only
// goroutine that's going to be reading progChan updates.
update := <-progChan
if update.Error != nil {
pb.Abort(false)
return
}
if update.Total != total {
pb.Init(update.Total)
total = update.Total
}
pb.IncrBy(int(update.Complete - soFar))
soFar = update.Complete
if soFar >= total {
pb.Wait()
return
}
}
}()
remoteOpts = append(remoteOpts, remote.WithProgress(progChan))
}
return remote.Write(ir, im, remoteOpts...)
}
// ensureSIF checks for a SIF image at filepath and returns an error if it is not, or an error is encountered
func ensureSIF(filepath string) error {
img, err := image.Init(filepath, false)
if err != nil {
return fmt.Errorf("could not open image %s for verification: %s", filepath, err)
}
defer img.File.Close()
if img.Type != image.SIF && img.Type != image.OCISIF {
return fmt.Errorf("%q is not a SIF", filepath)
}
return nil
}
// RefHash returns the digest of the SIF layer of the OCI manifest for supplied ref
func RefHash(ctx context.Context, ref string, ociAuth *authn.AuthConfig, reqAuthFile string) (ggcrv1.Hash, error) {
im, err := remoteImage(ctx, ref, ociAuth, reqAuthFile, nil)
if err != nil {
return ggcrv1.Hash{}, err
}
// Check manifest to ensure we have a SIF as single layer
manifest, err := im.Manifest()
if err != nil {
return ggcrv1.Hash{}, err
}
if len(manifest.Layers) != 1 {
return ggcrv1.Hash{}, fmt.Errorf("ORAS SIF image should have a single layer, found %d", len(manifest.Layers))
}
layer := manifest.Layers[0]
if layer.MediaType != SifLayerMediaTypeV1 &&
layer.MediaType != SifLayerMediaTypeProto {
return ggcrv1.Hash{}, fmt.Errorf("invalid layer mediatype: %s", layer.MediaType)
}
hash := layer.Digest
return hash, nil
}
// ImageDigest returns the digest for a file
func ImageHash(filePath string) (ggcrv1.Hash, error) {
file, err := os.Open(filePath)
if err != nil {
return ggcrv1.Hash{}, err
}
defer file.Close()
sha, _, err := sha256sum(file)
if err != nil {
return ggcrv1.Hash{}, err
}
hash, err := ggcrv1.NewHash(sha)
if err != nil {
return ggcrv1.Hash{}, err
}
return hash, nil
}
// sha256sum computes the sha256sum of the specified reader; caller is
// responsible for resetting file pointer. 'nBytes' indicates number of
// bytes read from reader
func sha256sum(r io.Reader) (result string, nBytes int64, err error) {
hash := sha256.New()
nBytes, err = io.Copy(hash, r)
if err != nil {
return "", 0, err
}
return "sha256:" + hex.EncodeToString(hash.Sum(nil)), nBytes, nil
}
// remoteImage returns a v1.Image for the provided remote ref.
func remoteImage(ctx context.Context, ref string, ociAuth *authn.AuthConfig, reqAuthFile string, rt *progress.RoundTripper) (ggcrv1.Image, error) {
ref = strings.TrimPrefix(ref, "oras://")
ref = strings.TrimPrefix(ref, "//")
// Get reference to image in the remote
ir, err := name.ParseReference(ref,
name.WithDefaultTag(name.DefaultTag),
name.WithDefaultRegistry(name.DefaultRegistry),
)
if err != nil {
return nil, fmt.Errorf("invalid reference %q: %w", ref, err)
}
remoteOpts := []remote.Option{
ociauth.AuthOptn(ociAuth, reqAuthFile),
remote.WithContext(ctx),
}
if rt != nil {
remoteOpts = append(remoteOpts, remote.WithTransport(rt))
}
im, err := remote.Image(ir, remoteOpts...)
if err != nil {
return nil, err
}
return im, nil
}