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image.go
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image.go
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package lib
import (
"context"
"io"
"strings"
"github.com/containers/image/v5/copy"
"github.com/containers/image/v5/docker"
"github.com/containers/image/v5/docker/daemon"
"github.com/containers/image/v5/oci/layout"
"github.com/containers/image/v5/signature"
"github.com/containers/image/v5/types"
ispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/umoci"
"github.com/pkg/errors"
)
var urlSchemes map[string]func(string) (types.ImageReference, error)
func RegisterURLScheme(scheme string, f func(string) (types.ImageReference, error)) {
urlSchemes[scheme] = f
}
func init() {
// These should only be things which have pure go dependencies. Things
// with additional C dependencies (e.g. containers/image/storage)
// should live in their own package, so people can choose to add those
// deps or not.
urlSchemes = map[string]func(string) (types.ImageReference, error){}
RegisterURLScheme("oci", layout.ParseReference)
RegisterURLScheme("docker", docker.ParseReference)
RegisterURLScheme("docker-daemon", daemon.ParseReference)
}
func localRefParser(ref string) (types.ImageReference, error) {
parts := strings.SplitN(ref, ":", 2)
if len(parts) != 2 {
return nil, errors.Errorf("bad image ref: %s", ref)
}
f, ok := urlSchemes[parts[0]]
if !ok {
return nil, errors.Errorf("unknown url scheme %s for %s", parts[0], ref)
}
return f(parts[1])
}
type ImageCopyOpts struct {
Src string
SrcUsername string
SrcPassword string
Dest string
DestUsername string
DestPassword string
ForceManifestType string
SrcSkipTLS bool
DestSkipTLS bool
Progress io.Writer
Context context.Context
}
func ImageCopy(opts ImageCopyOpts) error {
if opts.Context == nil {
opts.Context = context.Background()
}
srcRef, err := localRefParser(opts.Src)
if err != nil {
return err
}
destRef, err := localRefParser(opts.Dest)
if err != nil {
return err
}
policy, err := signature.NewPolicyContext(&signature.Policy{
Default: []signature.PolicyRequirement{
signature.NewPRInsecureAcceptAnything(),
},
})
if err != nil {
return err
}
args := ©.Options{
ReportWriter: opts.Progress,
RemoveSignatures: true,
}
args.SourceCtx = &types.SystemContext{}
if opts.SrcSkipTLS {
args.SourceCtx.DockerInsecureSkipTLSVerify = types.OptionalBoolTrue
args.SourceCtx.DockerDaemonInsecureSkipTLSVerify = true
}
if opts.SrcUsername != "" {
args.SourceCtx.DockerAuthConfig = &types.DockerAuthConfig{
Username: opts.SrcUsername,
Password: opts.SrcPassword,
}
}
args.DestinationCtx = &types.SystemContext{}
if opts.DestSkipTLS {
args.DestinationCtx.DockerInsecureSkipTLSVerify = types.OptionalBoolTrue
args.DestinationCtx.DockerDaemonInsecureSkipTLSVerify = true
}
if opts.DestUsername != "" {
args.DestinationCtx.DockerAuthConfig = &types.DockerAuthConfig{
Username: opts.DestUsername,
Password: opts.DestPassword,
}
}
args.SourceCtx.OCIAcceptUncompressedLayers = true
args.DestinationCtx.OCIAcceptUncompressedLayers = true
// Set ForceManifestMIMEType
// Supported manifest type :- https://github.com/containers/image/blob/master/manifest/manifest.go#L49
// ImageCopy caller should set correct manifest type at its end.
if opts.ForceManifestType != "" {
args.ForceManifestMIMEType = opts.ForceManifestType
}
_, err = copy.Image(opts.Context, policy, destRef, srcRef, args)
if err != nil {
return err
}
// containers/image OCI as of
// https://github.com/containers/image/commit/ca5fe04cb38a1f0e0b960e9388a3c6372efd215a
// no longer deletes the old manifest from the index when it is
// re-tagged, it just deletes the tag from the manifest and leaves the
// manifest in the index untagged.
//
// umoci as of
// https://github.com/opencontainers/umoci/commit/f5eda69b4f5a2e59773fd34ac0866a107a1dbb67
// no longer ignores manifests in the index without tags when figuring
// out what to GC.
//
// This means that when we do a copy and a subsequent GC with both deps
// newer than the above hashes, the subsequent GC wouldn't do anything.
//
// Let's fix this by just deleting anything from the OCI repo that
// doesn't have a valid tag after a copy.
if destRef.Transport().Name() == "oci" {
// oci:$path:$tag
parts := strings.SplitN(opts.Dest, ":", 3)
if len(parts) != 3 {
return errors.Errorf("un-parsable oci dest %s", opts.Dest)
}
oci, err := umoci.OpenLayout(parts[1])
if err != nil {
return err
}
defer oci.Close()
index, err := oci.GetIndex(opts.Context)
if err != nil {
return err
}
newIndex := []ispec.Descriptor{}
for _, desc := range index.Manifests {
name, ok := desc.Annotations[ispec.AnnotationRefName]
if !ok || name == "" {
continue
}
newIndex = append(newIndex, desc)
}
index.Manifests = newIndex
err = oci.PutIndex(opts.Context, index)
if err != nil {
return err
}
}
return nil
}