Tonis Tiigi
9894189361
Add oci-layout:// source and target support to imagetools create and inspect while keeping merge, filter, and referrer logic shared. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
61 lines
1.1 KiB
Go
61 lines
1.1 KiB
Go
package ocilayout
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import (
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"strings"
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"github.com/distribution/reference"
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digest "github.com/opencontainers/go-digest"
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)
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type Ref struct {
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Path string
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Tag string
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Digest digest.Digest
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}
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const prefix = "oci-layout://"
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func Parse(s string) (Ref, bool, error) {
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if !strings.HasPrefix(s, prefix) {
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return Ref{}, false, nil
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}
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localPath := strings.TrimPrefix(s, prefix)
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var out Ref
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if i := strings.LastIndex(localPath, "@"); i >= 0 {
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after := localPath[i+1:]
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if reference.DigestRegexp.MatchString(after) {
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dgst, err := digest.Parse(after)
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if err != nil {
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return Ref{}, true, err
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}
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localPath, out.Digest = localPath[:i], dgst
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}
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}
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if i := strings.LastIndex(localPath, ":"); i >= 0 {
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after := localPath[i+1:]
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if reference.TagRegexp.MatchString(after) {
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localPath, out.Tag = localPath[:i], after
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}
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}
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out.Path = localPath
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if out.Tag == "" && out.Digest == "" {
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out.Tag = "latest"
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}
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return out, true, nil
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}
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func (r Ref) String() string {
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s := prefix + r.Path
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if r.Tag != "" {
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return s + ":" + r.Tag
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}
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if r.Digest != "" {
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return s + "@" + r.Digest.String()
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}
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return s
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}
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