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package image
import (
"fmt"
"io"
"os"
"strings"
cp "github.com/containers/image/copy"
"github.com/containers/image/directory"
"github.com/containers/image/docker"
dockerarchive "github.com/containers/image/docker/archive"
"github.com/containers/image/docker/tarfile"
ociarchive "github.com/containers/image/oci/archive"
"github.com/containers/image/pkg/sysregistries"
is "github.com/containers/image/storage"
"github.com/containers/image/tarball"
"github.com/containers/image/transports/alltransports"
"github.com/containers/image/types"
"github.com/pkg/errors"
)
var (
// DockerArchive is the transport we prepend to an image name
// when saving to docker-archive
DockerArchive = dockerarchive.Transport.Name()
// OCIArchive is the transport we prepend to an image name
// when saving to oci-archive
OCIArchive = ociarchive.Transport.Name()
// DirTransport is the transport for pushing and pulling
// images to and from a directory
DirTransport = directory.Transport.Name()
// TransportNames are the supported transports in string form
TransportNames = [...]string{DefaultTransport, DockerArchive, OCIArchive, "ostree:", "dir:"}
// TarballTransport is the transport for importing a tar archive
// and creating a filesystem image
TarballTransport = tarball.Transport.Name()
// DockerTransport is the transport for docker registries
DockerTransport = docker.Transport.Name() + "://"
// AtomicTransport is the transport for atomic registries
AtomicTransport = "atomic"
// DefaultTransport is a prefix that we apply to an image name
DefaultTransport = DockerTransport
)
type pullStruct struct {
image string
srcRef types.ImageReference
dstRef types.ImageReference
}
func (ir *Runtime) getPullStruct(srcRef types.ImageReference, destName string) (*pullStruct, error) {
reference := destName
if srcRef.DockerReference() != nil {
reference = srcRef.DockerReference().String()
}
destRef, err := is.Transport.ParseStoreReference(ir.store, reference)
if err != nil {
return nil, errors.Errorf("error parsing dest reference name: %v", err)
}
return &pullStruct{
image: destName,
srcRef: srcRef,
dstRef: destRef,
}, nil
}
// returns a list of pullStruct with the srcRef and DstRef based on the transport being used
func (ir *Runtime) getPullListFromRef(srcRef types.ImageReference, imgName string, sc *types.SystemContext) ([]*pullStruct, error) {
var pullStructs []*pullStruct
splitArr := strings.Split(imgName, ":")
archFile := splitArr[len(splitArr)-1]
// supports pulling from docker-archive, oci, and registries
if srcRef.Transport().Name() == DockerArchive {
tarSource, err := tarfile.NewSourceFromFile(archFile)
if err != nil {
return nil, err
}
manifest, err := tarSource.LoadTarManifest()
if err != nil {
return nil, 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
reference, err := getImageDigest(srcRef, sc)
if err != nil {
return nil, err
}
pullInfo, err := ir.getPullStruct(srcRef, reference)
if err != nil {
return nil, err
}
pullStructs = append(pullStructs, pullInfo)
} else {
var dest string
if len(manifest[0].RepoTags) > 0 {
dest = manifest[0].RepoTags[0]
} else {
// If the input image has no repotags, we need to feed it a dest anyways
dest, err = getImageDigest(srcRef, sc)
if err != nil {
return nil, err
}
}
pullInfo, err := ir.getPullStruct(srcRef, dest)
if err != nil {
return nil, err
}
pullStructs = append(pullStructs, pullInfo)
}
} else if srcRef.Transport().Name() == OCIArchive {
// retrieve the manifest from index.json to access the image name
manifest, err := ociarchive.LoadManifestDescriptor(srcRef)
if err != nil {
return nil, errors.Wrapf(err, "error loading manifest for %q", srcRef)
}
if manifest.Annotations == nil || manifest.Annotations["org.opencontainers.image.ref.name"] == "" {
return nil, errors.Errorf("error, archive doesn't have a name annotation. Cannot store image with no name")
}
pullInfo, err := ir.getPullStruct(srcRef, manifest.Annotations["org.opencontainers.image.ref.name"])
if err != nil {
return nil, err
}
pullStructs = append(pullStructs, pullInfo)
} else if srcRef.Transport().Name() == DirTransport {
// supports pull from a directory
image := splitArr[1]
// remove leading "/"
if image[:1] == "/" {
image = image[1:]
}
pullInfo, err := ir.getPullStruct(srcRef, image)
if err != nil {
return nil, err
}
pullStructs = append(pullStructs, pullInfo)
} else {
pullInfo, err := ir.getPullStruct(srcRef, imgName)
if err != nil {
return nil, err
}
pullStructs = append(pullStructs, pullInfo)
}
return pullStructs, nil
}
// pullImage pulls an image from configured registries
// By default, only the latest tag (or a specific tag if requested) will be
// pulled.
func (i *Image) pullImage(writer io.Writer, authfile, signaturePolicyPath string, signingOptions SigningOptions, dockerOptions *DockerRegistryOptions) (string, error) {
// pullImage copies the image from the source to the destination
var pullStructs []*pullStruct
sc := GetSystemContext(signaturePolicyPath, authfile, false)
srcRef, err := alltransports.ParseImageName(i.InputName)
if err != nil {
// could be trying to pull from registry with short name
pullStructs, err = i.createNamesToPull()
if err != nil {
return "", errors.Wrap(err, "error getting default registries to try")
}
} else {
pullStructs, err = i.imageruntime.getPullListFromRef(srcRef, i.InputName, sc)
if err != nil {
return "", errors.Wrapf(err, "error getting pullStruct info to pull image %q", i.InputName)
}
}
policyContext, err := getPolicyContext(sc)
if err != nil {
return "", err
}
defer policyContext.Destroy()
copyOptions := getCopyOptions(writer, signaturePolicyPath, dockerOptions, nil, signingOptions, authfile, "", false)
for _, imageInfo := range pullStructs {
// Print the following statement only when pulling from a docker or atomic registry
if writer != nil && (imageInfo.srcRef.Transport().Name() == DockerTransport || imageInfo.srcRef.Transport().Name() == AtomicTransport) {
io.WriteString(writer, fmt.Sprintf("Trying to pull %s...\n", imageInfo.image))
}
if err = cp.Image(policyContext, imageInfo.dstRef, imageInfo.srcRef, copyOptions); err != nil {
if writer != nil {
io.WriteString(writer, "Failed\n")
}
} else {
return imageInfo.image, nil
}
}
return "", errors.Wrapf(err, "error pulling image from")
}
// createNamesToPull looks at a decomposed image and determines the possible
// images names to try pulling in combination with the registries.conf file as well
func (i *Image) createNamesToPull() ([]*pullStruct, error) {
var pullNames []*pullStruct
decomposedImage, err := decompose(i.InputName)
if err != nil {
return nil, err
}
if decomposedImage.hasRegistry {
srcRef, err := alltransports.ParseImageName(decomposedImage.assembleWithTransport())
if err != nil {
return nil, errors.Errorf("unable to parse '%s'", i.InputName)
}
ps := pullStruct{
image: i.InputName,
srcRef: srcRef,
}
pullNames = append(pullNames, &ps)
} else {
registryConfigPath := ""
envOverride := os.Getenv("REGISTRIES_CONFIG_PATH")
if len(envOverride) > 0 {
registryConfigPath = envOverride
}
searchRegistries, err := sysregistries.GetRegistries(&types.SystemContext{SystemRegistriesConfPath: registryConfigPath})
if err != nil {
return nil, err
}
for _, registry := range searchRegistries {
decomposedImage.registry = registry
srcRef, err := alltransports.ParseImageName(decomposedImage.assembleWithTransport())
if err != nil {
return nil, errors.Errorf("unable to parse '%s'", i.InputName)
}
ps := pullStruct{
image: decomposedImage.assemble(),
srcRef: srcRef,
}
pullNames = append(pullNames, &ps)
}
}
for _, pStruct := range pullNames {
destRef, err := is.Transport.ParseStoreReference(i.imageruntime.store, pStruct.image)
if err != nil {
return nil, errors.Errorf("error parsing dest reference name: %v", err)
}
pStruct.dstRef = destRef
}
return pullNames, nil
}
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