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package buildah
import (
"context"
"io"
"strings"
cp "github.com/containers/image/copy"
"github.com/containers/image/docker/reference"
tarfile "github.com/containers/image/docker/tarfile"
ociarchive "github.com/containers/image/oci/archive"
"github.com/containers/image/pkg/sysregistries"
"github.com/containers/image/signature"
is "github.com/containers/image/storage"
"github.com/containers/image/transports"
"github.com/containers/image/transports/alltransports"
"github.com/containers/image/types"
"github.com/containers/storage"
"github.com/pkg/errors"
"github.com/projectatomic/buildah/util"
"github.com/sirupsen/logrus"
)
// PullOptions can be used to alter how an image is copied in from somewhere.
type PullOptions struct {
// SignaturePolicyPath specifies an override location for the signature
// policy which should be used for verifying the new image as it is
// being written. Except in specific circumstances, no value should be
// specified, indicating that the shared, system-wide default policy
// should be used.
SignaturePolicyPath string
// ReportWriter is an io.Writer which will be used to log the writing
// of the new image.
ReportWriter io.Writer
// Store is the local storage store which holds the source image.
Store storage.Store
// github.com/containers/image/types SystemContext to hold credentials
// and other authentication/authorization information.
SystemContext *types.SystemContext
// Transport is a value which is prepended to the image's name, if the
// image name alone can not be resolved to a reference to a source
// image. No separator is implicitly added.
Transport string
}
func localImageNameForReference(ctx context.Context, store storage.Store, srcRef types.ImageReference, spec string) (string, error) {
if srcRef == nil {
return "", errors.Errorf("reference to image is empty")
}
split := strings.SplitN(spec, ":", 2)
file := split[len(split)-1]
var name string
switch srcRef.Transport().Name() {
case util.DockerArchive:
tarSource, err := tarfile.NewSourceFromFile(file)
if err != nil {
return "", err
}
manifest, err := tarSource.LoadTarManifest()
if err != nil {
return "", errors.Errorf("error retrieving manifest.json: %v", err)
}
// to pull the first image stored in the tar file
if len(manifest) == 0 {
// use the hex of the digest if no manifest is found
name, err = getImageDigest(ctx, srcRef, nil)
if err != nil {
return "", err
}
} else {
if len(manifest[0].RepoTags) > 0 {
name = manifest[0].RepoTags[0]
} else {
// If the input image has no repotags, we need to feed it a dest anyways
name, err = getImageDigest(ctx, srcRef, nil)
if err != nil {
return "", err
}
}
}
case util.OCIArchive:
// retrieve the manifest from index.json to access the image name
manifest, err := ociarchive.LoadManifestDescriptor(srcRef)
if err != nil {
return "", errors.Wrapf(err, "error loading manifest for %q", srcRef)
}
// if index.json has no reference name, compute the image digest instead
if manifest.Annotations == nil || manifest.Annotations["org.opencontainers.image.ref.name"] == "" {
name, err = getImageDigest(ctx, srcRef, nil)
if err != nil {
return "", err
}
} else {
name = manifest.Annotations["org.opencontainers.image.ref.name"]
}
case util.DirTransport:
// supports pull from a directory
name = split[1]
// remove leading "/"
if name[:1] == "/" {
name = name[1:]
}
default:
ref := srcRef.DockerReference()
if ref == nil {
name = srcRef.StringWithinTransport()
_, err := is.Transport.ParseStoreReference(store, name)
if err == nil {
return name, nil
}
if strings.LastIndex(name, "/") != -1 {
name = name[strings.LastIndex(name, "/")+1:]
_, err = is.Transport.ParseStoreReference(store, name)
if err == nil {
return name, nil
}
}
return "", errors.Errorf("reference to image %q is not a named reference", transports.ImageName(srcRef))
}
if named, ok := ref.(reference.Named); ok {
name = named.Name()
if namedTagged, ok := ref.(reference.NamedTagged); ok {
name = name + ":" + namedTagged.Tag()
}
if canonical, ok := ref.(reference.Canonical); ok {
name = name + "@" + canonical.Digest().String()
}
}
}
if _, err := is.Transport.ParseStoreReference(store, name); err != nil {
return "", errors.Wrapf(err, "error parsing computed local image name %q", name)
}
return name, nil
}
// Pull copies the contents of the image from somewhere else.
func Pull(ctx context.Context, imageName string, options PullOptions) (types.ImageReference, error) {
systemContext := getSystemContext(options.SystemContext, options.SignaturePolicyPath)
return pullImage(ctx, options.Store, imageName, options, systemContext)
}
func pullImage(ctx context.Context, store storage.Store, imageName string, options PullOptions, sc *types.SystemContext) (types.ImageReference, error) {
spec := imageName
srcRef, err := alltransports.ParseImageName(spec)
if err != nil {
if options.Transport == "" {
return nil, errors.Wrapf(err, "error parsing image name %q", spec)
}
transport := options.Transport
if transport != DefaultTransport {
transport = transport + ":"
}
spec = transport + spec
srcRef2, err2 := alltransports.ParseImageName(spec)
if err2 != nil {
return nil, errors.Wrapf(err2, "error parsing image name %q", spec)
}
srcRef = srcRef2
}
destName, err := localImageNameForReference(ctx, store, srcRef, spec)
if err != nil {
return nil, errors.Wrapf(err, "error computing local image name for %q", transports.ImageName(srcRef))
}
if destName == "" {
return nil, errors.Errorf("error computing local image name for %q", transports.ImageName(srcRef))
}
destRef, err := is.Transport.ParseStoreReference(store, destName)
if err != nil {
return nil, errors.Wrapf(err, "error parsing image name %q", destName)
}
policy, err := signature.DefaultPolicy(sc)
if err != nil {
return nil, errors.Wrapf(err, "error obtaining default signature policy")
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return nil, errors.Wrapf(err, "error creating new signature policy context")
}
defer func() {
if err2 := policyContext.Destroy(); err2 != nil {
logrus.Debugf("error destroying signature policy context: %v", err2)
}
}()
logrus.Debugf("copying %q to %q", spec, destName)
pullError := cp.Image(ctx, policyContext, destRef, srcRef, getCopyOptions(options.ReportWriter, sc, nil, ""))
if pullError == nil {
return destRef, nil
}
// If no image was found, we should handle. Lets be nicer to the user and see if we can figure out why.
registryPath := sysregistries.RegistriesConfPath(sc)
searchRegistries, err := getRegistries(sc)
if err != nil {
return nil, err
}
hasRegistryInName, err := hasRegistry(imageName)
if err != nil {
return nil, err
}
if !hasRegistryInName && len(searchRegistries) == 0 {
return nil, errors.Errorf("image name provided is a short name and no search registries are defined in %s: %s", registryPath, pullError)
}
return nil, pullError
}
// getImageDigest creates an image object and uses the hex value of the digest as the image ID
// for parsing the store reference
func getImageDigest(ctx context.Context, src types.ImageReference, sc *types.SystemContext) (string, error) {
newImg, err := src.NewImage(ctx, sc)
if err != nil {
return "", err
}
defer newImg.Close()
digest := newImg.ConfigInfo().Digest
if err = digest.Validate(); err != nil {
return "", errors.Wrapf(err, "error getting config info")
}
return "@" + digest.Hex(), nil
}
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