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// Copyright (c) 2019-2023, 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 ociimage
import (
"fmt"
"strings"
"github.com/containers/image/v5/docker"
dockerarchive "github.com/containers/image/v5/docker/archive"
dockerdaemon "github.com/containers/image/v5/docker/daemon"
ociarchive "github.com/containers/image/v5/oci/archive"
ocilayout "github.com/containers/image/v5/oci/layout"
"github.com/containers/image/v5/signature"
"github.com/containers/image/v5/types"
)
// defaultPolicy is Singularity's default OCI signature verifiction policy - accept anything.
func defaultPolicy() (*signature.PolicyContext, error) {
policy := &signature.Policy{Default: []signature.PolicyRequirement{signature.NewPRInsecureAcceptAnything()}}
return signature.NewPolicyContext(policy)
}
// parseImageRef parses a uri-like OCI image reference into a containers/image types.ImageReference.
func ParseImageRef(imageRef string) (types.ImageReference, error) {
parts := strings.SplitN(imageRef, ":", 2)
if len(parts) < 2 {
return nil, fmt.Errorf("could not parse image ref: %s", imageRef)
}
var srcRef types.ImageReference
var err error
switch parts[0] {
case "docker":
srcRef, err = docker.ParseReference(parts[1])
case "docker-archive":
srcRef, err = dockerarchive.ParseReference(parts[1])
case "docker-daemon":
srcRef, err = dockerdaemon.ParseReference(parts[1])
case "oci":
srcRef, err = ocilayout.ParseReference(parts[1])
case "oci-archive":
srcRef, err = ociarchive.ParseReference(parts[1])
default:
return nil, fmt.Errorf("cannot create an OCI container from %s source", parts[0])
}
if err != nil {
return nil, fmt.Errorf("invalid image source: %v", err)
}
return srcRef, nil
}
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