mirror of https://github.com/containers/podman.git
105 lines
4.1 KiB
Go
105 lines
4.1 KiB
Go
package image
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import (
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"strings"
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"github.com/containers/image/v5/docker/reference"
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"github.com/pkg/errors"
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)
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// imageParts describes the parts of an image's name
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type imageParts struct {
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unnormalizedRef reference.Named // WARNING: Did not go through docker.io[/library] normalization
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hasRegistry bool
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}
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// Registries must contain a ":" or a "." or be localhost; this helper exists for users of reference.Parse.
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// For inputs that should use the docker.io[/library] normalization, use reference.ParseNormalizedNamed instead.
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func isRegistry(name string) bool {
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return strings.ContainsAny(name, ".:") || name == "localhost"
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}
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// GetImageBaseName uses decompose and string splits to obtain the base
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// name of an image. Doing this here because it beats changing the
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// imageParts struct names to be exported as well.
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func GetImageBaseName(input string) (string, error) {
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decomposedImage, err := decompose(input)
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if err != nil {
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return "", err
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}
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splitImageName := strings.Split(decomposedImage.unnormalizedRef.Name(), "/")
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return splitImageName[len(splitImageName)-1], nil
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}
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// decompose breaks an input name into an imageParts description
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func decompose(input string) (imageParts, error) {
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imgRef, err := reference.Parse(input)
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if err != nil {
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return imageParts{}, err
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}
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unnormalizedNamed := imgRef.(reference.Named)
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// ip.unnormalizedRef, because it uses reference.Parse and not reference.ParseNormalizedNamed,
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// does not use the standard heuristics for domains vs. namespaces/repos, so we need to check
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// explicitly.
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hasRegistry := isRegistry(reference.Domain(unnormalizedNamed))
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return imageParts{
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unnormalizedRef: unnormalizedNamed,
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hasRegistry: hasRegistry,
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}, nil
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}
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// suspiciousRefNameTagValuesForSearch returns a "tag" value used in a previous implementation.
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// This exists only to preserve existing behavior in heuristic code; it’s dubious that that behavior is correct,
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// especially for the tag value.
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func (ip *imageParts) suspiciousRefNameTagValuesForSearch() (string, string, string) {
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registry := reference.Domain(ip.unnormalizedRef)
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imageName := reference.Path(ip.unnormalizedRef)
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// ip.unnormalizedRef, because it uses reference.Parse and not reference.ParseNormalizedNamed,
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// does not use the standard heuristics for domains vs. namespaces/repos.
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if registry != "" && !isRegistry(registry) {
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imageName = registry + "/" + imageName
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registry = ""
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}
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var tag string
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if tagged, isTagged := ip.unnormalizedRef.(reference.NamedTagged); isTagged {
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tag = tagged.Tag()
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} else if _, hasDigest := ip.unnormalizedRef.(reference.Digested); hasDigest {
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tag = "none"
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} else {
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tag = LatestTag
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}
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return registry, imageName, tag
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}
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// referenceWithRegistry returns a (normalized) reference.Named composed of ip (with !ip.hasRegistry)
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// qualified with registry.
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func (ip *imageParts) referenceWithRegistry(registry string) (reference.Named, error) {
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if ip.hasRegistry {
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return nil, errors.Errorf("internal error: referenceWithRegistry called on imageParts with a registry (%#v)", *ip)
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}
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// We could build a reference.WithName+WithTag/WithDigest here, but we need to round-trip via a string
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// and a ParseNormalizedNamed anyway to get the right normalization of docker.io/library, so
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// just use a string directly.
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qualified := registry + "/" + ip.unnormalizedRef.String()
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ref, err := reference.ParseNormalizedNamed(qualified)
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if err != nil {
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return nil, errors.Wrapf(err, "error normalizing registry+unqualified reference %#v", qualified)
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}
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return ref, nil
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}
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// normalizedReference returns a (normalized) reference for ip (with ip.hasRegistry)
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func (ip *imageParts) normalizedReference() (reference.Named, error) {
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if !ip.hasRegistry {
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return nil, errors.Errorf("internal error: normalizedReference called on imageParts without a registry (%#v)", *ip)
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}
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// We need to round-trip via a string to get the right normalization of docker.io/library
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s := ip.unnormalizedRef.String()
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ref, err := reference.ParseNormalizedNamed(s)
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if err != nil { // Should never happen
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return nil, errors.Wrapf(err, "error normalizing qualified reference %#v", s)
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}
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return ref, nil
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}
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